基于模拟器的光伏逆变器低电压穿越检测技术

摘要

低电压穿越(LVRT)能力作为光伏并网逆变器的一项重要能力,关系到整个电网系统的稳定.为检测LVRT能力,设计一种基于电网模拟器的光伏并网逆变器LVRT检测平台.研究了检测平台测试数据的分析计算方法,如基波正序有功电流、无功电流.介绍了德国中压并网标准的LVRT要求,依据此标准在检测平台上测试了某型光伏并网逆变器的LVRT能力,结果表明该检测平台能很好地完成此项检验.%Low voltage ride through(LVRT) capacity is an important capacity for photovoltaic grid-connected inverter,it is related to the stability of the grid system.In order to test the LVRT capacity,a LVRT testing platform using grid simulator is designed for photovoltaic grid-connected inverter.The analysis and calculation method for the testing data of testing platform is studied,such as the active and reactive currents of fundamental positive sequence.The LVRT requirements of German's medium voltage grid-connected standards is introduced,and a model photovoltaic gridconnected inverter's LVRT capacity has been tested by the testing platform.The results show that the test platform can greatly finish the inspection.