Grid Peak Load Shaving Method Considering EV Charging Uncertainty Based on Interval Optimization

Abstract

With the rapid development of electric vehicles, more and more electric vehicles are entering people’s lives. However, the large-scale access of electric vehicles to the grid brings harm to the stability of grid operation, and the problem of how to guide the staggered charging of electric vehicles needs to be solved. In this paper, we consider the travel characteristics and charging characteristics of three different types of EVs: private cars, buses, and cabs, and set up a time-of-use tariff to guide EV users to charge reasonably, thus reducing the impact of charging load on the grid by cutting peaks and filling valleys. Since the charging load of EVs is an interval value, this paper introduces interval optimization theory, establishes an optimistic model and a pessimistic model, calculates the upper and lower bound of the interval respectively, and finds out the interval value of grid load after peak and valley reduction.