CN108667013B - Method for identifying and analyzing switch positions of multi-source heterogeneous power distribution network - Google Patents

Abstract

The invention discloses a method for identifying and analyzing switch positions of a multi-source heterogeneous power distribution network. The method comprises the following steps: step 1: building a radiation mesh topology structure model by taking each switch in the power distribution network as a joint point; step 2: collecting power data of each switch and monitoring in real time; and step 3: and calculating and analyzing the power of each switch, and judging the position of each switch according to the calculation and analysis result. When the method is adopted to determine the current topological structure, the topological structure can be determined according to the change conditions measured by the relevant nodes on the branch by searching the upper branch and the lower branch of the node, so that the influence of error measurement on the determination of the topological structure is eliminated, and a new thought is provided for error identification in a line loss computing system.

Description

Translated fromChinese

一种多源异构配电网开关位置辨识分析方法A method for identification and analysis of switch positions in a multi-source heterogeneous distribution network

技术领域technical field

本发明涉及配电网开关位置检测领域，具体涉及一种多源异构配电网开关位置辨识分析方法。The invention relates to the field of switch position detection of a distribution network, in particular to a method for identifying and analyzing the switch position of a multi-source heterogeneous distribution network.

背景技术Background technique

多源异构配电网电网侧配有大量的可控开关，使配电网的网络拓扑更加灵活。配网拓扑分析过程中，错误的开关运行状态不仅影响导纳矩阵，甚至还影响电网的拓扑分片和每片电网的节点规模。拓扑分析之后，需要将开关的功率等数据转化成状态估计需要的量测信息。分析量测的生成过程可发现，开关功率的规定正方向、开关倍率发生错误时将生成错误的量测数据。可见，电网开关的错误信息导致了电网状态估计时遇到的绝大多数拓扑错误和坏数据。电力网络拓扑错误，一般分为开关状态闭合而实际断开、开关状态断开而实际闭合。The grid side of the multi-source heterogeneous distribution network is equipped with a large number of controllable switches, which makes the network topology of the distribution network more flexible. In the process of distribution network topology analysis, the wrong switch operation state not only affects the admittance matrix, but also affects the topology segmentation of the grid and the node size of each grid. After topology analysis, it is necessary to convert data such as switch power into measurement information required for state estimation. Analyzing the generation process of the measurement, it can be found that the wrong measurement data will be generated when the specified positive direction of the switching power and the switching ratio are wrong. It can be seen that the wrong information of the grid switch causes most of the topology errors and bad data encountered in the grid state estimation. The power network topology error is generally divided into the switch state is closed but actually disconnected, and the switch state is disconnected and actually closed.

线损计算的关键是获取正确的电网结构、参数、运行数据等。由原始数据不准确造成的计算误差为总误差的82％～84％，可见原始数据是否完整和准确是线损计算结果准确的关键，而线损计算系统获取的电网拓扑结构、运行数据、维护信息等存在大量错误，且辨识困难。为了获取较为准确的线损计算结果，必须排除错误信息，因此在网损计算前先对开关状态信息进行辨识。The key to line loss calculation is to obtain the correct grid structure, parameters, and operating data. The calculation error caused by the inaccuracy of the original data is 82% to 84% of the total error. It can be seen that whether the original data is complete and accurate is the key to the accuracy of the line loss calculation results. There are a lot of errors in information, etc., and identification is difficult. In order to obtain more accurate line loss calculation results, it is necessary to exclude wrong information, so the switch state information should be identified before the network loss calculation.

发明内容SUMMARY OF THE INVENTION

本发明的目的是针对现有技术存在的不足，提供一种多源异构配电网开关位置辨识分析方法。The purpose of the present invention is to provide a method for identifying and analyzing the position of switches in a multi-source heterogeneous distribution network, aiming at the shortcomings of the prior art.

为实现上述目的，本发明提供了一种多源异构配电网开关位置辨识分析方法，包括：In order to achieve the above purpose, the present invention provides a method for identifying and analyzing the switch position of a multi-source heterogeneous distribution network, including:

步骤1：以配电网中各开关作为关节点搭建辐射网状拓扑结构模型；Step 1: Build a radial mesh topology model with each switch in the distribution network as a joint point;

步骤2：采集各开关的功率数据并实时监控；Step 2: Collect the power data of each switch and monitor it in real time;

步骤3：对各开关的功率进行计算分析，并根据所述计算分析的结果判断各开关的位置。Step 3: Calculate and analyze the power of each switch, and determine the position of each switch according to the result of the calculation and analysis.

