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单相重合时序对系统暂态稳定的影响

ISSN号：1006-6047
期刊名称：电力自动化设备
时间：0
页码：1-4
语言：中文
分类：TM712[电气工程—电力系统及自动化]
作者机构：[1]昆明理工大学电力工程学院,云南昆明650051, [2]哈尔滨工业大学电气工程系,黑龙江哈尔滨150001, [3]中国南方电网云南电网公司,云南昆明650051
相关基金：国家自然科学基金资助项目（50347026,50467002,90610024）;云南省科技攻关项目（2003GG10）;云南省自然科学基金项目（2005F0005Z,2004E0020M,2002E0025M）.
相关项目：特高压大容量远距离云电送粤的若干稳定问题研究

关键词：电力系统, 暂态稳定, 单相重合闸, 重合时序, power system , transient stability, single- phase re - close , re - close sequence

中文摘要：

以单机无穷大系统为例，分析了系统下列故障暂态过程：单相接地短路；单相断路器动作，切除故障相；故障相投入单相重合闸：三相断路器动作．切除故障线路。以等面积法则为理论依据，从机理上分析了线路两端单相重合闸投入的顺序对系统暂态稳定性的影响．得出了由非故障侧首先投入单相重合闸可增加发电机转子在暂态运动过程中的减速面积、提高系统暂态稳定性的结论。对某电网500kV线路发生单相故障进行了仿真：故障侧先重合．暂态功角稳定裕度在90．71％-100％间变化：非故障侧先重合．暂态功角稳定裕度于0．9、1．0、1．1s重合时均保持在98．43％；在重合时间为1．1s时，故障侧先重合，暂态电压稳定裕度为11．52％，非故障侧先重合，暂态电压稳定裕度为98．73％．电压稳定裕度提高了7．57倍；在重合时间为1．2s时．故障侧先重合，系统的暂态频率稳定裕度为30．20％，非故障侧先重合，系统的暂态频率稳定裕度为49．12％，频率稳定裕度提高了62．65％。

英文摘要：

Taking the single- machine infinite- bus system as an example,the transient processes of fault are analyzed ： single - phase grounding fault ; faulty - phase breaker trip ; faulty phase re - close ; three -phase breaker trip. The effect of single-phase re-close sequence at both line terminals on transient stability margin is theoretically analyzed according to equal area criterion,and the conclusion is obtained：the speed-down area during rotor transient operation process is increased and transient stability enhanced by re-closing the normal terminal first. It is validated by the simulation of a 500 kV line single-phase grounding fault ：for re-close time of 0.9, 1.0 and 1.1 s, the transient angle margin is from 90.71% to 100% when faulty terminal re-closes first and 98.43% when normal terminal re-closes first;for re-close time of 1.1 s,the transient voltage stability margin is 11.52 % when faulty terminal re-closes first and 98.73 % when normal terminal re-closes first,which is enhanced 7.57 times;for re-close time of 1.2 s,the transient voltage stability margin is 30.20 % when faulty terminal re-closes first and 49.12 % when normal terminal re-closes first,which is increased by 62.65 %.

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