中文摘要：

针对虚拟同步发电机（VSG）有差控制的缺点,提出了一种采用集中控制方式的微网频率和电压二次调节方法。按照关于容量比的分配公式,将二次控制器产生的频率和电压调节量分配给各台VSG的功频和电压控制器,提供所需的功率缺额,实现多台VSG频率和电压的二次控制,弥补有差控制缺陷。在MATLAB/Simulink环境下构建2台VSG并联仿真模型,仿真结果验证了二次调节的有效性以及调节量分配原则的正确性;最后设计了小功率实验样机,所得到的并联VSG二次控制实验结果与理论分析和仿真结果一致。

英文摘要：

To overcome the shortcomings of error control of virtual synchronous generator（VSG）, we put forward a method of frequency and voltage secondary regulation for micro-grid. In accordance with the allocation formula about capacity ratio, frequency and voltage adjustment quantity generated by secondary controller are assigned to the controller of VSG to provide the required power, which can achieve zero-error control of frequency and voltage, and remedy the shortages of VSG control. Moreover, two parallel VSGs simulation models are built in MATLAB/Simulink. Simulation results show that the control strategy of secondary frequency and regulation quantity distribution principle for micro-grid proposed in this paper are correct and effective. At last, the experimentation of a low power test prototype of two parallel VSGs are designed, experimental results are consistent to theoretical and simulation results.