Determination of installed capacity of pumped storage station in WSP hybrid power supply system

The main power resource of the isolated or regional grid in islands or remote areas probably depends on wind and/or solar power. For that, it is quite necessary for a certain capacity of pumped storage station (PSS) to improve the operation safety, stability and economical efficiency of the grid. Taking an isolated island grid as the case, with the known predictive grid load curve and output curve of the wind and solar power, simulation and analysis were made on the operation states of several different capacity of PSS in this paper. And then, the determination method of the optimal installation capacity of PSS was developed. Finally, the technical and economic benefits of PSS for the isolated grid were approved. According to the results, the reasonable supplement of a certain installation capacity of PSS to an isolated grid dominated by wind and solar power, constructed a wind-solar-pumped storage (WSP) hybrid system, can efficiently make up the technical defects of the wind and solar power system and reach the great technical and economic benefits.