【作者】 王超；

【导师】 万健如； 张建民；

【作者基本信息】 天津大学 ， 控制工程， 2008， 硕士

【摘要】 随着电网中越来越多的非线性负载的投入使用,电能质量问题日益严重。电网中存在谐波、无功、电压闪变及负序电流等问题,严重影响电能质量,危害电力设备。传统解决电能质量问题的措施往往只能消除某个方面的危害。随着电力电子技术和控制技术迅速发展,统一电能质量调节器(UPQC)和统一潮流控制器等综合电能质量管理装置的研究与应用日趋成熟,有望全面提高电网电能质量。其中由串、并联双变流器组成的统一电能质量调节器具有综合的电能质量调节能力,不仅可以改善电网输入电流的电能质量问题,也可以改善负载输入电压的电能质量问题。电能质量综合调节技术是以电力电子技术为基础,属于用户电力技术的重要内容之一。UPQC改变了电能质量治理中传统电压或电流波形分别补偿的方法,整体适应系统电流和电压的补偿要求,具有较远的发展前景。本文通过对改善供电电能质量实际出发,深入研究UPQC的理论、拓扑结构、补偿分量的实时检测和控制策略研究。本文介绍了有源电力滤波器目前存在的问题及发展现状,在分析有源电力滤波器的基本原理的基础上给出UPQC装置的主电路拓扑结构,并对其工作原理进行了详细的说明;对电压和电流畸变分量的实时检测和计算方法及UPQC的补偿控制策略进行分析研究,并对其进行了仿真实验,结果表明文中所提的控制策略有较好的补偿效果。更多还原

【Abstract】 With the applications of more and more power electronics equipments, the power quality issues become more and more severe.. Harmonics, reactive power, voltage flicker and negative-sequence current of power grids can affect the power quality and harm the power equipment badly. Traditional methods only can settle power quality problems partially. As the electronics and control technique develop rapidly, unified power quality management equipments included unified power quality conditioner and unified power flow conditioner become more mature and available, which are expected to improve power quality generally. The unified conditioning technology of power quality, based on power electronic technology, is one of all important branches of custom power. Unified Power Quality Conditioner(UPQC),composed of a parallel and series conversion system is of the general ability to adjust power energy. It can not only improve the network current quality but also the load voltage quality. Traditionally, the device for power quality conditioner can compensate distorted voltage wave form and current wave form respectively. However, UPQC, which has capacity of simultaneously coordinating voltage and current wave form compensation and satisfy the demand of the power consumer and supply system, must have a prospective future. This paper, based on practice of improvement of power quality, deals with the theory, topology, real-time algorithm for distorted wave form, compensation strategy, control strategy for loop system.This paper, at first, introduces the development actuality and present problem existed. On the base of analysing the principle of the active power filter, introduces the topological configuration and principle of UPQC; the following studies on real-time detection of distorted component of current and voltage wave form, and the compensation control strategy and simulation of UPQC. The result shows that the control strategy which referred in the paper has better effect.更多还原