干式磁阀式可控电抗器的设计与分析

发布时间：2018-12-24 10:31

【摘要】：在电力系统中,无功补偿与无功平衡对于提高全网经济效益和改善供电质量至关重要。因此,新型无功补偿装置的研制与应用显然已成为电力系统中的重要研究课题。近年来新型无功补偿装置发展迅速,种类也日益增多。电网中现有的无功补偿装置主要包括同步调相机、晶闸管投切电容器(TSC)、晶闸管控制电抗器(TCR)、静止无功发生器(STATCOM)等。同步调相机由于其响应速度慢、运行维护困难等诸多缺点,目前已很少使用。晶闸管投切电容器无法实现无功功率的连续可调。晶闸管控制电抗器响应速度快、控制灵活,但由于晶闸管耐压水平的局限性,使得其在高压大容量场合的应用受到了限制,并且TCR在工作过程中会产生大量的谐波电流,需要加装滤波装置。静止无功发生器响应速度快、控制灵活、占地面积小,但其价格昂贵、维护困难,在超(特)高压电网中并没有得到广泛的应用。磁阀式可控电抗器是一种通过改变控制回路直流励磁电流的大小,进而改变铁心的磁饱和程度,达到平滑调节无功容量输出的新型无功补偿装置。这种可控电抗器具有电压范围广、响应速度快、谐波含量低等优点,对于提高电网的输电能力、调节电网电压、补偿无功功率以及限制操作过电压都具有无与伦比的应用潜力。首先,本文概述了磁阀式可控电抗器的发展历史、研究现状及其应用前景,并简要介绍了磁阀式可控电抗器的基本结构、工作原理和数学模型,同时指出了磁阀式可控电抗器的诸多优点。其次,本文详细给出了干式磁阀式可控电抗器的设计计算公式,推导了在不同饱和度下磁阀式可控电抗器工作电流的解析表达式,并利用Matlab编程仿真分析了磁阀参数对工作电流畸变率的影响。再次,本文利用Ansoft软件建立了10kV磁阀式可控电抗器的二维有限元模型,分析了不同工况下工作绕组电流的谐波含量,并与解析法得出的各次谐波含量进行对比,验证了解析法计算结果的正确性。最后,本文利用Matlab GUI工具开发了一套干式磁阀式可控电抗器的设计计算软件。该软件集参数设置和计算仿真于一体,软件界面友好,并能实现工作电流谐波分析,设计精度满足工程要求。本文的工作将为干式磁阀式可控电抗器的设计打下坚实的基础。
[Abstract]:In power system, reactive power compensation and reactive power balance are very important to improve the economic benefit and the quality of power supply. Therefore, the development and application of a new type of reactive power compensator has become an important research topic in power system. In recent years, the new type of reactive power compensator is developing rapidly and the variety is increasing day by day. The existing reactive power compensation devices mainly include synchronous regulator, thyristor switched capacitor, (TSC), thyristor control reactor, (TCR), static var generator, etc. Synchronous camera is rarely used because of its slow response speed, difficult operation and maintenance. Thyristor switching capacitors can not achieve continuous adjustable reactive power. Thyristor control reactor has fast response speed and flexible control. However, because of the limitation of thyristor voltage level, its application in high voltage and large capacity situation is limited, and TCR will produce a lot of harmonic current in the working process. Filter devices need to be installed. Static Var Generator (SVG) is fast in response, flexible in control and small in area, but it is expensive and difficult to maintain, so it has not been widely used in ultra-high voltage (UHV) power system. Magnetic valve controllable reactor is a new type of reactive power compensation device which can adjust the output of reactive power capacity smoothly by changing the magnitude of DC excitation current in the control circuit and then changing the magnetic saturation degree of the core. This controllable reactor has the advantages of wide voltage range, fast response speed and low harmonic content. It has unparalleled application potential for improving power transmission capacity, regulating network voltage, compensating reactive power and limiting operating overvoltage. Firstly, this paper summarizes the development history, research status and application prospect of magnetic valve controllable reactor, and briefly introduces the basic structure, working principle and mathematical model of magnetic valve controllable reactor. At the same time, the advantages of magnetic valve controlled reactor are pointed out. Secondly, the design and calculation formula of the dry magnetic valve controllable reactor is given in detail, and the analytical expression of the working current of the magnetic valve controllable reactor under different saturation is derived. The effect of magnetic valve parameters on the working current distortion rate is analyzed by Matlab programming. Thirdly, the two-dimensional finite element model of 10kV magnetic valve controllable reactor is established by using Ansoft software. The harmonic content of working winding current under different working conditions is analyzed and compared with the harmonic content obtained by analytical method. The correctness of the analytical method is verified. Finally, a design and calculation software of dry magnetic valve controlled reactor is developed by using Matlab GUI tool. The software integrates parameter setting and calculation and simulation. The interface of the software is friendly, and the harmonic analysis of working current can be realized, and the design precision can meet the requirements of engineering. The work of this paper will lay a solid foundation for the design of dry magnetic valve controlled reactor.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM47

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