三相四开关并联型有源电力滤波器控制策略研究

提出将改进的七段式SVPWM算法运用于三相四开关并联型有源电力滤波器(TFSSAPF),并设计比例积分和快速重复控制并联的指令电流控制系统.文中SVPWM算法在传统clark变换基础上,基本电压空间矢量通过坐标旋转方法使之与两相静止坐标系的坐标轴相重合,简化了参考电压矢量扇区判断和合成参考矢量的相邻矢量作用时间的计算量.仿真结果证明该SVPWM算法的有效性和正确性,所设计的指令电流控制系统能优化APF补偿效果.

Research on control strategy of three-phase four-switch shunt active power filter

ABSTRACT: Three-phase four-switch inverter is used in active power filter (APF) in this paper, the inverter circuit is consisted of the two groups of switch leg and a set of dual capacitor, this structure simplifies the drive circuit, and reduces the cost of APF. But the traditional SVPWM algorithm is not applied to it, this paper presents the improved seven-segment SVPWM algorithm used in three-phase four-switch shunt active power filter (TFSSAPF), and the design of the insturction current control system with proportional integral and fast repeat control in parallel. In this paper SVPWM algorithm adopts the coordinate rotation method on the basis of the traditonal clark transform, so as to make the basic voltage space vector coincide with the two-phase stationary axes of the coordinate system, simplifies the calculation of judgement of reference voltage vector sector and acting time of synthetic vector. The use of seven-segment SVPWM algorithm effectively reduces the switching frequency, and the instruction current control system further reduces Total Harmonics Distortion of the load current. The simulation results prove the validity and correctness of SVPWM algorithm, and the instruction current control system optimizes the compensation effect of active power filter. KEY WORDS: Active power filter Three-phase four-switch SVPWM proportional-integral repeat control