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Voltage Balancing Method on Expert System for 51-Level MMC in High Voltage Direct Current Transmission

机译：高压直流输电51级MMC专家系统的电压平衡方法

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摘要

The Modular Multilevel Converters (MMC) have been a spotlight for the high voltage and high power transmission systems. In the VSC-HVDC (High Voltage Direct Current based on Voltage Source Converter) transmission system, the energy of DC link is stored in the distributed capacitors, and the difference of capacitors in parameters and charge rates causes capacitor voltage balance which affects the safety and stability of HVDC system. A method of MMC based on the expert system for reducing the frequency of the submodules (SMs) of the IGBT switching frequency is proposed. Firstly, MMC with 51 levels for HVDC is designed. Secondly, the nearest level control (NLC) for 51-level MMC is introduced. Thirdly, a modified capacitor voltage balancing method based on expert system for MMC-based HVDC transmission system is proposed. Finally, a simulation platform for 51-level Modular Multilevel Converter is constructed by using MATLAB/SIMULINK. The results indicate that the strategy proposed reduces the switching frequency on the premise of keeping submodule voltage basically identical, which greatly reduces the power losses for MMC-HVDC system.
机译：模块化多电平转换器（MMC）已成为高压和高功率传输系统的关注焦点。在VSC-HVDC（基于电压源转换器的高压直流电）传输系统中，直流母线的能量存储在分布式电容器中，并且电容器的参数和充电率不同会导致电容器电压平衡，从而影响安全性和可靠性。高压直流输电系统的稳定性。提出了一种基于专家系统的MMC降低IGBT开关频率子模块（SM）频率的方法。首先，设计了用于HVDC的51级MMC。其次，介绍了用于51级MMC的最近级控制（NLC）。第三，针对基于MMC的高压直流输电系统，提出了一种基于专家系统的改进的电容器电压平衡方法。最后，使用MATLAB / SIMULINK构建了51级模块化多电平转换器的仿真平台。结果表明，所提出的策略在保持子模块电压基本相同的前提下降低了开关频率，从而大大降低了MMC-HVDC系统的功耗。

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  • 来源
    《Mathematical Problems in Engineering》 |2016年第5期|2968484.1-2968484.6|共6页
  • 作者

    Chen Yong; Zhang Xu;

  • 作者单位

    Univ Elect Sci & Technol China, Sch Energy Sci & Engn, Chengdu 611731, Peoples R China|Univ Adelaide, Ctr Energy, Adelaide, SA 5005, Australia;

    Univ Elect Sci & Technol China, Sch Energy Sci & Engn, Chengdu 611731, Peoples R China;

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