CN110620380A - Virtual power plant control system - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
本发明公开了一种虚拟电厂控制系统，包括分层控制系统，分层控制系统包括一级控制系统、二级控制系统、三级控制系统和四级控制系统。本发明结合虚拟电厂自身的运行特点，提出了基于不同时间尺度的虚拟电厂分层控制策略，通过分层控制系统分别在不同的时间尺度和控制层面上解决虚拟电厂存在难以实现各微源无功功率按下垂系数的分配、电能质量较差、系统不具备全局调节能力等问题，使虚拟电厂在保持一定的就地控制能力的同时还具备全局协调控制能力。
The invention discloses a virtual power plant control system, which includes a layered control system. The layered control system includes a primary control system, a secondary control system, a tertiary control system and a quaternary control system. Combining the operating characteristics of the virtual power plant itself, the present invention proposes a layered control strategy for the virtual power plant based on different time scales, and solves the problem of the virtual power plant being difficult to realize the reactive power of each micro-source at different time scales and control levels through the layered control system. The distribution of power according to the droop coefficient, the poor power quality, and the lack of global adjustment capabilities of the system enable the virtual power plant to maintain a certain local control capability and also have global coordination control capabilities.
Description
技术领域technical field
本发明涉及虚拟电厂技术领域，尤其涉及一种虚拟电厂控制系统。The invention relates to the technical field of virtual power plants, in particular to a virtual power plant control system.
背景技术Background technique
目前家庭型发电厂等这些分布式能源给整个电网的安全性和可靠性带来了严重威胁，正是由于这两个矛盾的存在，现在的电力系统不但存在能源浪费，而且还面临着安全问题，虚拟电厂由此而生，虚拟电厂有着高效经济地调节各台调峰机组、各种储能设备、多种用电设备的负荷，达到更经济地按需增减负荷的目的，而对于风能、太阳能等这些分布式能源与电网之间的矛盾，虚拟电厂也有解决之道，虚拟发电厂在不改变各个分布式能源并网方式的前提下通过先进的控制、计量、通信等技术聚合各类分布式能源和用电设备，并通过更高层面的软件构架实现多个分布式能源的协调优化运行，从而减少分布式能源并网对公网造成的冲击，提高电网的稳定性和可靠性。At present, these distributed energy sources such as household power plants pose a serious threat to the security and reliability of the entire power grid. It is precisely because of the existence of these two contradictions that the current power system not only has energy waste, but also faces security problems. , the virtual power plant is born from this. The virtual power plant can efficiently and economically adjust the load of each peak-shaving unit, various energy storage equipment, and various electrical equipment, so as to achieve the purpose of increasing or decreasing load more economically on demand. For wind energy Virtual power plants also have a solution to the contradictions between distributed energy sources such as energy, solar energy, and the grid. Virtual power plants aggregate various energy sources through advanced control, metering, and communication technologies without changing the way each distributed energy source is connected to the grid. Distributed energy and electrical equipment, and realize the coordinated and optimized operation of multiple distributed energy through a higher-level software architecture, thereby reducing the impact of distributed energy on the public network and improving the stability and reliability of the power grid.
目前虚拟电厂往往引入虚拟阻抗可以削弱线路中阻性成分的影响，使微源釆用感性下垂控制，同时，微源采用改进下垂控制可以满足虚拟电厂各种运行模式的需要，但是，对于多电压源型微源组网的虚拟电厂，仅依靠微源自身的下垂控制还存在一些问题，首先，由于虚拟电厂各线路阻抗上电压降的不等以及负荷分布的不均匀，采用感性下垂控制的微源输出的无功功率并不能按下垂系数分配，很小的输出电压差会造成很大的功率误差，极易造成换流器的过流，其次，下垂控制是一种有差控制，当系统功率波动大时，系统的电压和频率会超出允许的运行范围，再次，虚拟电厂中储能装置的输出功率受其限制，其出力需要根据及系统的经济调度进行调整，鉴于单纯依靠微源的下垂控制，虚拟电厂存在难以实现各微源无功功率按下垂系数的分配、电能质量较差、系统不具备全局调节能力等问题。At present, virtual power plants often introduce virtual impedance to weaken the influence of resistive components in the line, so that the micro-source adopts inductive droop control. At the same time, the micro-source adopts improved droop control to meet the needs of various operating modes of the virtual power plant. However, for multi-voltage There are still some problems in the virtual power plant of the source-type micro-source network, which only relies on the droop control of the micro-source itself. First, due to the unequal voltage drop on each line impedance of the virtual power plant and the uneven load distribution, the micro The reactive power output by the source cannot be distributed according to the droop coefficient. A small output voltage difference will cause a large power error, which can easily cause the overcurrent of the converter. Secondly, the droop control is a kind of differential control. When the system When the power fluctuates greatly, the voltage and frequency of the system will exceed the allowable operating range. Again, the output power of the energy storage device in the virtual power plant is limited by it, and its output needs to be adjusted according to the economic dispatch of the system. Droop control, the virtual power plant has problems such as difficulty in realizing the distribution of reactive power of each micro-source according to the droop coefficient, poor power quality, and the system does not have the ability to adjust globally.
