基于改进单周矢量控制的SAPF控制方法研究

RESEARCH ON SAPF CONTROL METHOD BASED ON IMPROVED ONE-CYCLE VECTOR CONTROL

传统的并联型有源滤波器(SAPF)控制均包含检测环节,而单周控制则可省去该环节。但传统的单周控制仅适用于三相对称系统,因此该文引入"零和分量"概念,使其还能实现非平衡状态下的控制。另外在仅采用单周控制时的各开关都工作在高频状态(损耗大),为此引入矢量运算。此外,SAPF直流侧电压常采用PI控制,但效果并不理想,该文采用粒子群算法来优化PI的控制参数,以改善控制性能。仿真和实验结果表明在理想/非理想电源下该文所提方法均能在单个开关周期内消除误差,并维持直流侧电压的稳定。

The one-cycle controller omits the detection link while the traditional control method of SAPF includes it.However, the traditional one-cycle control is only suitable for the ideal three-phase symmetrical system. In this paper so the concept of zero-sum component is introduced so that it can realize the control of unbalanced states. In addition,when one-cycle controller is only used,each switch works at high frequency state with high loss. In order to overcome these shortcomings,vector operation is introduced in this paper. Also,the DC side voltage of SAPF usually adopts PI control,but the control effect of traditional PI is not ideal,so this paper uses the particle swarm optimization(PSO)algorithm to optimize the control parameters of PI to improve the control performance of the system. The simulation and experimental results show that the method can eliminate the error in a switching period,and maintain the stability of DC side voltage.