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为了实现LCL型有源电力滤波器(active power filter,APF)在稳定控制的同时,不增加系统的复杂程度,提出了一种基于电网电流检测、逆变侧电流反馈的电流双环控制方法。在不额外增加电流传感器的情况下,通过引入逆变侧电流反馈,实现了对LCL滤波器谐振尖峰的有源阻尼。同时,为了准确地跟踪电网中的谐波电流信号,在2阶广义积分器的基础上,提出了基于降阶广义积分器的电流控制器。利用降阶积分器频率选择和相序解耦的特性,同时实现了较高的谐波补偿精度和运算效率。在一台50k VA LCL型APF上对所提出的控制方法进行了实验验证,实验结果证明了该方法的有效性。
In order to realize the LCL active power filter (APF) stable control without increasing the complexity of the system, a current double loop control method based on grid current detection and inverter side current feedback is proposed. The active damping of the LCL filter resonance spikes is achieved by introducing inverter-side current feedback without additional current sensors. At the same time, based on the second order generalized integrator, a current controller based on reduced order generalized integrator is proposed to accurately track the harmonic current signal in the power system. By using the characteristics of frequency selection and phase decoupling of the degenerated integrator, high harmonic compensation accuracy and computational efficiency are achieved at the same time. The proposed control method is validated on a 50k VA LCL APF. The experimental results show the effectiveness of the proposed method.