电网模拟器控制策略研究

Study on Control Strategy of Grid Simulator

为了提高电网模拟器的输出电压性能,文章提出了电感电流瞬时反馈控制和负载扰动前馈补偿相结合的控制方式,和新颖的电网模拟器整体的三相主电路拓扑结构。文中应用电网模拟器电压瞬时值外环、电感电流瞬时值内环的控制策略,具体分析了电感电流内环闭环、电压外环开环与闭环以及输出阻抗的频率特性,对内环闭环与外环闭环的阶跃响应进行了定量分析,并且给出了SPWM下的滤波器的设计方法,通过仿真验证了该理论方案的可行性,并且得到了符合电网模拟器基波输出性能要求的输出波形。

In order to improve the output voltage performance of grid simulator, the article proposes a control strategy utilizing both the instantaneous inductance current feedback and the load disturbance feed forward, and also puts forward a novel three phase main circuit topology for the grid simulator. It mainly applies the control strategy of the instantaneous voltage outer loop and the instantaneous current inner loop. The frequency characteristics of the output impedance and step response of the inner and outer loop are analyzed. Besides, design method of the filter under condition of SPWM control is given. The simulation results verify the feasibility of the theoretical scheme.