Static frequency converters modelling improvement and harmonic analysis for pumped storage power plants

Abstract

Pumped storage power station is a device that converts surplus electrical energy into potential energy at low power load valley, mainly by pumping water from the lower reservoir to the upper reservoir through a large turbine unit, and converting potential energy into electrical energy at peak power load; in the study of the unit harmonic problem is the most important is to analyse the static inverter SFC dragging process, but the difficulty of its unit modelling is very great, so an equivalent replacement method is proposed not only to simulate not only the transient process of harmonic generation and transmission when the turbine unit is switched, but also the steady-state process in its stable phase. After a comparative analysis of the principles, this improved modelling was also verified by simulation to be an equivalent replacement.