基于PI-QPR控制的双向变流器并网研究

Research on Grid Connection of Bidirectional Converter Based on PI-QPR Control

针对双向变流器在并网馈能过程中采用比例积分控制存在稳定性误差和系统扰动等问题,在传统的PI双闭环控制策略的基础上,设计了一种新型的双闭环复合控制方法,即在两相静止坐标系下将准比例谐振控制应用于电流内环控制,电压外环采用PI的控制策略;通过MATLAB/Simulink仿真,结果表明:采用该复合控制策略可以实现无静差控制,降低了双向变流器并网电流的谐波含量,系统具备良好的动态性能和鲁棒性能。

For the bidirectional converter,the proportional integral control in the process of grid-connected energy feeding has problems such as stability error and system disturbance.Based on the traditional PI double closed-loop control strategy,a new double closed-loop composite control method is designed,which applies the quasi-proportional resonance control to the current inner loop control in the two-phase stationary coordinate system,and the voltage outer loop adopts PI.Control Strategy.Through MATLAB/Simulink simulation,the results show that the composite control strategy can achieve no static difference control,reduce the harmonic content of the bidirectional converter grid-connected current,and the system has good dynamic performance and robust performance.