电网电压畸变情况下三相PWM整流器无差拍电流控制

Deadbeat current control for three-phase PWM rectifiers during distorted grid voltage conditions

针对传统无差拍电流预测控制算法在电网电压畸变时无法准确跟踪电流参考值的问题,提出了基于电网电压预测的无差拍电流控制方法。首先分析了电网电压谐波对无差拍控制的影响,而后利用重复控制原理对未来两个周期的电网平均电压进行预测和补偿,消除了电网电压整数次谐波对电网电流的影响,降低了电网电流谐波。通过进一步分析,证明了该控制算法保持了传统无差拍控制良好的动态性能,并对算法的稳定性、参数鲁棒性和静态误差进行了分析。最后通过仿真和实验验证了提出方法的正确性和有效性。

A deadbeat current control strategy based on grid voltage prediction was developed to accurately track the current reference when the grid voltage is distorted. The influence of the grid voltage harmonics on the deadbeat corttrol was analyzed to develop a method to eliminate the influence of the grid voltage integer harmonics on the grid current. The method uses repetitive control to predict the average grid voltage in the next two control cycles to give excellent dynamic control. The analysis also analyzes the system stability, parameter robustness and static errors. Simulation and Tests validate the correctness and effectiveness of this method.