【作者】 刘建芳；

【导师】 高沁翔；

【作者基本信息】 北京交通大学 ， 电力电子与电力传动， 2007， 硕士

【摘要】 随着配电系统中各类非线性负荷的不断增加,特别是电力电子器件的广泛应用,系统中电能质量日益恶化;另一方面,越来越多的用户对电能质量提出了更高的要求,提高配电系统的电能质量已经倍受关注。在配电系统中的公共连接点安装统一电能质量控制器(UPQC),既可提高供电系统的电压质量和供电可靠性,又能抑制负载引起的各种电能质量问题向电网侧扩散,可以保证敏感负载获得高质量的电能供应,同时也提高和改善了配电系统的电能质量。文章以校“十五”专项科技基金课题“柔性供配电系统(配电FACTS,FACDS)”为研究背景,重点对用于配电系统的三相四线制统一电能质量控制器中的串联部分进行了理论研究和实验装置的研制,搭建了统一电能质量控制器的硬件平台,文中所设计的装置容量为10kVA。文章研究了统一电能质量控制器的拓扑结构与控制方法,分析了统一电能质量控制器对配电系统电压和负载电流的补偿原理,对统一电能质量控制器中的并联部分和串联部分的功能进行了分解,在此基础上建立了统一电能质量控制器中串联部分的数学模型。文中重点研究了统一电能质量控制器装置中串联部分的畸变电压检测方法以及系统的控制策略,采用了基于Park变换的电压畸变量检测方法,该种方法可以对电网电压的畸变进行小延时的检测,并且不需要通过硬件电路来获得电网电压的相位信息。文中对不同的PWM控制方式的优缺点进行了比较,采用了三角波比较法。文中采用MATLAB仿真软件搭建了三相四线制串联补偿系统的仿真模型,对不同的配电系统电压问题进行了仿真分析,证明了本检测方法的可行性。文章完成了统一电能质量控制器主电路的设计,并结合Pspice电路仿真工具对电路的参数进行了优化选择。设计了基于DSP TMS320F2812的全数字化控制系统,完成了串联部分的硬件电路设计与调试。文中采用C语言编写了相应的控制软件并对程序进行了优化,使程序能够在规定的时间内完成相应的检测和计算任务,以保证装置的运行稳定性和可靠性。最后文章对系统进行了实验研究,给出了实验波形,对实验结果进行了分析。更多还原

【Abstract】 With the development of power electronic technology and emergency of much non-linear load in power system, the power quality has been more and more deterioration. At the same time, customers’ requirements on the quality and reliability of electrical power supply grow higher and higher. Unified Power Quality Conditioner used in three-phase four-line system can effectively compensate multiple different power quality interferences originated either from the load side or from the line side, improve the reliability and quality of power supply.Unified Power Quality Controller as a promising Integrate Compensator has already attracted people’s widespread attention. This dissertation is a part of the project of Flexible Alterative Current Distribution System which is belongs to School Fifteenth Special Science and Technology Fund. This dissertation is focus on the study of series converter of Unified Power Quality Controller for three-phase four-line distribution power system which capacity is 10kVA.This dissertation presents topological structure and control strategies of Unified Power Quality Controller, analyzed UPQC’s Compensation Principle and amathematical model for UPQC’s series part. This dissertation focus on the study of Detection Method of Voltage distortion for UPQC’s series part and the Control Strategies. The dissertation finally chooses the Detection Method of Voltage distortion based on Park Transforms. analyze the advantage and disadvantage of different PWM control methods. developed whole system using Matlab/Simulink. Computer simulation results demonstrated that the proposed Detection Method of Voltage distortion is correct and valid.This dissertation also designs the parameters of UPQC’s series part main circuit and combination with simulation to optimize the parameters. A full digital control system based on DSP is built with TMS320F2812 and the hardware circuit of UPQC’s series part control system have been designed and tested. The control program is written by C language. Finally this dissertation does the experiments of UPQC’s series part, shows the experiment wave and analyses the experiment result.更多还原