CN114784786A - A DC bus voltage control method, device, DC microgrid system and storage medium - Google Patents
A DC bus voltage control method, device, DC microgrid system and storage mediumDownload PDFInfo
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- CN114784786A CN114784786ACN202210505840.8ACN202210505840ACN114784786ACN 114784786 ACN114784786 ACN 114784786ACN 202210505840 ACN202210505840 ACN 202210505840ACN 114784786 ACN114784786 ACN 114784786A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
- H02J1/102—Parallel operation of DC sources being switching converters
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/10—Parallel operation of DC sources
- H02J1/109—Scheduling or re-scheduling the operation of the DC sources in a particular order, e.g. connecting or disconnecting the sources in sequential, alternating or in subsets, to meet a given demand
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for DC mains or DC distribution networks
- H02J1/14—Balancing the load in a network
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
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Abstract
Description
Translated fromChinese技术领域technical field
本申请涉及微电网技术领域，具体而言，涉及一种直流母线电压的控制方法、装置、直流微电网系统及存储介质。The present application relates to the field of microgrid technology, and in particular, to a method and device for controlling DC bus voltage, a DC microgrid system and a storage medium.
背景技术Background technique
从直流微电网的控制角度来讲，直流母线电压是唯一可以衡量直流微电网系统内功率平衡的指标，在现有技术中，对直流母线电压进行控制，一般采用储能系统来实现的直流母线电压的稳定。储能系统在直流微电网发电功率和用电功率不匹配时吸收或提供多余的功率，以保持功率的平衡，维持母线电压稳定。From the perspective of DC microgrid control, the DC bus voltage is the only indicator that can measure the power balance in the DC microgrid system. In the prior art, the DC bus voltage is generally controlled by an energy storage system. voltage stability. The energy storage system absorbs or provides excess power when the power generated by the DC microgrid does not match the power consumption, so as to maintain the balance of power and maintain the stability of the bus voltage.
但这对储能系统提出较高的要求，如需要保证储能系统的容量必须足够大且保证储能系统的充放电速度较高，从而满足系统调节的速率要求，基于对储能系统的要求，会增大微电网的建造成本。However, this puts forward higher requirements on the energy storage system. For example, it is necessary to ensure that the capacity of the energy storage system must be large enough and the charging and discharging speed of the energy storage system must be high, so as to meet the rate requirements of the system adjustment. Based on the requirements of the energy storage system , which will increase the construction cost of the microgrid.
当储能系统的容量不足以维持直流母线电压的控制需求时，储能系统需要进行多次的充放电才可以对直流母线电压进行稳定，导致对直流母线电压的控制响应不够及时，并且多次充放电会直接影响其使用寿命。When the capacity of the energy storage system is not enough to maintain the control requirements of the DC bus voltage, the energy storage system needs to be charged and discharged multiple times to stabilize the DC bus voltage, resulting in an untimely control response to the DC bus voltage, and multiple times Charging and discharging will directly affect its service life.
发明内容SUMMARY OF THE INVENTION
本申请的目的在于提供一种直流母线电压的控制方法、装置、直流微电网系统及存储介质，能够降低建造成本的同时，提高对直流母线电压控制的响应速度。The purpose of the present application is to provide a DC bus voltage control method, device, DC micro grid system and storage medium, which can reduce the construction cost and at the same time improve the response speed to the DC bus voltage control.
为了实现上述目的，本申请实施例采用的技术方案如下：In order to achieve the above purpose, the technical solutions adopted in the embodiments of the present application are as follows:
第一方面，本申请实施例提供了一种直流母线电压的控制方法，应用于直流微电网系统，所述直流微电网系统包括风电机组和直流微电网，所述直流微电网包括光伏发电组和负载区，所述风电机组和/或所述光伏发电组通过直流母线与所述负载区连接，并对所述负载区进行供电，所述方法包括：In a first aspect, an embodiment of the present application provides a method for controlling a DC bus voltage, which is applied to a DC microgrid system, where the DC microgrid system includes a wind turbine and a DC microgrid, and the DC microgrid includes a photovoltaic power generation group and a DC microgrid. A load area, the wind turbine and/or the photovoltaic power generation group is connected to the load area through a DC bus, and supplies power to the load area, and the method includes:
在检测到所述直流微电网存在负载需求的情况下，通过AC/DC变流器将所述风电机组并入所述直流微电网中，其中，所述负载需求指示所述光伏发电组的功率小于所述负载区的消耗功率；In the case of detecting that there is a load demand in the DC microgrid, the wind turbine is integrated into the DC microgrid through an AC/DC converter, wherein the load demand indicates the power of the photovoltaic generation group less than the power consumption of the load area;
实时检测直流母线电压，并确定所述直流母线电压是否存在升高或降低；Detecting the DC bus voltage in real time, and determining whether the DC bus voltage has increased or decreased;
在所述直流母线电压升高的情况下，调整所述风电机组的第一参数，以使所述直流母线电压下降至设定区间；In the case that the DC bus voltage increases, adjust the first parameter of the wind turbine to make the DC bus voltage drop to a set interval;
在所述直流母线电压降低的情况下，调整所述风电机组的第二参数，以使所述直流母线电压上升至设定区间。When the DC bus voltage decreases, the second parameter of the wind turbine is adjusted so that the DC bus voltage rises to a set interval.
