混合电力滤波器无差拍控制策略研究

Deadbeat control strategy of hybrid power filter

通过分析当前电能质量控制措施的优缺点,将无源电力滤波器和有源电力滤波器结合构成混合式电力滤波器,以实现大容量高电压电能质量控制。结合串联型混合电力滤波器,介绍了预测无差拍控制策略。该控制策略根据混合滤波器的逆变电路系统的状态方程和输出反馈信号推算出下一个采样周期的脉冲宽度,并且采用状态观察器预估系统的状态,提前算出控制量以补偿CPU的采样和计算时延,避免对指令电流的跟踪过冲,提高了系统动态性能。最后,给出了Matlab仿真模型和仿真结果。

Current control measures of power quality are analyzed and the hybrid power filter composed of APF（Active Power Filter） and PPF（Passive Power Filter） is presented for the power quality control of high voltage and large capacity. With a serial hybrid power filter,the predicted deadbeat control is put forward,which predicts the pulse width of next sampling period based on the state equations and the output feedback,and compensates the tlme-delay caused by CPU sampling and calculation according to the system state estimated by state observer. It has good system dynamic performance,avoiding the tracking overshot of instructive current. Matlab simulation model and simulative results are given.