CN109524970B - Distributed optical storage system-based power distribution network voltage control system and method - Google Patents

Distributed optical storage system-based power distribution network voltage control system and method Download PDF

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CN109524970B
CN109524970B CN201811457307.9A CN201811457307A CN109524970B CN 109524970 B CN109524970 B CN 109524970B CN 201811457307 A CN201811457307 A CN 201811457307A CN 109524970 B CN109524970 B CN 109524970B
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voltage
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CN109524970A (en
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叶斌
王绪利
代磊
蒋从伟
吴斌
李奇
段传科
张健
尹晓峰
冯飞波
闫兴德
杨晓艳
任为民
曹飞
刘同同
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Economic and Technological Research Institute of State Grid Anhui Electric Power Co Ltd
Bengbu Power Supply Co of State Grid Anhui Electric Power Co Ltd
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Economic and Technological Research Institute of State Grid Anhui Electric Power Co Ltd
Bengbu Power Supply Co of State Grid Anhui Electric Power Co Ltd
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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
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by adjustment of reactive power
    • H02J3/383—
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention relates to a power distribution network voltage control system and method based on a distributed optical storage system, comprising a photovoltaic cell panel, a photovoltaic DC/DC converter, a direct current side capacitor, an energy storage battery pack, an energy storage DC/DC converter, an energy storage DC/DC conversion controller and an optical storage DC/AC converter, wherein the input end of the photovoltaic DC/DC converter is connected with the cell panel, the output end of the photovoltaic DC/DC converter is connected with the input end of the optical storage DC/AC converter through the direct current side capacitor, the output end of the optical storage DC/AC converter is connected with the power distribution network through a filter, the input end of the energy storage DC/DC converter is connected with the battery pack, and the output end of the energy storage DC/DC converter is connected with the input end of the optical storage DC/AC converter. The invention can effectively control the voltage of the power distribution network and solve the problem of voltage out-of-limit caused by the large-scale distributed optical storage system after the power distribution network is accessed.

Description

一种基于分布式光储系统的配电网电压控制系统及方法A distribution network voltage control system and method based on a distributed optical storage system

技术领域technical field

本发明涉及配电网领域，具体涉及一种基于分布式光储系统的配电网电压控制系统及方法。The invention relates to the field of distribution networks, in particular to a distribution network voltage control system and method based on a distributed optical storage system.

背景技术Background technique

接入配电网的光储系统主要包括光伏电池板、光伏DC/DC变换器、直流侧电容、储能电池组、储能DC/DC变换器和光储DC/AC变换器。目前，基于光储系统的配电网电压控制是通过控制光储DC/AC变换器的无功功率来实现的，此方法应用得比较广泛。在该方法中，将无功功率参考值和无功功率检测值做差，经过无功功率控制器后生成q轴电流参考值。将q轴电流参考值和q轴电流检测值做差，经过q轴电流控制器后生成q轴输出电压。光储DC/AC变换器根据q轴输出电压输出相应的无功功率。当配电网电压发生变化的时候，无功功率参考值和无功功率检测值的误差也会发生变化，q轴输出电压根据这个误差发生变化，光储DC/AC变换器根据q轴输出电压调节无功功率输出，从而稳定配电网电压。The photovoltaic storage system connected to the distribution network mainly includes photovoltaic panels, photovoltaic DC/DC converters, DC side capacitors, energy storage battery packs, energy storage DC/DC converters and photovoltaic storage DC/AC converters. At present, the distribution network voltage control based on the optical storage system is realized by controlling the reactive power of the optical storage DC/AC converter, and this method is widely used. In this method, the reactive power reference value and the reactive power detection value are made a difference, and the q-axis current reference value is generated after passing through a reactive power controller. The difference between the q-axis current reference value and the q-axis current detection value is made, and the q-axis output voltage is generated after passing through the q-axis current controller. The optical-storage DC/AC converter outputs corresponding reactive power according to the q-axis output voltage. When the distribution network voltage changes, the error between the reactive power reference value and the reactive power detection value will also change, the q-axis output voltage will change according to this error, and the optical-storage DC/AC converter will Regulate reactive power output to stabilize distribution network voltage.

在中国专利CN104810858A中公布了一种光储微电网并网发电系统的控制方法。根据DC-AC并网逆变器并网点电压跌落情况和电网的无功需求设定值，通过DC-AC并网逆变器的无功功率控制以稳定并网点电压。在美国专利US 20100156186 A1中公布了一种光伏燃料电池综合发电系统，利用光储并网逆变器的无功功率控制来稳定并网点电压。In the Chinese patent CN104810858A, a control method of an optical storage microgrid grid-connected power generation system is disclosed. According to the voltage drop of the grid-connected point of the DC-AC grid-connected inverter and the reactive power demand setting value of the grid, the reactive power control of the DC-AC grid-connected inverter is used to stabilize the voltage of the grid-connected point. In the US patent US 20100156186 A1, a photovoltaic fuel cell integrated power generation system is disclosed, which uses the reactive power control of the photovoltaic storage grid-connected inverter to stabilize the grid-connected point voltage.

上述通过DC-AC并网逆变器无功功率控制来稳定并网点电压的方法在分布式光储系统大范围接入配电网时有局限性，控制系统动态特性变差，控制效果受到影响。一方面，无功功率指令值不能是恒定值，随并网点电压的改变而改变，如何准确及时的得到无功功率指令值是一个难点；另一方面，并网点电压的大小不仅与无功功率有关，同时与有功功率也是有关的，在配电网中有功功率发生变化也会影响节点电压的大小。因此，在相关领域中需要寻求更加完善的控制方法，以解决这个实际问题。The above-mentioned method of stabilizing the voltage at the grid-connected point through the reactive power control of the DC-AC grid-connected inverter has limitations when the distributed optical storage system is connected to the distribution network on a large scale, the dynamic characteristics of the control system will deteriorate, and the control effect will be affected. . On the one hand, the command value of reactive power cannot be a constant value and changes with the voltage of the grid-connected point. How to obtain the command value of reactive power accurately and in time is a difficult point; At the same time, it is also related to the active power. The change of active power in the distribution network will also affect the size of the node voltage. Therefore, it is necessary to seek a more complete control method in related fields to solve this practical problem.

发明内容Contents of the invention

本发明的目的在于提供一种基于分布式光储系统的配电网电压控制系统及方法，可以有效地调节电压大小，防制电压越限，以提高配电网电压的稳定性，及光储并网系统运行的稳定性。The purpose of the present invention is to provide a distribution network voltage control system and method based on a distributed optical storage system, which can effectively adjust the voltage, prevent the voltage from exceeding the limit, and improve the stability of the distribution network voltage. The stability of grid-connected system operation.

