基于LCL滤波器的电压型PWM整流器的研究

针对电压型PWM整流器开关频率附近的高次谐波污染电网,传统的电压型PWM整流器的控制策略都是基于两相旋转坐标系,存在电流交叉耦合项、计算量大的问题,提出了一种两相静止坐标系下基于LCL滤波器的PWM整流器的控制算法。该算法利用Clark变换系将三相静止坐标系下的电压型PWM整流器系统变换到两相静止坐标系下的电压型PWM整流器系统,避免了两相旋转坐标系下的电流交叉耦合项;采用准谐振调节器控制电压型PWM整流器的电流,实现了电流的跟踪控制。Matlab仿真结果验证了该算法的正确性和可行性。

Research of Voltage Source PWM Rectifier Based on LCL Filter

In view of problems that high harmonics of switching frequency of voltage source PWM rectifier pollute power grid and traditional control strategies of voltage source PWM rectifier are all based on two-phase rotating coordinate which has cross coupling member of current and large calculation,the paper proposed a control algorithm of voltage source PWM rectifier based on LCL filter under two-phase static coordinate.The algorithm makes voltage source PWM rectifier system under three-phase static coordinate transform voltage source PWM rectifier system under two-phase static coordinate by use of Clark transform system,which avoids cross coupling member of current under two-phase rotating coordinate;the algorithm uses quasi-resonant regulator to control current of the rectifier,which realizes tracking control for current.The Matlab simulation result proved correctness and feasibility of the algorithm.