在可选的实施方式中，所述风电机组包括叶轮，所述叶轮包含变桨系统，所述在所述直流母线电压升高的情况下，调整所述风电机组的第一参数，以使所述直流母线电压下降至设定区间的步骤，包括：In an optional embodiment, the wind turbine includes an impeller, and the impeller includes a pitch system, and when the DC bus voltage increases, the first parameter of the wind turbine is adjusted so that all The steps for the DC bus voltage to drop to the set interval include:
在所述直流母线电压升高的情况下，依次降低所述风电机组的转矩、控制所述变桨系统减少桨叶的迎风面积、降低所述叶轮转速，以使直流母线电压下降至设定区间。When the DC bus voltage increases, the torque of the wind turbine is reduced in sequence, the pitch system is controlled to reduce the windward area of the blades, and the rotational speed of the impeller is reduced, so that the DC bus voltage drops to the set value interval.
在可选的实施方式中，所述风电机组包括叶轮，所述叶轮包含变桨系统，所述在所述直流母线电压降低的情况下，调整所述风电机组的第二参数，以使所述直流母线电压上升至稳定状态的步骤，包括：In an optional embodiment, the wind turbine includes an impeller, and the impeller includes a pitch system, and when the DC bus voltage decreases, the second parameter of the wind turbine is adjusted so that the Steps for DC bus voltage to rise to steady state, including:
在所述直流母线电压降低的情况下，依次增大所述风电机组的转矩、控制所述变桨系统增大桨叶的迎风面积、增大所述叶轮的转速以及向所述直流母线输出第一功率，以使直流母线电压上升至设定区间。When the DC bus voltage decreases, the torque of the wind turbine is sequentially increased, the pitch system is controlled to increase the windward area of the blades, the rotational speed of the impeller is increased, and the output is output to the DC bus. The first power, so that the DC bus voltage rises to the set interval.
在可选的实施方式中，所述方法还包括：In an optional embodiment, the method further includes:
在检测到所述直流微电网不存在负载需求的情况下，通过DC/AC变流器将所述风电机组并入交流电网；In the case that it is detected that there is no load demand in the DC microgrid, the wind power generator set is merged into the AC grid through a DC/AC converter;
实时检测所述直流微电网是否存在负载需求；Detecting in real time whether there is a load demand in the DC microgrid;
在检测到所述直流微电网存在负载需求的情况下，断开所述风电机组与所述交流电网的连接。Disconnecting the wind turbine from the AC power grid when it is detected that there is a load demand on the DC microgrid.
在可选的实施方式中，所述直流微电网系统还包括储能系统，所述方法还包括：In an optional embodiment, the DC microgrid system further includes an energy storage system, and the method further includes:
确定所述风电机组的实际所发有功功率；determining the actual generated active power of the wind turbine;
将所述实际所发有功功率与所述负载需求进行比较；comparing the actual generated active power to the load demand;
在所述实际所发有功功率大于所述负载需求情况下，判断所述储能系统是否需要充电；In the case that the actual generated active power is greater than the load demand, determine whether the energy storage system needs to be charged;
若需要，则对所述储能系统进行充电操作。If necessary, a charging operation is performed on the energy storage system.
在可选的实施方式中，在所述直流母线电压降低的情况下，调整所述风电机组的第二参数，以使所述直流母线电压上升至设定区间的步骤之后，所述方法还包括：In an optional implementation manner, after the step of adjusting the second parameter of the wind turbine to increase the DC bus voltage to a set interval when the DC bus voltage decreases, the method further includes :
检测调整后的所述直流母线的第一电压；detecting the adjusted first voltage of the DC bus;
在所述第一电压不属于所述设定区间的情况下，调用所述储能系统对所述直流母线进行放电，以使所述直流母线电压上升至设定区间。When the first voltage does not belong to the set interval, the energy storage system is called to discharge the DC bus, so that the DC bus voltage rises to the set interval.