为实现上述目的，本发明采用了以下技术方案：To achieve the above object, the present invention adopts the following technical solutions:

一种基于分布式光储系统的配电网电压控制系统，包括光伏电池板、光伏DC/DC变换器、直流侧电容、储能电池组、储能DC/DC变换器、储能DC/DC变换控制器、光储DC/AC变换器，光储DC/AC变换控制器，所述光伏DC/DC变换器的输入端与电池板连接，其输出端经直流侧电容与光储DC/AC变换器的输入端连接，光储DC/AC变换器的输出端经滤波器与配电网连接，所述储能DC/DC变换器的输入端与电池组连接，其输出端与光储DC/AC变换器的输入端连接；A distribution network voltage control system based on a distributed photovoltaic storage system, including photovoltaic panels, photovoltaic DC/DC converters, DC side capacitors, energy storage battery packs, energy storage DC/DC converters, energy storage DC/DC Conversion controller, optical storage DC/AC converter, optical storage DC/AC conversion controller, the input end of the photovoltaic DC/DC converter is connected to the battery panel, and its output end is connected to the optical storage DC/AC through the DC side capacitor The input end of the converter is connected, the output end of the optical storage DC/AC converter is connected to the distribution network through a filter, the input end of the energy storage DC/DC converter is connected to the battery pack, and its output end is connected to the optical storage DC /AC converter input connection;

所述储能DC/DC变换控制器的输入端与电池组的输出端、电池板的输出端及配电网连接，其输出端与储能DC/DC变换器的控制端连接，用于检测光伏电池板输出电压和电流信号、储能电池组输出电压和电流信号、以及配电网三相电压信号，通过信号处理后形成储能驱动信号以调节储能DC/DC变换器；The input end of the energy storage DC/DC conversion controller is connected to the output end of the battery pack, the output end of the battery board and the distribution network, and its output end is connected to the control end of the energy storage DC/DC converter for detecting The output voltage and current signals of the photovoltaic panels, the output voltage and current signals of the energy storage battery pack, and the three-phase voltage signals of the distribution network are processed to form energy storage driving signals to adjust the energy storage DC/DC converter;

所述光储DC/AC变换控制器的输入端与配电网及直流侧电容连接，其输出端与光储DC/AC变换器的控制端连接，用于检测直流侧电容电压信号以及配电网三相电压和电流信号，通过计算和处理后形成光储逆变驱动信号以调节光储DC/AC变换器。The input terminal of the optical storage DC/AC conversion controller is connected to the distribution network and the DC side capacitor, and its output terminal is connected to the control terminal of the optical storage DC/AC converter for detecting the DC side capacitor voltage signal and power distribution The three-phase voltage and current signals of the network are calculated and processed to form an optical-storage inverter drive signal to adjust the optical-storage DC/AC converter.

作为上述技术方案的进一步改进：As a further improvement of the above technical solution:

所述储能DC/DC变换控制器包括配电网电压幅值计算器、光伏电池板输出有功功率计算器、储能电池组输出有功功率计算器、V/P下垂控制器、第一减法器、第二减法器及比例积分器；The energy storage DC/DC conversion controller includes a distribution network voltage amplitude calculator, a photovoltaic panel output active power calculator, an energy storage battery pack output active power calculator, a V/P droop controller, and a first subtractor , the second subtractor and proportional integrator;

所述配电网电压幅值计算器的输入端与配电网连接，所述光伏电池板输出有功功率计算器的输入端与电池板的输出端连接，所述储能电池组输出有功功率计算器的输入端与电池组的输出端连接，所述配电网电压幅值计算器的输出端与V/P下垂控制器的输入端连接，所述V/P下垂控制器、光伏电池板输出有功功率计算器的输出端与第一减法器的输入端连接，所述第一减法器及储能电池组输出有功功率计算器的输出端与第二减法器的输入端连接，所述第二减法器的输出端与比例积分器的输入端连接，所述比例积分器的输出端与储能DC/DC变换器的控制端连接。The input terminal of the distribution network voltage amplitude calculator is connected to the distribution network, the input terminal of the photovoltaic panel output active power calculator is connected to the output terminal of the battery panel, and the output active power of the energy storage battery pack is calculated The input terminal of the controller is connected to the output terminal of the battery pack, the output terminal of the distribution network voltage amplitude calculator is connected to the input terminal of the V/P droop controller, and the output terminal of the V/P droop controller and the photovoltaic panel output The output end of the active power calculator is connected to the input end of the first subtractor, and the output end of the active power calculator output by the first subtractor and the energy storage battery pack is connected to the input end of the second subtractor, and the second subtractor The output terminal of the subtractor is connected with the input terminal of the proportional integrator, and the output terminal of the proportional integrator is connected with the control terminal of the energy storage DC/DC converter.

所述电网电压幅值计算器，用于实时采集配电网三相电压信号，计算得到配电网电压幅值信号；所述V/P下垂控制器，用于接收配电网电压幅值信号经过下垂计算和信号处理得到光储系统有功功率参考信号；所述光伏电池板输出有功功率计算器，用于实时采集光伏电池板输出电压和电流信号，通过计算得到光伏电池板输出有功功率信号；所述储能电池组输出有功功率计算器，用于实时采集储能电池组输出电压和电流信号，通过计算得到储能电池组输出有功功率信号；所述第一减法器，用于接收光储系统有功功率参考信号和光伏电池板输出有功功率信号，通过运算得到储能电池组有功功率参考信号；所述第二减法器，用于接收储能电池组有功功率参考信号和储能电池组输出有功功率信号，通过运算得到储能电池组有功功率误差信号；所述比例积分器，用于接收储能电池组有功功率误差信号，通过运算得到DC/DC变换器驱动信号。The grid voltage amplitude calculator is used to collect the three-phase voltage signals of the distribution network in real time, and calculates the distribution network voltage amplitude signal; the V/P droop controller is used to receive the distribution network voltage amplitude signal The active power reference signal of the optical storage system is obtained through droop calculation and signal processing; the photovoltaic cell panel output active power calculator is used to collect the output voltage and current signal of the photovoltaic cell panel in real time, and obtain the output active power signal of the photovoltaic cell panel through calculation; The energy storage battery pack output active power calculator is used to collect the output voltage and current signals of the energy storage battery pack in real time, and to obtain the output active power signal of the energy storage battery pack through calculation; the first subtractor is used to receive The active power reference signal of the system and the active power signal output by the photovoltaic panel are calculated to obtain the active power reference signal of the energy storage battery pack; the second subtractor is used to receive the active power reference signal of the energy storage battery pack and the output of the energy storage battery pack The active power signal is calculated to obtain the active power error signal of the energy storage battery pack; the proportional integrator is used to receive the active power error signal of the energy storage battery pack, and the DC/DC converter drive signal is obtained through calculation.

进一步的，所述V/P下垂控制器包括有功功率上限控制器、有功功率上段下垂控制器、有功钳位控制器、有功功率下段下垂控制器、有功功率下限控制器及第一加法器；所述有功功率上限控制器、有功功率上段下垂控制器、有功钳位控制器、有功功率下段下垂控制器及有功功率下限控制器的输入端均与配电网电压幅值计算器的输出端连接，其输出端均与第一加法器的输入端连接，所述第一加法器的输出端与第一减法器的输入端连接；Further, the V/P droop controller includes an active power upper limit controller, an active power upper droop controller, an active clamp controller, an active power lower droop controller, an active power lower limit controller, and a first adder; The input ends of the active power upper limit controller, active power upper droop controller, active power clamp controller, active power lower droop controller and active power lower limit controller are all connected to the output end of the distribution network voltage amplitude calculator, Its output end is connected with the input end of the first adder, and the output end of the first adder is connected with the input end of the first subtractor;

