统一潮流控制器（UPFC）的智能潮流控制方法研究

【作者】 杨琪；

【导师】 王辉；

【作者基本信息】 湖南大学 ， 电力电子与电力传动， 2003， 硕士

【摘要】 灵活交流输电系统(FACTS)是电力电子技术在电力交流输电系统中应用的一个重要方面，它能使现有的电网资源得到充分的利用，并实现电能的高效利用。这一新技术将会引起电力输送和分配方面的重大变革，成为二十一世纪电力革命性的前沿技术。其中，统一潮流控制器(UPFC)是灵活交流输电系统装置中的一个典型器件，能分别或同时实现电压、阻抗，相角及有功和无功的调节控制，是一种最复杂也是最灵活的FACTS控制器。 论文首先分析了UPFC的动静态数学模型，介绍了UPFC的基本控制特性和控制系统结构，并提出了UPFC的潮流调节特性及控制的基本原则和分级控制策略。 论文对UPFC的构成器件CC-PWM变换器进行研究，讨论了PWM整流器的控制策略。在传统的PWM整流控制的基础上，论文利用开关函数建模法，提出了基于预测电流的PWM电压空间矢量控制方法。针对PWM这样过程复杂且参数时变的系统，论文确定了一个具有自适应功能的智能模糊PID控制器，大大提高了系统的响应时间，对提高整流器的控制效果与鲁棒性有很大的作用。 在传统PID控制方案的基础上，论文提出了UPFC的神经网络智能潮流控制方案，设计了人工神经网络潮流控制器，取得了很好的效果；并且将模糊逻辑与神经网络相结合，设计了模糊神经网络潮流控制器，仿真结果表明，与传统的PID控制器相比，这两种智能控制器在系统响应和动静态性能上都有很大的提高。更多还原

【Abstract】 Flexible AC Transmission System or FACTS is an important aspect of the power electronic technology application in power ac transmission system. It can make the present power grid resource into great use and can realize the best utility of power energy. Therefore this new technology may cause the great reform on power transmission and distribution system in the future. Unified Power Flow Controller, a typical and the most flexible controller of FACTS, can control concurrently or selectively the transmission line voltage, impedance and angle or alternatively, the real and reactive power flow in the line.The steady and dynamic mathematic models of UPFC are investigated, and the basic control performances and the control system structure are also discussed in this paper. Then the UPFC power flow control characteristics and the fundamental principles of UPFC control arc put forward.Current Control of the PWM (CC-PWM) converter, one of the devices in UPFC, is studied and the control scheme of PWM rectifier is discussed in this paper. Based on the traditional control on PWM rectifier, space vector PWM predictive current controller is presented using the switching function model. For the system as complex and changeable as PWM, a self-adaptive intelligent fuzzy PID controller is used, which is verified that it decreases the response time of the system sharply and does a great help to better the control performance and robust of PWM rectifier.Furthermore, the neutral network intelligent power flow controllers are proposed on the basis of traditional PID control for the study of UPFC power flow control. The artificial neutral network power flow controller and the fuzzy neutral network power flow controller with the combination of fuzzy logic and neutral network system are designed in this paper. And the simulation results show that these two intelligent controllers are better than the PID controller by comparing the response time and the steady and dynamic performances.更多还原