第二方面，本申请实施例提供了一种应用于直流微电网系统，所述装置包括：In a second aspect, an embodiment of the present application provides a system applied to a DC microgrid, and the device includes:
处理模块，用于在检测到直流微电网存在负载需求的情况下，通过AC/DC变流器将风电机组并入所述直流微电网中，其中，所述负载需求指示所述光伏发电组的功率小于负载区的消耗功率；The processing module is configured to incorporate the wind turbines into the DC microgrid through an AC/DC converter when a load demand is detected in the DC microgrid, wherein the load demand indicates the photovoltaic power generation The power is less than the power consumption in the load area;
检测模块，用于实时检测直流母线电压，并确定所述直流母线电压是否存在升高或降低；a detection module for detecting the DC bus voltage in real time, and determining whether the DC bus voltage increases or decreases;
第一调整模块，用于在所述直流母线电压升高的情况下，调整所述风电机组的第一参数，以使所述直流母线电压下降至设定区间；a first adjustment module, configured to adjust the first parameter of the wind turbine when the voltage of the DC bus increases, so that the voltage of the DC bus drops to a set interval;
第二调整模块，用于在所述直流母线电压降低的情况下，调整所述风电机组的第二参数，以使所述直流母线电压上升至设定区间。The second adjustment module is configured to adjust the second parameter of the wind power generator set when the voltage of the DC bus decreases, so that the voltage of the DC bus increases to a set interval.
第三方面，本申请实施例提供了一种直流微电网系统，包括存储器和处理器，所述存储器存储有计算机程序，所述处理器执行所述计算机程序时实现所述直流母线电压的控制方法的步骤。In a third aspect, an embodiment of the present application provides a DC microgrid system, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the control method for the DC bus voltage when the computer program is executed A step of.
第四方面，本申请实施例提供了一种存储介质，其上存储有计算机程序，该计算机程序被处理器执行时实现所述直流母线电压的控制方法的步骤。In a fourth aspect, an embodiment of the present application provides a storage medium on which a computer program is stored, and when the computer program is executed by a processor, implements the steps of the method for controlling the DC bus voltage.
本申请具有以下有益效果：This application has the following beneficial effects:
本申请通过在检测到直流微电网存在负载需求的情况下，通过AC/DC变流器将风电机组并入直流微电网中，其中，负载需求指示光伏发电组的功率小于直流微电网的消耗功率；实时检测直流母线电压，并确定直流母线电压是否存在升高或降低；在直流母线电压升高的情况下，调整风电机组的第一参数，以使直流母线电压下降至设定区间；在直流母线电压降低的情况下，调整风电机组的第二参数，以使直流母线电压上升至设定区间。相比传统的采用储能系统来控制直流母线电压稳定的方法，本申请通过风力发电机组对直流母线电压的控制方法，可以降低直流微电网建造成本，提高直流母线电压的稳定性和提高对直流母线电压控制的响应速度。In the present application, in the case of detecting that there is a load demand in the DC microgrid, the wind turbines are incorporated into the DC microgrid through an AC/DC converter, wherein the load demand indicates that the power of the photovoltaic generation group is less than the power consumption of the DC microgrid ; Detect the DC bus voltage in real time, and determine whether the DC bus voltage increases or decreases; when the DC bus voltage increases, adjust the first parameter of the wind turbine to make the DC bus voltage drop to the set range; When the busbar voltage decreases, adjust the second parameter of the wind turbine so that the DC busbar voltage rises to the set interval. Compared with the traditional method of using the energy storage system to control the voltage stability of the DC bus, the present application can reduce the construction cost of the DC micro-grid, improve the stability of the DC bus voltage, and improve the stability of the DC bus voltage through the control method for the DC bus voltage of the wind turbine. Response speed of bus voltage control.
附图说明Description of drawings
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，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相关的附图。In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the scope, and for those of ordinary skill in the art, other related drawings can also be obtained according to these drawings without any creative effort.
图1为本申请实施例提供的直流微电网系统的方框示意图；1 is a schematic block diagram of a DC microgrid system provided by an embodiment of the present application;
图2为本申请实施例提供的一种直流母线电压的控制方法的步骤流程图之一；FIG. 2 is one of the step flow charts of a method for controlling a DC bus voltage provided by an embodiment of the present application;
图3为本申请实施例提供的一种直流母线电压的控制方法的步骤流程图之二；FIG. 3 is the second flowchart of the steps of a method for controlling a DC bus voltage according to an embodiment of the present application;
图4为本申请实施例提供的一种直流母线电压的控制方法的步骤流程图之三；FIG. 4 is the third flowchart of the steps of a method for controlling a DC bus voltage provided by an embodiment of the present application;
图5为本申请实施例提供的一种直流母线电压的控制方法的步骤流程图之四；FIG. 5 is the fourth flowchart of the steps of a method for controlling a DC bus voltage provided by an embodiment of the present application;
图6为本申请实施例提供的一种直流母线电压的控制装置的结构框图。FIG. 6 is a structural block diagram of a control device for a DC bus voltage according to an embodiment of the present application.
具体实施方式Detailed ways
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请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申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，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，都属于本申请保护的范围。Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.
此外，若出现术语“第一”、“第二”等仅用于区分描述，而不能理解为指示或暗示相对重要性。In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“设置”、“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be interpreted in a broad sense, for example, it may be a fixed connection, It can also be a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.