所述有功功率上限控制器，用于采集配电网电压幅值信号，如果该信号小于或等于Vmin，则输出有功功率参考信号Pmax，如果该信号大于Vmax，则输出为0；所述有功功率上段下垂控制器，用于采集配电网电压幅值信号，如果该信号大于Vmin并小于或等于V1，则根据V/P下垂特性曲线输出有功功率参考信号P1，否则，输出为0；所述有功钳位控制器，用于实时采集配电网电压幅值信号，如果该信号大于V1并小于或等于V2，则输出恒定的有功功率参考信号Po，否则，输出为0；所述有功功率下段下垂控制器，用于采集配电网电压幅值信号，如果该信号大于V2并小于或等于Vmax，则根据V/ P下垂特性曲线输出有功功率参考信号P2，否则，输出为0；所述有功功率下限控制器，用于采集配电网电压幅值信号，如果该信号大于Vmax，则输出有功功率参考信号Pmin，否则，输出为0；所述第一加法器，用于接收有功功率上限控制器、有功功率上段下垂控制器、有功钳位控制器、有功功率下段下垂控制器、有功功率下限控制器的输出信号，经过加法计算得到光储系统有功功率参考信号。The active power upper limit controller is used to collect the distribution network voltage amplitude signal, if the signal is less than or equal to V min , then output the active power reference signal P max , if the signal is greater than V max , the output is 0; The drooping controller in the upper section of the active power is used to collect the voltage amplitude signal of the distribution network. If the signal is greater than V min and less than or equal to V 1 , the active power reference signal P 1 is output according to the V/P droop characteristic curve; otherwise, The output is 0; the active clamp controller is used to collect the distribution network voltage amplitude signal in real time, if the signal is greater than V 1 and less than or equal to V 2 , then output a constant active power reference signal P o , otherwise, The output is 0; the active power lower section droop controller is used to collect the distribution network voltage amplitude signal, if the signal is greater than V2 and less than or equal to Vmax , then output the active power reference signal according to the V/P droop characteristic curve P 2 , otherwise, the output is 0; the active power lower limit controller is used to collect the distribution network voltage amplitude signal, and if the signal is greater than V max , then output the active power reference signal P min , otherwise, the output is 0; The first adder is used to receive the output signals of the active power upper limit controller, the active power upper droop controller, the active power clamp controller, the active power lower droop controller, and the active power lower limit controller. Active power reference signal of storage system.

上述方案中，所述有功功率参考信号Pmax为最大有功参考信号，有功功率参考信号Pmin为最小有功参考信号；所述电压Vmin设定为0.9倍的额定电压值，电压Vmax设定为1.1倍的额定电压值；所述V/P下垂特性曲线为非对称式下垂曲线，有功功率差值Pmax-Po大于有功功率差值Po-Pmin。In the above scheme, the active power reference signal P max is the maximum active reference signal, and the active power reference signal P min is the minimum active reference signal; the voltage V min is set to 0.9 times the rated voltage value, and the voltage V max is set to is 1.1 times the rated voltage value; the V/P droop characteristic curve is an asymmetric droop curve, and the active power difference P max -P o is greater than the active power difference P o -P min .

进一步的，所述光储DC/AC变换控制器包括直流电压控制器、无功功率控制器、电流控制器，锁相环和DC/AC变换驱动信号生成器；Further, the optical storage DC/AC conversion controller includes a DC voltage controller, a reactive power controller, a current controller, a phase-locked loop, and a DC/AC conversion drive signal generator;

所述直流电压控制器的输入端并联在直流侧电容的两端，所述无功功率控制器的输入端与配电网连接，所述直流电压控制器及无功功率控制器的输出端与电流控制器的输入端连接，所述电流控制器的输出端与DC/AC变换驱动信号生成器的输入端连接，DC/AC变换驱动信号生成器的输出端与光储DC/AC变换器的控制端连接，所述锁相环的输入端与无功功率控制器的输入端连接，所述锁相环的输出端与电流控制器的输入端连接。The input terminals of the DC voltage controller are connected in parallel to both ends of the DC side capacitor, the input terminals of the reactive power controller are connected to the distribution network, and the output terminals of the DC voltage controller and the reactive power controller are connected to the The input end of the current controller is connected, the output end of the current controller is connected with the input end of the DC/AC conversion drive signal generator, the output end of the DC/AC conversion drive signal generator is connected with the optical storage DC/AC converter The control terminal is connected, the input terminal of the phase-locked loop is connected with the input terminal of the reactive power controller, and the output terminal of the phase-locked loop is connected with the input terminal of the current controller.

所述直流电压控制器，用于接收直流电容电压信号和直流电压参考信号，通过计算输出d轴电流参考信号；所述无功功率控制器，用于接收配电网三相电压和电流信号，通过计算得到q轴电流参考信号；所述锁相环，用于接收配电网三相电压信号，计算得到电压相位信号；所述电流控制器，用于接收d轴电流参考信号、q轴电流参考信号、配电网三相电流信号和电压相位信号，通过计算得到调制信号；所述DC/AC变换驱动信号生成器，用于根据所接收的调制信号得到驱动信号，并输送至光储DC/AC变换器。所述无功功率控制器包括电压幅值计算器，V/Q下垂控制器、无功功率计算器、第三减法器和比例积分器；所述电压幅值计算器，用于接收配电网三相电压信号经过计算得到电压幅值信号；所述V/Q下垂控制器，用于接收电压幅值信号，通过V/Q下垂特性曲线计算得到无功功率参考信号；所述无功功率计算器，用于接收配电网三相电压和电流信号，经过计算得到无功功率信号；所述第三减法器，用于接收无功功率参考信号和无功功率信号，将两者作减法运算得到无功功率误差值；所述比例积分器，用于接收无功功率误差值，通过计算和处理得到q轴电流参考信号。The DC voltage controller is used to receive the DC capacitor voltage signal and the DC voltage reference signal, and output the d-axis current reference signal through calculation; the reactive power controller is used to receive the three-phase voltage and current signals of the distribution network, The q-axis current reference signal is obtained by calculation; the phase-locked loop is used to receive the three-phase voltage signal of the distribution network, and the voltage phase signal is obtained by calculation; the current controller is used to receive the d-axis current reference signal, the q-axis current The reference signal, the three-phase current signal and the voltage phase signal of the distribution network are calculated to obtain the modulation signal; the DC/AC conversion drive signal generator is used to obtain the drive signal according to the received modulation signal and send it to the optical storage DC /AC converter. The reactive power controller includes a voltage amplitude calculator, a V/Q droop controller, a reactive power calculator, a third subtractor and a proportional integrator; the voltage amplitude calculator is used to receive the distribution network Three-phase voltage signals are calculated to obtain a voltage amplitude signal; the V/Q droop controller is used to receive the voltage amplitude signal, and calculate a reactive power reference signal through the V/Q droop characteristic curve; the reactive power calculation The third subtractor is used to receive the reactive power reference signal and the reactive power signal, and subtract the two The reactive power error value is obtained; the proportional integrator is used to receive the reactive power error value, and obtain the q-axis current reference signal through calculation and processing.

进一步的，所述V/Q下垂控制器包括无功功率上限控制器、无功功率上段下垂控制器、无功钳位控制器、无功功率下段下垂控制器、无功功率下限控制器和第二加法器，所述无功功率上限控制器、无功功率上段下垂控制器、无功钳位控制器、无功功率下段下垂控制器、无功功率下限控制器的输入端均与电压幅值计算器的输出端连接，其输出端均与第二加法器的输入端连接，所述第二加法器的输出端与第三减法器的输入端连接。Further, the V/Q droop controller includes a reactive power upper limit controller, a reactive power upper-stage droop controller, a reactive power clamp controller, a reactive power lower-stage droop controller, a reactive power lower limit controller, and a reactive power lower limit controller. Two adders, the input ends of the reactive power upper limit controller, the reactive power upper droop controller, the reactive clamp controller, the reactive power lower droop controller, and the reactive power lower limit controller are all connected to the voltage amplitude The output terminals of the calculator are connected, and the output terminals are all connected to the input terminals of the second adder, and the output terminals of the second adder are connected to the input terminals of the third subtractor.

