技术领域Technical Field
本发明属于电力系统安全运行技术领域，尤其涉及一种高比例分布式电源接入的配电网短路故障检测方法及系统。The present invention belongs to the technical field of safe operation of electric power systems, and in particular relates to a method and system for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected thereto.
背景技术Background technique
随着高比例分布式电源系统的接入，传统配电网的运行方式发生了变化，对配电网的故障检测产生了重大影响。也使得针对传统配电网的故障检测方法不再适用于现有的网络。传统的故障识别多以稳态信号作为检测特征，一般故障，电压、电流等电气量在故障前后变化明显，故障检测可以通过识别这些稳态突变量来进行。With the access of a high proportion of distributed power systems, the operation mode of traditional distribution networks has changed, which has a significant impact on the fault detection of distribution networks. It also makes the fault detection method for traditional distribution networks no longer applicable to existing networks. Traditional fault identification mostly uses steady-state signals as detection features. For general faults, electrical quantities such as voltage and current change significantly before and after the fault. Fault detection can be performed by identifying these steady-state mutations.
但是高阻故障的故障电气量变化微弱，传统的保护装置难以检测，容易被漏判、错判，无法保证可靠性。亟需充分发掘在新型配电网下的故障特征，尤其是针对故障信号微弱不易检测的高阻接地故障进行特征提取与分析。However, the fault electrical quantity of high-resistance fault changes slightly, which is difficult to detect with traditional protection devices. It is easy to be missed or misjudged, and reliability cannot be guaranteed. It is urgent to fully explore the fault characteristics under the new distribution network, especially to extract and analyze the characteristics of high-resistance grounding faults with weak fault signals that are difficult to detect.
发明内容Summary of the invention
本发明提供一种高比例分布式电源接入的配电网短路故障检测方法及系统，用于解决无法在故障信号微弱不易检测的高阻接地故障中进行特征提取与分析的技术问题。The present invention provides a short-circuit fault detection method and system for a distribution network with a high proportion of distributed power sources connected, which is used to solve the technical problem that it is impossible to extract and analyze features in a high-resistance grounding fault with a weak fault signal that is difficult to detect.
第一方面，本发明提供一种高比例分布式电源接入的配电网短路故障检测方法，包括：In a first aspect, the present invention provides a method for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected, comprising:
采集分布式电源的接入点电压以及输出电流/>；Collect the voltage at the access point of distributed power supply And the output current/> ;
分别对所述接入点电压和所述输出电流/>进行快速傅里叶分解，得到所述接入点电压/>和所述输出电流/>在各个谐波频率处的谐波幅值，并通过欧姆定律计算各个谐波频率处的虚拟阻抗值；The access point voltage and the output current/> Perform fast Fourier decomposition to obtain the access point voltage/> and the output current/> The harmonic amplitude at each harmonic frequency, and the virtual impedance value at each harmonic frequency is calculated by Ohm's law;
选定存在虚拟阻抗的谐波频率，得到谐波频率集，其中，所述谐波频率集中各个谐波频率所需的谐波次数的集合为/>，/>到/>的数值依次增大；Select the harmonic frequency with virtual impedance and get the harmonic frequency set , wherein the set of harmonic orders required for each harmonic frequency in the harmonic frequency set is / > ,/> To/> The values of increase in sequence;
在所述谐波频率集中筛选出最大虚拟阻抗值对应的目标谐波频率，通过对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别，其中，所述对目标谐波频率/>在谐波频率集范围出现的偏移进行检测来对配电网短路故障进行识别包括：Filter out the maximum virtual impedance value in the harmonic frequency set Corresponding target harmonic frequency , by targeting the harmonic frequency/> In the harmonic frequency set/> The deviation of the target harmonic frequency range is detected to identify the short circuit fault of the distribution network, wherein ... At harmonic frequency set The detection of the deviation in the range to identify the short-circuit fault in the distribution network includes:
分别获取目标谐波频率在前后两个周期内的第一检测值/>和第二检测值/>，并计算所述第一检测值/>和所述第二检测值/>之间的第一差值/>，其中，/>为当前信号监测周期中的第二检测值，/>为前一信号监测周期中的第一检测值；Get the target harmonic frequencies respectively The first detection value in the two cycles before and after/> and the second detection value/> , and calculate the first detection value/> and the second detection value/> The first difference between , where /> is the second detection value in the current signal monitoring cycle, /> is the first detection value in the previous signal monitoring cycle;
判断所述第一差值是否大于预设阈值；Determining whether the first difference is greater than a preset threshold;
若所述第一差值大于预设阈值，则记录在初始偏移时刻前一个监测周期的目标谐波频率的检测值为a，并判断在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值是否大于预设阈值；If the first difference is greater than a preset threshold, the target harmonic frequency of the monitoring cycle before the initial offset time is recorded. The detection value is a, and the target harmonic frequency is determined within the preset monitoring period after the initial offset moment. Whether the second difference between the detection value of and a is greater than a preset threshold;
若在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值大于预设阈值，则识别出短路故障，并控制继电开关将分布式电源从配电网中切除。If the target harmonic frequency is continuously set within the preset monitoring period after the initial offset time If the second difference between the detection value of and a is greater than a preset threshold, a short circuit fault is identified and the relay switch is controlled to cut off the distributed power source from the distribution network.
