Abstract
Hybrid energy storage systems (HESS) are an effective way to improve the output stability for a large-scale photovoltaic (PV) power generation systems. This paper presents a sizing method for HESS-equipped large-scale centralized PV power stations. The method consists of two parts: determining the power capacity by a statistical method considering the effects of multiple weather conditions and calculating the optimal energy capacity by employing a mathematical model. The method fully considers the characteristics of PV output and multiple kinds of energy storage combinations. Additionally, a pre-storage strategy that can further improve stability of output is proposed. All of the above methods were verified through a case study application to an 850 MW centralized PV power station in the upstream of the Yellow river. The optimal hybrid energy storage combination and its optimization results were obtained by this method. The results show that the optimal capacity configuration can significantly improve the stability of PV output and the pre-storage strategy can further improve the target output satisfaction rate by 8.28%.
Highlights
To improve the energy supply and reduce carbon emission, accelerating the development and utilization of renewable energy has become the focus of energy development [1]
This paper proposed a methodology for determining the capacity of Hybrid energy storage systems (HESS) equipped for large-scale PV power stations that can aid in the planning of energy storage for PV power stations
A statistical method for determining the power capacity was proposed in which the PV output characteristics and the weather factor were considered
Summary
To improve the energy supply and reduce carbon emission, accelerating the development and utilization of renewable energy has become the focus of energy development [1]. Solar energy has been one of the fastest growing energy sources among renewable energy sources [2,3]. Power output fluctuations of large-scale PV power stations result into a decline in power quality. Power output fluctuations may pose a threat to the grid security for large penetration of PV in power systems. To mitigate the above issues, operation limits for grid-connected PV/wind plants were implemented. Output fluctuations per minute should be limited to 10% of the rated power of the plant in China [5]. In Puerto Rico and Mexico, the corresponding value were 10% and 1–5% of the rated power [6,7]
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