一种基于分布式光储系统的配电网电压控制方法，包括以下步骤：A distribution network voltage control method based on a distributed optical storage system, comprising the following steps:

（1）将电池板输出的直流电压通过光伏DC/DC变换器转换为高直流电压，并将转换的电能通过直流侧电容进行存储；(1) Convert the DC voltage output by the battery panel into a high DC voltage through a photovoltaic DC/DC converter, and store the converted electric energy through the DC side capacitor;

（2）通过储能DC/DC变换器吸收直流侧电容电能，通过光储DC/AC变换器将光伏DC/DC变换器输出的直流电压转化为交流电压，并通过滤波后输入到配电网；(2) Absorb the electric energy of the DC side capacitor through the energy storage DC/DC converter, convert the DC voltage output by the photovoltaic DC/DC converter into AC voltage through the optical storage DC/AC converter, and input it to the distribution network after filtering ;

（3）通过储能DC/DC变换控制器实时采集光伏电池板的输出电压Ucell和电流信号Icell、储能电池组的输出电压Upv和电流信号Ipv、以及配电网18的三相电压信号uta、utb、utc，通过信号处理后形成储能驱动信号，执行对储能DC/DC变换器的控制；(3) Through the energy storage DC/DC conversion controller, the output voltage U cell and current signal I cell of the photovoltaic panel, the output voltage U pv and current signal I pv of the energy storage battery pack, and the three parameters of the distribution network 18 are collected in real time. The phase voltage signals u ta , u tb , and u tc are processed to form energy storage drive signals to control the energy storage DC/DC converter;

（4）通过光储DC/AC变换控制器实时采集直流侧电容电压信号Udc以及配电网18的三相电压uta、utb、utc和电流信号ia、ib、ic，通过计算和处理后形成光储逆变驱动信号，执行对光储DC/AC变换器的控制过程。(4) Real-time acquisition of the DC side capacitor voltage signal Udc and the three-phase voltages u ta , u tb , u tc and current signals ia , ib , ic of the distribution network 18 through the optical storage DC/AC conversion controller, through After calculation and processing, an optical-storage inverter drive signal is formed, and the control process of the optical-storage DC/AC converter is executed.

由上述技术方案可知，本发明通过V/Q下垂特性曲线控制光储DC/AC变换器输出的无功功率，达到稳定配电网电压的目标，并通过V/P下垂特性曲线控制储能DC/DC变换器发出或吸收有功功率，达到进一步稳定配电网电压的目的。这样可以充分利用有功功率和无功功率的变化对配电网电压的影响规律来控制电压，由此可以有效的抑制配电网电压越限，提高电压稳定性。It can be seen from the above technical scheme that the present invention controls the reactive power output by the optical storage DC/AC converter through the V/Q droop characteristic curve to achieve the goal of stabilizing the distribution network voltage, and controls the energy storage DC through the V/P droop characteristic curve The /DC converter emits or absorbs active power to further stabilize the voltage of the distribution network. In this way, the influence law of the change of active power and reactive power on the distribution network voltage can be fully utilized to control the voltage, thereby effectively suppressing the voltage limit of the distribution network and improving voltage stability.

附图说明Description of drawings

图1是本发明的配电网分布式光储系统的原理结构示意图；Fig. 1 is a schematic diagram of the principle structure of the distribution network distributed optical storage system of the present invention;

图2是本发明的储能DC/DC变换控制器原理结构示意图；Fig. 2 is a schematic structural diagram of the principle structure of the energy storage DC/DC conversion controller of the present invention;

图3是本发明的V/P下垂控制器原理结构示意图；Fig. 3 is a schematic structural diagram of the V/P drooping controller principle of the present invention;

图4是本发明的光储DC/AC变换控制器原理结构示意图；Fig. 4 is a schematic structural diagram of the principle structure of the optical storage DC/AC conversion controller of the present invention;

图5是本发明的无功功率控制器原理结构示意图；Fig. 5 is a schematic diagram of the principle structure of the reactive power controller of the present invention;

图6是本发明的V/Q下垂控制器原理结构示意图。Fig. 6 is a schematic diagram of the principle structure of the V/Q droop controller of the present invention.

具体实施方式Detailed ways

下面结合附图对本发明做进一步说明：The present invention will be further described below in conjunction with accompanying drawing:

如图1所示，本实施例的基于分布式光储系统的配电网电压控制系统，包括将太阳能转化为电能的光伏电池板11，将直流电压转化为更高直流电压的光伏DC/DC变换器12，将电能进行储存直流侧电容13，将电能储存或者释放的储能电池组15，吸收直流侧电容电能或者对外放电的储能DC/DC变换器16，将直流电压转化为交流电压的光储DC/AC变换器14，对所输出的交流电压进行滤波处理的滤波器17，配电网18。光伏DC/DC变换器12的输入端与光伏电池板11连接，光伏DC/DC变换器12的输出端经直流侧电容13与光储DC/AC变换器14的输入端连接，光储DC/AC变换器14的输出端经滤波器17与配电网18连接，储能DC/DC变换器12的输入端与电池组15连接，储能DC/DC变换器12的输出端与光储DC/AC变换器14的输入端连接。As shown in Figure 1, the distribution network voltage control system based on the distributed optical storage system of this embodiment includes a photovoltaic panel 11 that converts solar energy into electrical energy, and a photovoltaic DC/DC that converts DC voltage into a higher DC voltage. Converter 12, DC side capacitor 13 for storing electric energy, energy storage battery pack 15 for storing or releasing electric energy, energy storage DC/DC converter 16 for absorbing DC side capacitor electric energy or discharging externally, converting DC voltage into AC voltage The optical-storage DC/AC converter 14, the filter 17 for filtering the output AC voltage, and the distribution network 18. The input end of the photovoltaic DC/DC converter 12 is connected to the photovoltaic cell panel 11, the output end of the photovoltaic DC/DC converter 12 is connected to the input end of the optical storage DC/AC converter 14 through the DC side capacitor 13, and the optical storage DC/AC The output end of the AC converter 14 is connected to the distribution network 18 through the filter 17, the input end of the energy storage DC/DC converter 12 is connected to the battery pack 15, and the output end of the energy storage DC/DC converter 12 is connected to the optical storage DC / AC converter 14 input connection.

储能DC/DC变换控制器3，用于实时采集光伏电池板11输出电压Ucell和电流信号Icell、储能电池组15输出电压Upv和电流信号Ipv、以及配电网18三相电压信号uta、utb、utc，通过信号处理后形成储能驱动信号30，然后执行对储能DC/DC变换器16的控制过程。The energy storage DC/DC conversion controller 3 is used to collect the output voltage U cell and current signal I cell of the photovoltaic panel 11 in real time, the output voltage U pv and current signal I pv of the energy storage battery pack 15, and the three-phase power distribution network 18 The voltage signals u ta , u tb , and u tc are processed to form an energy storage drive signal 30 , and then the control process of the energy storage DC/DC converter 16 is executed.

光储DC/AC变换控制器2，用于实时采集直流侧电容电压信号Udc以及配电网18三相电压uta、utb、utc和电流信号ia、ib、ic，通过计算和处理后形成光储逆变驱动信号20，然后执行对光储DC/AC变换器14的控制过程。The optical storage DC/AC conversion controller 2 is used for real-time acquisition of the DC side capacitor voltage signal U dc and the three-phase voltage u ta , u tb , u tc of the distribution network 18 and current signals i a , i b , i c , through After calculation and processing, the optical-storage inverter driving signal 20 is formed, and then the control process of the optical-storage DC/AC converter 14 is executed.

