统一潮流控制器的最佳配对及阻尼系统振荡的研究

【作者】 刘国争；

【导师】 赵建国；

【作者基本信息】 山东大学 ， 电力电子与电力传动， 2006， 硕士

【摘要】 统一潮流控制器(UPFC)是灵活交流输电(Flexible AC Transmission System，简称FACTS)技术的一种，其基本思想是用一种统一的可控硅装置，通过控制量的变化，就能分别或同时实现并联补偿，串联补偿和移相等几种不同功能。UPFC正因为其功能强大，从它的概念刚提出开始，就引起了各国学者的重视。 本文以研究UPFC的动态特性为主要目标，在其数学模型的建立、各内部控制器间的相互作用及阻尼系统振荡能力等三个方面开展了研究工作。 首先论文综述了FACTS和UPFC的研究现状及在工程中的应用情况，介绍了本课题的研究背景，即利用大功率电力电子器件快速调节系统潮流，阻尼系统功率振荡，从而达到提高线路输送能力，增强系统稳定性的需求。建立了UPFC的动态模型和潮流模型，这种模型可以减少单个UPFC内部控制器的相互影响。研究了UPFC内部控制器的控制策略，同时为了减小不同控制器间的相互作用，推导了UPFC直流电容连接器上通过的有功功率P_B的表达式。推导了包含单个UPFC的单机无穷大系统数学模型，同时利用改进欧拉法对方程进行求解；提出了将微分方程线性化的方法，同时设计了UPFC内部控制器并进行了仿真分析，结果表明UPFC不同控制器间存在负的相互作用。为检测引起UPFC不同控制通道间相互作用的原因，提出了一条判定准则，即在控制器输入输出配对关系正确的前提下，UPFC不同控制通道间的相互作用主要取决于UPFC的初始设定值或控制器的增益调节，并利用仿真验证了这个准则，同时得出了UPFC内部控制器的最佳配对关系。建立了装有UPFC的单机无穷大系统Phillips-Heffron模型，并利用阻尼转矩分析分析了UPFC向系统提供阻尼转矩的机理。利用相位补偿法设计了阻尼控制器，并利用可控性指标、仿真分析以及特征值分析对UPFC输入信号进行优化，得出最佳控制量是m_B和δ_E两个控制量，而以m_B较为好一些，同时提出了两个信号共同作用的双阻尼控制器。仿真结果表明，所设计的UPFC阻尼控制器不仅对单机无穷大系统有很好的系统鲁棒性，对四机两区域系统也有很好的阻尼控制效果。更多还原

【Abstract】 The unified power flow controller(UPFC) is one of the flexible AC transmission systems(FACTS) which can control power-system parameters such as terminal voltage,line impedance and phase angle to control power. flow,voltage,transient stability,damping oscillation etc.The UPFC is a multiple functional FACTS,so as its concept had been just put forward it attracted a growing interest in studying .The dissertation regarded studying the dynamic characteristic of UPFC as the main goal,it developed the research in three aspects: mathematical model,the reciprocity of internal controllers and the ability to damp system oscillations.First the dissertation summarized the research on current situation of UPFC and FACTS and its application situation in the project,and also introduced the research background of this subject.Then set up the dynamic model and power flow model of UPFC that can reduce the reciprocity of internal controllers of single UPFC.Put forward the control strategy of UPFC internal controllers,and proposed holding the active power P_b as the standard to minimize the mutual influence between controllers. Have derived the mathematical model of the single machine infinite bus power system installed with an UPFC. Designed the controller within UPFC and carried on simulation analysis at the same time, the result indicated that there is negative interaction among UPFC different controllers.In order to find the reason that caused the reciprocity among different channels,the paper proposed a criterion of judging and proved it with simulation analysis.Set up the Phillips-Heffron model of the single machine infinite bus power system installed with an UPFC, Utilize damping torque analysis analyzed mechanism of damping torque that UPFC offered to system,and used the phase compensation method to design the UPFC damping controllers. The result show that the UPFC damping controller designed either had fine and robust effect in single machine infinite bus or four machine two regional systems.更多还原