【摘要】 微网系统中，如多台并网逆变器采用虚拟同步发电机(virtual synchronous generator, VSG)并联时，线路阻抗的差异将会导致无功功率无法正确按比例分配，甚至产生无功环流。虚拟阻抗法是目前公认最简单有效的功率分配策略，但其加入会导致电压控制精度的下降。基于此问题，本文对孤岛模式下的微电网系统提出采用VSG定子方程虚拟阻抗的无功功率均分策略，并结合自适应虚拟感抗与虚拟容抗相结合的控制方案，在保证有功、无功功率均分精度的同时，减小电压的跌落程度，并与常规的虚拟阻抗方法进行了对比分析。最后，利用MATLAB/Simulink进行仿真分析，结果表明所提控制策略对于功率均分精度和电压控制精度具有很好的控制效果。更多还原

【Abstract】 When multiple virtual synchronous generators(VSGs) are connected in parallel, the difference between the line impedance will not only cause the reactive power to be distributed by ratio, but cause reactive circulating current also. The virtual impedance method is currently the simplest and most effective power allocation strategy, but the addition of virtual impedance will lead to a decrease in voltage control accuracy. In order to solve the above problems, the paper proposed a reactive power sharing strategy based on VSG stator equation virtual impedance in island mode, combining the adaptive virtual inductive reactance and virtual capacitive reactance. The proposed method can ensure the power sharing accuracy, and reduce the drop in voltage in the same time. In order to verify the effectiveness of the method proposed, the paper studied some work conditions and compare it with the conventional virtual impedance method. The simulation analysis is carried out by using MATLAB/Simulink simulation software. The simulation results show that the proposed control strategy is effective for power sharing accuracy and voltage control accuracy.更多还原