基于混合式MMC的混合高压直流输电系统启动策略

ZHAO Wenqiang

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基于混合式MMC的混合高压直流输电系统启动策略

更新时间：2025-08-13

- 基于混合式MMC的混合高压直流输电系统启动策略
- Automation of Electric Power Systems Vol. 42, Issue 7, Pages: 62-70(2018)
- 作者机构：
  
  南京南瑞继保电气有限公司,江苏省,南京市,211102
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- Published：2018
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ZHAO Wenqiang. [J]. Automation of electric power systems, 2018, 42(7): 62-70.
DOI：

ZHAO Wenqiang. [J]. Automation of electric power systems, 2018, 42(7): 62-70. DOI：

摘要

针对与有源系统相联的混合直流输电系统，以全桥子模块和半桥子模块混合的模块化多电平换流器(MMC)为例，详细分析了其预充电启动过程，给出了每个阶段直流电压的一般数学表达式，从数学上证明了其与半桥子模块或全桥子模块构成的MMC的内在联系。分析了基于全桥子模块和半桥子模块混合的MMC在不同混合比例下其预充电过程中可能存在的过压或欠压问题，提出了5种解决措施。同时就混合直流输电系统运用于向无源系统供电和作为“黑启动”电源的应用场合，分析了其预充电启动过程，并提出了具体实现方法。最后通过PSCAD/EMTDC对相关分析进行了仿真验证。

Abstract

For a hybrid high voltage direct current(HVDC)transmission system connected to the active power grid

the pre-charging and start-up process of the half-bridge sub-module and full-bridge sub-module based hybrid modular multilevel converter(MMC)is analyzed in detail. The general mathematical expressions of DC voltage in each stage are derived

and the internal relation between the hybrid MMC and the MMC composed of half-bridge sub-module or the full-bridge sub-module is justified mathematically. The over-voltage and under-voltage problems in the pre-charging process for the hybrid MMC under the different mix proportions are analyzed

and five feasible measures are proposed. Meanwhile

for the hybrid HVDC applied to the passive system and the application for black start

the pre-charging and start-up process are analyzed

and the concrete implementation method is proposed. Finally

the proposed strategy is verified by PSCAD/EMTDC simulation.

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