电网技术2017，Vol.41Issue(3)：729-735,7.DOI:10.13335/j.1000-3673.pst.2016.1301
模块化多电平换流器电容电压新型优化平衡方法
A Novel Optimized Capacitor Voltage Balancing Method for Modular Multilevel Converter
魏新伟 1粟时平 1邱欣 1易浩民 1李琳 1施灵卫1
作者信息
- 1. 电力系统安全运行与控制湖南省高校重点实验室(长沙理工大学),湖南省 长沙市 410114
- 折叠
摘要
Abstract
Aiming at problem of large calculation amount and high switching frequency existing in traditional capacitor voltage balancing method, a novel balancing optimization method for DC capacitor voltage in MMC-HVDC system is proposed. Firstly, existing problems in traditional sorting algorithm are analyzed, and the optimization method is given. Randomized selection algorithm is proposed for MMC voltage balancing, able to greatly improve sorting efficiency. On this basis, capacitor voltage balance optimization method is proposed, making MMC controller avoid sorting and maintaining trigger pulse unchanged in control cycle when capacitance voltages experiences small change. Capacitor voltages are sorted with randomized selection algorithm with higher efficiency according to introduced renewed sort criterion. Thus calculation amount of controller can be further decreased, and device loss of converter valve can be effectively reduced. Finally, feasibility and effectiveness of the proposed optimization method is verified with Matlab/Simulink simulation.关键词
模块化多电平换流器/电容电压平衡/随机选择算法/开关频率/优化效率Key words
modular multilevel converter (MMC)/capacitor voltage balance/randomized selection algorithm/switching frequency/optimization efficiency分类
信息技术与安全科学引用本文复制引用
魏新伟,粟时平,邱欣,易浩民,李琳,施灵卫..模块化多电平换流器电容电压新型优化平衡方法[J].电网技术,2017,41(3):729-735,7.