第二方面，本发明提供一种高比例分布式电源接入的配电网短路故障检测系统，包括：In a second aspect, the present invention provides a distribution network short-circuit fault detection system with a high proportion of distributed power sources connected, comprising:
采集模块，配置为采集分布式电源的接入点电压以及输出电流/>；A collection module configured to collect the voltage at the access point of the distributed power supply And the output current/> ;
计算模块，配置为分别对所述接入点电压和所述输出电流/>进行快速傅里叶分解，得到所述接入点电压/>和所述输出电流/>在各个谐波频率处的谐波幅值，并通过欧姆定律计算各个谐波频率处的虚拟阻抗值；The calculation module is configured to respectively calculate the voltage of the access point and the output current/> Perform fast Fourier decomposition to obtain the access point voltage/> and the output current/> The harmonic amplitude at each harmonic frequency, and the virtual impedance value at each harmonic frequency is calculated by Ohm's law;
选定模块，配置为选定存在虚拟阻抗的谐波频率，得到谐波频率集，其中，所述谐波频率集中各个谐波频率所需的谐波次数的集合为，/>到/>的数值依次增大；Select the module, configure it to select the harmonic frequency with virtual impedance, and get the harmonic frequency set , where the set of harmonic orders required for each harmonic frequency in the harmonic frequency set is ,/> To/> The values of increase in sequence;
识别模块，配置为在所述谐波频率集中筛选出最大虚拟阻抗值对应的目标谐波频率/>，通过对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别，其中，所述对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别包括：An identification module configured to filter out a maximum virtual impedance value in the harmonic frequency set Corresponding target harmonic frequency/> , by targeting the harmonic frequency/> In the harmonic frequency set/> The deviation of the target harmonic frequency range is detected to identify the short circuit fault of the distribution network, wherein ... In the harmonic frequency set/> The detection of the deviation in the range to identify the short-circuit fault in the distribution network includes:
分别获取目标谐波频率在前后两个周期内的第一检测值/>和第二检测值/>，并计算所述第一检测值/>和所述第二检测值/>之间的第一差值/>，其中，/>为当前信号监测周期中的第二检测值，/>为前一信号监测周期中的第一检测值；Get the target harmonic frequencies respectively The first detection value in the two cycles before and after/> and the second detection value/> , and calculate the first detection value/> and the second detection value/> The first difference between , where /> is the second detection value in the current signal monitoring cycle, /> is the first detection value in the previous signal monitoring cycle;
判断所述第一差值是否大于预设阈值；Determining whether the first difference is greater than a preset threshold;
若所述第一差值大于预设阈值，则记录在初始偏移时刻前一个监测周期的目标谐波频率的检测值为a，并判断在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值是否大于预设阈值；If the first difference is greater than a preset threshold, the target harmonic frequency of the monitoring cycle before the initial offset time is recorded. The detection value is a, and the target harmonic frequency is determined within the preset monitoring period after the initial offset moment. Whether the second difference between the detection value of and a is greater than a preset threshold;
若在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值大于预设阈值，则识别出短路故障，并控制继电开关将分布式电源从配电网中切除。If the target harmonic frequency is continuously set within the preset monitoring period after the initial offset time If the second difference between the detection value of and a is greater than a preset threshold, a short circuit fault is identified and the relay switch is controlled to cut off the distributed power source from the distribution network.
第三方面，提供一种电子设备，其包括：至少一个处理器，以及与所述至少一个处理器通信连接的存储器，其中，所述存储器存储有可被所述至少一个处理器执行的指令，所述指令被所述至少一个处理器执行，以使所述至少一个处理器能够执行本发明任一实施例的高比例分布式电源接入的配电网短路故障检测方法的步骤。According to a third aspect, an electronic device is provided, comprising: at least one processor, and a memory communicatively connected to the at least one processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the steps of the method for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected thereto according to any embodiment of the present invention.
第四方面，本发明还提供一种计算机可读存储介质，其上存储有计算机程序，所述程序指令被处理器执行时，使所述处理器执行本发明任一实施例的高比例分布式电源接入的配电网短路故障检测方法的步骤。In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes the steps of a method for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected thereto according to any embodiment of the present invention.
