Abstract
A prospect of increasing penetration of uncoordinated electric vehicles (EVs) together with intermittent renewable energy generation in microgrid systems has motivated us to explore an effective strategy for safe and economic operation of such distributed generation systems. This paper presents a robust economic dispatch strategy for grid-connected microgrids. Uncertainty from wind power and EV charging loads is modeled as an uncertain set of interval predictions. Considering the worst case scenario, the proposed strategy can help to regulate the EV charging behaviors, and distributed generation in order to reduce operation cost under practical constraints. To address the issue of over-conservatism of robust optimization, a dispatch interval coefficient is introduced to adjust the level of robustness with probabilistic bounds on constraints, which gradually improves the system's economic efficiency. In addition, in order to facilitate the decision-making strategies from an economic perspective, this paper explores the relationship between the volatility of uncertain parameters and the economy based on the theory of interval forecast. Numerical case studies demonstrate the feasibility and robustness of the proposed dispatch strategy.
Highlights
Due to their environmental friendliness, electric vehicles (EVs) have drawn great attention during recent decades in terms of power demand [1,2]
This paper proposes an adjustable robust optimization (RO) model to solve the multi-dispatch problem for a residential microgrid, which is integrated with diesel engine (DE), micro turbine (MT), wind turbine (WT) and a large number of EVs
As shown in Reference [26], the arrival time of EVs in a residential area occurs during 17:30–22:30, which can be divided into ten periods, EVs arriving in each period is defined as one group
Summary
Due to their environmental friendliness, electric vehicles (EVs) have drawn great attention during recent decades in terms of power demand [1,2]. Mena et al [15] proposed a multi-objective optimization framework including renewable power supply and energy storage system in order to solve the uncertainties caused by the wind, sun light and EVs, in which EVs have three states of charge, discharge and unconnected, and obtained the optimal distributed generation integrated network considering multiple sources of uncertain variables using NSGA-II. Have built up multi-objective optimization models for microgrid with DGs and loads, which provide an efficient integration of renewable energy and EVs, with simultaneous consideration of minimum fuel costs, operation and maintenance (OM) costs and operation emissions.
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