【作者】 陈汉雄；

【导师】 刘天琪；

【作者基本信息】 四川大学 ， 电力系统及其自动化， 2003， 硕士

【摘要】 为了解决我国资源分布与电力负荷之间布局不均衡的状况，国家实施了“西电东送”和全国联网的发展战略，由于直流输电在远距离大容量送电和电网互联等方面本身具有的特点与优势，因此我国的“西电东送”工程和全国联网，都将直流输电工程纳入整体规划方案。届时，直流输电将在我国西电东送，全国联网以及和周边国家的联网送电中得到更大的发展和发挥越来越重要的作用，而我国的电网也将成为多馈入交直流混合大系统。因此研究高压直流输电控制对整个交直流混合系统稳定性影响的问题与多馈入交直流混合系统中各控制元件之间的协调问题必将变得现实而具体。 目前，高压直流输电系统中常用的控制方法仍是基于状态方程的经典控制理论。在一定范围内，虽然它们具有一定的适应性和鲁棒性，但实际的交直流混合系统是一个典型的强非线性、时变系统，其运行方式不断变化，而且还伴有很多不确定因素，因此仅靠线性或非线性控制理论来维持交直流系统在所有运行工况下有好的运行性能是有相当难度的，必须将控制理论与人工智能结合起来，即进行人工智能控制，而模糊控制是人工智能控制理论中的一个重要分支。 本文第一章首先概述了高压直流输电系统的发展、国内外交直流输电系统的研究现状及存在问题。 第二章概述了高压直流输电系统的控制原理和控制特性，同时给出了交直流输电系统的数学模型。 第三章针对直流输电系统本身的特点并结合模糊智能推理，在HVDC的换流站增加辅助模糊控制，其目的是利用直流输电系统来提高和改善本身的运行性能、提高交直流系统的暂态稳定性。 第四章着重研究如何利用直流输电系统来提高交流系统的稳定性，本章按照基于后件函数的模糊逻辑推理，设计了一个提高交直流混合系统阻尼特性的模糊控制器，其目的是改善和提高交流系统在受到干扰后交流系统的动态性能和阻尼特性。 第五章针对在包含多条直流线路的交直流馄合系统中，各控制元件的设计目标只是满足某局部的要求而相互之间缺乏统一与协调的问题，按照模糊智能推理方法与最优分散协调控制算法设计出智能模糊分散协调控制器，重点研究了在多馈入交直流混合系统中如何在众多的控制元件之间实现协调从而使系统总体性能实现最优的问题。更多还原

【Abstract】 With the development of power system and our country’s economy, Our country will implement the developing strategy of "the west power transmitted to the east area". At that time, several HVDC transmission lines will be built, there will appear large and complicated AC/DC Systems in our country. It will be practice and concrete of studying the problem of the HVDC control affecting the whole AC/DC systems’ stability and the problem of the coordination among the many controllable components in the multi-infeed AC/DC systems.At present, the control method in HVDC systems is still the typical control theory based on the state equations. Although the traditional method has adaptability and robust to some extent, the dynamic characters of the actual system are not always satisfactory because that the actual AC/DC mixed systems are typical nonlinear and time-varying systems. So the classic control theory should integrate with the artificial intelligent technique in order to improve the dynamic characters of the whole AC/DC systems. The fuzzy logic control technique is one of the important branches of artificial intelligent technique.The AC/DC control problems and the background of this thesis are summarized in the first chapter, as well as the development of HVDC technique.In chapter 2, the control theory and the control method of HVDC system and its mathematic model are presented.In chapter 3, according to the characters of HVDC system, the auxiliary fuzzy logic control is added to the inverter in HVDC system by fuzzy logic reasoning in order to maintain invariance and stability of the direct current and improve the transient performance of the AC system.The study of how to use the HVDC system to improve the stability of AC system is stressed in chapter 4. In terms of the fuzzy logic reasoning based on the back function, a fuzzy logic controller is designed to improving the dynamic characters and enhancing the damping of AC system.In virtue of the fuzzy logic reasoning method and the algorithm of optimal decentralize and coordination, a intelligent fuzzy and decentralized and coordinated controller is designed in chapter 5, the controller is used to settle the coordination problem among the many controllable components and achieve the object that the minimal dynamic index of the whole AC/DC system.更多还原