本申请的高比例分布式电源接入的配电网短路故障检测方法及系统，采集分布式电源的接入点电压，以及分布式电源的输出电流，分别对其进行快速傅里叶分解，得到电压与电流在各谐波频率处的幅值与相角等信息，并通过欧姆定律计算出各个谐波频率处的虚拟阻抗值；选定谐波频率集，记录虚拟阻抗在各选定谐波频率处的最大幅值所在的频率；通过检测虚拟阻抗最大值所在频率在选定谐波频率范围内的偏移来对短路故障进行有效的识别，能够提高配电网短路故障检测精度，可为配电网分布式电源电路故障保护提供一种新思路。The present invention discloses a method and system for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources, collects the voltage at the access point of the distributed power source and the output current of the distributed power source, performs fast Fourier decomposition on them respectively, obtains information such as the amplitude and phase angle of the voltage and current at each harmonic frequency, and calculates the virtual impedance value at each harmonic frequency by Ohm's law; selects a harmonic frequency set, and records the frequency at which the maximum amplitude of the virtual impedance at each selected harmonic frequency is located; and effectively identifies short-circuit faults by detecting the offset of the frequency at which the maximum value of the virtual impedance is located within the selected harmonic frequency range, which can improve the detection accuracy of short-circuit faults in the distribution network and provide a new idea for fault protection of distributed power supply circuits in the distribution network.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
为了更清楚地说明本发明实施例的技术方案，下面将对实施例描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
图1为本发明一实施例提供的一种高比例分布式电源接入的配电网短路故障检测方法的流程图；FIG1 is a flow chart of a method for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected thereto, provided by an embodiment of the present invention;
图2为本发明一实施例提供一个具体实施例的正常运行状态下的第一谐波域拓扑模型的拓扑结构图；FIG2 is a topological structure diagram of a first harmonic domain topological model under normal operating conditions of a specific embodiment of an embodiment of the present invention;
图3为本发明一实施例提供的一具体实施例的分布式电源到主网的线路上发生短路故障时的第二谐波域拓扑模型的拓扑结构图；3 is a topological structure diagram of a second harmonic domain topological model when a short circuit fault occurs on a line from a distributed power source to a main grid according to a specific embodiment of an embodiment of the present invention;
图4为本发明一实施例提供的一种高比例分布式电源接入的配电网短路故障检测系统的结构框图；FIG4 is a structural block diagram of a distribution network short-circuit fault detection system with a high proportion of distributed power sources connected thereto provided by an embodiment of the present invention;
图5是本发明一实施例提供的电子设备的结构示意图。FIG. 5 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
请参阅图1，其示出了本申请的一种高比例分布式电源接入的配电网短路故障检测方法的流程图。Please refer to FIG1 , which shows a flow chart of a method for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected thereto according to the present application.
如图1所示，高比例分布式电源接入的配电网短路故障检测方法具体包括以下步骤：As shown in FIG1 , the short-circuit fault detection method of the distribution network with a high proportion of distributed generation access specifically includes the following steps:
步骤S101，采集分布式电源的接入点电压以及输出电流/>。Step S101: collecting the voltage at the access point of the distributed power source And the output current/> .
步骤S102，分别对所述接入点电压和所述输出电流/>进行快速傅里叶分解，得到所述接入点电压/>和所述输出电流/>在各个谐波频率处的谐波幅值，并通过欧姆定律计算各个谐波频率处的虚拟阻抗值。Step S102: respectively measuring the voltage of the access point and the output current/> Perform fast Fourier decomposition to obtain the access point voltage/> and the output current/> The harmonic amplitude at each harmonic frequency is calculated, and the virtual impedance value at each harmonic frequency is calculated by Ohm's law.
在本步骤中，构建正常运行状态下的第一谐波域拓扑模型，其中，第一谐波域拓扑模型中用谐波电流源替代网侧电流谐波，用电流源/>替代分布式电源输出电流中的谐波，电网内阻为/> , 分布式电源等效为电流源时并联输出的阻抗为/>，本地负载为/>，网侧到分布式电源的线路阻抗为/>，分布式电源到负载的阻抗为/>，如图2所示。In this step, a first harmonic domain topology model under normal operating conditions is constructed, wherein the first harmonic domain topology model uses a harmonic current source Replace the grid-side current harmonics with a current source/> To replace the harmonics in the output current of the distributed power supply, the internal resistance of the grid is/> , when the distributed power supply is equivalent to a current source, the impedance of the parallel output is/> , the local load is/> , the line impedance from the grid side to the distributed power source is/> , the impedance from the distributed power supply to the load is/> ,as shown in picture 2.
