Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter

YANG Wenbo; SONG Qiang; LIU Wenhua; XU Shukai; RAO Hong; ZHU Zhe

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Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter

更新时间：2025-12-08

- Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter
- Vol. 44, Issue 7, Pages: 2205-2212(2018)
- 作者机构：
  
  1. 清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室
  2. 南方电网科学研究院直流输电技术国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 July 2018，
  
  Published：2018
- 稿件说明：
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YANG Wenbo, SONG Qiang, LIU Wenhua, et al. Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter[J]. 2018, 44(7): 2205-2212.
DOI：

YANG Wenbo, SONG Qiang, LIU Wenhua, et al. Hybrid High-voltage Direct-current Transmission System Based on Unidirectional Current Modular Multilevel Converter[J]. 2018, 44(7): 2205-2212. DOI：

摘要

为了解决现有电网换相换流器（LCC）与模块化多电平换流器（MMC）组成的混合高压直流（HVDC）输电系统采用半桥MMC时不具有直流侧故障清除能力、采用全桥MMC时成本过高的问题

提出了一种使用新型的电流单向型MMC与LCC连接构成的混合直流输电系统。构建了单极800 k V/2 500 MW的双端系统模型

对其启动过程、典型故障过程和功率反转过程进行了仿真

结果表明提出的混合系统具有可行性、直流故障清除能力、短时无功支撑能力和双向功率传输能力。

Abstract

A hybrid high-voltage direct-current（HVDC） transmission system composed of line commutated converter（LCC） and modular multilevel converter（MMC） cannot clear a dc-side short fault if the half-bridge MMC is adopted

and has a high cost if the full-bridge MMC is adopted. We proposed a novel hybrid HVDC transmission system composed of LCC and unidirectional current H-bridge MMC in order to solve this problem. An 800 k V/2 500 MW unipolar two-terminal system model was built. The startup

typical faults

and power reversal processes were simulated. The results verify that the proposed hybrid system possesses the feasibility

DC-side short fault clearance capability

short-term reactive power support capability

and bidirectional power transmission capability.

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