基于自适应动态虚拟同步阻抗的虚拟同步机功率解耦策略  

Power Decoupling Strategy for Virtual Synchronous Generator Based on Adaptive Dynamic Virtual Synchronous Impedance

作　　者：张林 张海波 蒋维勇 李凯 ZHANG Lin;ZHANG Haibo;JIANG Weiyong;LI Kai(State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;State Grid Economic and Technical Research Institute,Changping District,Beijing 102209,China;State Grid Shandong Electric Power Company Economic and Technical Research Institute,Jinan 100038,Shandong Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国网经济技术研究院,北京市昌平区102209 [3]国网山东省电力公司经济技术研究院,山东省济南市100038

出　　处：《中国电机工程学报》2024年第15期6010-6022,I0014,共14页Proceedings of the CSEE

基　　金：国家电网有限公司科技项目(5108-202218280A-2-264-XG)。

摘　　要：虚拟同步机(virtual synchronous generator,VSG)在弱电网中易出现的大功角以及功率传输时线路存在高阻抗比的运行条件下,有功与无功功率间存在严重耦合,可能引起VSG功率稳态偏差、动态振荡甚至严重时引发系统失稳。通过建立虚拟同步机的宽频域功率耦合模型,采用动态相对增益阵列分析VSG功率耦合机理,并在此基础上,提出一种基于自适应动态虚拟同步阻抗的VSG功率解耦策略,能够动态地消除VSG功率环路之间的耦合。通过小信号模型的对比分析,证明该解耦策略能够有效提高VSG系统的稳定性。最后,通过PSCAD/EMTDC仿真验证所提方法不仅可以有效地消除功率耦合,而且可以进一步提高VSG系统的动态响应性能。When employed in operating scenarios where the weak grid is susceptible to significant power angle swings and the transmission lines exhibit a high impedance ratio,the virtual synchronous generator(VSG)encounters severe coupling between active and reactive power.This coupling can potentially lead to power steady-state errors,dynamic oscillations in the VSG,and in severe cases,even system instability.By establishing a wide frequency domain dynamic power coupling model of the virtual synchronous generator,the dynamic relative gain array is used to analyze the VSG power coupling mechanism.On this basis,a virtual synchronous generator power decoupling strategy based on adaptive dynamic virtual synchronous impedance is proposed,which can dynamically eliminate the coupling effect between VSG power loops.Through the comparative analysis of the small signal model,it is proved that the decoupling strategy can effectively improve the stability of the VSG system.Finally,the PSCAD/EMTDC simulation verifies that the proposed method can not only effectively eliminate the power coupling,but also further improve the VSG power dynamic response performance.

关 键 词：虚拟同步发电机 功率耦合 动态相对增益阵列 动态解耦 自适应虚拟阻抗 

分 类 号：TM71[电气工程—电力系统及自动化]