Integration parameters optimization of low‐voltage multi‐terminal DC system under access of electric vehicles

Abstract

Abstract By integrating the increasing number of electric vehicles (EVs) in the existing multi‐terminal DC system, the new power lines construct can be reduced and the investment in distribution power equipment can be saved. The integration of EVs will affect the power transfer boundary of the system to a certain extent. It is necessary to ensure the normal performance of the system and the power supply for the EVs through the optimal configuration of system integration. The paper proposes the state‐space model of the low‐voltage multi‐terminal DC system, after which the influence of EV integration on the system power transfer boundary and the sensitivity of the power transfer boundary under the change of integration parameters are analysed. Furthermore, an optimization method of EV integration configuration considering the investment cost is proposed, which considers minimizing the system integration cost as the optimization goal and adopts the genetic algorithm for optimization solving. Finally, through the case verification and simulation analysis, the effectiveness of the method is verified, which can minimize the system integration cost and ensure power supply for EVs, without affecting the system power transfer boundary.

Keywords

• genetic algorithms
• power cables
• electric vehicles
• power apparatus
• distributed power generation
• investment