考虑风险的电力系统暂态稳定预防与紧急协调控制研究
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摘要
电力系统暂态稳定安全控制策略在考虑安全性时兼顾经济性,可降低稳定控制引起的经济损失.本文提出了一种适用于大系统,保证切除故障后系统稳定且风险最小的预防控制和紧急控制相结合的协调控制方法.该方法首先建立稳定控制总风险指标,并利用结合时域仿真和多项式拟合方法求出该指标最小情况下所对应的预防控制量和紧急控制量,实现协调控制.仿真实例表明,本文所提出的预防与紧急协调控制策略和紧急控制策略相比,在维持系统稳定的同时降低了经济损失.
To ensure transient stability, security as well as economy should be taken into considerations to reduce the loss which a control strategy brings in. A method coordinates both preventive control and emergency control is presented to maintain bulk power system stability after the fault is removed, and the method helps to keep the risk lowest as well. Based on the concept of risk, an index to measure total risk has been established. Then a procedure combines time domain simulation and polynomial fitting to calculate the quantity of preventive control and emergency control when the index obtains its optimum value has been provided. By presenting the simulation results for a power plant that has been calculated by this method, the system stays stable and the economy loss has been reduced.
To ensure transient stability, security as well as economy should be taken into considerations to reduce the loss which a control strategy brings in. A method coordinates both preventive control and emergency control is presented to maintain bulk power system stability after the fault is removed, and the method helps to keep the risk lowest as well. Based on the concept of risk, an index to measure total risk has been established. Then a procedure combines time domain simulation and polynomial fitting to calculate the quantity of preventive control and emergency control when the index obtains its optimum value has been provided. By presenting the simulation results for a power plant that has been calculated by this method, the system stays stable and the economy loss has been reduced.
引文
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[2] 姚建刚,刘奇,陈辉华,等.湖南电网安全稳定水平分析[J].湖南电力,2003,23(4):1-4.
[3] 陈辉华,宋军英,唐外文.不同负荷模型对湖南电网暂态稳定水平的影响[J].电网技术,2007,31(5):29-33.
[4] 宋军英,李欣然.考虑分布式小水电的负荷模型对湖南电网暂态稳定影响[J].湖南电力,2013,33(S2):1-3.
[5] 王伟,毛安家,张粒子,等.市场条件下电力系统暂态安全风险评估[J].中国电机工程学报,2009,29(1):68-73.
[6] 宋晓喆,汪震,甘德强,等.台风天气条件下的电网暂态稳定风险评估[J].电力系统保护与控制,2012,40(24):1-8.
[7] McCalley J D,Vittal V,Abi-Samra N.An Overview of Risk Based Security Assessment[J].IEEE Power Engineering Society Summer Meeting.July18-22 1999(1):173-178.
[8] 吴为,汤涌,孙华东.基于系统加速能量的切机控制措施量化研究[J].中国电机工程学报,2014,34(34):1-7.
[9] 顾卓远,汤涌,张健,等.基于相对动能的电力系统暂态稳定实时紧急控制方案[J].中国电机工程学报,2014,34(7):1095-1102.
[10] 吴艳桃,吴政球,匡文凯,等.基于单机等面积的暂态稳定切机切负荷策略及算法[J].电网技术,2007,31(16):88-92.
[11] 何井龙.特高压入湘后受端电网安全稳定性研究[D].长沙:湖南大学,2009.
[12] 别芳玫,应黎明,王晋伟,等.水电站辅助服务外部性分析[J].人民长江,2014,45(19):101-104.
[13] 周玉兰,王玉玲,赵曼勇.2004年继电保护与安全自动装置运行情况[J].电网技术,2005,29(16):42-48.