Optimal Sizing of ESS and Contract Capacity Based on Scheduling of ESS and EVs

Abstract

The installation of the energy storage system(ESS) can mitigate the problems which are caused by the intermittency of renewable energy system(RES) and the massive charging demand of electric vehicles(EVs) However due to the high investment cost of ESS how to choose a reasonable capacity and cooperate with the appropriate contract capacity to operate it in the best interests to reduce the overall cost of the microgrid and stabilize the operation simultaneously is the primary goal of this thesis Therefore we propose a size optimization method for ESS and contract capacity in the microgrid to optimize the investment cost At the same time it considers the centralized optimal schedule for charging/discharging ESS and EVs’ grid-to-vehicle/vehicle-to-grid (G2V/V2G) program so as to optimize the operation cost In this way the microgrid can not only shed the peak load but also satisfy the charging demand for every EV user In the simulation results we consider the different photovoltaic(PV) capacity number of EV chargers and electricity price mechanism to compare the size of ESS contract capacity and overall cost in the microgrid From the simulation results it will bring a positive influence to the microgrid when applies 2-stage time-of-use(TOU) mechanism and installs the ESS The overall cost of microgrid reduces by an average of 22 78%

Date of Award	2020
Original language	English
Supervisor	Hong-Tzer Yang (Supervisor)