有源电力滤波器变趋近律滑模变结构控制

基于对三相三线有源电力滤波器电流控制方程的时域分析,得出了滑模变结构控制的一般控制律,并且进一步提出了有源电力滤波器变趋近律滑模变结构控制方法.该方法在一个控制周期内对滑模面进行了分解控制,可使最大偏差在较短的时间内得到纠正,同时又避免了较大幅值的抖振现象.该方法具有跟踪的快速性好,能较好地抑制尖峰现象,能削弱抖振现象,计算量少、适合于有源电力滤波器的实时控制等优点.给出了三相三线制有源电力滤波器仿真和实验结果,结果证明了该文方法的正确性和可行性.

THE VARIABLE REACHING LAW SLIDING MODE CONTROL STRATEGY FOR THREE-PHASE THREE-WIRE ACTIVE POWER FILTER

Based on the time-domain analysis of three-phase three-wire active power filter current control loop, the common sliding-mode control strategy of current control loop is deduced. A new sliding-mode control strategy with variable reaching law is proposed, and the current tracking error can be reduced quickly and chattering can be suppressed effectively under the proposed control strategy. The control performance is analyzed, the proposed control strategy can provide both robustness response, with regard to external disturbance, and a good dynamic response of the current tracking control, can improve current tracking speed and reduce chattering, and has the characteristics of simple computation and easy application. Simulation and experiment results show its validity and feasibility.