发明内容Contents of the invention
本发明所要解决的技术问题在于，提供一种虚拟电厂控制系统，可以实现虚拟电厂中各微源无功功率按下垂系数的分配、提高电能质量、且使系统具备全局调节能力。The technical problem to be solved by the present invention is to provide a virtual power plant control system, which can realize the distribution of micro-source reactive power according to the droop coefficient in the virtual power plant, improve the power quality, and enable the system to have global adjustment capabilities.
为解决上述的技术问题，本发明的一方面提供一种虚拟电厂控制系统，包括分层控制系统，所述分层控制系统包括一级控制系统、二级控制系统、三级控制系统和四级控制系统；其中：In order to solve the above technical problems, one aspect of the present invention provides a virtual power plant control system, including a hierarchical control system, the hierarchical control system includes a primary control system, a secondary control system, a tertiary control system and a quaternary control system Control system; of which:
所述一级控制系统，包括可再生能源发电系统，所述可再生能源发电系统内设置有能量储能元件和功率型储能元件，用于实现微源内部的优化协调控制；The primary control system includes a renewable energy power generation system, and the renewable energy power generation system is provided with an energy storage element and a power type energy storage element for realizing optimal coordination control within the micro-source;
所述二级控制系统包括有多个微源以及下垂控制的微源DR单元，用于实现功率自动分配；The secondary control system includes a plurality of micro-sources and droop-controlled micro-source DR units for automatic power distribution;
所述三级控制系统包括电压和频率控制单元、联络线功率控制单元和双模式切换控制单元，用于将系统的频率和电压维持在正常范围内；The three-level control system includes a voltage and frequency control unit, a tie line power control unit and a dual-mode switching control unit, which are used to maintain the frequency and voltage of the system within a normal range;
所述四级控制系统包括日前发电计划单元、日内优化调度单元和实时计划调整单元，用于确定各微源在虚拟电厂的二、三级控制过程中承担的功率波动比例。The four-level control system includes a day-ahead power generation planning unit, an intraday optimal dispatching unit, and a real-time plan adjustment unit, which are used to determine the power fluctuation proportions of each micro-source in the second and third-level control processes of the virtual power plant.
优选地，所述一级控制系统用于调度微源内部使所述可再生能源发电系统、所述能量储能元件和所述功率型储能元件之间协调控制，使整个微源系统按照虚拟电厂所述二级控制系统的要求输出功率，调整毫秒级的负荷波动。Preferably, the primary control system is used to schedule micro-sources to coordinate control among the renewable energy generation system, the energy storage element and the power-type energy storage element, so that the entire micro-source system follows a virtual The required output power of the secondary control system of the power plant adjusts the load fluctuation of millisecond level.
优选地，所述二级控制系统包括多个包含有微源单元以及微源DR单元的子系统；所述微源包括逆变器接口型微源以及旋转电机接口型微源；其中旋转电机接口型微源采用感性下垂控制的微源DR单元；Preferably, the secondary control system includes a plurality of subsystems including a micro-source unit and a micro-source DR unit; the micro-source includes an inverter interface type micro-source and a rotary motor interface type micro-source; wherein the rotary motor interface The type micro source adopts the micro source DR unit with inductive droop control;
其中，所述二级控制系统用于利用所述下垂控制的微源DR单元进行微源自身的下垂控制，使各微源按照能量管理系统EMS下达的功率基点值和下垂特性曲线的斜率分配系统中的瞬时负荷功率波动，由微源自身执行，调整秒级的负荷波动。Wherein, the secondary control system is used to use the micro-source DR unit of the droop control to perform the droop control of the micro-source itself, so that each micro-source distributes the system according to the power base point value issued by the energy management system EMS and the slope of the droop characteristic curve The instantaneous load power fluctuations in the system are executed by the micro-source itself to adjust the second-level load fluctuations.
