光伏并网逆变器低电压穿越检测方案分析

摘要

By analyzing and comparative test for LVRT test schemes based on passive-impedance network and the grid simulator, this paper deals with the diversity in terms of the main circuit topology, voltage dip range and accuracy, instantaneous overload ability and control stability etc. The analysis and testing results show that LVRT testing scheme based on the passive-impedance network can be very closer to the actual operation condition with stable output voltage waveforms.%通过对基于阻抗分压式和电网模拟式两种光伏并网逆变器低电压穿越LVRT检测方案分析及试验比对，阐明了两者在主电路拓扑、电压跌落幅值范围、准确性、瞬时过载能力和控制稳定性等方面的差异性。分析与试验结果表明，基于阻抗分压式的光伏并网逆变器LVRT检测方案能够真实地满足LVRT测试要求，并且输出电压波形稳定，更接近实际工况。