摘要
孤岛模式运行的三相微电网系统带不平衡负载运行时,不平衡负载不仅会导致负序电流的无序分配,而且将引起微电网母线电压的不平衡,进而会降低系统稳定性和可靠性。针对此种情况,提出一种负序电压空间矢量抑制方法。该方法将不平衡电压矢量分解成正序电压矢量和负序电压矢量,通过控制器的作用将负序电压空间矢量抵消成零,再经过电压电流双闭环将正序电压空间矢量补偿到参考值。最后通过仿真与实验验证了此方法可以简单有效地解决微网逆变器带不平衡负载时引起的电压不平衡问题。
In island mode operation of three-phase micro-grid system with unbalanced load operation,unbalanced load leads to the disorderly distribution of negative sequence currents,and cause imbalance in the micro-grid bus voltage, which in turn reduces system stability and reliability.In view of this situation,a negative sequence voltage space vector suppression method is presented.The method decomposes the unbalanced voltage vector into positive sequence voltage vector and negative sequence voltage vector,and then cancels the negative sequence voltage space vector to zero through the controller,and then compensates the positive sequence voltage space vector to the reference value through the double loop of voltage and current.Finally,the simulation and experiment show that this method can solve the voltage unbalance problem caused by the unbalanced load in the micro-grid inverter simply and effectively.
作者
王晓寰
刘婷伟
张纯江
骈帅华
WANG Xiao-huan;LIU Ting-wei;ZHANG Chun-jiang;PIAN Shuai-hua(Key Lab of Power Electronics for Energy Conservation and Motor Drive of Hebei province, Yanshan University,Qinhuangdao 066004,China)
出处
《电力电子技术》
CSCD
北大核心
2019年第2期34-36,共3页
Power Electronics
基金
国家自然科学基金青年基金(51607154)
河北省高校基金(QN2017362)~~
关键词
微电网
孤岛模式
不平衡负载
负序电压矢量
micro-grid
island mode
unbalanced load
negative sequence voltage vector