优选地，所述三级控制系统包括电压和频率控制单元、联络线功率控制单元和双模式切换控制单元；其中：Preferably, the three-level control system includes a voltage and frequency control unit, a tie line power control unit, and a dual-mode switching control unit; wherein:
所述电压和频率控制单元用于当系统中负荷波动大导致微源的功率运行点偏离基点值大时，调整下垂特性曲线的空载频率和空载电压，将系统的频率和电压维持在允许范围内，由虚拟电厂的能量管理系统EMS执行，针对分钟级的负荷波动进行控制；The voltage and frequency control unit is used to adjust the no-load frequency and no-load voltage of the droop characteristic curve to maintain the frequency and voltage of the system at an allowable Within the range, it is executed by the energy management system EMS of the virtual power plant to control minute-level load fluctuations;
所述联络线功率控制单元用于对虚拟电厂和外部电网之间的联络线的功率进行控制；The tie-line power control unit is used to control the power of the tie-line between the virtual power plant and the external grid;
双模式切换控制单元用于进行微电网孤岛和并网双模式切换控制。The dual-mode switching control unit is used for micro-grid island and grid-connected dual-mode switching control.
优选地，所述电压和频率控制单元中的逆变器下垂曲线所确定的频率和电压运行范围是由换流器的基点功率运行点和下垂系数确定的。Preferably, the frequency and voltage operating range determined by the inverter droop curve in the voltage and frequency control unit are determined by the base power operating point and droop coefficient of the converter.
优选地，所述四级控制系统包括日前发电计划单元、日内优化调度单元和实时计划调整单元，其中：Preferably, the four-level control system includes a day-ahead power generation planning unit, an intraday optimal scheduling unit, and a real-time plan adjustment unit, wherein:
日前发电计划单元用于结合虚拟电厂内可再生能源发电的功率预测和负荷预测，生成每日的发电计划；The day-ahead power generation planning unit is used to combine the power forecast and load forecast of renewable energy generation in the virtual power plant to generate a daily power generation plan;
日内优化调度单元用于根据经济调度和储能系统的剩余电量等信息确定各微源的运行功率基点值和下垂特性曲线的斜率，确定各微源在虚拟电厂的二、三级控制过程中承担的功率波动比例，根据所述发电计划与负荷进行日内的优化调度；The intraday optimal dispatching unit is used to determine the operating power base point value of each micro-source and the slope of the droop characteristic curve based on information such as economic dispatch and the remaining power of the energy storage system, and determine the responsibility of each micro-source in the second and third-level control process of the virtual power plant. According to the power generation plan and load, optimize the dispatch within the day;
实时计划调整单元对日前发电计划单元所生成的发电计划进行实时调整，其由虚拟电厂能量管理系统EMS的执行，针对小时级的负荷波动进行控制。The real-time plan adjustment unit makes real-time adjustments to the power generation plan generated by the day-ahead power generation planning unit, which is executed by the virtual power plant energy management system EMS to control hourly load fluctuations.
实施本发明的实施例，具有如下的有益效果：Implementing the embodiments of the present invention has the following beneficial effects:
本发明提供的一种虚拟电厂控制系统，可以结合虚拟电厂自身的运行特点，实行基于不同时间尺度的虚拟电厂分层控制策略，通过分层控制系统分别在不同的时间尺度和控制层面上解决虚拟电厂存在难以实现各微源无功功率按下垂系数的分配、电能质量较差、系统不具备全局调节能力等问题，使虚拟电厂在保持一定的就地控制能力的同时还具备全局协调控制能力。A virtual power plant control system provided by the present invention can implement hierarchical control strategies for virtual power plants based on different time scales in combination with the operating characteristics of the virtual power plant itself. There are problems in the power plant that it is difficult to realize the distribution of the reactive power of each micro-source according to the droop coefficient, the power quality is poor, and the system does not have the ability of global adjustment, so that the virtual power plant can maintain a certain local control ability and also have the ability of global coordination control.
附图说明Description of drawings
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅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性的前提下，根据这些附图获得其他的附图仍属于本发明的范畴。In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, obtaining other drawings based on these drawings still belongs to the scope of the present invention without any creative effort.