计算短路故障发生前分布式电源的接入点电压和分布式电源的输出电流，其中，计算短路故障发生前分布式电源的接入点电压的表达式为：The access point voltage of the distributed power source and the output current of the distributed power source before the short circuit fault occurs are calculated, wherein the expression for calculating the access point voltage of the distributed power source before the short circuit fault occurs is:
， ,
式中，为短路故障发生前分布式电源的接入点电压；In the formula, is the voltage at the access point of the distributed generation before the short circuit fault occurs;
计算短路故障发生前分布式电源的输出电流的表达式为：The expression for calculating the output current of the distributed generation before a short circuit fault occurs is:
， ,
式中，为短路故障发生前分布式电源的输出电流；In the formula, is the output current of the distributed generation before the short circuit fault occurs;
分别对短路故障发生前分布式电源的接入点电压和短路故障发生前分布式电源的输出电流进行快速傅里叶分解，得到短路故障发生前分布式电源的接入点电压和短路故障发生前分布式电源的输出电流在各个谐波频率处的谐波幅值，并通过欧姆定律计算短路故障发生前各个谐波频率处的虚拟阻抗值，其中，计算短路故障发生前各个谐波频率处的虚拟阻抗值的表达式为：The access point voltage of the distributed power source before the short-circuit fault occurs and the output current of the distributed power source before the short-circuit fault occurs are respectively subjected to fast Fourier decomposition to obtain the harmonic amplitudes of the access point voltage of the distributed power source before the short-circuit fault occurs and the output current of the distributed power source before the short-circuit fault occurs at each harmonic frequency, and the virtual impedance value at each harmonic frequency before the short-circuit fault occurs is calculated by Ohm's law, wherein the expression for calculating the virtual impedance value at each harmonic frequency before the short-circuit fault occurs is:
， ,
式中，为短路故障发生前任一个谐波频率处的虚拟阻抗值。In the formula, It is the virtual impedance value at any harmonic frequency before a short-circuit fault occurs.
构建分布式电源到主网的线路上发生短路故障时的第二谐波域拓扑模型，其中，所述第二谐波域拓扑模型中用谐波电流源替代网侧电流谐波，用电流源/>替代分布式电源输出电流中的谐波，电网内阻为/> , 分布式电源等效为电流源时并联输出的阻抗为/>，本地负载为/>，网侧到分布式电源的线路阻抗为/>，分布式电源到负载的阻抗为/>，如图3所示。Construct a second harmonic domain topology model when a short circuit fault occurs on the line from the distributed power supply to the main grid, wherein the second harmonic domain topology model uses a harmonic current source Replace the grid-side current harmonics with a current source/> To replace the harmonics in the output current of the distributed power supply, the internal resistance of the grid is/> , when the distributed power supply is equivalent to a current source, the impedance of the parallel output is/> , the local load is/> , the line impedance from the grid side to the distributed power source is/> , the impedance from the distributed power supply to the load is/> ,As shown in Figure 3.
计算短路故障发生后分布式电源的接入点电压和分布式电源的输出电流，其中，计算短路故障发生后分布式电源的接入点电压的表达式为：The access point voltage of the distributed power source and the output current of the distributed power source after the short circuit fault occurs are calculated, wherein the expression for calculating the access point voltage of the distributed power source after the short circuit fault occurs is:
， ,
式中，为短路故障发生后分布式电源的接入点电压，/>取值范围为[0，1]的比例系数，用于表征故障点接入点之间的距离；In the formula, is the voltage at the access point of the distributed generation after a short circuit fault occurs,/> The proportionality coefficient with a value range of [0, 1] is used to characterize the distance between the access points of the fault point;
计算短路故障发生后分布式电源的输出电流的表达式为：The expression for calculating the output current of the distributed power supply after a short circuit fault occurs is:
， ,
式中，为短路故障发生后分布式电源的输出电流；In the formula, It is the output current of the distributed power supply after a short circuit fault occurs;
分别对短路故障发生后分布式电源的接入点电压和短路故障发生后分布式电源的输出电流进行快速傅里叶分解，得到短路故障发生后分布式电源的接入点电压和短路故障发生后分布式电源的输出电流在各个谐波频率处的谐波幅值，并通过欧姆定律计算短路故障发生后各个谐波频率处的虚拟阻抗值，其中，计算短路故障发生后各个谐波频率处的虚拟阻抗值的表达式为：The access point voltage of the distributed power source after the short circuit fault occurs and the output current of the distributed power source after the short circuit fault occurs are respectively subjected to fast Fourier decomposition to obtain the harmonic amplitudes of the access point voltage of the distributed power source after the short circuit fault occurs and the output current of the distributed power source after the short circuit fault occurs at each harmonic frequency, and the virtual impedance value at each harmonic frequency after the short circuit fault occurs is calculated by Ohm's law, wherein the expression for calculating the virtual impedance value at each harmonic frequency after the short circuit fault occurs is:
， ,
式中，为计算短路故障发生后任一个谐波频率处的虚拟阻抗值。In the formula, To calculate the virtual impedance value at any harmonic frequency after a short circuit fault occurs.
步骤S103，选定存在虚拟阻抗的谐波频率，得到谐波频率集，其中，所述谐波频率集中各个谐波频率所需的谐波次数的集合为/>，/>到/>的数值依次增大。Step S103, selecting the harmonic frequency with virtual impedance to obtain the harmonic frequency set , wherein the set of harmonic orders required for each harmonic frequency in the harmonic frequency set is/> ,/> To/> The values increase in sequence.
