中文摘要：

针对高压大容量模块化多电平换流器（modularmultilevel converter,MMC）的阀基控制技术策略,研究基于禁忌搜索优化算法的子模块电容电压平衡控制策略。以高压大容量柔性直流输电系统为应用背景,对MMC技术及其阀基控制技术进行分析研究,通过对MMC技术子模块电压平衡策略的研究,提出了子模块电容电压平衡算法的评判指标,并对子模块脉冲分配投切机理进行了深入的分析研究;在分布式系统架构基础上,提出了一种新颖的适用于高压大容量柔性直流输电系统阀基控制技术的禁忌搜索优化算法子模块电压平衡策略模型;该模型以子模块投切代价和能量波动为基础,通过子模块关键参数五元组信息树,建立目标函数和约束条件,以禁忌搜索优化算法建立了状态决策优化模型,并编制了优化算法流程;通过PSCAD/EMTDC仿真软件及柔性直流动态模拟试验平台对此优化模型进行了仿真试验和离线试验,结果表明,该方法与传统的最近电平逼近调制策略在各项评判指标的对比上,都具备很好的功能有效性和性能可靠性;为百兆级以上高压大容量柔性直流输电工程阀控技术提供了理论支持和工程依据。

英文摘要：

This paper is written on the valve base control strategy specifically for high-voltage large-capacity modular multi-level converter（MMC） and on the sub-module capacitor voltage balance control strategy using tabu search optimization algorithm.In the context of high-voltage large-capacity VSC-HVDC transmission system,the paper analyzes MMC topology and related valve base control technique.The criteria for sub-module capacitor voltage balance algorithm are brought forward;the switching principle of sub-module pulse distribution is given in-depth study.Based on a distributed system structure,a novel sub-module voltage balance model using tabu search optimization algorithm is presented applicable to VSC-HVDC valve base control technique.In order to set up the objective function and constraints,establish the state decision optimization model,and formulate the optimization algorithm process,this model considers various factors,such as sub-module switchon/off,energy fluctuations,and key parameters quintuple information tree.Simulation test and off-line test were carried out on the dynamic simulation platform employing PSCAD/EMTDC software.The test results showed that this approach was as good as nearest level approximation in terms of functionality and performance reliability,thus providing theoretical support and engineering basis.