一种用于MPPT的温差发电片短路电流估计法  

Research on control strategy of hybrid energy storage in islanded AC micro-grid based on virtual impedance

作　　者：陈亮 王军 阎铁生 孙章 Chen Liang;Wang Jun;Yan Tiesheng;Sun Zhang(School of Electrical Engineering and Electronic Information,Xihua University,Chengdu 610039,China)

机构地区：[1]西华大学电气与电子信息学院

出　　处：《电测与仪表》2019年第14期148-152,共5页Electrical Measurement & Instrumentation

基　　金：成都市科技局国际合作项目(2016-GH02-00111-HZ);四川省科技厅四川省重点研发资助项目(61472328)

摘　　要：针对温差发电器(Thermoelectric Generator,TEG)短路电流法最大功率点跟踪(Maximum Power Point Tracking,MPPT)策略的短路电流不能直接测量的问题,提出了温差片短路电流估计法。通过深入分析温差片等效模型及Boost主电路工作模态,推导出根据电感电流上升段的电流值及其斜率计算温差片短路电流的方法。所提方法硬件结构简单,且对主电路正常工作无影响。通过仿真以及搭建实验样机验证理论分析的正确性,验证结果表明提出的短路电流估算方法准确率达99.83%。In order to overcome the defects of inconvenient sampling of current sampling for thermoelectric generator maximum power point tracking (MPPT), the short-circuit current estimation method of thermoelectric generator is proposed in this paper. The method of calculating the short-circuit current of TEG which is based on the value and the slope of inductor current during on-time of Boost converter is deduced through the analysis of the equivalent circuit of thermoelectric generator (TEG) and the operation mode of Boost converter. The proposed method has the advantages of no influence on the normal work of the main circuit and the simple structure of the hardware. The simulation and the verification result of experimental prototype show that the proposed method is effective and the accuracy of short circuit current estimation is about 99.83%.

关 键 词：温差发电 最大功率点跟踪 短路电流 电感电流 

分 类 号：TM933[电气工程—电力电子与电力传动]