SIZING OPTIMIZATION OF A PHOTOVOLTAIC/BATTERY SYSTEM BASED ON ANALYSIS OF THE ANNUAL TOTAL SOLAR RADIATION IN THE NORTH OF VIETNAM

Abstract

This paper proposed a novel method for optimal capacity designing of photovoltaic (PV) system combined with battery supplying to 2 types of load pattern in the North of Vietnam. The optimization problem is to minimize the levelized cost of energy (LCE) and satisfy the required grid dependency (GD). Generally, GD was estimated based on the time series of weather data. In this research, we developed an empirical formula of the GD. The GD was simulated using the meteorological data over the past 15 years in 7 locations in the North of Vietnam. From the results, the GD could be estimated based on the annual total solar radiation, the capacity of PV and battery without consideration of the time series of the weather data. After obtaining the empirical formula, the optimal configuration of the PV/battery system was calculated. The developed formula can lead to the simplicity in process of sizing optimization. Additionally, the sensitivity analysis was also conducted to investigate the results when the price of PV and battery changes. The results show that the proposed method is highly accurate and can be applied to any location in the North, especially with incomplete weather data.