步骤S104，在所述谐波频率集中筛选出最大虚拟阻抗值对应的目标谐波频率/>，通过对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别。Step S104, selecting the maximum virtual impedance value in the harmonic frequency set Corresponding target harmonic frequency/> , by targeting the harmonic frequency/> In the harmonic frequency set/> The deviation of the range is detected to identify the short-circuit fault of the distribution network.
在本步骤中，对目标谐波频率在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别包括：In this step, the target harmonic frequency In the harmonic frequency set/> The detection of the deviation in the range to identify the short-circuit fault in the distribution network includes:
分别获取目标谐波频率在前后两个周期内的第一检测值/>和第二检测值/>，并计算所述第一检测值/>和所述第二检测值/>之间的第一差值/>，其中，/>为当前信号监测周期中的第二检测值，/>为前一信号监测周期中的第一检测值；Get the target harmonic frequencies respectively The first detection value in the two cycles before and after/> and the second detection value/> , and calculate the first detection value/> and the second detection value/> The first difference between , where /> is the second detection value in the current signal monitoring cycle, /> is the first detection value in the previous signal monitoring cycle;
判断所述第一差值是否大于预设阈值；Determining whether the first difference is greater than a preset threshold;
若所述第一差值不大于预设阈值，则不触发短路故障保护；若所述第一差值大于预设阈值，则记录在初始偏移时刻前一个监测周期的目标谐波频率的检测值为a，并判断在初始偏移时刻后连续预设监测周期内目标谐波频率/>的检测值与a的第二差值是否大于预设阈值；If the first difference is not greater than the preset threshold, the short-circuit fault protection is not triggered; if the first difference is greater than the preset threshold, the target harmonic frequency of the monitoring cycle before the initial offset time is recorded. The detection value is a, and the target harmonic frequency is determined within the preset monitoring period after the initial offset moment. Whether the second difference between the detection value of and a is greater than a preset threshold;
若在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值大于预设阈值，则识别出短路故障，并控制继电开关将分布式电源从配电网中切除；若在初始偏移时刻后连续预设监测周期内目标谐波频率/>的检测值与a的第二差值不大于预设阈值，则不触发短路故障保护。其中，预设阈值为结合系统参数的设定值。If the target harmonic frequency is continuously set within the preset monitoring period after the initial offset time If the second difference between the detection value of and a is greater than the preset threshold, a short circuit fault is identified and the relay switch is controlled to cut off the distributed power source from the distribution network; if the target harmonic frequency is continuously set within the preset monitoring period after the initial offset time / > If the second difference between the detection value of and a is not greater than a preset threshold, the short circuit fault protection is not triggered. The preset threshold is a set value combined with system parameters.
在本实施例中，利用RT-LAB建立仿真模型，研究实时仿真结果。其中，半实物仿真平台中包含RT-LAB上位机和仿真设备等；上位机为计算机，用于模型的搭建和操作；下位机为实时仿真器，用于模型的运行和计算；控制器为被测控制器。上位机与下位机间通过网线连接，用于模型的下载和数据的传输。在RT-LAB上位机的Simulink仿真工具中搭建含分布式电源的配电网模型，并将主回路模型下载至仿真设备中进行实时仿真，得到RT-LAB半实物仿真模型，其中，主回路模型中包括分布式电源模型，线路阻抗等。In this embodiment, RT-LAB is used to establish a simulation model and study the real-time simulation results. Among them, the semi-physical simulation platform includes an RT-LAB host computer and simulation equipment, etc.; the host computer is a computer used for model construction and operation; the lower computer is a real-time simulator used for model operation and calculation; the controller is a controller under test. The host computer and the lower computer are connected by a network cable for model download and data transmission. A distribution network model containing distributed power sources is built in the Simulink simulation tool of the RT-LAB host computer, and the main loop model is downloaded to the simulation equipment for real-time simulation to obtain an RT-LAB semi-physical simulation model, wherein the main loop model includes a distributed power source model, line impedance, etc.
综上，本申请的方法，采集分布式电源的接入点电压，以及分布式电源的输出电流，分别对其进行快速傅里叶分解，得到电压与电流在各谐波频率处的幅值与相角等信息，并通过欧姆定律计算出各个谐波频率处的虚拟阻抗值；选定谐波频率集，记录虚拟阻抗在各选定谐波频率处的最大幅值所在的频率；通过检测虚拟阻抗最大值所在频率在选定谐波频率范围内的偏移来对短路故障进行有效的识别，能够提高配电网短路故障检测精度。In summary, the method of the present application collects the access point voltage of the distributed power supply and the output current of the distributed power supply, performs fast Fourier decomposition on them respectively, obtains information such as the amplitude and phase angle of the voltage and current at each harmonic frequency, and calculates the virtual impedance value at each harmonic frequency through Ohm's law; selects a harmonic frequency set, and records the frequency at which the maximum amplitude of the virtual impedance at each selected harmonic frequency is located; and effectively identifies short-circuit faults by detecting the offset of the frequency at which the maximum value of the virtual impedance is located within the selected harmonic frequency range, which can improve the detection accuracy of short-circuit faults in the distribution network.