经过发明人大量研究发现，在现有技术中对直流母线电压进行控制时，通常采用储能系统来实现的直流母线电压的稳定。储能系统在直流微电网发电功率和用电功率不匹配时吸收或提供多余的功率，以保持功率的平衡，维持母线电压稳定。然而基于储能系统来实现直流母线电压的稳定，需要保证储能系统具有较大的容量和较高的充放电速度，为了满足以上条件，导致对直流母线的控制方案中，需要增加建造成本。若储能系统的容量不足以维持系统的稳定，则需要储能系统进行多次充电和放电的操作，从而减少储能系统的使用寿命，并且多次的充电和放电，使得无法及时对直流母线电压的进行稳定控制。After extensive research by the inventor, it is found that in the prior art, when controlling the DC bus voltage, an energy storage system is usually used to achieve the stabilization of the DC bus voltage. The energy storage system absorbs or provides excess power when the power generated by the DC microgrid does not match the power consumption, so as to maintain the balance of power and maintain the stability of the bus voltage. However, to achieve the stability of the DC bus voltage based on the energy storage system, it is necessary to ensure that the energy storage system has a large capacity and a high charging and discharging speed. In order to meet the above conditions, the control scheme of the DC bus needs to increase the construction cost. If the capacity of the energy storage system is not enough to maintain the stability of the system, the energy storage system needs to perform multiple charging and discharging operations, thereby reducing the service life of the energy storage system. The voltage is controlled stably.
有鉴于对上述问题的发现，本实施例提供了一种直流母线电压的控制方法、装置、直流微电网系统及存储介质，相比传统的采用储能系统来控制直流母线电压稳定的方法，本申请通过风力发电机组对直流母线电压的控制方法，可以降低直流微电网建造成本，提高直流母线电压的稳定性和提高对直流母线电压控制的响应速度，下面对本实施例提供的方案进行详细阐述。In view of the discovery of the above problems, this embodiment provides a DC bus voltage control method, device, DC micro-grid system and storage medium. Compared with the traditional method of using an energy storage system to control the DC bus voltage stability, this The application uses the control method for the DC bus voltage of the wind turbine, which can reduce the construction cost of the DC microgrid, improve the stability of the DC bus voltage, and improve the response speed to the DC bus voltage control. The scheme provided in this embodiment is described in detail below.
本实施例提供一种可以对直流母线电压进行控制的直流微电网系统。在一种可能的实现方式中，所述直流微电网系统可以为风力发电控制系统。This embodiment provides a DC microgrid system that can control the DC bus voltage. In a possible implementation manner, the DC microgrid system may be a wind power generation control system.
请参照图1，图1是本申请实施例提供的直流微电网系统100的结构示意图。所述直流微电网系统100还可包括比图1中所示更多或者更少的组件，或者具有与图1所示不同的配置。图1中所示的各组件可以采用硬件、软件或其组合实现。Please refer to FIG. 1 , which is a schematic structural diagram of a
所述直流微电网系统100包括直流母线电压的控制装置110、存储器120及处理器130。The
所述存储器120及处理器130各元件相互之间直接或间接地电性连接，以实现数据的传输或交互。例如，这些元件相互之间可通过一条或多条通讯总线或信号线实现电性连接。所述直流母线电压的控制装置110包括至少一个可以软件或固件(firmware)的形式存储于所述存储器120中或固化在所述直流微电网系统100的操作系统(operating system，OS)中的软件功能模块。所述处理器130用于执行所述存储器120中存储的可执行模块，例如所述直流母线电压的控制装置110所包括的软件功能模块及计算机程序等。The elements of the
其中，所述存储器120可以是，但不限于，随机存取存储器(RandomAccess Memory，RAM)，只读存储器(Read Only Memory，ROM)，可编程只读存储器(Programmable Read-OnlyMemory，PROM)，可擦除只读存储器(Erasable ProgrammableRead-Only Memory，EPROM)，电可擦除只读存储器(Electric Erasable ProgrammableRead-Only Memory，EEPROM)等。其中，存储器120用于存储程序，所述处理器130在接收到执行指令后，执行所述程序。Wherein, the
请参照图2，图2为应用于图1的直流微电网系统100的一种直流母线电压的控制方法的流程图，以下将方法包括各个步骤进行详细阐述。Please refer to FIG. 2 . FIG. 2 is a flowchart of a method for controlling the DC bus voltage applied to the
该方法应用于直流微电网系统，直流微电网系统包括风电机组和直流微电网，直流微电网包括光伏发电组和负载区，风电机组和/或光伏发电组通过直流母线与负载区连接，并对负载区进行供电。The method is applied to a DC microgrid system. The DC microgrid system includes a wind turbine and a DC microgrid. The DC microgrid includes a photovoltaic power generation group and a load area. The wind turbine and/or photovoltaic power generation group is connected to the load area through a DC bus, and the supply power to the load area.
