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作 者:刘汉军 张军 盛俊毅 汤明杰 郭妍妍 LIU Hanjun;ZHANG Jun;SHENG Junyi;TANG Mingjie;GUO Yanyan(TBEA Xi’an Flexible Power T&D Co.,Ltd.,Xi’an 710000,China)
机构地区:[1]特变电工西安柔性输配电有限公司,西安710000
出 处:《南方电网技术》2024年第3期111-118,共8页Southern Power System Technology
基 金:国家重点研发计划资助项目(2016YFB0901003)。
摘 要:模块化多电平换流器(MMC)包含的功率器件多、桥臂电流大,导致电压源换流器单元运行损耗大,直接影响系统的经济性。针对该问题提出了一种功率模块开关损耗降低策略,通过降低桥臂电流较大区域的开关次数减少开关损耗,通过增大桥臂电流较小区域的开关次数抑制模块电压波动,最后以昆柳龙工程柳北站电压源换流器单元为例,通过PSCAD仿真和RTDS试验验证了降损策略的有效性,显著降低了功率模块开关损耗,提高了系统效率。Modular multilevel converter(MMC)contains many power devices and large bridge arm current,which leads to large VSC unit operation loss and directly affects the system economy.To solve this problem,this paper proposes a strategy to reduce the switching loss of power modules,which reduces the switching loss by reducing the switching times in the area with higt bridge arm current,and suppresses the voltage fluctuation of modules by increasing the switching times in the area with low bridge arm current.Finally,taking the VSC unit in Liubei Station of Kunliulong Project as an example,the effectiveness of the loss reduction strategy is verified through PSCAD simulation and RTDS test,which significantly reduces the switching loss of power modules,and the system efficiency is improved.
关 键 词:模块化多电平变流器 功率损耗计算 开关损耗 排序算法
分 类 号:TM723[电气工程—电力系统及自动化]
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