有源电力滤波器闭环控制算法研究

Studies of Closed-Loop Control Strategy of Active Power Filters

有源滤波器是电力系统谐波补偿的新型解决方案。现有的有源滤波器多采用开环控制算法,谐波补偿性能受参数不确定和干扰的影响较大。在讨论了延时稳定性等并联型有源电力滤波器闭环控制算法设计的关键技术基础上,扩展了RDFT(Real Discrete Fourier Transform)组合选频滤波器并证明了其数学性质,提出了基于此算法与重复控制原理的闭环无差控制算法。PSCAD/EMTDC仿真实验表明,该算法可以实现对多个指定频率的谐波进行稳态无差的补偿。

Active power filtering （APF） technology is a novel solution on power system harmonic compensation. Open-loop control strategies are widely used in APFs these years, while the performance would be influenced heavily by disturbances as well as parameter uncertainty. In this paper, key problems in shunt APF close-loop controller design such as delay-oriented stability problem are discussed, and characteristics of RDFT selective filters are investigated. A novel control algorithm based on RDFT selective filter and repetitive control is developed. Simulations on PSCAD/EMTDC confirm the theoretical expectations.