【作者】 吴浩；

【导师】 韩祯祥；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2002， 博士

【摘要】 本文进行了电压稳定的机理探讨、数学模型的建立、分析方法、电压稳定和功角稳定关系等方面的研究。此外，还阐述了电压稳定实时监控的一般框架，并在实际系统中实现了该框架的主要功能。 指出了现有的电压稳定定义不能将电压稳定、负荷稳定、功角稳定三者明确的区分开；计及动静负荷特性的功角稳定模型已经可以描述暂态电压稳定性问题；暂态电压稳定的奇异诱导分岔定义为研究暂态电压稳定问题提供了一个思路；分岔分析方法和能量函数方法是统一研究电压稳定和功角稳定的可能方法。 在能量函数法的思想下，功角稳定和电压稳定的关系可以通过不稳定平衡点模式来研究，并由不稳定平衡点模式的不同而区分出两者。系统可能的失稳模式受负荷模型、负荷位置、网络结构、运行方式等因素的影响。常用电力系统P-V曲线的下半部分包含有不稳定平衡点随功率P变化的丰富信息。 微分-代数方程下的奇异诱导分岔可作为暂态电压崩溃的一种机理解释，在典型系统中详细地分析了该机理，并在多机系统中构造出相应的算例，此外还提出了在多机系统中计算奇异诱导分岔点的算法设想。对电力系统的微分-代数方程模型及其奇异扰动方程模型的研究表明，它们有本质上的区别，两个模型在不稳定平衡点的小扰动分析结论上可能存在不一致。而由于结构保持能量函数在实际使用中采用微分-代数方程模型，故可能导致奇异诱导分岔，并使计算结果相对于仿真方法偏于保守。此外，还以图形形象地解释了多能量函数面和奇异诱导分岔等概念。 用仿真方法详细地研究了感应电动机的稳定性、系统电压稳定性、功角稳定性三者的关系。典型系统和多机系统下的研究结果都表明，感应电动机的失稳可能导致系统电压崩溃。 阐述了电压稳定实时监控的一般框架，以及该框架理论在某实际系统中的实际应用情况，并简要评述了一些常用静态电压稳定分析算法的实际性能。更多还原

【Abstract】 This dissertation conducts research works on the mechanisms, modeling and analysis method of voltage stability. The relationship of voltage stability and angle stability is discussed thoroughly. The general framework of real-time voltage stability monitoring and controlling is also presented. The main function of this framework is implemented in a real system.The current definition of voltage stability can’t distinguish voltage stability problem from load stability and angle stability problem clearly. As the reault, the angle stability model that includes static or dynamic load character can be used to study transient voltage stability problem. Transient voltage stability can be defined by means of Singularity Induced Bifurcation (SIB); this offers an approach of transient voltage stability analysis. The possible methods to unite voltage stability and angle stability analysis are energy function method and bifurcation analysis method.Under the light of energy function method, angle instability and voltage instability can be thought as different unstable mode, and be distinguished from each other by characteristic of UEP. The possible unstable mode is influenced by load model, load location, network structure and system operation manner. The lower part of PV curve contains abundant information about UEP bifurcating as power changes.The SIB of Differential-Algebra Equation (DAE) can be interpreted as one mechanism of transient voltage unstable or voltage collapse, and this mechanism is illustrated under multi-machine system. Moreover, the algorithm for search SIB point under multi-machine system is proposed. The study of DAE model and its singularity-perturbed model shows that they are different in essence. Inconsistency may exist under small signal stability analysis of UEPs. Structure preserved energy function method uses DAE model in actual application, this may lead to SIB and make the result pessimism with respect to simulation method. Besides, the concepts, such as SIB and multiple energy function sheets, are explained by picture.The relationship among induction motor stability, system voltage stability, and angle stability is studied detaily by simulation method. The mechanism that induction motor losing stability can lead to voltage stability is confirmed by the analysis results of typical system and multi-machine system.The general framework of voltage stability real-time monitoring and controlling is expounded, and one real system application case of this framework is narrated. The practical performances of common used static voltage stability analysis algorithm are briefly discussed.更多还原