The application of Voltage Sourced Converters (VSC) for HVDC began in the 1990s when cost-effective, high-voltage semiconductor switching devices capable of being turned on and off by control action at relatively high switching frequencies became available. The Insulated Gate Bipolar Transistor (IGBT) fulfilled these goals and thanks to its availability at ratings of several kV and several kA, voltage-sourced converters overtook a segment of the HVDC market for line-commutated converters (LCC) to become the dominant type of HVDC converter using HVDC cables during the decade 2010–2019. The early VSC schemes used two and three Level Converters using Pulse Width Modulation (PWM) techniques. These converters had relatively high losses compared with Line Commutated Converter (LCC) converters. Later Modular Multi-Level Converters (MMCs) were used for VSC HVDC schemes. These converters use staircase type modulation and have significantly lower losses and produce lower levels of harmonics than converters using PWM. Some significant applications of this technology are described in this chapter, which also describes how VSC HVDC technology can provide control features that improves the performance of the connected AC systems. Some of these HVDC systems were selected to illustrate the application of point-to-point VSC HVDC links.

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Point to Point VSC HVDC Scheme Examples

  • Thomas Magg,
  • Carsten Bartzsch,
  • Ting An,
  • Tongyue Sun

摘要

The application of Voltage Sourced Converters (VSC) for HVDC began in the 1990s when cost-effective, high-voltage semiconductor switching devices capable of being turned on and off by control action at relatively high switching frequencies became available. The Insulated Gate Bipolar Transistor (IGBT) fulfilled these goals and thanks to its availability at ratings of several kV and several kA, voltage-sourced converters overtook a segment of the HVDC market for line-commutated converters (LCC) to become the dominant type of HVDC converter using HVDC cables during the decade 2010–2019. The early VSC schemes used two and three Level Converters using Pulse Width Modulation (PWM) techniques. These converters had relatively high losses compared with Line Commutated Converter (LCC) converters. Later Modular Multi-Level Converters (MMCs) were used for VSC HVDC schemes. These converters use staircase type modulation and have significantly lower losses and produce lower levels of harmonics than converters using PWM. Some significant applications of this technology are described in this chapter, which also describes how VSC HVDC technology can provide control features that improves the performance of the connected AC systems. Some of these HVDC systems were selected to illustrate the application of point-to-point VSC HVDC links.