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风电接入对继电保护的影响(五)——风电分散式接入配电网对电流保护影响分析(2013年第5期)
类别:联席会学术论文专栏 发布时间:[2014-06-18] 点击数:935

张保会1,郭丹阳1,王  进1,黄仁谋2,吴伟明2,袁  欢2
(1. 西安交通大学 电气工程学院,陕西 西安 710049;2. 海南电网公司,海南 海口 570100)

摘要: 通过对3 种不同类型风力发电机电磁暂态模型的故障仿真分析指出:永磁直驱式风力发电机由于其控制器的限流作用,接入系统短路时不会提供大的短路电流,对过流保护的影响可以忽略;感应式和双馈式风力发电机可能造成风电接入点下游的过流保护误动,造成接入点上游的过流保护范围缩短,导致Ⅱ段拒动。仿真过程中通过改变风电接入位置、故障点位置、线路长度及风电接入容量,分析风电助增电流或分流作用对短路电流及保护各段定值的影响。通过描绘短路电流与风电接入点短路容量比的关系曲线,验证了为防止保护的不正确动作,限制风电接入点短路容量比在10% 以下是必要的。
关键词: 风电场; 故障特征; 继电保护; 短路电流; 仿真

Impact of wind farm integration on relay protection(5):impact of wind farms dispersedly connected todistribution network on current protection
ZHANG Baohui1,GUO Danyang1,WANG Jin1,HUANG Renmou2,WU Weiming2,YUAN Huan2
(1. School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;2. Hainan Power Grid Corporation,Haikou 570100,China)


Abstract: The analysis of fault simulation with electro-magnetic transient model for three kinds of wind power generator shows that,due to the current limitation of its controller,the direct-driven permanent magnetic synchronous generator will not supply big fault current when it is connected to the system with short circuit and its impact on over-current protection can be neglected;the induction generator or doubly-fed induction wind power generator,when it is connected to the system,may cause the misoperation of over-current protection downstream to the grid-connection point and the refuse-to-trip of over-current protection upstream because of the shortened Ⅱ-zone. The impact of wind power in-feed current or shunt current on short circuit current or the settings of different protection zones is analyzed by changing the grid-connection point,fault location,transmission line length and wind turbine capacity. The curve of short circuit current vs. the short circuit capacity ratio of grid-connection point of wind power shows that,in order to prevent the improper operation of protection,the short circuit capacity ratio of grid-connection point should be less than 10%.
Key words: wind farms; fault characteristic; relay protection; short circuit currents; computer simulation

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