含四桥臂H桥变流器的不对称配电网综合补偿方法  

Comprehensive Compensation Method for Asymmetric Distribution Network with Four-Arm H-Bridge Converter

作　　者：游建章[1] 郭谋发[1] You Jianzhang;Guo Moufa(College of Electrical Engineering and Automation Fuzhou University Fuzhou,350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福州350108

出　　处：《电工技术学报》2022年第11期2849-2858,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51677030)。

摘　　要：为解决配电网电力电子设备存在的功能单一、利用率低、造价高及协同难等问题,提出含四桥臂H桥变流器的不对称配电网综合补偿方法。在静止无功发生器的中性点增设级联H桥对地支路的新型综合补偿装置结构,为接地故障和三相对地参数不对称的补偿电流提供流通回路,考虑配电网三相对地参数不对称和三相负荷不平衡的影响,将有功和无功功率补偿、三相不平衡负荷补偿和三相对地参数不对称电流以及接地故障电流补偿等功能集成至同一套补偿装置。在分析各功能的原理及相互作用机理的基础上,提出基于分序解耦控制的多目标协同控制策略,以及三相对地参数不对称电流补偿与接地故障电流补偿的切换方法。正常运行时,综合补偿装置动态补偿配电网有功功率和无功功率、三相不平衡负荷及三相对地参数不对称电流;接地故障时,三相对地参数不对称电流补偿切换至接地故障电流补偿。仿真结果验证了所提方法的有效性。In order to solve the problems of single function,low utilization rate,high cost and difficulty in coordination of power electronic equipment in the distribution network,a new comprehensive compensation method for unbalanced distribution network with four-arm H-bridge converter was proposed.A new topology structure of adding cascade H-bridge to ground branch at the neutral point of static var generator was proposed to provide circulation circuit for ground fault and parameter asymmetry compensation current.Considering the influence of unbalanced parameters of three phase to ground and unbalanced load in distribution network,the functions of active and reactive power compensation,three-phase unbalanced load compensation,unbalanced voltage suppression and ground fault current compensation were comprehensive into the same comprehensive compensation device.Based on the analysis of the principle and interaction mechanism of each function,the multi-objective cooperative control strategy based on sequence decoupling control,and the switching method of threephase parameter unbalance suppression and ground fault current compensation were proposed.In normal operation,the comprehensive compensation device dynamically compensated active and reactive power of distribution network,suppresses three-phase unbalanced load and unbalanced voltage of three-phase parameters.In case of grounding fault,three-phase parameter unbalanced voltage suppression switched to ground fault current compensation.Simulation results verify the effectiveness of the proposed method.

关 键 词：不对称配电网 综合补偿 功率补偿 不对称补偿 接地故障补偿 四桥臂H桥变流器 

分 类 号：TM726[电气工程—电力系统及自动化]