Review of PV power ramp rate control methods and their requirements

Abstract

Grid codes play significant ro le in elaborating power system characteristics, such as limiting ramp rate of different kinds of power plants. Using new generation of energy sources, like solar energy develops the necessity for controlling the characteristics of these sources such as their power ramp rates. While solar power is going to increase or decrease, ramp rate control must be applied. There have been suggested different strategies for power ramp rate control. So me of these strategies need batteries and some do not. Due to solar radiation uncertainties, using energy storage systems for controlling power ramp rate looks inevitable . On the other hand, batteries add huge costs and unreliability to the power systems. As a result, there is a tradeoff among initial cost, reliability, security, and operation costs for selecting optimal strategy for photovoltaic power ramp rate control in a system. A lso the acceptable error marg in of grid is a decisive factor. In this paper schemes of some power ramp rate control are discussed. In addition, advantages and disadvantages of different types of schemes have been analyzed. Also, in this literature different types of power ramp rate control strategies for photovoltaics have been clustered into some major sets. Besides, power ramp rate control is essential for novel schemes such as virtual synchronous machine, so emerg ing virtual inert ia in novel power grids is another motivation to establish imp roved methods for controlling power ramp rate control of renewable energy sources. Thus, in this paper there is a section discussing about the applications of power ramp rate control schemes.