动态电压恢复器的最优控制和最优滤波  

An Optimal Control Strategy for Dynamic Voltage Restorer With an Optimal Filter

作　　者：郭文勇[1] 肖立业[1] 郭金东[1] 赵彩宏[1] 张志丰[1] 欧阳羿[1] 

机构地区：[1]中国科学院应用超导重点实验室(中国科学院电工研究所),北京市海淀区100080

出　　处：《中国电机工程学报》2009年第6期48-54,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50877076)~~

摘　　要：提出基于最优控制和最优滤波的动态电压恢复器控制策略。该控制方法用Sage-Husa卡尔曼滤波器对动态电压的暂降进行检测,同时实现对三相电网电压的锁相功能。该算法实现了在谐波和不平衡条件下正序电压幅值和相位几乎无延时的检测。为加快系统动态响应速度,提出最优控制的策略;同时设计一个最优滤波器——降维卡尔曼滤波器进行电流状态量的观测。降维卡尔曼滤波器的使用不但节省了3个电流传感器,而且加快了控制的响应速度,从而显著提高了不平衡暂降的补偿能力。实验结果证明该文所提出的控制策略的有效性。A control strategy based on optimal control and optimal filter for dynamic voltage restorer （DVR） was proposed. A Sage-Husa Kalman filter was used to detect voltage sag and was used as a three-phase digital phase lock loop simultaneously. The proposed Sage-Husa Kalman filter based algorithm can detect the magnitude and phase angle of the fundamental- frequency positive-sequence component of the source voltage instantaneously under unbalanced and distorted conditions. In order to improve transient response, an optimal control strategy was proposed, and an optimal filter： reduced dimension Kalman filter was further proposed to observe the deviation term of filter currents used in the controller. The usage of the reduced dimension Kalman filter has not only saved three current sensors, but also enhance the control dynamics with its inherent one step prediction ability, thus the unbalanced sag mitigation ability is greatly enhanced. Experimental results verify the effectiveness of the proposed control strategy.

关 键 词：动态电压恢复器 最优控制 最优滤波 

分 类 号：TM917[电气工程—电力电子与电力传动] TP271[自动化与计算机技术—检测技术与自动化装置]