船舶中压直流电力系统中模块化多电平逆变器的谐波性能仿真研究

Simulation study of harmonic characteristics of modular multilevel converter in medium voltage DC power system on ship

    摘要
  • 摘要:
      目的  对船舶中压直流（MVDC）电力系统而言，模块化多电平逆变器（MMC）的应用是目前研究的热点。MMC的输出电压波形是否为正弦波将直接决定MVDC电网和负载的工作性能，因此改善MMC的谐波性能显得尤为重要。
      方法  首先，以船舶MVDC电力系统为背景，研究MMC的谐波特性与电压等级、桥臂子模块（SM）数量之间的关系；然后，针对控制器采样周期、载波频率、调制比和桥臂电感值等参数对MMC逆变器谐波性能的影响，开展仿真对比分析。
      结果  研究结果表明：较高电压等级的MMC应配置较多的子模块；当明确MMC子模块的数量后，调制比和采样周期是MMC谐波特性的主要影响因素。
      结论  所得结论可为中压型MMC逆变器的参数设计提供决策依据。

     

    Abstract:
      Objectives  For a Medium Voltage Direct Current(MVDC) power system on a ship, the application of the Modular Multilevel Converter(MMC)is a hot research topic. Whether the output voltage waveform of the MMC is a sine wave will directly determine the working performance of the MVDC power grid and load, so it is particularly important to improve the harmonic performance of the MMC.
      Methods  First, based on the MVDC power system of a ship, the interactions between the harmonic characteristics, voltage level and number of bridge arm Sub-Modules(SMs)of the MMC inverter are studied. Next, the harmonic variation tendency of the MMC under the influence of the sampling period, carrier wave frequency, modulation ratio and arm inductance are studied in detail.
      Results  It is found that a higher voltage grade MMC needs to be equipped with a larger number of SMs. When the number of SMs is given, the sampling period and modulation ratio play major roles in the harmonic improvement of the MMC.
      Conclusions  The results of this paper can provide valuable references for selecting the parameter design of medium pressure MMC inverters.

     

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