提升配网不平衡负载供电可靠性的VSC控制  

VSC Control for Improving Reliability of Power Supply With Unbalanced Load in Distribution Network

作　　者：赵子豪 刘洋 安佳坤 侯若松 ZHAO Zi-hao;LIU Yang;AN Jia-kun;HOU Ruo-song(State Grid Hebei Economic Research Institute,Shijiazhuang 050000,China)

机构地区：[1]国网河北省电力有限公司经济技术研究院,河北石家庄050000 [2]武汉大学,电气工程学院,湖北武汉430072

出　　处：《电力电子技术》2024年第6期136-140,共5页Power Electronics

基　　金：国家电网公司总部科技项目(1300-202056133A-0-0-00)。

摘　　要：配电网中存在的不平衡负载易使系统产生负序电流,严重时会影响配电网三相电压对称性,危害设备用电安全,利用电压源换流器(VSC)可对配电网中存在的负序电流进行抑制并提升配网供电可靠性。通过分析VSC输出接不平衡负载时的系统不平衡机理,提出在系统传统控制环路中引入谐振控制器,以抑制不平衡负载条件下控制环路中所存在的2倍工频脉动分量,所提出的控制策略免去常规控制中所需电压、电流正负序分离等控制环节,极大简化了系统控制结构。仿真和实验结果验证了所提出的系统控制策略能有效地抑制由不平衡负载引起的输出电压畸变,获得高质量的输出电压波形。The unbalanced load in the distribution network is easy to make the system produce negative sequence current,which will affect the symmetry of the three-phase voltage in the distribution network and endanger the safety of the equipment,using voltage source converter(VSC),the negative sequence current in distribution network can be restrained and the reliability of distribution network can be improved.By analyzing the unbalance mechanism of VSC when the output of VSC is connected with unbalance load,a resonant controller is introduced into the traditional control loop,in order to suppress the double power frequency pulsation in the control loop under unbalanced load,the proposed control strategy eliminates the separation of positive and negative voltage and current sequence needed in conventional control,greatly simplified the system control structure.Simulation and experimental results verify that the proposed control strategy can effectively suppress the output voltage distortion caused by unbalanced load,and obtain high quality output voltage waveform.

关 键 词：电压源换流器 不平衡负载 谐振控制器 

分 类 号：TM46[电气工程—电器]