基于DSP＋CPLD的有源电力滤波器控制系统的设计

为了解决三相四线制电网中谐波、无功功率和三相不平衡等电能质量问题,本文采用基于DSP＋CPLD全数字控制的并联型有源电力滤波器（APF）来实现补偿。本文介绍了APF的系统结构及工作原理,并进行控制系统的优化设计。电流检测部分,采用先提取零序电流分量,然后利用基于瞬时无功理论的检测法;补偿电流跟踪控制部分采用定时滞环比较法;直流侧电压采用动态滞环控制法等。通过MATLAB仿真结果表明,采用这种方案,可以对三相四线制系统中的谐波、无功、负序、零序等电流分量进行有效补偿,具有良好的动态补偿效果。

Design on Control System of Active Power Filter Based on DSP and CPLD

To solve power quality issue such as harmonic、reactive power、current imbalance in three-phase,a fully-digitalcontrolled shunt active power filter based on DSP and CPLD for three-phase four-wire power system is studied and designed in this paper.The detecting and control system are studied and designed.In the current detecting part,because of the exist of the neutral wire,it separates zero-sequence current at first,then detects the three-phase current based on instantaneous reactive power theory.In the compensation current control part,a dynamic hysteresis-band current PWM control arithmetic is adopted.The simulation results show that in three-phase four-wire power system the harmonic,reactive power,zero-sequence and negative-sequence currents can be compensated efficiently by this system.