摘要
大容量风电并网面临的主要问题之一是风力发电机的低电压穿越问题。为从馈线保护的角度提高风电场的低电压穿越能力,分析了风力发电机并网点感受到的电压跌落特性,探讨了不同过渡电阻和接地程度系数下故障点电压相量的变化特性,量化分析了风力发电机并网点电压跌落畸变极值及产生条件,指出相间短路故障时存在超越状态,对保护的动作特性影响较大,接地故障时电压跌落的畸变极值受接地程度系数的影响严重。
The low voltage ride through（LVRT） capability is one of the most important problems in the large-scale wind generators connecting to the distribution grid.Since the most voltage sags in the system are caused by faults in feeders,the voltage sags propagation characteristics is key to the design of control strategy of LVRT for wind turbines.In order to enhance the LVRT capacity of wind farm by shortening fault duration from the point of the feeder protection,the profiles of line voltage variations at the fault point are presented with different un-balance fault situations.The extreme voltage aberration and the occurrence conditions in different earthing resistance and residual situations are quantified.The uncommon extreme sags with phase-phase faults is discovered,which may cause the mis-operation of relay.It is also found that the main factors causing extreme sags with phase-ground fault is the value of residual degree factor.
出处
《电力系统自动化》
EI
CSCD
北大核心
2011年第10期53-58,共6页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(51007045)
北京市自然科学基金资助项目(3102017)
高等学校博士学科点专项科研基金资助项目(200800031034)
电力系统及发电设备安全控制和仿真国家重点实验室基金资助项目(SKLD09M32,SKLD10M08)
中国电机工程学会青年基金资助项目~~
关键词
风力发电机
低电压穿越
电压跌落
配电系统
风力发电
wind turbine driven generator
lowe voltage ride through
voltage sag
distribution system
wind power