如图2所示，储能DC/DC变换控制器3包括配电网电压幅值计算器31、光伏电池板输出有功功率计算器36、储能电池组输出有功功率计算器37、V/P下垂控制器32、减法器33、减法器34、比例积分器35。As shown in Figure 2, the energy storage DC/DC conversion controller 3 includes a distribution network voltage amplitude calculator 31, a photovoltaic panel output active power calculator 36, an energy storage battery pack output active power calculator 37, a V/P Droop controller 32 , subtractor 33 , subtractor 34 , proportional integrator 35 .

配电网电压幅值计算器31的输入端与配电网18连接，光伏电池板输出有功功率计算器36的输入端与电池板11的输出端连接，储能电池组输出有功功率计算器36的输入端与电池组15的输出端连接，配电网电压幅值计算器31的输出端与V/P下垂控制器32的输入端连接，V/P下垂控制器32、光伏电池板输出有功功率计算器36的输出端与减法器33的输入端连接，减法器33及储能电池组输出有功功率计算器37的输出端与减法器34的输入端连接，减法器34的输出端与比例积分器35的输入端连接，比例积分器35的输出端与储能DC/DC变换器16的控制端连接。The input end of the distribution network voltage amplitude calculator 31 is connected to the distribution network 18, the input end of the photovoltaic panel output active power calculator 36 is connected to the output end of the battery panel 11, and the energy storage battery pack output active power calculator 36 The input end of the battery pack 15 is connected, the output end of the distribution network voltage amplitude calculator 31 is connected with the input end of the V/P drooping controller 32, and the V/P drooping controller 32 and the photovoltaic panel output active power The output end of power calculator 36 is connected with the input end of subtractor 33, and the output end of subtractor 33 and energy storage battery group output active power calculator 37 is connected with the input end of subtractor 34, and the output end of subtractor 34 is proportional to The input terminal of the integrator 35 is connected, and the output terminal of the proportional integrator 35 is connected with the control terminal of the energy storage DC/DC converter 16 .

其中，电网电压幅值计算器31用于实时采集配电网三相电压信号uta、utb、utc，并基于采集值通过计算得到配电网电压幅值信号310；V/P下垂控制器32接收配电网电压幅值信号310经过下垂计算和信号处理得到光储系统有功功率参考信号320；光伏电池板输出有功功率计算器36用于实时采集光伏电池板输出电压Upv和电流Ipv信号，并基于采集值通过计算得到光伏电池板输出有功功率信号360；储能电池组输出有功功率计算器37用于实时采集储能电池组输出电压Ucell和电流Icell信号，并基于采集值通过计算得到储能电池组输出有功功率信号370；第一减法器33接收光储系统有功功率参考信号320和光伏电池板输出有功功率信号360，通过减法运算得到储能电池组有功功率参考信号330；第二减法器34接收储能电池组有功功率参考信号330和储能电池组输出有功功率信号370，通过减法运算得到储能电池组有功功率误差信号340；比例积分器35接收储能电池组有功功率误差信号340，通过比例积分运算得到驱动信号30，以驱动储能DC/DC变换器16。Among them, the grid voltage amplitude calculator 31 is used to collect the three-phase voltage signals u ta , u tb , u tc of the distribution network in real time, and obtain the voltage amplitude signal 310 of the distribution network through calculation based on the collected values; V/P droop control The device 32 receives the distribution network voltage amplitude signal 310 and obtains the active power reference signal 320 of the optical storage system through droop calculation and signal processing; the photovoltaic panel output active power calculator 36 is used to collect the photovoltaic panel output voltage U pv and current I in real time pv signal, and based on the collected value, the photovoltaic panel output active power signal 360 is obtained through calculation; the energy storage battery pack output active power calculator 37 is used to collect the output voltage U cell and current I cell signal of the energy storage battery pack in real time, and based on the collected The value is calculated to obtain the output active power signal 370 of the energy storage battery pack; the first subtractor 33 receives the active power reference signal 320 of the optical storage system and the active power signal 360 output by the photovoltaic panel, and obtains the active power reference signal of the energy storage battery pack through subtraction 330; the second subtractor 34 receives the energy storage battery pack active power reference signal 330 and the energy storage battery pack output active power signal 370, and obtains the energy storage battery pack active power error signal 340 through subtraction; the proportional integrator 35 receives the energy storage battery pack The group active power error signal 340 is used to obtain the drive signal 30 through proportional integral calculation to drive the energy storage DC/DC converter 16 .

如图3所示，V/P下垂控制器32包括有功功率上限控制器321、有功功率上段下垂控制器322、有功钳位控制器323、有功功率下段下垂控制器324、有功功率下限控制器325、加法器3251。该有功功率上限控制器321、有功功率上段下垂控制器322、有功钳位控制器323、有功功率下段下垂控制器324、有功功率下限控制器325均与加法器3251的输入端连接，加法器3251的输出端与减法器33的输入端连接；As shown in Figure 3, the V/P droop controller 32 includes an active power upper limit controller 321, an active power upper-stage droop controller 322, an active power clamp controller 323, an active power lower-stage droop controller 324, and an active power lower-limit controller 325. , Adder 3251. The active power upper limit controller 321, active power upper-stage droop controller 322, active power clamp controller 323, active power lower-stage droop controller 324, and active power lower-limit controller 325 are all connected to the input end of the adder 3251, and the adder 3251 The output end of is connected with the input end of subtractor 33;

其中，有功功率上限控制器321实时采集配电网电压幅值信号310，如果该信号小于或等于Vmin，则有功功率上限控制器321输出有功功率参考信号Pmax，如果该信号大于Vmax，则有功功率上限控制器321输出为0；有功功率上段下垂控制器322实时采集配电网电压幅值信号310，如果该信号大于Vmin并小于或等于V1，则有功功率上段下垂控制器322根据V/P下垂特性曲线来输出有功功率参考信号P1，否则，输出为0；有功钳位控制器323实时采集配电网电压幅值信号310，如果该信号310大于V1并小于或等于V2，则有功钳位控制器323输出恒定的有功功率参考信号Po，否则，输出为0；有功功率下段下垂控制器324实时采集配电网电压幅值信号310，如果该信号310大于V2并小于或等于Vmax，则有功功率下段下垂控制器324根据V/P下垂特性曲线来输出有功功率参考信号P2，否则，输出为0；有功功率下限控制器325实时采集配电网电压幅值信号310，如果该信号310大于Vmax，则有功功率下限控制器325输出有功功率参考信号Pmin。加法器3251用于接收有功功率上限控制器321、有功功率上段下垂控制器322、有功钳位控制器323、有功功率下段下垂控制器324、有功功率下限控制器325的输出信号326、327、328、329和3250，经过加法计算得到光储系统有功功率参考信号320。Among them, the active power upper limit controller 321 collects the voltage amplitude signal 310 of the distribution network in real time. If the signal is less than or equal to V min , the active power upper limit controller 321 outputs the active power reference signal P max . If the signal is greater than V max , Then the output of the active power upper limit controller 321 is 0; the upper active power droop controller 322 collects the distribution network voltage amplitude signal 310 in real time, if the signal is greater than V min and less than or equal to V 1 , the active power upper droop controller 322 Output the active power reference signal P 1 according to the V/P droop characteristic curve, otherwise, the output is 0; the active power clamp controller 323 collects the distribution network voltage amplitude signal 310 in real time, if the signal 310 is greater than V 1 and less than or equal to V 2 , the active clamp controller 323 outputs a constant active power reference signal P o , otherwise, the output is 0; the active power droop controller 324 collects the distribution network voltage amplitude signal 310 in real time, if the signal 310 is greater than V 2 and less than or equal to V max , then the lower active power droop controller 324 outputs the active power reference signal P 2 according to the V/P droop characteristic curve, otherwise, the output is 0; the active power lower limit controller 325 collects the distribution network voltage in real time Amplitude signal 310 , if the signal 310 is greater than V max , the active power lower limit controller 325 outputs an active power reference signal P min . The adder 3251 is used to receive the output signals 326, 327, 328 of the active power upper limit controller 321, the active power upper droop controller 322, the active clamp controller 323, the active power lower droop controller 324, and the active power lower limit controller 325 , 329 and 3250, the active power reference signal 320 of the optical storage system is obtained through addition calculation.

