有源电力滤波器指定次谐波补偿技术研究

设计出一种基于比例谐振(proportional resonant,PR)控制和指定次谐波检测的有源电力滤波器(active power filter,APF)控制系统,并论述了PR控制器和指定次谐波检测法的结构和原理.基于PR控制器的有源电力滤波器可直接在静止坐标系αβ下完成谐波电流的检测和跟踪控制,克服了传统PI无法对交流给定信号实现无静差跟踪的缺点.给出了APF用于改善电网中指定次谐波的仿真实验波形,仿真结果表明,基于PR控制的APF能快速准确补偿电网中的指定次谐波,验证了所采用的指定次谐波检测法原理和PR控制器设计的正确性和有效性.

Research on Selected Harmonic Compensation Technology of Active Power Filter

A control system of active power filter based on proportional resonant control and selected harmonics detection is designed, with the structure and principle of the PR controller and the selected harmonics meathod presented in this paper in detail. Harmonic currents detection and tracking control of active power filter based on proportional resonant control can be completed directly instationary coordinate system, which overcome the faults of the traditional PI unable to astatic tracking the given alternating signal. The experimental results are presented in order to verify the function of the active power filter to improve the selected harmonics in power grid. The experimental results show that active power filter based on proportional resonant control can compensate the selected harmonics in power grid fast and accurately. The validity and accuracy of the proposed specified harmoniesdetection principle and PR controller design are verified.