混合式MMC直流故障穿越特性影响因素研究  

Research on Influencing Factors of Hybrid MMC DC Fault Ride Through Characteristics

作　　者：马焕 杨美娟 王先为[3] 吴金龙[3] 李道洋 MA Huan;YANG Mei-juan;WANG Xian-wei;WU Jin-long;LI Dao-yang(Xi'an Xuji Power Electronic Technology Co.,Ltd.,Xi'an 710075 China;Xuji Electric Co.,Ltd.,Xuchang 461000 China;Xuji Group Co.,Ltd.,Xuchang 461000 China)

机构地区：[1]西安许继电力电子技术有限公司,陕西西安710075 [2]许继电气有限公司,河南许昌461000 [3]许继集团有限公司,河南许昌461000

出　　处：《自动化技术与应用》2023年第10期189-194,共6页Techniques of Automation and Applications

摘　　要：混合式MMC利用全桥子模块的负压特性实现直流故障不闭锁穿越,由于直流故障穿越特性是考核换流阀设备与控制保护系统性能的重要指标,因此首先对混合式MMC直流故障穿越特性影响因素及其影响机理进行理论分析,主要包含控制器参数以及子模块配比两方面因素,然后搭建PSCAD系统仿真模型对其影响结果进行仿真验证并给出故障特性优化方法。结果表明,通过优化控制器参数可有效降低换流阀电气应力并缩短故障电流清除时间;故障期间在负投入子模块个数饱和的情况下,通过提升全桥子模块配比可缩短故障电流清除时间。Hybrid MMC can use the negative voltage capability of the full bridge sub-module to achieve DC fault unlocked ride-through.Since the DC fault ride-through characteristic is an important indicator for evaluating the performance of converter valve equipment and control and protection systems,this paper first analyzes the influencing factors and the mechanism of the hybrid MMC DC fault ride-through characteristics,mainly includes the controller parameters and sub-module ratio.Then,a PSCAD system simulation model is built to simulate and verify its influence results and give the fault characteristic optimization methods.The results show that optimizing the controller parameters can effectively reduce the electrical stress of the converter valve and shorten the fault current clearing time;During the fault period,when the number of negative input sub-modules is saturated,the fault current clearing time can be shortened by increasing the ratio of the full-bridge sub-modules.

关 键 词：直流故障穿越特性 影响因素 控制器参数 子模块配比 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TM722[自动化与计算机技术—计算机科学与技术]