Mehdi Asadi - Faculty of Engineering, Clean power generation and electrochemical laboratory, Amol University of Special Modern Technologies, Amol, Iran
hadi behkar - Faculty of Engineering, Clean power generation and electrochemical laboratory, Amol University of Special Modern Technologies, Amol, Iran
hadi gavzan galogah - Faculty of Engineering, Clean power generation and electrochemical laboratory, Amol University of Special Modern Technologies, Amol, Iran
Saeid Moosavi - Faculty of Engineering, Clean power generation and electrochemical laboratory, Amol University of Special Modern Technologies, Amol, Iran

Today, one of the issues in Iran s electrical power system, especially noticeable by the planners and operators of the system, is the high variation and unevenness of the load curve in different hours of the day. Energy storage systems are a solution to this challenge through load curve alignment, help in controlling frequency, reducing voltage fluctuations, increasing the power quality and reliability. The pumped storage power plant is important because of the ability to store energy and as a contributing factor between production and consumption. These systems reduce the cost of operating and generating energy in the base load power plants by requiring energy at low load times and generating energy at peak load times, as well as the need to install peak load power stations. In this paper, considering the technology as the only large-scale energy storage technology, advanced designs, and cycles in this area will be introduced and deeply discussed.

Energy storage, Load curve, Frequency control, Pumped storage power plant