有源电力滤波器的改进重复控制及其优化设计

摘要

提出一种有源电力滤波器（APF）的改进重复控制及其优化设计方法。该策略首先在重复控制延时环节中引入零相位低通滤波器,以解决稳定性和稳态精度之间的矛盾,并采用线性超前相位补偿和低通滤波器构建出新的补偿环节,避免控制器设计对被控对象精确数学模型的依赖;然后构建出基于误差和误差变化率非线性函数的免疫反馈控制,以抑制非周期信号的干扰,并确保APF系统具有足够的稳定裕量和动态响应速度;最后以APF有效谐波信号的准确跟踪为优化目标,以合适的系统稳定裕量为约束,利用粒子群算法（PSO）对改进重复控制参数进行优化设计。APF装置的稳态和动态实验结果证明了基于改进重复控制的APF控制策略的正确性和有效性。%An improved repetitive control and its optimization method for active power filter（APF） is proposed.Low-pass filter with zero-phase-shift is employed for delay part of repetitive control to make better tradeoff between robustness and performance,and compensation part based on linear lead compensation function and a low-pass filter is designed so that the control method could be independent on the precise model of the plant.Then immune feedback method with nonlinear function of error and error rate is presented to assure suitable amount of stability margin and dynamic response speed.At last,parameters of the improved repetitive control are optimized with the target of lower error for harmonic tracking,and particle swarm optimization（PSO） is utilized to optimize the control parameters.Experimental results of APF under steady and dynamic conditions verify the correctness and effectiveness of the proposed design method.