在直流微电网存在负载需求时，风电机组才会并入直流微电网中，在直流微电网不存在负载需求时，风电机组与直流微电网断开电连接，此时光伏发电组为直流微电网的负载区进行供电。When there is a load demand in the DC microgrid, the wind turbine will be merged into the DC microgrid. When there is no load demand in the DC microgrid, the wind turbine will be disconnected from the DC microgrid. At this time, the photovoltaic power generation group is a DC microgrid. the load area to supply power.
步骤201：在检测到直流微电网存在负载需求的情况下，通过AC/DC变流器将风电机组并入直流微电网中。Step 201: In the case of detecting that there is a load demand in the DC microgrid, incorporate the wind turbine into the DC microgrid through an AC/DC converter.
其中，负载需求指示光伏发电组的功率小于负载区的消耗功率。Wherein, the load demand indicates that the power of the photovoltaic power generation group is less than the power consumption of the load area.
直流微电网系统中的数据处理部件，实时确定直流微电网是否存在负载需求，其中，负载需求为当前光伏发电组的发电功率无法满足直流微电网中负载区所要消耗的功率。The data processing component in the DC microgrid system determines in real time whether there is a load demand in the DC microgrid, where the load demand is the power consumed by the current photovoltaic power generation that cannot meet the power consumption in the load area of the DC microgrid.
光伏发电是根据光生伏特效应原理，利用太阳电池将太阳光能直接转化为电能。Photovoltaic power generation is based on the principle of photovoltaic effect, using solar cells to directly convert sunlight energy into electrical energy.
例如：当前阳光较差时，光伏发电组无法基于将足够的光能转换为电能，此时直流微电网需要消耗的功率大于光伏发电组产出的功率，此时表征直流微电网存在负载需求。当阳光较足时，光伏发电组可以将足够的光能转换为电能，并且光伏发电组产出的电能足以支撑负载区需要消耗的功率，此时表征直流微电网不存在负载需求。For example, when the current sunlight is poor, the photovoltaic power generation unit cannot convert enough light energy into electrical energy. At this time, the power consumed by the DC microgrid is greater than the power output by the photovoltaic power generation unit, which indicates that there is a load demand on the DC microgrid. When the sunlight is sufficient, the photovoltaic power generation group can convert enough light energy into electrical energy, and the electric energy produced by the photovoltaic power generation group is sufficient to support the power that needs to be consumed in the load area. At this time, it means that there is no load demand in the DC microgrid.
步骤202：实时检测直流母线电压，并确定直流母线电压是否存在升高或降低。Step 202 : Detect the DC bus voltage in real time, and determine whether the DC bus voltage increases or decreases.
在投入的变电站直流微电网中，直流母线电压的频繁波动，在波动幅度较大时，会导致故障滤波器频繁启动，同时对直流微电网受电设备造成隐患，如：可能导致保护出口继电器的误动等事故。In the DC microgrid of the substation that is put into operation, the frequent fluctuation of the DC bus voltage will cause the fault filter to start frequently when the fluctuation range is large, and at the same time cause hidden dangers to the power receiving equipment of the DC microgrid, such as: it may lead to the protection of the outlet relay. Accidents such as misoperation.
因此，实时检测直流母线电压，并判断当前直流母线电压是否在设定区间内，其中，设定区间指示直流母线电压处于正常电压区间内。Therefore, the DC bus voltage is detected in real time, and it is determined whether the current DC bus voltage is within the set interval, wherein the set interval indicates that the DC bus voltage is within the normal voltage interval.
基于设定区间，确定当前直流母线电压低于设定区间的最低值还是高于设定区间的最高值，在直流母线电压低于设定区间的最低值时，确定直流母线电压存在降低的情况，在直流母线电压高于设定区间的最高值时，确定直流母线电压存在升高的情况。Based on the set interval, determine whether the current DC bus voltage is lower than the lowest value of the set interval or higher than the highest value of the set interval, and when the DC bus voltage is lower than the lowest value of the set interval, it is determined that the DC bus voltage has decreased , when the DC bus voltage is higher than the highest value of the set interval, it is determined that the DC bus voltage has increased.
基于直流母线电压升高或者降低的情况，调用风电机组对直流母线电压进行调控，使得直流母线电压稳定在设定区间内。Based on the increase or decrease of the DC bus voltage, the wind turbine is called to regulate the DC bus voltage, so that the DC bus voltage is stable within the set interval.
步骤203：在直流母线电压升高的情况下，调整风电机组的第一参数，以使直流母线电压下降至设定区间。Step 203: When the DC bus voltage increases, adjust the first parameter of the wind turbine so that the DC bus voltage drops to a set interval.
风电机组包括叶轮，叶轮包含变桨系统，针对如何调整风电机组的第一参数，来降低直流母线电压的方式可以为：The wind turbine includes an impeller, and the impeller includes a pitch system. How to adjust the first parameter of the wind turbine to reduce the DC bus voltage can be as follows:
在直流母线电压升高的情况下，依次降低风电机组的转矩、控制变桨系统减少桨叶的迎风面积、降低叶轮转速，以使直流母线电压下降至设定区间。When the DC bus voltage increases, reduce the torque of the wind turbine, control the pitch system to reduce the windward area of the blades, and reduce the impeller speed, so that the DC bus voltage drops to the set range.
