MODELLING AND ENERGY MANAGEMENT OPTIMISATION OF BATTERY ENERGY STORAGE SYSTEM (BESS) BASED PHOTOVOLTAIC CHARGING STATION (PV-CS) FOR UNIVERSITY CAMPUS

摘要

As utilization of Photovoltaic Charging Stations (PV-CS) that generate clean electricity from the sun increase, Dublin Institute of Technology (DIT) adopts this application for accommodating the required charge of small campus Battery Electric Vehicles (BEVs). This paper presents the virtual simulation of the 10.5 kW Battery Energy Storage System (BESS) based PV-CS model. Transient System Simulation (TRNSYS) built-in climatic data and modular structure properties were adopted to replicate the experimentally proposed PV-CS, where special attention was paid to the electrical measurments and energy flow signals. The objective was set to model the PV-CS system, formulate an energy managment optimisation and justify the ideal value and or potential range of the equivalent battery size. The primary assessment for energy management of the charging infrastructure was performed through the formulation of analytical energy balancing optimization. The energy balancing approach adopted the Simple Payback Period (SPP) method in order to investigate the acquired positive gains (Gain-1 and Gain-2) by BESS unit. The key variables for tuning the BESS capacity were load profile and size of BESS. The resultant measurement signals from TRNSYS were monitored and compared to their analytical equivalents, where verification and conclusion on accuracy improvements for BESS capacity and reliable system performance were drawn.