基于双队列的模块化多电平换流器子模块调制方法

LIU Zhengfu

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基于双队列的模块化多电平换流器子模块调制方法

更新时间：2025-08-13

- 基于双队列的模块化多电平换流器子模块调制方法
- Automation of Electric Power Systems Vol. 42, Issue 2, Pages: 77-83(2018)
- 作者机构：
  
  广东电网有限责任公司电力科学研究院,广东省,广州市,510080
- 作者简介：
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- Published：2018
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LIU Zhengfu. [J]. Automation of electric power systems, 2018, 42(2): 77-83.
DOI：

LIU Zhengfu. [J]. Automation of electric power systems, 2018, 42(2): 77-83. DOI：

摘要

模块化多电平换流器的子模块调制技术是该拓扑的主要技术难点之一。传统策略中，需实时检测桥臂所有子模块的电容电压，并进行全排序。若子模块数量较多，会对控制器性能产生较高要求，并产生控制延时，影响换流器安全稳定运行。为此，提出了一种基于双队列的模块化多电平换流器调制方法。在初始时刻建立桥臂的投入队列和切除队列，电平变化时根据当前时刻桥臂电流的方向及桥臂子模块的最大电压偏差，对上一时刻的投入队列和切除队列进行调整。该方法无需对子模块电容电压进行排序，在保持较低开关频率的基础上大大降低了系统运算时间。在PSCAD/EMTDC中搭建了相应的仿真模型，仿真结果证明了该策略的可行性和有效性。

Abstract

The modulation method for sub-modules(SMs)of modular multilevel converter(MMC)is one of the most important issues in practical engineering. In traditional strategy

the capacitor voltages of SMs need to be detected in real time and ranked in total order. If the number of SMs increases

the requirement of calculating time rises accordingly and the safe and stable operation of converter may be influenced. Hence

a modulation method based on dual queues for MMC is proposed. The on-state queue and off-state queue are established at the initial time and adjusted according to the direction of arm current and the maximum voltage margin during the operation. The capacitor voltages of SMs need not to be sorted in this method and the calculating time can be reduced. The simulation model is developed in PSCAD/EMTDC

and the simulation results prove the validity and the feasibility of the proposed method.

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