本实施例的电压Vmin设定为0.9倍的额定电压值，电压Vmax设定为1.1倍的额定电压值。并且所述V/P下垂特性曲线为非对称式下垂曲线，有功功率差值Pmax-Po大于有功功率差值Po-Pmin。In this embodiment, the voltage V min is set to be 0.9 times the rated voltage value, and the voltage V max is set to be 1.1 times the rated voltage value. In addition, the V/P droop characteristic curve is an asymmetric droop curve, and the active power difference P max -P o is greater than the active power difference P o -P min .

如图4所示，光储DC/AC变换控制器2包括直流电压控制器21、无功功率控制器26、电流控制器23，锁相环29和DC/AC变换驱动信号生成器25。As shown in FIG. 4 , the optical storage DC/AC conversion controller 2 includes a DC voltage controller 21 , a reactive power controller 26 , a current controller 23 , a phase-locked loop 29 and a DC/AC conversion drive signal generator 25 .

该直流电压控制器21的输入端并联在直流侧电容13的两端，无功功率控制器26的输入端与配电网18连接，直流电压控制器21及无功功率控制器26的输出端与电流控制器23的输入端连接，电流控制器23的输出端与DC/AC变换驱动信号生成器25的输入端连接，DC/AC变换驱动信号生成器25的输出端与光储DC/AC变换器14的控制端连接，该锁相环29的输入端与无功功率控制器26的输入端连接，锁相环29的输出端与电流控制器23的输入端连接。The input end of this DC voltage controller 21 is connected in parallel at the two ends of DC side capacitor 13, the input end of reactive power controller 26 is connected with distribution network 18, the output end of DC voltage controller 21 and reactive power controller 26 It is connected with the input end of the current controller 23, the output end of the current controller 23 is connected with the input end of the DC/AC conversion drive signal generator 25, and the output end of the DC/AC conversion drive signal generator 25 is connected with the optical storage DC/AC The control terminal of the converter 14 is connected, the input terminal of the phase-locked loop 29 is connected with the input terminal of the reactive power controller 26 , and the output terminal of the phase-locked loop 29 is connected with the input terminal of the current controller 23 .

其中，直流电压控制器21接收直流电容电压信号Udc和直流电压参考信号Udcref，通过计算和处理输出d轴电流参考信号22，并将d轴电流参考信号22输出至电流控制器23；无功功率控制器26接收配电网三相电压uta、utb、utc和电流信号ia、ib、ic，通过计算和处理得到q轴电流参考信号27，并将q轴电流参考信号27输出至电流控制器23；锁相环29接收配电网三相电压信号uta、utb、utc，通过锁相控制得到电压相位信号28并输送至电流控制器23；电流控制器23接收d轴电流参考信号22、q轴电流参考信号27、配电网三相电流信号ia、ib、ic和电压相位信号28，通过计算和处理得到调制信号24，并将调制信号24输送至DC/AC变换驱动信号生成器25；DC/AC变换驱动信号生成器25根据所接收的调制信号24得到驱动信号20，并将驱动信号20输送至DC/AC变换器14。Wherein, the DC voltage controller 21 receives the DC capacitor voltage signal U dc and the DC voltage reference signal U dcref , outputs the d-axis current reference signal 22 through calculation and processing, and outputs the d-axis current reference signal 22 to the current controller 23; The power controller 26 receives the distribution network three-phase voltages u ta , u tb , u tc and current signals ia , i b , i c , obtains the q-axis current reference signal 27 through calculation and processing, and uses the q-axis current reference The signal 27 is output to the current controller 23; the phase-locked loop 29 receives the three-phase voltage signals u ta , u tb , u tc of the distribution network, and obtains the voltage phase signal 28 through phase-locking control and sends it to the current controller 23; the current controller 23 receives the d-axis current reference signal 22, the q-axis current reference signal 27, the distribution network three-phase current signals i a , i b , i c and the voltage phase signal 28, obtains the modulation signal 24 through calculation and processing, and converts the modulation signal 24 is sent to the DC/AC conversion driving signal generator 25; the DC/AC conversion driving signal generator 25 obtains the driving signal 20 according to the received modulation signal 24, and sends the driving signal 20 to the DC/AC converter 14.

如图5所示，无功功率控制器26包括电压幅值计算器261，V/Q下垂控制器263、无功功率计算器268、减法器265、比例积分器267；电压幅值计算器261的输入端与配电网18连接，电压幅值计算器261的输出端与V/Q下垂控制器263的输入端连接，V/Q下垂控制器263的输出端及无功功率计算器268的输出端与减法器265的输入端连接，减法器265的输出端与比例积分器267的输入端连接，比例积分器267的输出端与电流控制器23的输入端连接。As shown in Figure 5, the reactive power controller 26 includes a voltage amplitude calculator 261, a V/Q droop controller 263, a reactive power calculator 268, a subtractor 265, a proportional integrator 267; a voltage amplitude calculator 261 The input end of the voltage amplitude calculator 261 is connected to the input end of the V/Q droop controller 263, and the output end of the V/Q droop controller 263 is connected to the reactive power calculator 268. The output terminal is connected to the input terminal of the subtractor 265 , the output terminal of the subtractor 265 is connected to the input terminal of the proportional integrator 267 , and the output terminal of the proportional integrator 267 is connected to the input terminal of the current controller 23 .

该电压幅值计算器261，用于接收配电网三相电压信号uta、utb、utc经过计算得到电压幅值信号262，并输送至V/Q下垂控制器263；V/Q下垂控制器263，用于接收电压幅值信号262，通过V/Q下垂特性曲线计算得到无功功率参考信号264，并输送至减法器265；无功功率计算器268，用于接收三相电压uta、utb、utc和电流信号ia、ib、ic，经过计算得到无功功率信号269，并输送至减法器265；减法器265接收无功功率参考信号264和无功功率信号269，将两者作减法运算得到无功功率误差值266，并将计算结果输送至比例积分器267；比例积分器267，用于接收无功功率误差值266，通过计算和处理得到q轴电流参考信号27。The voltage amplitude calculator 261 is used to receive the three-phase voltage signals u ta , u tb , and u tc of the distribution network to obtain a voltage amplitude signal 262 after calculation, and send it to the V/Q droop controller 263; V/Q droop The controller 263 is used to receive the voltage amplitude signal 262, calculate the reactive power reference signal 264 through the V/Q droop characteristic curve, and send it to the subtractor 265; the reactive power calculator 268 is used to receive the three-phase voltage u ta , u tb , u tc and current signals ia , ib , ic are calculated to obtain reactive power signal 269 and sent to subtractor 265; subtractor 265 receives reactive power reference signal 264 and reactive power signal 269, the two are subtracted to obtain the reactive power error value 266, and the calculation result is sent to the proportional integrator 267; the proportional integrator 267 is used to receive the reactive power error value 266, and obtain the q-axis current through calculation and processing Reference signal 27.

