具有LVRT能力的并网光伏系统继电保护问题研究  

Research on relay protection issues of grid-connected photovoltaic system with LVRT ability

作　　者：张海玉[1,2] 刘闯[3] 晁勤[1] 希望.阿布都瓦依提 李育强[1] 刘清贵[1] 

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830047 [2]国网新疆电力公司电力科学研究院,新疆乌鲁木齐830013 [3]国网新疆电力公司昌吉供电公司,新疆昌吉831100

出　　处：《电力系统保护与控制》2015年第3期53-60,共8页Power System Protection and Control

基　　金：国家自然科学基金资助(51367016;51367017)~~

摘　　要：具有低压穿越能力(Low voltage ride-though,LVRT)的光伏电站接入电网给保护带来一系列挑战。首先基于光伏电站的结构对光伏系统LVRT能力要求及反孤岛保护检测时间限制两个标准进行了介绍与分析,并基于PSCAD/EMTDC仿真分析了具有LVRT的光电站故障特性。其次从光伏电站接入配电网和输电网两个角度,在总结了具有LVRT能力的光伏电站故障特性基础上,归纳提出了配电网电流三段保护、重合闸、熔断器等受光伏电站的影响问题。深入分析了光伏电站LVRT能力与逆变器直流侧保护、反孤岛保护,输电网主变保护与线路纵差和距离保护等协调配合问题。最后,提出相应的整定原则或改进措施。The connection of the photovoltaic power plants which have capability of low voltage ride-through（LVRT） brings the grid protection a series of challenge. Firstly, the requirements of PV’s LVRT capability and the time limit of anti-islanding protection detection which the current standards asked are researched in detail based on the structure of photovoltaic power plants. Secondly, the failure characteristics of photovoltaic power plant with the ability of LVRT are studied based on PSCAD/EMTDC. Thirdly, based on the failure characteristics of the photovoltaic power plant, the impact of PV power plant’s LVRT ability on the current three sections protection, reclosing, fuses is studied in-depth when it joins in the distribution network and transmission network; the cooperation problems of PV power plant’s LVRT ability with the DC-side protection of PV’s inverter, anti-islanding protection, main transformer protection, line longitudinal differential and distance protection are analyzed deeply. Finally, the corresponding setting principle and improvement measures are put forward.

关 键 词：光伏 LVRT 故障特性 配电网 输电网 继电保护 

分 类 号：TM77[电气工程—电力系统及自动化]