摘要
针对低电压穿越控制策略下的并网光伏电站会影响配电网传统方向元件的动作区域,提出适用于光伏电站并网的配电网系统方向元件动作区域计算方法。以故障时光伏电站输出特征为前提,对线路不同位置与不同故障类型下保护处正序电压与正序电流的相角关系进行分析,提出基于正序故障电流和正序故障电压相角差的方向元件动作区域。基于PSCAD搭建典型含光伏电站配电网模型,对各种故障类型及故障位置进行仿真验证,结果表明所提方法能有效判断故障方向,且不受故障类型与故障位置的影响。
As the grid-connected PV（Photo Voltaic） plant under LVRT（Low-Voltage Ride-Through） control may influence the action area of traditional directional elements in distribution network,a suitable action area calculation method is proposed. The phase-angle relation between the positive-sequence current and the positive-sequence voltage of protection is analyzed according to the output characteristics of PV plant for different line fault types at different locations and the directional element action area based on the phase-angle difference between positive-sequence fault current and voltage is presented. A PSCAD model of typical distribution network with PV plant is established and simulations are carried out for different fault types at different locations,which show that,immune to fault type and fault location,the proposed method determines the fault direction effectively.
出处
《电力自动化设备》
EI
CSCD
北大核心
2017年第7期20-24,共5页
Electric Power Automation Equipment
关键词
配电网
光伏电站
低电压穿越
方向元件
动作区域
序分量
distribution network
photovoltaic plant
low-voltage ride-through
directional element
action area
sequence component