风电机组首先采用转矩控制的方式，即降低风电机组的转矩，从而快速阻止直流母线电压上升，此时，风电机组的响应时间为毫秒级，然后控制变桨系统减少桨叶的迎风面积，降低叶轮转速，限定风电机组的有功输出，从而保持直流母线电压下降至设定区间内，从而保持直流母线电压处于稳定状态。风电机组通过双PI控制器实现上述功能。The wind turbine first adopts the torque control method, that is, the torque of the wind turbine is reduced, so as to quickly prevent the DC bus voltage from rising. At this time, the response time of the wind turbine is milliseconds, and then the pitch system is controlled to reduce the windward area of the blades. Reduce the speed of the impeller and limit the active output of the wind turbine, so as to keep the DC bus voltage within the set range, so as to keep the DC bus voltage in a stable state. The wind turbine realizes the above functions through dual PI controllers.
步骤204：在直流母线电压降低的情况下，调整风电机组的第二参数，以使直流母线电压上升至设定区间。Step 204 : when the DC bus voltage decreases, adjust the second parameter of the wind turbine so that the DC bus voltage rises to the set interval.
在检测到直流微电网存在负载需求的情况下，将风电机组并入直流微电网中，且此时风电机组预留有功率调节能力，即风电机组在并入直流微电网中时，并非以最大有功功率输出模式运行，而是预留部分有功功率调节能力，即预留部分有功功率即为第一功率。When it is detected that there is a load demand in the DC microgrid, the wind turbine is integrated into the DC microgrid, and the wind turbine has reserved power regulation capability at this time, that is, when the wind turbine is integrated into the DC microgrid, it is not The active power output mode operates, but reserves part of the active power adjustment capability, that is, the reserved part of the active power is the first power.
此时，在直流母线电压降低时，依次增大风电机组的转矩、控制变桨系统增大桨叶的迎风面积、增大叶轮的转速以及向直流母线输出第一功率，以使直流母线电压上升至设定区间。所预留的有功功率即第一功率，可在直流母线电压降低时对其进行调节。At this time, when the DC bus voltage decreases, sequentially increase the torque of the wind turbine, control the pitch system to increase the windward area of the blades, increase the speed of the impeller, and output the first power to the DC bus, so as to make the DC bus voltage rise to the set range. The reserved active power is the first power, which can be adjusted when the DC bus voltage decreases.
需要说明的是，预留的第一功率根据系统供、需有功功率的相关比例设定，本申请对第一功率的具体数值不做具体限制。It should be noted that the reserved first power is set according to the relevant ratio of the active power supplied and required by the system, and the specific value of the first power is not specifically limited in this application.
基于增大风电机组的转矩、控制变桨系统增大桨叶的迎风面积、增大叶轮的转速以及向直流母线输出第一功率，可以提高对直流母线电压控制的响应，其响应时间约为500ms。Based on increasing the torque of the wind turbine, controlling the pitch system to increase the windward area of the blades, increasing the rotational speed of the impeller, and outputting the first power to the DC bus, the response to the DC bus voltage control can be improved, and the response time is about 500ms.
本申请通过在检测到直流微电网存在负载需求的情况下，通过AC/DC变流器将风电机组并入直流微电网中，其中，负载需求指示光伏发电组的功率小于直流微电网的消耗功率；实时检测直流母线电压，并确定直流母线电压是否存在升高或降低；在直流母线电压升高的情况下，调整风电机组的第一参数，以使直流母线电压下降至设定区间；在直流母线电压降低的情况下，调整风电机组的第二参数，以使直流母线电压上升至设定区间。相比传统的采用储能系统来控制直流母线电压稳定的方法，本申请通过风力发电机组对直流母线电压的控制方法，可以降低直流微电网建造成本，提高直流母线电压的稳定性和提高对直流母线电压控制的响应速度。In the present application, in the case of detecting that there is a load demand in the DC microgrid, the wind turbines are incorporated into the DC microgrid through an AC/DC converter, wherein the load demand indicates that the power of the photovoltaic generation group is less than the power consumption of the DC microgrid ; Detect the DC bus voltage in real time, and determine whether the DC bus voltage increases or decreases; when the DC bus voltage increases, adjust the first parameter of the wind turbine to make the DC bus voltage drop to the set range; When the busbar voltage decreases, adjust the second parameter of the wind turbine so that the DC busbar voltage rises to the set interval. Compared with the traditional method of using the energy storage system to control the voltage stability of the DC bus, the present application can reduce the construction cost of the DC micro-grid, improve the stability of the DC bus voltage, and improve the stability of the DC bus voltage through the control method for the DC bus voltage of the wind turbine. Response speed of bus voltage control.
