【作者】 阳育德；

【导师】 韦化；

【作者基本信息】 广西大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 电力系统的暂态稳定破坏事故，往往引起大面积停电、跳机，甚至系统崩溃，给社会经济、人民生活、国家管理等各方面造成重大损失。为保证系统运行的安全性、经济性，保证电能质量，进行暂态稳定分析，寻找事故控制的方法，是非常重要而且必要的。传统的电力系统暂态稳定分析，局限于故障+具体运行方式模式，面对不断变化的系统运行状态，无法做出准确有效的判断和决策。传统的最优潮流模型，也无法做到经济性和安全性的有效兼顾。 本文基于传统最优潮流模型，考虑了多个预想故障的情况。利用隐式梯形积分规则，将各个故障下电力系统所有发电机转子运动方程差分化作为等式约束，把发电机转子相对摇摆角极限作为不等式约束，二者作为暂态稳定条件加入最优潮流当中，建立了多预想故障暂态稳定约束最优潮流模型，并利用现代内点理论对模型进行求解。在此基础上，提出了以大积分步长计算结果进行故障预选和同调识别的新方法。利用Matlab6.5进行的仿真结果表明：以该模型和现代内点理论结合所得的新算法收敛性好，故障预选和同调识别准确，计算量大幅降低。能迅速得到满足多个电力系统预想故障的暂态稳定条件，且目标值为最优的系统初始稳定运行状态，做到了系统经济性和安全性的良好兼顾。更多还原

【Abstract】 The breakdown of transient stability is one of the most serious accidents in power system. Lines and generators will trip, power supply in a large range area will stop, and even the system will collapse sometimes when this kind of accident happens. Therefore, it is significant and necessary to analyze the transient stability theory of power system and find out some effective methods to control or prevent accident from happening. But the traditional stability analyzing follows a pattern of contingencies plus exact operating status. In this pattern, we can’t estimate the transient stability of system efficiently or in full-scale because of the infinity of operating status. Traditional optimal power flow (OPF) module can not integrate economy and security of system in a good manner, either.Through the combining of optimal power flow module and transient stability conditions, we set up a new multi-contingencies transient stability optimal power flow module (TSOPF).Based on the general OPF module and under multi-contingences conditions, all swing equations of generators will be converted into numericalequivalent algebraic equations set by using the implicit trapezoidal rule, and are involved in equality constrains set; all rotors’ angles related to COI are used to be inequality constrains. After this new TSOPF module including of transient stability secure constrains constructed, the paper presents a new algorithm combined interior point algorithm for solving it. And then, the number of pre-contingences in contingences sets will be re-defined by using this algorithm in long time interval. Programming tests and experiments on Matlab6.5 software indicates that new algorithm has very good performance in convergence and calculation speed. The result is accurate, reliable and economic.更多还原