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VSC transmission system using flying capacitor multilevel converters and hybrid PWM control

机译:使用飞跨电容器多电平转换器和混合PWM控制的VSC传输系统

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摘要

A high-voltage direct current (HVDC) transmission system based on three-level flying capacitor (FC) multilevel converters with hybrid pulse-width modulation (PWM) is presented in this paper. Selective harmonic elimination PWM (SHE-PWM) is used during normal operating conditions and is switched to phase-shifted sinusoidal PWM (PS-SPWM) during an asymmetric network fault. The generation of the switching patterns under SHE-PWM control for each power device is described taking into account the natural balancing of the FC voltages. A new and simple control method for balancing the FC voltages when using SHE-PWM is proposed which is based on the small change of the firing angle according to the polarity of the load current. The FC voltage ripple under SHE-PWM control is estimated and compared to that under PS-SPWM. A method to implement the proposed hybrid PWM with capacitor voltage balancing is also provided. Simulation studies on a 300-MW/plusmn150 kV voltage-source converter transmission system are presented to confirm the satisfactory performance of the proposed system under active and reactive power variations and single-phase fault conditions.
机译:本文提出了一种基于三级飞移电容器(FC)多级转换器和混合脉宽调制(PWM)的高压直流输电系统。选择性谐波消除PWM(SHE-PWM)在正常工作条件下使用,在非对称网络故障期间切换为相移正弦PWM(PS-SPWM)。考虑到FC电压的自然平衡,描述了在每个SHE-PWM控制下为每个功率设备生成开关模式的过程。提出了一种新的,简单的控制方法,该方法用于在使用SHE-PWM时平衡FC电压,该方法基于点火角根据负载电流的极性的微小变化。估算了SHE-PWM控制下的FC电压纹波,并将其与PS-SPWM下的相比较。还提供了一种利用电容器电压平衡实现提出的混合PWM的方法。提出了对300 MW / plus150 kV电压源换流器传输系统的仿真研究,以确认该系统在有功和无功功率变化以及单相故障条件下的令人满意的性能。

著录项

  • 作者

    Xu L.; Agelidis V.G.;

  • 作者单位
  • 年度 2007
  • 总页数
  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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