基于DSOGI-FLL的MMC-HVDC故障控制策略研究  

Research on Fault Control Strategy in MMC-HVDC Based on DSOGI-FLL

作　　者：袁斌华 薛彪 张钰 

机构地区：[1]陇东学院电气工程学院,甘肃庆阳745000 [2]甘肃省电力科学研究院,甘肃兰州730000

出　　处：《电气传动》2018年第2期47-52,共6页Electric Drive

基　　金：陇东学院青年科技创新项目(XYBY140207);陇东学院青年科技创新项目(XYZK1613)

摘　　要：在MMC-HVDC输电系统的交流侧发生不对称短路故障时,系统的电流和有功功率出现二倍频振荡。采用基于锁频环的双二阶广义积分器(DSOGI-FLL)对换流站的正、负序虚拟磁链进行估算。利用虚拟磁链来计算内环控制器的电流给定值,不仅能够抑制故障时流向换流器的有功功率二倍频振荡,而且能够有效抑制故障过电流。在PSCAD/EMTDC中搭建仿真模型并进行了必要的实验验证,结果表明此策略能有效抑制故障过电流及有功功率的二倍频振荡,提高了系统的运行稳定性。When the AC side of converter in HVDC system occurs unbalanced faults,the double frequency active power oscillations and large overcurrent are occurred. The positive and negative sequence virtual flux components were estimated using the dual second order generalized integrator based on the frequency-locked loop.The setting values of inner current controller were calculated using the virtual flux components. The double frequency active power oscillation and overcurrent could be eliminated. A complete system simulation model and experimental platform were built in PSCAD/EMTDC,the results show that the strategy can effectively restrain the fault overcurrent and double frequency active power oscillation,improve the operation ability of the system.

关 键 词：电压源换流器 正负序虚拟磁链估计 双二阶广义积分器 有功二倍频振荡 锁频环 

分 类 号：TM726[电气工程—电力系统及自动化]