一种具备单相接地故障调控与无功补偿能力的多功能并网型变流器  

Multifunctional Grid-connected Converter With Capabilities of Single-phase Grounding Fault Regulation and Reactive Power Compensation

作　　者：涂春鸣[1] 黄泽钧 郭祺[1] 姜飞[2] 肖凡[1] 肖泽坤 卢柏桦 侯玉超 TU Chunming;HUANG Zejun;GUO Qi;JIANG Fei;XIAO Fan;XIAO Zekun;LU Baihua;HOU Yuchao(National Electric Power Conversion and Control Engineering Technology Research Center(Hunan University),Changsha 410082,Hunan Province,China;School of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410004,Hunan Province,China;Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530023,Guangxi Zhuang Autonomous Region,China)

机构地区：[1]国家电能变换与控制工程技术究中心(湖南大学),湖南省长沙市410082 [2]长沙理工大学电气与信息工程学院,湖南省长沙市410004 [3]广西电网有限责任公司电力科学研究院,广西壮族自治区南宁市530023

出　　处：《电网技术》2021年第11期4286-4295,共10页Power System Technology

基　　金：湖南省科技领军人才计划(2019RS3014);国家自然科学基金面上项目(52077072)。

摘　　要：针对现有配电网接地故障消弧装置存在的设备利用率低下、容量要求高等突出问题,提出了一种兼具接地故障调控与无功补偿能力的多功能并网型变流器(multi-function gridconnectedinverter,MF-GCI)。首先介绍了MF-GCI的拓扑结构和工作原理,MF-GCI由有源模块和无源模块组成,系统在电网正常运行时工作于无功补偿模式,保证电网侧单位功率因数运行;在电网发生单相接地故障时工作于消弧模式,有效抑制接地故障电流。其次,通过数学推导和矢量图分析可知,有源和无源模块的协调运行实现了MF-GCI在任一模式下的容量优化。此外,提出了MF-GCI的动作逻辑以及模态间柔性切换方法,有效解决了模式切换时出现的变流器输出电压超调问题。最后,通过不同方案的对比分析,以及仿真和实验验证了所提拓扑结构及功能的正确性、可行性和有效性。Aiming at the problems of low equipment utilization and high capacity requirement of the existing grounding fault arc suppression devices in the distribution network, this paper proposes a multi-function grid connected inverter(MF-GCI) with the ability of grounding fault regulation and reactive power compensation. This paper firstly introduces the topology and working principle of the MF-GCI.The MF-GCI is composed of the active module and the passive module. The system works in the reactive power compensation mode when the power grid is in normal operation to ensure the unit power factor operation of the power grid side;When a single-phase ground fault occurs in the power grid, it works in the arc suppression mode to effectively suppress the ground fault current. Secondly, through the first mock exam and vector analysis, the coordinated operation of the active and passive modules can achieve the capacity optimization of the MF-GCI in either mode. In addition, this paper proposes the operation logic of MF-GCI and the flexible switching method between the modes, which effectively solves the problem of converter output voltage overshooting during the mode switching.Finally, the correctness, feasibility and effectiveness of the proposed topology and function are verified through the comparative analysis of different schemes, the simulation and experiments.

关 键 词：单相接地故障 无功补偿 并网变流器 消弧 

分 类 号：TM721[电气工程—电力系统及自动化]