新型混合式有源电力滤波器的控制方法

由于电力系统中使用了越来越多的电子设备，改善功率因数和消除电网侧的谐波电流便成为很重要的问题，为此，介绍了一种混合式电力补偿器（HPC）的自抗扰（ADRC）控制方法，该方法可以有效地改善功率因数和消除谐波——将消除谐波问题转化成系统跟踪给定相位正弦信号问题，利用扩展状态观测器（ESO）估计干扰，并进行补偿，利用非线性状态误差反馈器（NLSEF）实现参考信号的跟踪。这种控制策略的一个显著特点是不需要精确地测量谐波。基于这种控制方法的混合式电力补偿器对于不同的典型负载、负荷侧电流大小和相位的变化都有很强的适应性。最后，通过对不同负载情况进行仿真，结果证明了这种控制方法的有效性。

Control scheme for new hybrid active power filters

In applications of power electronic devices,one of the major concerns is related to correcting power factors and eliminating the harmonic currents on network-side.In this paper an auto-disturbance rejection control(ADRC) scheme for hybrid power compensators(HPC) is presented,which can correct power factor and eliminate harmonics effectively.The original is firstly changed into a tracing problem,where the reference input is a sinusoidal signal with given phase.Then disturbances can be estimated by extended state observer(ESO) and compensated.And a nonlinear state-error-feedback(NLSEF) is employed to realize the tracing of reference input.A distinguished feature of the control strategy is that it does not need to detect harmonics accurately.Hybrid power compensators built on the basis of this control scheme have strong adaptability for different typical loads and the variations in magnitude and phase of loadside currents.Simulation test results prove the effectiveness of the control scheme.