图1为本发明提出的一种虚拟电厂控制系统的结构示意图。Fig. 1 is a schematic structural diagram of a virtual power plant control system proposed by the present invention.
具体实施方式Detailed ways
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图对本发明的具体实施方式做详细的说明。在下面的描述中阐述了很多具体细节以便于充分理解本发明。但是本发明能够以很多不同于在此描述的其它方式来实施，本领域技术人员可以在不违背本发明内涵的情况下做类似改进，因此本发明不受下面公开的具体实施的限制。In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without departing from the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.
参照图1所示，示出了本发明提供的一种虚拟电厂控制系统的结构示意图。在本实施例中，所述虚拟电厂控制系统，包括分层控制系统1，其特征在于，所述分层控制系统包括一级控制系统11、二级控制系统12、三级控制系统13和四级控制系统14；其中：Referring to FIG. 1 , it shows a schematic structural diagram of a virtual power plant control system provided by the present invention. In this embodiment, the virtual power plant control system includes a hierarchical control system 1, which is characterized in that the hierarchical control system includes a primary control system 11, a secondary control system 12, a tertiary control system 13, and a four-level control system. level control system 14; wherein:
所述一级控制系统11，包括可再生能源发电系统111，所述可再生能源发电系统111内设置有能量储能元件112和功率型储能元件113，用于实现微源内部的优化协调控制；The primary control system 11 includes a renewable energy power generation system 111, and the renewable energy power generation system 111 is provided with an energy storage element 112 and a power type energy storage element 113 for realizing optimal coordinated control within the micro-source ;
所述二级控制系统12包括有多个微源以及下垂控制的微源DR单元，用于实现功率自动分配；The secondary control system 12 includes a plurality of micro-sources and droop-controlled micro-source DR units for automatic power distribution;
所述三级控制系统13包括电压和频率控制单元131、联络线功率控制单元132和双模式切换控制单元133，用于将系统的频率和电压维持在正常范围内；The three-level control system 13 includes a voltage and frequency control unit 131, a tie line power control unit 132 and a dual-mode switching control unit 133, which are used to maintain the frequency and voltage of the system within a normal range;
所述四级控制系统14包括日前发电计划单元141、日内优化调度单元142和实时计划调整单元143，用于确定各微源在虚拟电厂的二、三级控制过程中承担的功率波动比例。The four-level control system 14 includes a day-ahead power generation planning unit 141, an intra-day optimal scheduling unit 142, and a real-time plan adjustment unit 143, which are used to determine the proportion of power fluctuations undertaken by each micro-source in the second and third-level control processes of the virtual power plant.
更具体地，在一个例子中，所述一级控制系统11用于调度微源内部使所述可再生能源发电系统111、所述能量储能元件112和所述功率型储能元件113之间协调控制，使整个微源系统按照虚拟电厂所述二级控制系统12的要求输出功率，调整毫秒级的负荷波动，并提高微源内部储能系统的技术和经济性能。。More specifically, in an example, the primary control system 11 is used to schedule micro-source internally to make the renewable energy generation system 111, the energy storage element 112 and the power type energy storage element 113 Coordinated control enables the entire micro-source system to output power according to the requirements of the secondary control system 12 of the virtual power plant, adjust millisecond-level load fluctuations, and improve the technical and economic performance of the internal energy storage system of the micro-source. .
更具体地，在一个例子中，所述二级控制系统包括多个包含有微源121以及微源需求响应(demand response，DR)单元122的子系统；所述微源包括逆变器接口型微源以及旋转电机接口型微源；其中旋转电机接口型微源采用感性下垂控制的微源DR单元，可以和旋转电机接口型微源实现负荷功率共享；More specifically, in an example, the secondary control system includes a plurality of subsystems including a micro-source 121 and a micro-source demand response (demand response, DR) unit 122; the micro-source includes an inverter interface type Micro-source and rotary motor interface micro-source; among them, the rotary motor interface micro-source adopts the micro-source DR unit with inductive droop control, which can share load power with the rotary motor interface micro-source;
其中，所述二级控制系统用于利用所述下垂控制的微源DR单元进行微源自身的下垂控制，使各微源按照能量管理系统(EMS)下达的功率基点值和下垂特性曲线的斜率分配系统中的瞬时负荷功率波动，由微源自身执行，调整秒级的负荷波动。Wherein, the secondary control system is used to use the micro-source DR unit of the droop control to carry out the droop control of the micro-source itself, so that each micro-source follows the power base point value issued by the energy management system (EMS) and the slope of the droop characteristic curve The instantaneous load power fluctuation in the distribution system is executed by the micro-source itself to adjust the second-level load fluctuation.
