无需检测负载有功电流的一种APF无源性控制方法

Passivity-based control of APF with no load active current detection

基于欧拉-拉格朗日(Euler Lagrange-EL)模型的有源电力滤波器(Active Power Filter-APF)无源性控制中将对负载谐波电流的跟踪转换为对系统电源电流的控制,降低了控制器的跟踪难度。针对已有的APF无源性控制文献在设计系统电源电流期望平衡点时需要提取负载有功电流,指出负载有功电流只是APF直流侧电压闭环的一个前馈信号,提出一种改进的无需检测负载有功电流的基于EL模型的APF无源性控制方法,在降低控制器算法复杂程度的同时去掉负载有功电流提取算法中数字低通滤波器(Low Pass Filter-LPF)带来的延时。仿真和实验证明了方法的有效性。

Since load harmonic current track is converted to the system supply current control in Euler-Lagrange （EL） model-based active power filter （APF） passive-based control, it reduces the difficulty of tracking of the controller. In order to overcome the problem of load active current detection while designing the expected equilibrium point of system supply current in the existing literature, this paper concludes that the load active current detection is just a feed forward signal of DC voltage closed-loop controller and proposes an improved passivity-based control of APF based on the EL model which does not need load active current detection. This has drastically reduced the complexity of the controller and removed the delays of control which is caused by the low-pass filter when extracting load active current. Simulation and experimental results show the correctness of the method.