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一类潮流计算无解的实用性调整研究
引用本文:李敏,陈金富,陈海焱,段献忠.一类潮流计算无解的实用性调整研究[J].电力系统自动化,2006,30(8):11-15.
作者姓名:李敏  陈金富  陈海焱  段献忠
作者单位:华中科技大学电气与电子工程学院,湖北省,武汉市,430074
基金项目:国家重点基础研究发展计划(973计划)资助项目(2004CB217906);高等学校优秀青年教师教学科研奖励计划资助项目;中国博士后科学基金资助项目(2003034473).
摘    要:现代电力系统具有远距离、重负荷、大区联网的特点。随着竞争机制的逐步引入,电网接近极限运行状态,该状态下的潮流方程易出现无解的情况。文中通过分析电力系统潮流无解问题,指出潮流无解的原因可以归结为电网的某一条或几条薄弱输电通道超过其输送极限。基于此,提出一种潮流计算无解时的实用性调整方法:利用降出力法求得最薄弱的输电通道,然后通过提高负荷功率因数来确保系统的无功平衡,并且结合灵敏度来调整发电机出力、切除部分负荷,使潮流计算得到收敛解。对华中电网的测试验证了该方案的可行性和准确性。

关 键 词:潮流无解  灵敏度  降出力法  电力系统
收稿时间:1/1/1900 12:00:00 AM
修稿时间:1/1/1900 12:00:00 AM

Load Flow Regulation for Unsolvable Cases in a Power System
LI Min,CHEN Jin-fu,CHEN Hai-yan,DUAN Xian-zhong.Load Flow Regulation for Unsolvable Cases in a Power System[J].Automation of Electric Power Systems,2006,30(8):11-15.
Authors:LI Min  CHEN Jin-fu  CHEN Hai-yan  DUAN Xian-zhong
Affiliation:Huazhong University of Science and Technology, Wuhan 430074, China
Abstract:The modern power system has its unique characteristics of long distance, heavily loaded and regional connected transmission framework. Owing to the above and the gradual deregulation of the power system, it is becoming increasingly necessary for the system to operate much closer to its loading limits. In this state, power flow equations are apt to have no real solution. By analyzing unsolvable cases in power systems, the reason for unsolvability is pointed out in this paper, that is, the transmission limit of a certain path or several weak paths has been violated. Based on this, an algorithm is proposed to regulate the parameters so as to return to the solvable region. First, find the weakest transmission path by reducing generators and loads. Then, enhance the power factors of loads to ensure the balance of the reactive power. Finally, based on the sensitivities, reschedule the active power of generators while shedding loads to get the convergent resolution of the power flow. The feasibility and veracity of the algorithm is demonstrated in the power grid of Central China.
Keywords:unsolvable power flow  sensitivity  power reducing algorithm  power system
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