基于离散状态空间的单相动态电压恢复器控制  

A Discrete State Space Controller for Single-phase Dynamic Voltage Restorers

作　　者：雷何[1] 林新春[1] 薛明雨[1] 康勇[1] 

机构地区：[1]强电磁工程与新技术国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》2013年第18期140-146,4,共7页Proceedings of the CSEE

摘　　要：由于滤波电容并联在负载侧的单相动态电压恢复器(dynamic voltage restorer,DVR)有更好的滤波效果,因此针对该拓扑提出一种基于离散状态空间的负载电压控制策略。该控制策略包含两个方面,一方面采用离散状态反馈跟踪指令,另一方面采用前馈解耦抑制扰动。将实际控制系统中存在的滞后一拍当做新的状态变量参与反馈,增强了系统可控性。由于控制自由度足够,因此可根据阻尼比和带宽直接配置零极点,以获得更好的指令跟踪能力。由于负载电压是控制目标,电源电压和负载电流扰动会影响控制性能,因而采用前馈解耦的控制方法抑制扰动的影响。在1.5 kW的单相DVR实验装置上的实验结果验证了该控制策略的有效性。Considering that the load-side capacitor Dynamic Voltage Restorer（DVR） has good filtering capability,a load voltage control topology by use of the discrete state space was proposed.The discrete state feedback is adopted to improving the reference tracking ability,and feed-forward decoupling is adopted to suppressing disturbances.Due to the multi-feedback of state variables,including the one beat delay feedback,the controller of DVR offers almost full controllability.Therefore,due to enough freedom degrees,the poles and zero of the control system can be placed directly according to the desired closed-loop natural frequency and damping ratio.To reject the disturbances of the source voltage and load current,the feed-forward decoupling is usually employed.Experimental results of a 1.5 kW single-phase DVR prototype system are included to support the theoretical analysis.

关 键 词：动态电压恢复器 离散状态空间 状态反馈 前馈解耦 

分 类 号：TM46[电气工程—电器]