进一步的，所述步骤3包括：Further, thestep 3 includes:

步骤301：分别统计每一开关断开时造成其它功率发生变化的开关的总数N；Step 301: Count the total number N of switches that cause other power changes when each switch is turned off;

步骤302：统计总数N中实际功率发生变化的开关的成立条件个数N1；Step 302: Count the number N1 of established conditions of switches whose actual power changes in the total number N;

步骤303：计算各开关断开的概率f＝N1/N。Step 303: Calculate the probability f=N1/N that each switch is turned off.

步骤304：当某开关断开的概率f>0.5时，视为断开，否则，视为闭合。Step 304: When the probability f of a switch being turned off is > 0.5, it is regarded as disconnected, otherwise, it is regarded as closed.

进一步的，分析某开关的状态时，以该开关为分界点，将前级开关与本级及后级开关的分别判断；Further, when analyzing the state of a certain switch, the switch is used as the dividing point to judge the difference between the front-stage switch and the current-stage and rear-stage switches;

所述前级开关以abs[P-(P0-P′)]<R作为是否成立的判断条件；The pre-stage switch takes abs[P-(P0-P')]<R as the judgment condition for whether it is established;

所述本级及后级开关以P<R作为是否成立的判断条件，其中，P为功率发生变化前的各开关的有功功率，P0为功率变化后的各开关的有功功率，P′为前级开关减小的有功功率，R为设定值。The current stage and subsequent stage switches take P<R as the judging condition for whether it is established, wherein, P is the active power of each switch before the power changes, P0 is the active power of each switch after the power change, and P' is the former. The active power reduced by the stage switch, R is the set value.

进一步的，在计算分析同一主回路中有两个以上的开关的断开概率时，综合各开关分别和同时断开的条件计算分析，取各开关综合断开概率f最大者作为计算分析结果。Further, when calculating and analyzing the disconnection probability of two or more switches in the same main circuit, the conditions for each switch to be disconnected separately and simultaneously are calculated and analyzed, and the one with the largest comprehensive disconnection probability f of each switch is taken as the calculation and analysis result.

有益效果：采用本发明方法在确定当前拓扑结构时，可以通过所在节点向上、下支路的搜索，根据该条支路上相关节点量测的变化情况来确定拓扑结构，这样同时剔除了错误量测对确定拓扑结构的影响，为线损计算系统中的错误辨识提供了新的思路。Beneficial effect: when the method of the present invention is used to determine the current topology structure, the topological structure can be determined according to the change of the measurement of the relevant nodes on the branch through the search of the upper and lower branches of the node, so that the wrong measurement can be eliminated at the same time. The influence on determining the topology structure provides a new idea for the error identification in the line loss calculation system.

附图说明Description of drawings

图1是本发明实施例的多源异构配电网的结构示意图。FIG. 1 is a schematic structural diagram of a multi-source heterogeneous distribution network according to an embodiment of the present invention.

具体实施方式Detailed ways

下面结合附图和具体实施例，进一步阐明本发明，本实施例在以本发明技术方案为前提下进行实施，应理解这些实施例仅用于说明本发明而不用于限制本发明的范围。The present invention is further illustrated below in conjunction with the accompanying drawings and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

本发明实施例提供了一种多源异构配电网开关位置辨识分析方法，该方法包括：The embodiment of the present invention provides a method for identifying and analyzing the position of a switch in a multi-source heterogeneous distribution network. The method includes:

步骤1：以配电网中各开关作为关节点搭建辐射网状拓扑结构模型。辐射网是指功率按固定方向输送的树枝状网络，配电网一般属于辐射网。当辐射网的拓扑结构没有变化时，无论电网运行状态如何变化，支路上的功率一定是流向由一个或多个负荷点组成的负荷群，网络中的节点具有明确的供电点和受电点之分。Step 1: Build a radial mesh topology model with each switch in the distribution network as a joint point. Radiation network refers to a dendritic network in which power is transported in a fixed direction, and distribution networks generally belong to radiation networks. When the topology of the radiation network does not change, no matter how the operating state of the power grid changes, the power on the branch must flow to the load group composed of one or more load points. The nodes in the network have a clear power supply point and a power receiving point. point.

