| 引用本文: | 胡文强,吴在军,孙充勃,宋毅,原凯.基于VSG的储能系统并网逆变器建模与参数整定方法[J].电力自动化设备,2018,(8): |
| HU Wenqiang,WU Zaijun,SUN Chongbo,SONG Yi,YUAN Kai.Modeling and parameter setting method for grid-connected inverter of energy storage system based on VSG[J].Electric Power Automation Equipment,2018,(8): |
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| 摘要: |
| 从并网逆变器主电路和同步发电机等效电路的对应关系出发，提出模拟同步发电机转子的运动方程、有功-频率下垂特性与无功-电压下垂特性的虚拟同步发电机(VSG)外环控制策略。引入虚拟阻抗模拟同步发电机定子电气方程的电压环，和基于准比例谐振控制器的电流环共同构成应用于储能系统并网逆变器的VSG控制策略。建立应用于储能系统并网逆变器的VSG动态小信号模型，分析其参与电网需求响应的机理。推导得出VSG参与电网调压/调频需求响应的动态模型，为研究电网电压/频率波动时VSG无功/有功输出特性提供依据；进而在保证有功环、无功环的稳定性与调压/调频动态性能的条件下，总结得到VSG关键参数的整定方法。最后通过仿真与实验验证了所提VSG参与电网调压/调频动态模型的正确性与参数整定方法的有效性。 |
| 关键词: 虚拟同步发电机 储能系统 并网逆变器 下垂特性 动态小信号模型 调压调频 参数整定 建模 |
| DOI：10.16081/j.issn.1006-6047.2018.08.003 |
| 分类号:TM464 |
| 基金项目:国家重点研发计划资助项目(2016YFB0900103)；国家电网公司科技项目(PD71-17-008) |
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| Modeling and parameter setting method for grid-connected inverter of energy storage system based on VSG |
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HU Wenqiang1, WU Zaijun1, SUN Chongbo2, SONG Yi2, YUAN Kai2
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1.School of Electrical Engineering, Southeast University, Nanjing 210096, China;2.State Grid Power Economic Research Institute, Beijing 102209, China
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| Abstract: |
| Starting from the corresponding relationship between the main circuit of grid-connected inverter and the equivalent circuit of synchronous generator, the outer loop control strategy of VSG(Virtual Synchronous Generator) is proposed to simulate the motion equation, active power-frequency droop characteristic and reactive power-voltage droop characteristic of the synchronous generator rotor. The virtual impedance is introduced to simulate the voltage loop of synchronous generator stator’s electrical equation, which, combined with the quasi proportional resonant controller-based current loop, forms the VSG control strategy for the grid-connected inverter of energy storage system. The dynamic small signal model of VSG applied to the grid-connected inverter is established to analyze the mechanism of its participation in the demand response of power grid. The dynamic models of VSG participating in voltage regulation and frequency regulation demand responses are deduced, which provide the basis for studying the reactive/active output characteristics of VSG under voltage/frequency fluctuations. Then, the method of setting the key parameters of VSG is summarized under the conditions of maintaining the stability of active power loop and reactive power loop and the dynamic performances of voltage regulation and frequency regulation. Finally, simulative and experimental results verify the validity of the dynamic models of VSG participating in voltage regulation and frequency regulation and the effectiveness of the parameter setting method. |
| Key words: virtual synchronous generator energy storage system grid-connected inverters droop characteristic dynamic small signal model voltage regulation and frequency regulation parameter setting model buildings |