更具体地，在一个例子中，所述三级控制系统13包括电压和频率控制单元131、联络线功率控制单元132和双模式切换控制单元133；其中：More specifically, in an example, the three-level control system 13 includes a voltage and frequency control unit 131, a tie line power control unit 132, and a dual-mode switching control unit 133; wherein:
所述电压和频率控制单元131用于当系统中负荷波动大导致微源的功率运行点偏离基点值大时，调整下垂特性曲线的空载频率和空载电压，将系统的频率和电压维持在允许范围内，由虚拟电厂的能量管理系统(EMS)执行，针对分钟级的负荷波动进行控制；The voltage and frequency control unit 131 is used to adjust the no-load frequency and no-load voltage of the droop characteristic curve to maintain the system frequency and voltage at Within the allowable range, it is executed by the energy management system (EMS) of the virtual power plant to control minute-level load fluctuations;
所述联络线功率控制单元132用于对虚拟电厂和外部电网之间的联络线的功率进行控制；The tie line power control unit 132 is used to control the power of the tie line between the virtual power plant and the external power grid;
双模式切换控制单元133用于进行微电网孤岛和并网双模式切换控制。The dual-mode switching control unit 133 is used to perform dual-mode switching control of microgrid islanding and grid-connected.
其中，所述电压和频率控制单元131中的逆变器下垂曲线所确定的频率和电压运行范围是由换流器的基点功率运行点和下垂系数确定的。Wherein, the frequency and voltage operating range determined by the inverter droop curve in the voltage and frequency control unit 131 are determined by the base power operating point and the droop coefficient of the converter.
由于在二级控制中，采用了增大下垂系数的办法来改善功率分配精度和系统响应速度，下垂系数的选取并未考虑系统频率和电压运行的上下限，当系统的负荷波动使逆变器的运行点偏离基点功率点较远时，系统的频率和电压能超出系统允许的上下限范围，因此，为提高虚拟电厂的电压质量，需要对虚拟电厂进行三级控制，将系统的频率和电压维持在正常范围内。Because in the secondary control, the method of increasing the droop coefficient is adopted to improve the power distribution accuracy and system response speed, the selection of the droop coefficient does not consider the upper and lower limits of the system frequency and voltage operation. When the load fluctuation of the system makes the inverter When the operating point of the virtual power plant deviates far from the base power point, the frequency and voltage of the system can exceed the upper and lower limits allowed by the system. maintained within the normal range.
更具体地，在一个例子中，所述四级控制系统14包括日前发电计划单元141、日内优化调度单元142和实时计划调整单元143，其中：More specifically, in an example, the four-level control system 14 includes a day-ahead power generation planning unit 141, an intraday optimal scheduling unit 142, and a real-time plan adjustment unit 143, wherein:
日前发电计划单元141用于结合虚拟电厂内可再生能源发电的功率预测和负荷预测，生成每日的发电计划；The day-ahead power generation planning unit 141 is used to combine the power forecast and load forecast of renewable energy generation in the virtual power plant to generate a daily power generation plan;
日内优化调度单元142用于根据经济调度和储能系统的剩余电量等信息确定各微源的运行功率基点值和下垂特性曲线的斜率，确定各微源在虚拟电厂的二、三级控制过程中承担的功率波动比例，根据所述发电计划与负荷进行日内的优化调度；The intraday optimal dispatching unit 142 is used to determine the operating power base point value of each micro-source and the slope of the droop characteristic curve according to information such as economic dispatch and the remaining power of the energy storage system, and determine that each micro-source is in the second and third-level control process of the virtual power plant. According to the proportion of power fluctuations undertaken, optimal scheduling within the day is carried out according to the power generation plan and load;
实时计划调整单元143对日前发电计划单元141所生成的发电计划进行实时调整，其由虚拟电厂能量管理系统(EMS)的执行，针对小时级的负荷波动进行控制。The real-time plan adjustment unit 143 adjusts the power generation plan generated by the day-ahead power generation planning unit 141 in real time, which is executed by the virtual power plant energy management system (EMS) to control hourly load fluctuations.
