【摘要】 针对采用常规下垂控制方法的逆变电源存在稳定时电压和频率的偏移,不能完全满足电网运行要求的问题,采用了一种新的逆变电源控制方法即虚拟同步发电机(VSG)控制策略。建立了虚拟同步发电机的模型,参考同步发电机控制理论,重点设计了功频控制器和励磁控制器,搭建了以大容量汽轮发电机模拟电网的逆变器并网发电系统。通过Matlab/Simulink仿真验证了虚拟同步发电机中转动惯量的作用和虚拟同步发电机的并网调节特性,仿真结果表明,基于虚拟同步发电机的逆变电源在外特性上近似等效为一个同步发电机,具有良好的调频调压性能,能很好地适应电网的运行要求。更多还原

【Abstract】 Voltage and frequency deviation occur in the steady state in the inverters which adopts the conventional droop control method,which cannot completely meet the requirement of the grid operation. In view of this problem,a new control strategy of inverters called virtual synchronous generator( VSG) was adopted in this paper. A virtual synchronous generator model was established,a power frequency controller and an excitation controller were designed based on the control theory of the synchronous generator,and an inverter grid-connected power-generating system was constructed,which used a large capacity steam turbine generator to simulate the grid. The function of the rotational inertia and the grid-connected regulation characteristics of the virtual synchronous generator were verified through the Matlab / Simulink simulation. The simulation results showed that the inverter based on the virtual synchronous generator control strategy was approximately equivalent to a synchronous generator in external characteristics,which had excellent qualities of modulating frequency and voltage and could meet the requirement of the grid operation.更多还原