请参阅图4，其示出了本申请的一种高比例分布式电源接入的配电网短路故障检测系统的结构框图。Please refer to FIG. 4 , which shows a structural block diagram of a distribution network short-circuit fault detection system with a high proportion of distributed power sources connected to the present application.
如图4所示，配电网短路故障检测系统200，包括采集模块210、计算模块220、选定模块230以及识别模块240。As shown in FIG. 4 , the distribution network short-circuit fault detection system 200 includes a collection module 210 , a calculation module 220 , a selection module 230 and an identification module 240 .
其中，采集模块210，配置为采集分布式电源的接入点电压以及输出电流/>；计算模块220，配置为分别对所述接入点电压/>和所述输出电流/>进行快速傅里叶分解，得到所述接入点电压/>和所述输出电流/>在各个谐波频率处的谐波幅值，并通过欧姆定律计算各个谐波频率处的虚拟阻抗值；选定模块230，配置为选定存在虚拟阻抗的谐波频率，得到谐波频率集/>，其中，所述谐波频率集中各个谐波频率所需的谐波次数的集合为/>，/>到/>的数值依次增大；识别模块240，配置为在所述谐波频率集中筛选出最大虚拟阻抗值/>对应的目标谐波频率/>，通过对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别，其中，所述对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别包括：分别获取目标谐波频率/>在前后两个周期内的第一检测值/>和第二检测值/>，并计算所述第一检测值和所述第二检测值/>之间的第一差值，其中，/>为当前信号监测周期中的第二检测值，/>为前一信号监测周期中的第一检测值；判断所述第一差值是否大于预设阈值；若所述第一差值大于预设阈值，则记录在初始偏移时刻前一个监测周期的目标谐波频率/>的检测值为a，并判断在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值是否大于预设阈值；若在初始偏移时刻后连续预设监测周期内目标谐波频率/>的检测值与a的第二差值大于预设阈值，则识别出短路故障，并控制继电开关将分布式电源从配电网中切除。The acquisition module 210 is configured to acquire the voltage at the access point of the distributed power source. And the output current/> ; Calculation module 220, configured to calculate the voltage of the access point respectively /> and the output current/> Perform fast Fourier decomposition to obtain the access point voltage/> and the output current/> The harmonic amplitude at each harmonic frequency is calculated, and the virtual impedance value at each harmonic frequency is calculated by Ohm's law; the selection module 230 is configured to select the harmonic frequency with virtual impedance to obtain the harmonic frequency set / > , wherein the set of harmonic orders required for each harmonic frequency in the harmonic frequency set is / > ,/> To/> The values increase successively; the identification module 240 is configured to filter out the maximum virtual impedance value in the harmonic frequency set. Corresponding target harmonic frequency/> , by targeting the harmonic frequency/> In the harmonic frequency set/> The deviation of the target harmonic frequency range is detected to identify the short circuit fault of the distribution network, wherein ... In the harmonic frequency set/> The detection of the deviation of the range to identify the short-circuit fault of the distribution network includes: obtaining the target harmonic frequency respectively/> The first detection value in the two cycles before and after/> and the second detection value/> , and calculate the first detection value and the second detection value/> The first difference between , where /> is the second detection value in the current signal monitoring cycle, /> is the first detection value in the previous signal monitoring cycle; determines whether the first difference is greater than a preset threshold; if the first difference is greater than the preset threshold, records the target harmonic frequency of the monitoring cycle before the initial offset time. The detection value is a, and the target harmonic frequency is determined within the preset monitoring period after the initial offset moment. Whether the second difference between the detection value of and a is greater than a preset threshold; if the target harmonic frequency is continuously preset within the monitoring period after the initial offset moment / > If the second difference between the detection value of and a is greater than a preset threshold, a short circuit fault is identified and the relay switch is controlled to cut off the distributed power source from the distribution network.
应当理解，图4中记载的诸模块与参考图1中描述的方法中的各个步骤相对应。由此，上文针对方法描述的操作和特征以及相应的技术效果同样适用于图4中的诸模块，在此不再赘述。It should be understood that the modules recorded in Figure 4 correspond to the steps in the method described with reference to Figure 1. Therefore, the operations and features described above for the method and the corresponding technical effects are also applicable to the modules in Figure 4 and will not be described in detail here.