下面对本发明的操作原理进行简要描述：The operating principle of the present invention is briefly described below:
本发明使用时通过一级控制系统11可调度型微源内部，可再生源发电系统、能量型储能和功率型储能之间的协调控制，使整个微源系统能够按照虚拟电厂二级控制的要求输出功率，并提高微源内部储能系统的技术和经济性能；通过二级控制系统12利用微源自身的下垂控制，使各微源按照系统下达的功率基点值和下垂特性曲线的斜率分配系统中的瞬时负荷功率波动，由微源自身执行，调整秒级的负荷波动；三级控制系统13中当系统中负荷波动大导致微源的功率运行点偏离基点值大时，调整下垂特性曲线的空载频率和空载电压，将系统的频率和电压维持在允许范围内，由虚拟电厂的能量管理系统执行，针对分钟级的负荷波动进行控制，同时，还包括虚拟电厂和外部电网之间的联络线功率控制以及微电网孤岛和并网双模式切换控制；利用四级控制系统14结合虚拟电厂内可再生能源发电的功率预测和负荷预测，根据经济调度和储能系统的剩余电量等信息确定各微源的运行功率基点值和下垂特性曲线的斜率，确定各微源在虚拟电厂的二、三级控制过程中承担的功率波动比例，由虚拟电厂EMS的执行，针对小时级的负荷波动进行控制；综上所述，对于由多台采用下垂控制的微源组网的虚拟电厂，依托虚拟电厂能量管理系统和微源自身的控制特性，可以实现虚拟电厂孤岛运行状态下的一、二、三和四级控制功能，进而实现虚拟电厂的安全、稳定、经济运行。When the present invention is in use, through the coordinated control of the first-level control system 11 inside the schedulable micro-source, the renewable source power generation system, the energy-type energy storage and the power-type energy storage, the entire micro-source system can be controlled according to the second level of the virtual power plant The required output power, and improve the technical and economic performance of the internal energy storage system of the micro-source; use the droop control of the micro-source itself through the secondary control system 12, so that each micro-source follows the power base point value issued by the system and the slope of the droop characteristic curve The instantaneous load power fluctuation in the distribution system is executed by the micro source itself to adjust the load fluctuation at the second level; in the three-level control system 13, when the load fluctuation in the system is large and the power operating point of the micro source deviates greatly from the base point value, the droop characteristic is adjusted The no-load frequency and no-load voltage of the curve, to maintain the frequency and voltage of the system within the allowable range, is executed by the energy management system of the virtual power plant, and controls the minute-level load fluctuation. At the same time, it also includes the relationship between the virtual power plant and the external grid power control of tie-lines between microgrids and dual-mode switching control of micro-grid islands and grid-connected; using four-level control system 14 combined with power forecasting and load forecasting of renewable energy generation in virtual power plants, according to economic dispatch and remaining power of energy storage systems, etc. The information determines the operating power base point value of each micro-source and the slope of the droop characteristic curve, and determines the power fluctuation ratio of each micro-source in the second and third-level control process of the virtual power plant, which is executed by the virtual power plant EMS for hourly loads In summary, for a virtual power plant networked with multiple micro-sources using droop control, relying on the energy management system of the virtual power plant and the control characteristics of the micro-source itself, one, Second, third and fourth-level control functions, and then realize the safe, stable and economical operation of the virtual power plant.
实施本发明的实施例，具有如下的有益效果：Implementing the embodiments of the present invention has the following beneficial effects:
本发明提供的一种虚拟电厂控制系统，可以结合虚拟电厂自身的运行特点，实行基于不同时间尺度的虚拟电厂分层控制策略，通过分层控制系统分别在不同的时间尺度和控制层面上解决虚拟电厂存在难以实现各微源无功功率按下垂系数的分配、电能质量较差、系统不具备全局调节能力等问题，使虚拟电厂在保持一定的就地控制能力的同时还具备全局协调控制能力。A virtual power plant control system provided by the present invention can implement hierarchical control strategies for virtual power plants based on different time scales in combination with the operating characteristics of the virtual power plant itself. There are problems in the power plant that it is difficult to realize the distribution of the reactive power of each micro-source according to the droop coefficient, the power quality is poor, and the system does not have the ability of global adjustment, so that the virtual power plant can maintain a certain local control ability and also have the ability of global coordination control.
以上所述，仅为本发明较佳的具体实施方式，但本发明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发明揭露的技术范围内，根据本发明的技术方案及其发明构思加以等同替换或改变，都应涵盖在本发明的保护范围之内。The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.
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