辐射网有两个主要特点：其一，辐射网中当拓扑结构发生变化时，功率分配关系是可以事先确定的(在不考虑网络损耗的情况下)；其二，辐射网中当拓扑结构发生变化时，各节点的注入功率是可以确定的。Radiation network has two main characteristics: firstly, when the topology changes in the radiation network, the power distribution relationship can be determined in advance (without considering the network loss); secondly, when the topology changes in the radiation network When changing, the injected power of each node can be determined.

步骤2：采集各开关的功率数据并实时监控。Step 2: Collect power data of each switch and monitor it in real time.

步骤3：对各开关的功率进行计算分析，并根据所述计算分析的结果判断各开关的位置。Step 3: Calculate and analyze the power of each switch, and determine the position of each switch according to the result of the calculation and analysis.

其中，步骤3具体包括：Wherein,step 3 specifically includes:

步骤301：分别统计每一开关断开时造成其它功率发生变化的开关的总数N。分析某开关的状态时，以该开关为分界点，将前级开关与本级及后级开关的分别判断。Step 301: Count the total number N of switches that cause other power changes when each switch is turned off. When analyzing the state of a switch, take the switch as the dividing point, and judge the front-stage switch and the current-stage and post-stage switches respectively.

步骤302：统计总数N中实际功率发生变化的开关的成立条件个数N1。所述前级开关以abs[P-(P0-P′)]<R作为是否成立的判断条件。所述本级及后级开关以P<R作为是否成立的判断条件，其中，P为功率发生变化前的各开关有功功率，P0为功率变化后的各开关的有功功率，P′为前级开关减小的有功功率，R为设定值，一般设定为一个较小的正数。Step 302 : Count the number N1 of established conditions of switches whose actual power changes in the total number N. The pre-stage switch takes abs[P-(P0-P')]<R as the judgment condition of whether it is established. The switches of the current stage and the subsequent stage take P<R as the judgment condition of whether it is established, wherein, P is the active power of each switch before the power changes, P0 is the active power of each switch after the power change, and P' is the previous stage. The active power reduced by the switch, R is the set value, generally set to a small positive number.

举例说明，如图1所示，该配电网具有24个开关，标号分别为1至24号，现需要确定开关8的状态，开关8开断后，其后面的开关的功率(9、10、12、13、14)将变为零，其前面的开关的功率(4、3、2、l)将减小P′，与其并列的开关及后续开关(5、6、7、11)及不同主支路上的开关(15及后续节点)功率不变。可以取功率发生变化的节点作为判别开关位置的条件如表1所示：For example, as shown in Figure 1, the power distribution network has 24 switches, and the labels are 1 to 24. Now it is necessary to determine the state of theswitch 8. After theswitch 8 is turned off, the power of the following switches (9, 10, 12, 13, 14) will become zero, the power of the switches preceding it (4, 3, 2, 1) will decrease by P', and the switches parallel to it and subsequent switches (5, 6, 7, 11) and different The power of switches (15 and subsequent nodes) on the main branch remains unchanged. The node where the power changes can be taken as the condition for judging the switch position, as shown in Table 1:

开关8断开的判别条件表Discrimination condition table forswitch 8 off

表1Table 1

其中，P′为开关8断开前的功率，此处，N＝10，当开关8的断开概率f＝N1/N>0.5时，则认为开关8处于断开状态，否则，开关8处于闭合状态。Among them, P' is the power before theswitch 8 is turned off. Here, N=10. When the off probability f=N1/N>0.5 of theswitch 8, theswitch 8 is considered to be in the off state, otherwise, theswitch 8 is in the off state. closed state.

步骤303：计算各开关断开的概率f＝N1/N。Step 303: Calculate the probability f=N1/N that each switch is turned off.

步骤304：当某开关断开的概率f>0.5时，视为断开，否则，视为闭合。Step 304: When the probability f of a switch being turned off is > 0.5, it is regarded as disconnected, otherwise, it is regarded as closed.

