基于无功偏差带电压补偿的VSG环流抑制策略  

Strategy of Restraining Circulating Current of VSG Based on Voltage Compensation Considering Reactive Power Deviation

作　　者：冉宝春[1] 曹跃龙[1] 支娜[2] RAN Bao-chun;CAO Yue-ong;ZHI Na?(Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学,自动化与信息工程学院,陕西西安710048 [2]西安理工大学,电气工程学院,陕西百西安710048

出　　处：《电力电子技术》2023年第7期77-79,95,共4页Power Electronics

基　　金：国家自然科学基金(52077176)。

摘　　要：虚拟同步发电机(VSG)技术提升了微电网电力电子变换器惯性,降低了电压和电流的冲击幅值,提高了微电网稳定性,得到广泛应用。但线路阻抗参数不匹配会导致并联VSG无功功率分配准确度下降,在并联变换器间形成环流回路,针对并联VSG因线路参数不匹配引起的环流,提出一种考虑无功偏差带电压补偿的环流抑制策略,通过在电压控制环节引入电压补偿,跟随负荷变化调节电压补偿量、修正无功功率分配,抑制了并联VSG环流。仿真和实验结果表明所提策略提高了无功功率分配精度,降低了电压偏差,抑制了多机环流,实现了VSG多机友好互联。The virtual synchronous generator(VSG)technology improves the inertia of microgrid power electronic con-verters,reduces the impact amplitude of voltage and current,improves the stability of the microgrid,and is widely used.However,the mismatched line impedance parameters will lead to a decline in the accuracy of reactive power distribution of the parallel VSG,forming a loop between the parallel converters.For the loop caused by the mis-matched line parameters of the parallel VSG,a restraining circulating current suppression strategy considering reactive power deviation with voltage compensation is proposed.By introducing voltage compensation in the voltage control link,and adjusting the voltage compensation amount adaptively with the load,the reactive power distribution is correc-ed to suppress the circulating current of parallel VSG.The simulation and experimental results show that the proposed strategy improves the accuracy of reactive power distribution and reduces the voltage deviation,suppresses the multi-machine circulation,and realizes the friendly interconnection of VSG.

关 键 词：微电网 虚拟同步发电机 电压补偿 环流抑制 

分 类 号：V242.3[航空宇航科学与技术—飞行器设计]