摘要
基于阻抗原理的输电线路单相接地故障单端测距精度受过渡电阻及线路对侧系统运行方式的影响。风电场总体表现出弱馈系统特征,但不同类型风电场的故障等值特性不同,使得风电场并网线路传统故障测距算法存在较大误差,且误差机理不明确。针对该问题,建模仿真了异步鼠笼、直驱永磁及感应双馈三种类型风电场运行特性,分别从并网线路系统侧及风场侧对比分析了负序、零序电流与故障点电压的相位差值。量化分析了不同风机类型及并网容量的风场等值序阻抗变化规律,给出了影响风电场并网线路测距精度的因素及作用机理。提出了不同类型风电场并网线路适用的故障测距策略及后续改进方向,大量算例仿真证明了所提故障测距策略的有效性。
The accuracy of single-end impedance based fault location for single-line-to-ground fault in transmission line is mainly affected by the unknown opposite-end system operation mode and fault resistance. In general, wind farm expresses a typical weak infeed system operation characteristic, but the equivalent characteristic of different type＇s wind farm after fault is different, so there is a big fault location error, and the error generation mechanism is not clear. In response to this problem, this paper models and analyzes operation characteristics of three types＇ wind farms： Squirrel Cage Induction Generator（SCIG）, Permanent Magnetic Synchronous Generator（PMSG） and Doubly-Fed Induction Generator（DFIG）, and then contrasts the phase difference values between voltage at fault point and negative and zero sequence currents at the two ends of line. After that, it quantifies the equivalent impedance variation patterns of different types＇ wind turbines and different grid-connection capacities of wind farm, in following, analyzes the fault location precision and correlative factors both from the power system side and wind farm side. The suitable fault location schemes response to different types＇ wind farms are clearly concluded in this paper based on believable cases simulations, and the further improvement direction is also pointed out.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2016年第19期63-69,共7页
Power System Protection and Control
基金
国家自然科学基金(51477084)
北京市自然科学基金(3152016)
国网冀北电力公司科技项目资助(20152000959)~~
关键词
风电场
输电线路
单相接地故障
等值序阻抗
故障测距
wind farm
transmission lines
single-to-ground fault
equivalent sequence impedance
fault location
作者简介
袁冰（1977-），男，硕士，主要研究方向为电力系统继电保护技术、运维检修技术等；E-mail：indiligent@sohu．com
王宾（1978-），男，通信作者，博士，副教授，主要研究方向为电力系统继电保护、智能变电站站域集成保护与控制技术、故障测距、高阻故障检测技术等；E-mail：binw_ee@mail．tsinghua．edu．cn
陆元园（1992-），女，硕士研究生，主要研究方向为风电场并网保护与测距技术等。E-mail：lyythu@qq．com
