H桥级联的高压有源电力滤波器的研究

发布时间：2018-11-04 08:56

【摘要】：如今电力电子技术应用日益广泛,同时也带来了严重的谐波污染,对电网的安全运行造成了严重的危害。有源电力滤波器(APF)已经被用来缓解电网的谐波污染。在高压大功率应用场合,功率开关管的工作电压与开关频率的要求往往是相互矛盾的,载波相移(CPS-SPWM)技术和H桥级联型多电平技术能够较好的解决了这个问题。本文对基于载波相移SPWM技术的H桥级联型多电平变流器将其在有源电力滤波器中的应用做了一些研究。本文介绍了载波相移SPWM技术的基本原理,对该技术的输出电压波形和倍频等特点进行了分析。H桥级联型多电平变流器有着每个H桥电路单元相同易于实现模块化设计、所用的器件较少、低压器件实现高压输出等优点。本文将详细分析载波相移SPWM技术应用于H桥级联型多电平变流器中的谐波特性和其工作方式,它在有源电力滤波器和大功率变流器领域将有着较广泛的应用前景。本文以H桥级联型多电平变流器作为并联型有源电力滤波器的主电路,介绍了基于瞬时无功功率理论的谐波检测方法及其衍生算法,电流跟踪策略及直流侧电压的稳定和均压控制,在MATLAB中建立仿真模型加以验证。本文设计了基于载波相移SPWM技术的H桥级联型有源滤波器的实验装置,给出了实验装置主要参数的设计过程,实验验证了低压的自稳压控制,实验装置的下一步研究计划是在高电压场合实现自稳压并且精确的补偿谐波。
[Abstract]:Nowadays, power electronics technology is widely used, but also brings serious harmonic pollution, which causes serious harm to the safe operation of power grid. Active power filter (APF) has been used to mitigate harmonic pollution in power grid. In high-voltage and high-power applications, the working voltage and switching frequency of power switches are often contradictory. Carrier phase shift (CPS-SPWM) technology and H-bridge cascaded multilevel technology can solve this problem. In this paper, the application of H-bridge cascaded multilevel converter based on carrier phase-shifted SPWM technology in active power filter is studied. In this paper, the basic principle of carrier phase-shifted SPWM technology is introduced, and the characteristics of output voltage waveform and frequency doubling of this technique are analyzed. The H-bridge cascaded multilevel converter has the same and easy to realize modularization design for each H-bridge circuit unit. There are few devices used, and low voltage devices can achieve high voltage output. In this paper, the harmonic characteristics and operation mode of carrier phase-shifted SPWM technology in H-bridge cascaded multilevel converters are analyzed in detail. It will have a broad application prospect in the field of active power filters and high-power converters. In this paper, the H-bridge cascaded multilevel converter is used as the main circuit of shunt active power filter. The harmonic detection method based on instantaneous reactive power theory and its derivation algorithm are introduced. The current tracking strategy, the stability of DC side voltage and the voltage sharing control are verified by establishing a simulation model in MATLAB. In this paper, an experimental device of H-bridge cascaded active power filter based on carrier phase-shifted SPWM technology is designed. The design process of the main parameters of the experimental device is given, and the self-stabilizing voltage control of low voltage is verified experimentally. The next research plan of the experimental device is to realize self-stabilizing voltage and accurate harmonic compensation in high voltage field.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM761

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