无功和谐波补偿装置的控制方法

Control of reactive power and harmonic compensation equipment

针对具有功率因数补偿、补偿负载不平衡和滤除电网谐波电流等功能的联合运行系统,提出一种新的控制方法,由SVC模式控制和APF控制2部分组成。其中,SVC模式控制通过负序基波提取器实现电网负序基波分量的检测;通过改进的电压控制器实现公共连接点的电压稳定。利用特定次数谐波检测并进行相位补偿的方法实现电网谐波分量的检测;利用神经元广义积分PI控制算法实现对特定次数谐波的分频补偿,应用该算法的控制器结构简单,有较强的鲁棒性,同时应用该算法可以自适应调节控制器的参数,从而提高系统的电流跟踪性能。仿真和实验结果证明了该控制方法的可行性和有效性。

A control scheme is proposed for the combined system with the roles of power factor compensation,unbalanced load compensation and harmonic current filtering,which is composed of SVC（Static Var Compensator） mode control and APF（Active Power Filter） control.In SVC mode control,the negative sequence fundamental extractor is used to detect the negative sequence fundamental current of grid and the improved voltage controller is used to realize the voltage stability of PCC.The harmonic components of grid are detected by specified harmonics detection and phase compensation while the frequency dividing compensation for specified harmonics is implemented with the neural cell generalized integrator control.With simple structure and good robustness,the proposed controller adjusts parameters adaptively to improve the tracking performance.Simulative and experimental results show its feasibility and effectiveness.