Voltage Sag Immunity of Coal Feeder Inverter in Power Plants

doi:10.3969/j.issn.1000-7229.2015.03.015

Abstract

Abstract:

As the large-scale usage of auxiliary system inverter in power plants, large tripping problems of thermal power units caused by voltage sag are more and more obvious. Combining with the field test data of low voltage ride through（LVRT） for coal feeder inverter in thermal power units in Shaanxi Grid, this paper analyzed the effect of main factors of voltage sag on the output characteristics of inverters, and used dynamic voltage restorers （DVR） as a rapid compesation method to solve voltage sag. The sag dephth, duration time, load, sag types and other factors had great influence on the operating featuer of coal feeder inverters in thermal power units, which might lead to the DC working voltage of inverter reducing, even triggering inverter circuit tripping out of service. The voltage sag experiments and compensation stimulation model were established with using PSCAD/EMTDC. The results show that DVR have good ability to steady the DC working voltage and can promote inverter through the serious voltage sag.

Key words: voltage sag, inverter, immunity, dynamic voltage restorer（DVR）

SHAO Wenquan,WANG Long,WANG Jianbo,WU Bo,YANG Yapeng. Voltage Sag Immunity of Coal Feeder Inverter in Power Plants[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(3): 88-93.

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