电力系统暂态稳定性概率评估方法的研究-电力系统及其自动化专业毕业论文.docx

摘要
电力系统稳定性评估在电力系统的运行与规划中占有十分重要的地位。传统的稳定性分析都是在系统的元件参数、运行条件及扰动方式给定的情况下进行的,属于确定型分析方法。然而,电力系统是一个具有随机特性的大系统,确定型分析没有考虑各种事故发生的可能性,因此很难进行系统稳定的可靠性分析。相比之下,暂态稳定性概率分析根据系统中影响暂态稳定的主要随机因素的统计
特性来确定系统暂态稳定性的概率指标,能够更深刻地反映电力系统暂态稳定性
的实质。目前,已有大量学者在暂态稳定概率分析方法这一领域进行了探索,并提出了许多富有成效的算法。但是由于概率稳定分析本身需要考虑的随机因素种类繁多,因而概率稳定评估方法所面临的最大障碍是计算复杂。
最后本文将该方法应用于新英格兰典型电力系统和华北电力系统中进行评估,验证了该评估方法的合理性和高效性。
关键词: 暂态稳定,修正的暂态能量函数,概率分析
AB STRACT
stabili匆evaIuation h髂long been recognized舔a mndamental part of power system pla衄ing,desi印,0peration and 'power systems have been planned锄d 0perated using detenIlinistic transient %
stabili够粕alysis is basically a probabilistic rather than dete册inistic problem.
Detenninistic弱sessment can not renect the essence of power stability pared with detemlinistic臼ansi%t s切bili哆assessment of power
systems,也e result of probabilistic s劬ili够嬲sessment can proVide a realistic
印pfaisal on instabili哆level of tlle eXpected订锄sient ped’o锄ance of systems 1lslng stochastic data of ,a series of probabilistic approaches have be明 %a challen百ng probl锄is me pfobabilistic印proach allows too
l)utation t0 satis母the demand of stabili够硒sessment 0n—line.
As for锄s problem,a new锄al如cal modcl desc曲ed the uncenain够of the fauIt
cle撕ng time for probabilistic tmnsient s协bili够褐sessment of power§ysteIIls is proposed in mis modcl,a Corrected ThIlsient Energ),Function(CTEF) based hybrid雅alysis s仃ategy is developed t0 eValuate probabilistic ins协lili够index of this髓alysis ,位萄ecto叮siInulation inco叩orating wi也CTEF
energy ma玛in of contingencies is conducted t0 judge tlle st2Lbilit)r 0r t0 evaIuate Critical Cle耐ng T)吼d让Ien the probabilistic insta]bil时ind腻of contingency is evaluated wim也e stabili够inf0咖ation 0r wi廿l 0utstanding adv加tage of t11is印proach is t11at T eValuation is only conducted ve珂severe contingendes which are 0nly a mlction for the all contingencies
considered in the prob