摘要
三相不平衡负载会使逆变器中性点发生偏移,导致输出电压、电流产生畸变。不平衡负载工况下虚拟同步发电机(Virtual Synchronous Generator,VSG)的有效控制,对提高系统稳定性具有重要意义。提出一种改进的VSG分序控制策略,通过采用基于降阶谐振调节器(Reduced Order Resonant,ROR)的正负序分离技术,在传统VSG励磁控制策略基础上加入ROR调节器,以抑制输出电压中存在的二倍频波动分量。同时在电压电流双环中加入负序电压环,进一步控制负序电压分量。通过Matlab/Simulink搭建了单台VSG仿真模型,分析了不平衡负载下VSG输出电压不平衡机理和ROR调节器原理及特性,仿真结果验证了所提控制策略的有效性。
Three-phase unbalanced load will shift the neutral point of inverter,which will lead to distortion of output voltage and current.The effective control of virtual synchronous generator(VSG) under unbalanced load condition is of great significance to improve system stability.In this paper,an improved VSG sequence control strategy is proposed.By adopting the positive and negative sequence separation technology based on reduced order resonant regulator(ROR),ROR regulator was added to the traditional VSG excitation control strategy to suppress the second harmonic fluctuation component in the output voltage.At the same time,a negative sequence voltage loop was added to the voltage and current double loop to further control the negative sequence voltage component.A single VSG simulation model was built based on Matlab/Simulink,and the unbalanced mechanism of VSG output voltage under unbalanced load and the principle and characteristics of ROR regulator were analyzed.Simulation results verifies the effectiveness of the proposed control strategy.
作者
王辉
周子扬
吕维港
邾玢鑫
WANG Hui;ZHOU Zi-yang;Lü Wei-gang;ZHU Bin-xin(College of Electrical&.New Energy,China Three Gorges University,Yichang Hubei 443002,China;Hubei Institute of Microgrid Engineering Technology,China Three Gorges University,Yichang Hubei 443002,China)
出处
《计算机仿真》
北大核心
2022年第5期109-116,共8页
Computer Simulation
基金
国家自然科学基金资助项目(51707103)。
