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TRIPOLAR VSC-HVDC TRANSMISSION SYSTEM AND METHOD

  • US 20160336751A1
  • Filed: 01/22/2015
  • Published: 11/17/2016
  • Est. Priority Date: 05/22/2014
  • Status: Active Grant
First Claim
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1. A tripolar VSC-HVDC system adopting three conductors to transmit DC power, the system comprising a rectifier and an inverter formed by a three phase six-bridge arms modular multilevel converter (MMC) respectively, midpoints of 1, 2, 3 phase units of the rectifier and inverter are connected with a secondary side of a converter transformer, and two converter valves of fully controlled semiconductor devices are arranged between poles 1 and 2 on the DC side of the rectifier and inverter respectively, anodes of the rectifier and inverter are connected with a pole 1 DC line by a smoothing reactor, cathodes of the rectifier and inverter are connected with a pole 2 DC line by a smoothing reactor, and connecting points of the upper and lower converter valves of the rectifier and inverter are connected with a pole 3 DC line by a smoothing reactor.

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