基于极点配置和重复控制的电流型单相动态电压调节器  

Research on Current Control Mode Single-Phase Dynamic Voltage Regulator Based on Pole-Assignment and Repetitive Control

作　　者：黄朝霞[1] 邹旭东[1] 童力[1] 康勇[1] 黄清军[1] 

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

出　　处：《电工技术学报》2012年第6期252-260,共9页Transactions of China Electrotechnical Society

摘　　要：首先提出了一种动态电压调节器(DVR)的直接负载电流控制策略。通过直接控制流经串联变压器的负载电流,间接实现了负载电压的动态补偿。根据变压器的τ型等效电路,得到DVR的系统控制模型,为改善负载端电压的稳态与动态补偿性能,对LCL型滤波器结构采用状态反馈极点配置和重复控制相结合的复合控制器;于此同时,考虑到变压器励磁支路对本文控制策略的影响,结合励磁电流补偿的方法,进一步提高负载端电压的补偿精度。仿真和实验结果表明,本文所提控制方案在电网电压波动和负载投切时,能够对负载端电压进行快速、有效的补偿。This paper first proposes a control strategy for dynamic voltage regulator （DVR）direct load current control strategy. Through directly and properly controlling the load current of the series transformer, the goal of dynamic compensation for load voltage could be realized indirectly. With the x-type transformer equivalent circuit, precise DVR system control model is derived. In order to improve the steady and dynamic compensation performance, a compound controller incorporating the state feedback pole assignment and repetitive control is adopted towards the LCL type filter; meanwhile, taking the effects of excitation current into account, transformer excitation current is added to the current control instruction for further enhancing the load voltage compensation accuracy. Simulation and experiment results proved that the control strategy in this paper could realize favorable load voltage compensation performance when network voltage fluctuates or sudden load changes.

关 键 词：动态电压调节器 直接负载电流控制 复合控制器 励磁电流补偿 

分 类 号：TM712[电气工程—电力系统及自动化]