在另一些实施例中，本发明实施例还提供了一种计算机可读存储介质，其上存储有计算机程序，所述程序指令被处理器执行时，使所述处理器执行上述任意方法实施例中的高比例分布式电源接入的配电网短路故障检测方法；In some other embodiments, the embodiments of the present invention further provide a computer-readable storage medium having a computer program stored thereon, wherein when the program instructions are executed by a processor, the processor executes a method for detecting short-circuit faults in a distribution network with a high proportion of distributed power sources connected thereto in any of the above method embodiments;
作为一种实施方式，本发明的计算机可读存储介质存储有计算机可执行指令，计算机可执行指令设置为：As an implementation mode, the computer-readable storage medium of the present invention stores computer-executable instructions, and the computer-executable instructions are configured as follows:
采集分布式电源的接入点电压以及输出电流/>；Collect the voltage at the access point of distributed power supply And the output current/> ;
分别对所述接入点电压和所述输出电流/>进行快速傅里叶分解，得到所述接入点电压/>和所述输出电流/>在各个谐波频率处的谐波幅值，并通过欧姆定律计算各个谐波频率处的虚拟阻抗值；The access point voltage and the output current/> Perform fast Fourier decomposition to obtain the access point voltage/> and the output current/> The harmonic amplitude at each harmonic frequency, and the virtual impedance value at each harmonic frequency is calculated by Ohm's law;
选定存在虚拟阻抗的谐波频率，得到谐波频率集，其中，所述谐波频率集中各个谐波频率所需的谐波次数的集合为/>，/>到/>的数值依次增大；Select the harmonic frequency with virtual impedance and get the harmonic frequency set , wherein the set of harmonic orders required for each harmonic frequency in the harmonic frequency set is/> ,/> To/> The values of increase in sequence;
在所述谐波频率集中筛选出最大虚拟阻抗值对应的目标谐波频率，通过对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别，其中，所述对目标谐波频率/>在谐波频率集范围出现的偏移进行检测来对配电网短路故障进行识别包括：Filter out the maximum virtual impedance value in the harmonic frequency set Corresponding target harmonic frequency , by targeting the harmonic frequency/> In the harmonic frequency set/> The deviation of the target harmonic frequency range is detected to identify the short circuit fault of the distribution network, wherein ... At harmonic frequency set The detection of the deviation in the range to identify the short-circuit fault in the distribution network includes:
分别获取目标谐波频率在前后两个周期内的第一检测值/>和第二检测值/>，并计算所述第一检测值/>和所述第二检测值/>之间的第一差值/>，其中，/>为当前信号监测周期中的第二检测值，/>为前一信号监测周期中的第一检测值；Get the target harmonic frequencies respectively The first detection value in the two cycles before and after/> and the second detection value/> , and calculate the first detection value/> and the second detection value/> The first difference between , where /> is the second detection value in the current signal monitoring cycle, /> is the first detection value in the previous signal monitoring cycle;
判断所述第一差值是否大于预设阈值；Determining whether the first difference is greater than a preset threshold;
若所述第一差值大于预设阈值，则记录在初始偏移时刻前一个监测周期的目标谐波频率的检测值为a，并判断在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值是否大于预设阈值；If the first difference is greater than a preset threshold, the target harmonic frequency of the monitoring cycle before the initial offset time is recorded. The detection value is a, and the target harmonic frequency is determined within the preset monitoring period after the initial offset moment. Whether the second difference between the detection value of and a is greater than a preset threshold;
若在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值大于预设阈值，则识别出短路故障，并控制继电开关将分布式电源从配电网中切除。If the target harmonic frequency is continuously set within the preset monitoring period after the initial offset time If the second difference between the detection value of and a is greater than a preset threshold, a short circuit fault is identified and the relay switch is controlled to cut off the distributed power source from the distribution network.
计算机可读存储介质可以包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需要的应用程序；存储数据区可存储根据高比例分布式电源接入的配电网短路故障检测系统的使用所创建的数据等。此外，计算机可读存储介质可以包括高速随机存取存储器，还可以包括存储器，例如至少一个磁盘存储器件、闪存器件、或其他非易失性固态存储器件。在一些实施例中，计算机可读存储介质可选包括相对于处理器远程设置的存储器，这些远程存储器可以通过网络连接至高比例分布式电源接入的配电网短路故障检测系统。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。The computer-readable storage medium may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of a distribution network short-circuit fault detection system with a high proportion of distributed power sources connected, etc. In addition, the computer-readable storage medium may include a high-speed random access memory, and may also include a memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer-readable storage medium may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the distribution network short-circuit fault detection system with a high proportion of distributed power sources connected via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.
图5是本发明实施例提供的电子设备的结构示意图，如图5所示，该设备包括：一个处理器310以及存储器320。电子设备还可以包括：输入装置330和输出装置340。处理器310、存储器320、输入装置330和输出装置340可以通过总线或者其他方式连接，图5中以通过总线连接为例。存储器320为上述的计算机可读存储介质。处理器310通过运行存储在存储器320中的非易失性软件程序、指令以及模块，从而执行服务器的各种功能应用以及数据处理，即实现上述方法实施例高比例分布式电源接入的配电网短路故障检测方法。输入装置330可接收输入的数字或字符信息，以及产生与高比例分布式电源接入的配电网短路故障检测系统的用户设置以及功能控制有关的键信号输入。输出装置340可包括显示屏等显示设备。FIG5 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. As shown in FIG5, the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, the memory 320, the input device 330 and the output device 340 may be connected via a bus or other means. FIG5 takes the bus connection as an example. The memory 320 is the above-mentioned computer-readable storage medium. The processor 310 executes various functional applications and data processing of the server by running the non-volatile software program, instructions and modules stored in the memory 320, that is, the distribution network short-circuit fault detection method with a high proportion of distributed power sources connected in the above-mentioned method embodiment is realized. The input device 330 may receive input digital or character information, and generate key signal input related to user settings and function control of the distribution network short-circuit fault detection system with a high proportion of distributed power sources connected. The output device 340 may include display devices such as display screens.
