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In this paper, the optimal allocation problem of the Electric Vehicles Parking Lots and DG in micro-grid is studied as a novel optimization problem. In the proposed problem, the different factors including the technical and the economic issues are considered for achieving a realistic solution. In addition, FACTS devices have been added to the network by considering the costs of installation, repair and maintenance, and their effecton the technical and economic parameters of the network has been investigated. Also, how to optimally charge and discharge storage devices and how to optimally inject active or reactive power by charging stations to improve energy management in the network has been studied. In order to evaluate the impact and reduce economic costs, the optimal number of distributed renewable energy, storage and FACTS equipment along with the optimal number of parking lots with Existence of different number of electric vehicles in the survey and microgrid network has been designed using a two-stage optimization method. The method is simulated on the standard IEEE 33 bus. The results show that the optimal power factor of parking lots can be determined during the unloading of vehicles in such a way that the technical parameter of the network is improved.

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Abstract:The requirements for the power inverter of the electric vehicles (EVs) include high peak power, low output harmonics, inexpensive circuit and low continuous power rating. The purpose of this paper is to reduce the output harmonics of a cascade H-bridge multilevel inverter for EV applications by means of a bacterial foraging algorithm (BFA). In this study, the modified BFA is proposed as a technique for solving non-linear equations of selective harmonics elimination technique for determining optimal switching angles in multilevel inverters. The proposed optimisation method enhances the convergence rate and accuracy in dealing with complex problems with high dimensions, by adding improved and dynamic aspects to its main algorithm. Also, in this paper, a lower number of DC voltage sources have been used in the provided inverter compared with common multilevel inverters; this has resulted in the reduction in price of the inverter. Simulation results on various conditions were carried out using PSCAD/EMTDC software.Keywords: cascaded H-bridge multilevel inverter; power quality; modulation method; switching angles; harmonics; BFA; bacterial foraging algorithm.Reference to this paper should be made as follows: Farsadi, M. and Ahmadi, M. (2016) 'Improving power quality with reducing output harmonics for electric vehicle applications by using bacteria foraging algorithm', Int.