如图6所示，V/Q下垂控制器263包括无功功率上限控制器201、无功功率上段下垂控制器202、无功钳位控制器203、无功功率下段下垂控制器204、无功功率下限控制器205、加法器2092。As shown in Figure 6, the V/Q droop controller 263 includes a reactive power upper limit controller 201, a reactive power upper droop controller 202, a reactive power clamp controller 203, a reactive power lower droop controller 204, and a reactive power droop controller 204. Power lower limit controller 205, adder 2092.

其中，无功功率上限控制器201，用于实时采集配电网电压幅值信号262，如果该信号262小于或等于Vmin，则无功功率上限控制器201输出无功功率参考信号Qmax，如果该信号262大于Vmax，则无功功率上限控制器201输出为0；无功功率上段下垂控制器202，用于实时采集配电网电压幅值信号262，如果该信号262大于Vmin并小于或等于VQ1，则无功功率上段下垂控制器202根据V/Q下垂特性曲线来输出无功功率参考信号Q1，否则，输出为0；无功钳位控制器203，用于实时采集配电网电压幅值信号262，如果该信号262大于VQ1并小于或等于VQ2，则无功钳位控制器203输出为0；无功功率下段下垂控制器204，用于实时采集配电网电压幅值信号262，如果该信号262大于VQ2并小于或等于Vmax，则无功功率下段下垂控制器204根据V/Q下垂特性曲线来输出无功功率参考信号Q2，否则，输出为0；无功功率下限控制器205，用于实时采集配电网电压幅值信号262，如果该信号262大于Vmax，则无功功率下限控制器205输出无功功率参考信号Qmin。加法器2092，用于接收无功功率上限控制器201、无功功率上段下垂控制器202、无功钳位控制器203、无功功率下段下垂控制器204、无功功率下限控制器205的输出信号206、207、208、209、2091，经过加法计算得到光储系统无功功率参考信号264。Among them, the reactive power upper limit controller 201 is used to collect the distribution network voltage amplitude signal 262 in real time. If the signal 262 is less than or equal to V min , the reactive power upper limit controller 201 outputs a reactive power reference signal Q max , If this signal 262 is greater than V max , then the output of the reactive power upper limit controller 201 is 0; the upper section of reactive power drooping controller 202 is used to collect the distribution network voltage amplitude signal 262 in real time, if the signal 262 is greater than V min and is less than or equal to V Q1 , then the reactive power upper stage droop controller 202 outputs the reactive power reference signal Q 1 according to the V/Q droop characteristic curve, otherwise, the output is 0; the reactive power clamp controller 203 is used for real-time acquisition Distribution network voltage amplitude signal 262, if the signal 262 is greater than V Q1 and less than or equal to V Q2 , the output of the reactive power clamping controller 203 is 0; the reactive power drooping controller 204 is used for real-time collection of power distribution grid voltage amplitude signal 262, if the signal 262 is greater than V Q2 and less than or equal to V max , then the reactive power droop controller 204 outputs the reactive power reference signal Q 2 according to the V/Q droop characteristic curve, otherwise, outputs is 0; the reactive power lower limit controller 205 is used to collect the distribution network voltage amplitude signal 262 in real time, and if the signal 262 is greater than V max , the reactive power lower limit controller 205 outputs a reactive power reference signal Q min . The adder 2092 is used to receive the output of the reactive power upper limit controller 201, the reactive power upper-stage droop controller 202, the reactive power clamp controller 203, the reactive power lower-stage droop controller 204, and the reactive power lower limit controller 205 The signals 206, 207, 208, 209, and 2091 are added and calculated to obtain the reactive power reference signal 264 of the optical storage system.

本实施例的，无功功率参考信号Qmax为最大有功参考信号，无功功率参考信号Qmin为最小无功参考信号，并且Qmax的绝对值大于Qmin的绝对值。In this embodiment, the reactive power reference signal Q max is the maximum active reference signal, the reactive power reference signal Q min is the minimum reactive reference signal, and the absolute value of Q max is greater than the absolute value of Q min .

以上所述的实施例仅仅是对本发明的优选实施方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案作出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (9)