在本申请的另一实施例中，如图3所示，提供了一种直流母线电压的控制方法，具体包括如下步骤：In another embodiment of the present application, as shown in FIG. 3 , a method for controlling the DC bus voltage is provided, which specifically includes the following steps:
步骤301：在检测到直流微电网不存在负载需求的情况下，通过DC/AC变流器将风电机组并入交流电网。Step 301 : In the case that it is detected that there is no load demand in the DC microgrid, the wind turbine is integrated into the AC grid through the DC/AC converter.
步骤302：实时检测直流微电网是否存在负载需求。Step 302: Detect in real time whether there is a load demand in the DC microgrid.
步骤303：在检测到直流微电网存在负载需求的情况下，断开风电机组与交流电网的连接。Step 303: Disconnect the wind turbine from the AC power grid when it is detected that there is a load demand in the DC microgrid.
在检测到直流微电网不存在负载需求的情况下，通过DC/AC并网变流器将所发功率发送至交流电网中，增加微电网场站的收益。When it is detected that there is no load demand in the DC microgrid, the generated power is sent to the AC grid through the DC/AC grid-connected converter to increase the revenue of the microgrid station.
交流电网为现在的国家电力网，包含有发电厂、变电站、输电线路网、配电变压器和低压线路网。The AC power grid is the current national power grid, including power plants, substations, transmission line networks, distribution transformers and low-voltage line networks.
在将风电机组并入交流电网进行发电时，同时检测直流微电网是否存在负载请求，在检测到直流微电网存在负载请求时，断开风电机组与交流电网的连接，并将风电机组并入直流微电网中，为直流微电网中的负载区进行供电。When the wind turbine is integrated into the AC grid for power generation, it is also detected whether there is a load request in the DC microgrid. When it is detected that there is a load request in the DC microgrid, the connection between the wind turbine and the AC grid is disconnected, and the wind turbine is merged into the DC In the microgrid, power is supplied to the load area in the DC microgrid.
在本申请的另一实施例中，如图4所示，提供了一种直流母线电压的控制方法，具体包括如下步骤：In another embodiment of the present application, as shown in FIG. 4 , a method for controlling the DC bus voltage is provided, which specifically includes the following steps:
步骤401：确定风电机组的实际所发有功功率。Step 401: Determine the actual active power generated by the wind turbine.
步骤402：将实际所发有功功率与负载需求进行比较。Step 402: Compare the actual generated active power with the load demand.
步骤403：在实际所发有功功率大于负载需求情况下，判断储能系统是否需要充电。Step 403 : in the case that the actual generated active power is greater than the load demand, determine whether the energy storage system needs to be charged.
步骤404：若需要，则对储能系统进行充电操作。Step 404: If necessary, perform a charging operation on the energy storage system.
确定风电机组实际所发有功功率，并将风电机组的实际所发有功功率与负载需求进行比较，在风电机组的实际所发有功功率大于负载需求的情况下，表明当前风电机组的实际所发有功功率有富余，在当前风电机组的实际所发有功功率有富余时，判断储能系统是否需要充电，若储能系统需要充电，则对储能系统进行充电，同时满足直流微电网的负载需求。Determine the actual active power generated by the wind turbine, and compare the actual active power generated by the wind turbine with the load demand. In the case that the actual active power generated by the wind turbine is greater than the load demand, it indicates that the current actual active power generated by the wind turbine If there is surplus power, when the actual active power generated by the current wind turbine has surplus, it is judged whether the energy storage system needs to be charged.
对直流微电网系统的储能系统充电，可以保证在后续若直流母线电压降低时，通过储能系统输出功率至直流母线，从而抬高直流母线电压。Charging the energy storage system of the DC microgrid system can ensure that if the DC bus voltage drops in the future, the energy storage system outputs power to the DC bus, thereby raising the DC bus voltage.
在直流母线电压升高时，也可以通过储能系统吸收多余的功率，从而降低直流母线电压，使得直流母线电压可以维持在设定区间内。When the DC bus voltage increases, the excess power can also be absorbed by the energy storage system, thereby reducing the DC bus voltage, so that the DC bus voltage can be maintained within the set range.
在本申请的另一实施例中，如图5所示，提供了一种直流母线电压的控制方法，具体包括如下步骤：In another embodiment of the present application, as shown in FIG. 5 , a method for controlling the DC bus voltage is provided, which specifically includes the following steps:
步骤501：检测调整后的直流母线的第一电压。Step 501: Detect the adjusted first voltage of the DC bus.
步骤502：在第一电压不属于设定区间的情况下，调用储能系统对直流母线进行放电，以使直流母线电压上升至设定区间。Step 502: When the first voltage does not belong to the set interval, call the energy storage system to discharge the DC bus, so that the DC bus voltage rises to the set interval.
