多重化大功率有源电力滤波器的控制系统研究

Control system of the multiple large power rate active power filter

分析讨论了多模块化PWM变流器实现的多重化大功率有源电力滤波器的结构、原理以及对控制系统的要求,根据其特点设计了基于双DSP的数模混合控制系统,给出了控制系统硬件结构以及软件实现,采用软件锁相和硬件锁相相结合的方式有效地解决了同步问题,并针对有源滤波器应用中的一些具体问题给出了软件解决方案。最后给出了采用该控制方案的二重化有源电力滤波器的实验结果。实验结果表明,基于该控制系统的有源电力滤波器具有很好的补偿效果。

First, the configuration and operation principle of the large power rate active power filter with multiple PWM converters are introduced and analyzed. Second, according to the control purpose, the digital- analog hybrid control system based on dual DSP is presented, and the configuration of control system and the flow chart of software are introduced. The synchronization of current reference and net voltage is well achieved by adopting the combination of hardware phase lock loop and software phase lock loop. Software is programmed specially in order to solve the problems of applying active power filter,such as adopting different filters according to various compensation purposes and adopting different PI conditioner according to the process of active power filter. Finally, the experimental results of the active power filter adopting the proposed control system are given. It shows that the compensation properties of the active power filter are very good.