上述电子设备可执行本发明实施例所提供的方法，具备执行方法相应的功能模块和有益效果。未在本实施例中详尽描述的技术细节，可参见本发明实施例所提供的方法。The electronic device can execute the method provided by the embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. For technical details not described in detail in this embodiment, please refer to the method provided by the embodiment of the present invention.
作为一种实施方式，上述电子设备应用于高比例分布式电源接入的配电网短路故障检测系统中，用于客户端，包括：至少一个处理器；以及，与至少一个处理器通信连接的存储器；其中，存储器存储有可被至少一个处理器执行的指令，指令被至少一个处理器执行，以使至少一个处理器能够：As an implementation mode, the electronic device is applied to a distribution network short-circuit fault detection system with a high proportion of distributed power sources connected, and is used for a client, comprising: at least one processor; and a memory connected to the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can:
采集分布式电源的接入点电压以及输出电流/>；Collect the voltage at the access point of distributed power supply And the output current/> ;
分别对所述接入点电压和所述输出电流/>进行快速傅里叶分解，得到所述接入点电压/>和所述输出电流/>在各个谐波频率处的谐波幅值，并通过欧姆定律计算各个谐波频率处的虚拟阻抗值；The access point voltage and the output current/> Perform fast Fourier decomposition to obtain the access point voltage/> and the output current/> The harmonic amplitude at each harmonic frequency, and the virtual impedance value at each harmonic frequency is calculated by Ohm's law;
选定存在虚拟阻抗的谐波频率，得到谐波频率集，其中，所述谐波频率集中各个谐波频率所需的谐波次数的集合为/>，/>到/>的数值依次增大；Select the harmonic frequency with virtual impedance and get the harmonic frequency set , wherein the set of harmonic orders required for each harmonic frequency in the harmonic frequency set is/> ,/> To/> The values of increase in sequence;
在所述谐波频率集中筛选出最大虚拟阻抗值对应的目标谐波频率，通过对目标谐波频率/>在谐波频率集/>范围出现的偏移进行检测来对配电网短路故障进行识别，其中，所述对目标谐波频率/>在谐波频率集范围出现的偏移进行检测来对配电网短路故障进行识别包括：Filter out the maximum virtual impedance value in the harmonic frequency set Corresponding target harmonic frequency , by targeting the harmonic frequency/> In the harmonic frequency set/> The deviation of the target harmonic frequency range is detected to identify the short circuit fault of the distribution network, wherein ... At harmonic frequency set The detection of the deviation in the range to identify the short-circuit fault of the distribution network includes:
分别获取目标谐波频率在前后两个周期内的第一检测值/>和第二检测值/>，并计算所述第一检测值/>和所述第二检测值/>之间的第一差值/>，其中，/>为当前信号监测周期中的第二检测值，/>为前一信号监测周期中的第一检测值；Get the target harmonic frequencies respectively The first detection value in the two cycles before and after/> and the second detection value/> , and calculate the first detection value/> and the second detection value/> The first difference between , where /> is the second detection value in the current signal monitoring cycle, /> is the first detection value in the previous signal monitoring cycle;
判断所述第一差值是否大于预设阈值；Determining whether the first difference is greater than a preset threshold;
若所述第一差值大于预设阈值，则记录在初始偏移时刻前一个监测周期的目标谐波频率的检测值为a，并判断在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值是否大于预设阈值；If the first difference is greater than a preset threshold, the target harmonic frequency of the monitoring cycle before the initial offset time is recorded. The detection value is a, and the target harmonic frequency is determined within the preset monitoring period after the initial offset moment. Whether the second difference between the detection value of and a is greater than a preset threshold;
若在初始偏移时刻后连续预设监测周期内目标谐波频率的检测值与a的第二差值大于预设阈值，则识别出短路故障，并控制继电开关将分布式电源从配电网中切除。If the target harmonic frequency is continuously set within the preset monitoring period after the initial offset time If the second difference between the detection value of and a is greater than a preset threshold, a short circuit fault is identified and the relay switch is controlled to cut off the distributed power source from the distribution network.
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到各实施方式可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件。基于这样的理解，上述技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品可以存储在计算机可读存储介质中，如ROM/RAM、磁碟、光盘等，包括若干指令用以使得一台计算机设备（可以是个人计算机，服务器，或者网络设备等）执行各个实施例或者实施例的某些部分的方法。Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM/RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiment.
最后应说明的是：以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
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