储能系统补充投入：若负载需求加大，风电机组预留的有功功率，即风电机组输出第一功率、增大风电机组的转矩、控制变桨系统增大桨叶的迎风面积、增大叶轮的转速后，检测直流母线的第一电压仍未抬高至设定区间内，则此时将储能系统作为补充投入，通过后备电源放电来维持母线电压稳定。Supplementary input of energy storage system: If the load demand increases, the active power reserved by the wind turbine, that is, the first power output of the wind turbine, increases the torque of the wind turbine, controls the pitch system to increase the windward area of the blades, increases the After the speed of the impeller is detected, the first voltage of the DC bus has not been raised to the set interval, then the energy storage system is used as a supplementary input at this time, and the voltage of the bus is kept stable by discharging the backup power supply.
请参照图6，本申请实施例还提供了一种应用于图1所述直流微电网系统100的直流母线电压的控制装置110，所述直流母线电压的控制装置110包括：Referring to FIG. 6 , an embodiment of the present application further provides a DC bus
处理模块111，用于在检测到直流微电网存在负载需求的情况下，通过AC/DC变流器将风电机组并入所述直流微电网中，其中，所述负载需求指示所述光伏发电组的功率小于负载区的消耗功率；The processing module 111 is configured to incorporate a wind turbine into the DC microgrid through an AC/DC converter when a load demand is detected in the DC microgrid, wherein the load demand indicates the photovoltaic power generation group The power is less than the power consumption in the load area;
检测模块112，用于实时检测直流母线电压，并确定所述直流母线电压是否存在升高或降低；A detection module 112, configured to detect the DC bus voltage in real time, and determine whether the DC bus voltage has increased or decreased;
第一调整模块113，用于在所述直流母线电压升高的情况下，调整所述风电机组的第一参数，以使所述直流母线电压下降至设定区间；a first adjustment module 113, configured to adjust the first parameter of the wind turbine when the voltage of the DC bus increases, so that the voltage of the DC bus drops to a set interval;
第二调整模块114，用于在所述直流母线电压降低的情况下，调整所述风电机组的第二参数，以使所述直流母线电压上升至设定区间。The second adjustment module 114 is configured to adjust the second parameter of the wind turbine when the voltage of the DC bus decreases, so that the voltage of the DC bus increases to a set interval.
优选地，所述第一调整模块113具体用于：在所述直流母线电压升高的情况下，依次降低所述风电机组的转矩、控制所述变桨系统减少桨叶的迎风面积、降低所述叶轮转速，以使直流母线电压下降至设定区间。Preferably, the first adjustment module 113 is specifically configured to: under the condition that the DC bus voltage increases, sequentially reduce the torque of the wind turbine, control the pitch system to reduce the windward area of the blades, reduce the The impeller rotates so that the DC bus voltage drops to the set interval.
本申请还提供一种直流微电网系统100，直流微电网系统100包括处理器130以及存储器120。存储器120存储有计算机可执行指令，计算机可执行指令被处理器130执行时，实现该直流母线电压的控制方法。The present application also provides a
本申请实施例还提供一种存储介质，存储介质存储有计算机程序，计算机程序被处理器130执行时，实现该直流母线电压的控制方法。An embodiment of the present application further provides a storage medium, where a computer program is stored in the storage medium, and when the computer program is executed by the
在本申请所提供的实施例中，应该理解到，所揭露的装置和方法，也可以通过其它的方式实现。以上所描述的装置实施例仅仅是示意性的，例如，附图中的流程图和框图显示了根据本申请的多个实施例的装置、方法和计算机程序产品的可能实现的体系架构、功能和操作。在这点上，流程图或框图中的每个方框可以代表一个模块、程序段或代码的一部分，所述模块、程序段或代码的一部分包含一个或多个用于实现规定的逻辑功能的可执行指令。也应当注意，在有些作为替换的实现方式中，方框中所标注的功能也可以以不同于附图中所标注的顺序发生。例如，两个连续的方框实际上可以基本并行地执行，它们有时也可以按相反的顺序执行，这依所涉及的功能而定。也要注意的是，框图和/或流程图中的每个方框、以及框图和/或流程图中的方框的组合，可以用执行规定的功能或动作的专用的基于硬件的系统来实现，或者可以用专用硬件与计算机指令的组合来实现。In the embodiments provided in this application, it should be understood that the disclosed apparatus and method may also be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architectures, functions and possible implementations of apparatuses, methods and computer program products according to various embodiments of the present application. operate. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It is also noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in dedicated hardware-based systems that perform the specified functions or actions , or can be implemented in a combination of dedicated hardware and computer instructions.
另外，在本申请各个实施例中的各功能模块可以集成在一起形成一个独立的部分，也可以是各个模块单独存在，也可以两个或两个以上模块集成形成一个独立的部分。所述功能如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，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)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。In addition, each functional module in each embodiment of the present application may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part. If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.
以上所述，仅为本申请的各种实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应所述以权利要求的保护范围为准。The above are only various embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, All should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.
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