Research About Active Power Filter Based On DSP

The harmonic pollution of power system is becoming more and more serious with the using of power electronic equipment in power system.the harmonic should be eliminated because it can do much harm to the power system.Active Power Filter(APF) which is a new harmonic and dynamic reactive compensation devices introduced in recent years,compared with the traditional passive LC filter,it has the advantanges of fast reponse,good compensation and dynamic compensation.Digital controlled APF becomes a new research focus in the power electronics with the fast develoment of digital signal processing technology recent years.Firstly,with the research of shunt voltage APF, some basic problem about APF are discussed in this paper,including the basic principle,mian circuit structure and mathematical model of active power filter.Moreover,the p-q method based on the instantaneous reactive power theory and the improved haimonic current detection ip-iq method based on the instantaneous reactive power thory are analyzed.some common compensation current control methods are introduced emphatically studies the triangular wave control and hysteresis current control technique of parallel APF and summarized their advantages and disadvantages.Makes a research about the stability control technology of main circuit dc-link voltage.Then,it chooses TI's TMS320F2812 chip as the core control chip,and designs the hardware platform of active power filter system.Focused on the design of the main circuit of APF,including calculation of the capacity,dc-link voltage,capacitance and selection of switching devices;The signal acquisition circuit modul of system and DSP hardware system are designed in this paper,the PWM pulse program of the system is also given in the paper.The software design of system of active power filter is realized in the CCS softerware environment,including the flow design of the main program,interrupt subroutine process and harmonic current calculation process;The design of low-pass filter and the realisation of PWM pulse generator based on FPGA are given in the paper. Finally,the paper simulates the three-phase shunt voltage APF system in MATLAB/SIMULINK in order to not only confirm the performance and correction of different detection but also control of methods,the simulation results show that APF could achieve good compensation performance based on the appropriate parameters.