三电平有源电力滤波器模型预测电流控制方法研究

Research of current control method of model predictive for three-level active power filter

针对现有有源电力滤波器大多使用数字化控制器实现,存在系统延时的问题,提出了一种模型预测电流控制方法,并将其应用于三电平有源电力滤波器控制系统中。该方法根据实际有源电力滤波器控制系统模型设计质量函数,在每个采样周期内,对变频器27个电压矢量分别进行评估,选取使质量函数取值最小的电压矢量来控制下一周期开关导通,使有源电力滤波器的补偿电流快速跟踪参考值。仿真结果表明,该方法不仅能使有源电力滤波器实现高性能补偿,而且极大地减小了数字系统的固有延时。

In view of problem of inherent delay of digital system caused by digital controller used in active power filter,the paper proposed a current control method of model predictive and applied it to control system of three-level active power filter.The method designs quality function based on the actual active power filter model,evaluates twenty-seven voltage vectors of frequency converter at each sampling interval,and selects a voltage vector which makes the quality function smallest to control switch conduction in the next sampling period,so as to make the compensation current of active power filter track the reference value rapidly.The simulation results show that the method of model predictive not only can make active power filter realize high performance compensation,but also reduce inherent delay of digital system.