在计算分析同一主回路中有两个以上的开关的断开概率时，综合各开关分别和同时断开的条件计算分析，取各开关综合断开概率f最大者作为计算分析结果。如开关8和开关5，这时只需要将开关5开断的条件、开关8开断的条件和开关8和5同时断开的条件分别判断，如表1至3所示：When calculating and analyzing the disconnection probability of two or more switches in the same main circuit, the conditions for each switch to be disconnected separately and simultaneously are calculated and analyzed, and the one with the largest comprehensive disconnection probability f of each switch is taken as the calculation and analysis result. For example,switch 8 andswitch 5, at this time, it is only necessary to judge the condition forswitch 5 to be turned off, the condition forswitch 8 to be turned off, and the condition forswitches 8 and 5 to be turned off at the same time, as shown in Tables 1 to 3:

开关5的断开的判别条件表Discrimination condition table ofswitch 5 OFF

表2Table 2

开关8与开关5同时断开的判别条件表Table of judgment conditions for simultaneous opening ofswitch 8 andswitch 5

表3table 3

其中，P〞为开关5断开前的功率，分别计算出开关5断开的概率f1，开关8断开的概率f2，开关5和8同时断开的概率f3，取f1、f2和f3最大者作为计算分析的结论。Among them, P″ is the power before theswitch 5 is turned off, and the probability f1 of theswitch 5 being turned off, the probability f2 of theswitch 8 being turned off, and the probability f3 of theswitches 5 and 8 being turned off at the same time are calculated respectively. Take the maximum value of f1, f2 and f3 as the conclusion of the computational analysis.

综上所述，采用本发明方法在确定当前拓扑结构时，可以通过所在节点向上、下支路的搜索，根据该条支路上相关节点量测的变化情况来确定拓扑结构，这样同时剔除了错误量测对确定拓扑结构的影响，为线损计算系统中的错误辨识提供了新的思路。To sum up, when the method of the present invention is used to determine the current topology, the topological structure can be determined according to the changes in the measurement of the relevant nodes on the branch through the search of the upper and lower branches of the node, thus eliminating errors at the same time. The influence of measurement on determining the topology provides a new idea for error identification in the line loss calculation system.

以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (2)

Translated fromChinese

1.一种多源异构配电网开关位置辨识分析方法，其特征在于，包括：1. a multi-source heterogeneous distribution network switch position identification analysis method, is characterized in that, comprises:步骤1：以配电网中各开关作为关节点搭建辐射网状拓扑结构模型；Step 1: Build a radial mesh topology model with each switch in the distribution network as a joint point;步骤2：采集各开关的功率数据并实时监控；Step 2: Collect the power data of each switch and monitor it in real time;步骤3：对各开关的功率进行计算分析，并根据所述计算分析的结果判断各开关的位置；Step 3: Calculate and analyze the power of each switch, and determine the position of each switch according to the result of the calculation and analysis;所述步骤3包括：The step 3 includes:步骤301：分别统计每一开关断开时造成其它功率发生变化的开关的总数N；Step 301: Count the total number N of switches that cause other power changes when each switch is turned off;步骤302：统计总数N中实际功率发生变化的开关的成立条件个数N1；Step 302: Count the number N1 of established conditions of switches whose actual power changes in the total number N;步骤303：计算各开关断开的概率f＝N1/N；Step 303: Calculate the probability f=N1/N that each switch is turned off;步骤304：当某开关断开的概率f>0.5时，视为断开，否则，视为闭合；Step 304: When the probability f of a switch being disconnected is > 0.5, it is regarded as disconnected, otherwise, it is regarded as closed;分析某开关的状态时，以该开关为分界点，将前级开关与本级及后级开关的分别判断；When analyzing the state of a switch, take the switch as the demarcation point, and judge the front-stage switch and the current-stage and post-stage switches respectively;所述前级开关以abs[P-(P0-P′)]<R作为是否成立的判断条件；The pre-stage switch takes abs[P-(P0-P')]<R as the judgment condition for whether it is established;所述本级及后级开关以P<R作为是否成立的判断条件，其中，P为功率发生变化前的各开关的有功功率，P0为功率变化后的各开关的有功功率，P′为前级开关减小的有功功率，R为设定值。The current stage and subsequent stage switches take P<R as the judging condition for whether it is established, wherein, P is the active power of each switch before the power changes, P0 is the active power of each switch after the power change, and P' is the former. The active power reduced by the stage switch, R is the set value.2.根据权利要求1所述的多源异构配电网开关位置辨识分析方法，其特征在于，在计算分析同一主回路中有两个以上的开关的断开概率时，综合各开关分别和同时断开的条件计算分析，取各开关综合断开概率f最大者作为计算分析结果。2. The method for position identification and analysis of switches in a multi-source heterogeneous distribution network according to claim 1, wherein when calculating and analyzing the disconnection probability of more than two switches in the same main circuit, each switch is synthesized and The condition of simultaneous disconnection is calculated and analyzed, and the one with the largest comprehensive disconnection probability f of each switch is taken as the calculation and analysis result.

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