光伏逆变器中并联SiC器件电流失衡的监测技术研究  

Monitoring Technique Research of Current Mismatch in Parallel SiC Devices for Photovoltaic Inverters

作　　者：宋玮琼 郭帅 韩柳 徐超群 宋威 吕凤鸣 SONG Weiqiong;GUO Shuai;HAN Liu;XU Chaoqun;SONG Wei;LÜFengming(Electric Power Institution of State Grid Beijing Power Company,Beijing 100000,China;School of Electrical Engineering,Southeast University,Nanjing 210000,Jiangsu,China)

机构地区：[1]国网北京市电力公司电力科学研究院,北京100000 [2]东南大学电气工程学院,江苏南京210000

出　　处：《电气传动》2024年第7期16-21,共6页Electric Drive

基　　金：国网公司科技项目(5700-202255222A-1-1-ZN)。

摘　　要：为了监测光伏逆变器中并联SiC器件的电流分布状态,提出一种基于各向异性磁阻传感器的非接触式监测方案。根据SiC器件在PCB板上的实际位置,利用多物理场仿真工具COMSOL进行SiC器件周围磁场分布情况分析,并找出磁阻传感器的最佳放置位置。构建包括磁阻传感器、信号调理电路和数据通信接口在内的电流监测单元。基于一台功率为1.5 kW的光伏逆变器实验样机进行测试。实验结果表明,该非接触式电流失衡监测方案具有频带宽、灵敏度高、线性度好及电路结构较为简单的特点。In order to monitor current distribution state of parallel silicon carbide(SiC)devices in photovoltaic inverter,a contactless monitoring solution based on anisotropic magnetoresistive sensor was proposed.According to practical position of SiC devices on PCB board,multiphysics simulation tool COMSOL was employed to analyze magnetic distribution around SiC devices.Then,the best location of magnetoresistive sensor was determined.Current monitoring unit consisting of magnetoresistive sensor,signal conditioning circuit and data communication interface was formed.Testing of a 1.5 kW photovoltaic inverter prototype was implemented.The experimental results demonstrate the contactless current mismatch monitoring solution features high bandwidth,high sensitivity,good linearity and simple circuit structure.

关 键 词：光伏 电流失衡监测 并联SiC 磁传感器 非接触式 

分 类 号：TM464[电气工程—电器]