The Study On Control System Of Three-phase Four-wire Parallel Active Power Filter Based On Abc Coordinates

The active power filter(APF) is a new power compensation equipment of harmonic and reactive which was brought forward in 1970's,compared with the traditional passive power filter(PPF), APF has the advantages on response, compensation and dynamic compensation.Control strategy of three-phase inverter for current compensation is the core part of APF. In this paper,the mathematical model of Parallel Active Power Filter(PAPF) is established, three-dimensional space vector pulse width modulation(3D-SVPWM) control algorithm is adopted. 3D-SVPWM has the advantages of high utilization rate of DC-side voltage, and being able to achieve the same compensation effect as using hysteresis control strategy with a lower switching frequency,can solve the neutral current compensation for three-phase four-wire system. However,the traditional 3D-SVPWM algorithm is based onαβ0coordinates,requires large amount of calculation and complex coordinate transformation. So it is improved in this paper and a 3D-SVPWM algorithm based on abc coordinate for PAPF with a split-capacitor inverter topology is presented. This method avoids the tedious coordinate transformation. The non-zero vectors composing arbitrary reference voltage vector can be determined by logic judging. And only simple addition and subtraction operations are needed for the duty cycle calculations. The algorithm has been simulated through SIMULINK simulation and the results verify the effectiveness of the program.Based on the theoretical analysis and simulated research,the hardware and software of PAPF based on DSP and FPGA are proposed. Finally,the realization of 3D-SVPWM control algorithm on FPGA has been researched.