Voltage Adjustment Strategy for High-Penetration Electric Vehicles Connected to Power Grid Based on Situation Awareness

doi:10.11930/j.issn.1004-9649.202204108

Abstract

Abstract: Along with the increase of EVs use, the regional distribution network will experience nodal voltage overlimit problem after high penetration EVs are connected to the distribution network. Based on situation awareness technology, this paper proposes a voltage adjustment strategy with the joint participation of reactive power compensation equipment and EVs in the regional distribution network to ensure the voltage status of the distribution network through constructing a secondary voltage regulation mode. In the situation perception stage, the information on the EV status, grid operation status and EV charging station status is collected; in the situation assessment stage, the information collected in the situation perception stage is used to establish an objective function with minimum comprehensive cost after high penetration EVs are connected to the grid; in the situation prediction stage, the voltage deviation of the distribution network is predicted according to the charging demand of EVs and the information of EV charging stations, and a global electrical distance matrix is established to correct the predicted voltage based on the power flow section and to confirm the voltage deviation of the grid; in the facilitation stage, the distribution network voltage deviation index is introduced to determine the degree of distribution network’s voltage deviation with consideration of the voltage regulation mode within the distribution network, and the secondary voltage regulation control strategy of the distribution network is determined for different degrees of voltage deviation. A simulation analysis is carried out with IEEE 30-node system, and the results have verified that the proposed method can effectively solve the grid voltage overlimit problem after high penetration of EVs are connected to the grid.

Key words: electric vehicle, situational awareness, secondary regulation, voltage overlimit, charging station

LIU Zong, HE Jun, HUANG Wentao, ZHU Liwen, DENG Changhong. Voltage Adjustment Strategy for High-Penetration Electric Vehicles Connected to Power Grid Based on Situation Awareness[J]. Electric Power, 2023, 56(2): 32-44.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202204108

https://www.electricpower.com.cn/EN/Y2023/V56/I2/32

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