1. A power distribution network voltage control system based on a distributed optical storage system is characterized in that: the photovoltaic power generation system comprises a photovoltaic cell panel, a photovoltaic DC/DC converter, a direct-current side capacitor, an energy storage battery pack, an energy storage DC/DC converter, an energy storage DC/DC conversion controller and an optical storage DC/AC converter, wherein the input end of the photovoltaic DC/DC converter is connected with the cell panel, the output end of the photovoltaic DC/DC converter is connected with the input end of the optical storage DC/AC converter through the direct-current side capacitor, the output end of the optical storage DC/AC converter is connected with a power distribution network through a filter, the input end of the energy storage DC/DC converter is connected with the battery pack, and the output end of the optical storage DC/AC converter is connected with the input end of the optical storage DC/AC converter;
the input end of the energy storage DC/DC conversion controller is connected with the output end of the battery pack, the output end of the battery panel and the power distribution network, the output end of the energy storage DC/DC conversion controller is connected with the control end of the energy storage DC/DC converter and is used for detecting voltage and current signals output by the photovoltaic battery panel, voltage and current signals output by the energy storage battery pack and three-phase voltage signals of the power distribution network, and an energy storage driving signal is formed after signal processing so as to regulate the energy storage DC/DC converter;
the input end of the optical storage DC/AC conversion controller is connected with the power distribution network and the direct current side capacitor, the output end of the optical storage DC/AC conversion controller is connected with the control end of the optical storage DC/AC converter and is used for detecting direct current side capacitor voltage signals and three-phase voltage and current signals of the power distribution network, and an optical storage inversion driving signal is formed after calculation and processing so as to regulate the optical storage DC/AC converter;
the energy storage DC/DC conversion controller comprises a power distribution network voltage amplitude calculator, a photovoltaic cell panel output active power calculator, an energy storage battery pack output active power calculator, a V/P sagging controller, a first subtracter, a second subtracter and a proportional integrator;
the input end of the power distribution network voltage amplitude calculator is connected with the power distribution network, the input end of the photovoltaic cell panel output active power calculator is connected with the output end of the battery panel, the input end of the energy storage battery pack output active power calculator is connected with the output end of the battery pack, the output end of the power distribution network voltage amplitude calculator is connected with the input end of the V/P droop controller, the output ends of the V/P droop controller and the photovoltaic cell panel output active power calculator are connected with the input end of the first subtracter, the output ends of the first subtracter and the energy storage battery pack output active power calculator are connected with the input end of the second subtracter, the output end of the second subtracter is connected with the input end of the proportional integrator, and the output end of the proportional integrator is connected with the control end of the energy storage DC/DC converter;
the optical storage DC/AC conversion controller comprises a direct-current voltage controller, a reactive power controller, a current controller, a phase-locked loop and a DC/AC conversion driving signal generator.
2. The distributed optical storage system-based power distribution network voltage control system according to claim 1, wherein:
the power grid voltage amplitude calculator is used for collecting three-phase voltage signals of the power distribution network in real time and calculating to obtain voltage amplitude signals of the power distribution network;
the V/P droop controller is used for receiving the voltage amplitude signal of the power distribution network and obtaining an active power reference signal of the optical storage system through droop calculation and signal processing;
the photovoltaic cell panel output active power calculator is used for collecting photovoltaic cell panel output voltage and current signals in real time and obtaining photovoltaic cell panel output active power signals through calculation;
the energy storage battery pack output active power calculator is used for collecting output voltage and current signals of the energy storage battery pack in real time and obtaining the output active power signals of the energy storage battery pack through calculation;
the first subtracter is used for receiving the active power reference signal of the optical storage system and the active power signal output by the photovoltaic cell panel, and obtaining an active power reference signal of the energy storage battery pack through operation;
the second subtracter is used for receiving the active power reference signal of the energy storage battery pack and the active power signal output by the energy storage battery pack, and obtaining an active power error signal of the energy storage battery pack through operation;
the proportional integrator is used for receiving the active power error signal of the energy storage battery pack and obtaining a DC/DC converter driving signal through operation.
3. The distributed optical storage system-based power distribution network voltage control system according to claim 1, wherein: the V/P droop controller comprises an active power upper limit controller, an active power upper section droop controller, an active clamp controller, an active power lower section droop controller, an active power lower limit controller and a first adder; the input ends of the active power upper limit controller, the active power upper section droop controller, the active clamp controller, the active power lower section droop controller and the active power lower limit controller are connected with the output end of the power distribution network voltage amplitude calculator, the output ends of the active power upper limit controller, the active power upper section droop controller, the active clamp controller and the active power lower section droop controller are connected with the input end of a first adder, and the output end of the first adder is connected with the input end of a first subtracter;
the active power upper limit controller is used for collecting a voltage amplitude signal of the power distribution network if the signal is smallAt or equal to V min Then output the active power reference signal P max If the signal is greater than V max The output is 0;
the active power upper section sagging controller is used for collecting a voltage amplitude signal of the power distribution network, and if the signal is larger than V min And is less than or equal to V 1 Outputting an active power reference signal P according to the V/P droop characteristic 1 Otherwise, the output is 0;
the active clamp controller is used for collecting voltage amplitude signals of the power distribution network in real time, and if the voltage amplitude signals are larger than V 1 And is less than or equal to V 2 Then a constant active power reference signal P is output o Otherwise, the output is 0;
the active power lower section droop controller is used for collecting a voltage amplitude signal of the power distribution network, if the signal is greater than V 2 And is less than or equal to V max Outputting an active power reference signal P according to the V/P droop characteristic 2 Otherwise, the output is 0;
the active power lower limit controller is used for collecting a voltage amplitude signal of the power distribution network, and if the signal is greater than V max Then output the active power reference signal P min Otherwise, the output is 0;
the first adder is configured to receive output signals of the active power upper limit controller, the active power upper segment droop controller, the active clamp controller, the active power lower segment droop controller, and the active power lower limit controller, and perform addition calculation to obtain an active power reference signal of the optical storage system.
4. A distributed optical storage system-based power distribution network voltage control system as claimed in claim 3, wherein: the active power reference signal P max As the maximum active reference signal, the active power reference signal P min Is the minimum active reference signal; said voltage V min Set to 0.9 times of rated voltage value, voltage V max Setting the rated voltage value to be 1.1 times; the V/P sagging characteristic curve is an asymmetric sagging curve, and the active power difference value P max -P o Greater than the active power difference P o -P min 。
5. The distributed optical storage system-based power distribution network voltage control system according to claim 1, wherein:
the input end of the direct current voltage controller is connected in parallel with the two ends of the direct current side capacitor, the input end of the reactive power controller is connected with the power distribution network, the output ends of the direct current voltage controller and the reactive power controller are connected with the input end of the current controller, the output end of the current controller is connected with the input end of the DC/AC conversion driving signal generator, the output end of the DC/AC conversion driving signal generator is connected with the control end of the light storage DC/AC converter, the input end of the phase-locked loop is connected with the input end of the reactive power controller, and the output end of the phase-locked loop is connected with the input end of the current controller.
6. The distributed optical storage system-based power distribution network voltage control system according to claim 5, wherein:
the direct-current voltage controller is used for receiving a direct-current capacitor voltage signal and a direct-current voltage reference signal and outputting a d-axis current reference signal through calculation;
the reactive power controller is used for receiving three-phase voltage and current signals of the power distribution network and obtaining a q-axis current reference signal through calculation;
the phase-locked loop is used for receiving three-phase voltage signals of the power distribution network and calculating to obtain voltage phase signals;
the current controller is used for receiving a d-axis current reference signal, a q-axis current reference signal, a three-phase current signal and a voltage phase signal of the power distribution network, and obtaining a modulation signal through calculation;
the DC/AC conversion driving signal generator is used for obtaining a driving signal according to the received modulation signal and transmitting the driving signal to the optical storage DC/AC converter.
7. The distributed optical storage system-based power distribution network voltage control system according to claim 5, wherein: the reactive power controller comprises a voltage amplitude calculator, a V/Q droop controller, a reactive power calculator, a third subtracter and a proportional integrator;
the voltage amplitude calculator is used for receiving three-phase voltage signals of the power distribution network and obtaining voltage amplitude signals through calculation;
the V/Q droop controller is used for receiving the voltage amplitude signal and calculating a reactive power reference signal through a V/Q droop characteristic curve;
the reactive power calculator is used for receiving three-phase voltage and current signals of the power distribution network and obtaining reactive power signals through calculation;
the third subtracter is used for receiving the reactive power reference signal and the reactive power signal, and subtracting the reactive power reference signal and the reactive power signal to obtain a reactive power error value;
the proportional integrator is used for receiving the reactive power error value and obtaining a q-axis current reference signal through calculation and processing.
8. The distributed optical storage system-based power distribution network voltage control system as claimed in claim 7, wherein: the V/Q droop controller comprises a reactive power upper limit controller, a reactive power upper section droop controller, a reactive clamp controller, a reactive power lower section droop controller, a reactive power lower limit controller and a second adder, wherein the input ends of the reactive power upper limit controller, the reactive power upper section droop controller, the reactive clamp controller, the reactive power lower section droop controller and the reactive power lower limit controller are all connected with the output end of the voltage amplitude calculator, the output end of the reactive power upper section droop controller, the reactive clamp controller, the reactive power lower section droop controller and the output end of the reactive power lower limit controller are all connected with the input end of the second adder, and the output end of the second adder is connected with the input end of the third subtractor.
9. The method for controlling a voltage control system of a power distribution network based on a distributed optical storage system according to claim 1, comprising the steps of:
(1) Converting the direct-current voltage output by the battery plate into high direct-current voltage through a photovoltaic DC/DC converter, and storing the converted electric energy through a direct-current side capacitor;
(2) The energy storage DC/DC converter is used for absorbing the electric energy of the capacitor at the direct current side, the light storage DC/AC converter is used for converting the direct current voltage output by the photovoltaic DC/DC converter into alternating current voltage, and the alternating current voltage is input to the power distribution network after filtering;
(3) Output voltage U of photovoltaic cell panel is acquired in real time through energy storage DC/DC conversion controller cell And current signal I cell Output voltage U of energy storage battery pack pv And current signal I pv Three-phase voltage signal u of power distribution network 18 ta 、u tb 、u tc Forming an energy storage driving signal after signal processing, and executing control on the energy storage DC/DC converter;
(4) The DC side capacitance voltage signal U is acquired in real time through the optical storage DC/AC conversion controller dc Three-phase voltage u of distribution network 18 ta 、u tb 、u tc And a current signal i a 、i b 、i c And performing a control process of the optical storage DC/AC converter by calculating and processing to form an optical storage inversion driving signal.
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