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ORIGINAL RESEARCH article

Front. Energy Res.
Sec. Smart Grids
Volume 12 - 2024 | doi: 10.3389/fenrg.2024.1396969

A New Grid Side Inertia Support Control Method for Cascaded Power Converters in Bi-directional EV Chargers

Provisionally accepted
Yan Tian Yan Tian *Bo Huang Bo Huang Jian Fang Jian Fang Wei Chen Wei Chen Yu Xin Yu Xin Haobo Lin Haobo Lin Xiang Lin Xiang Lin
  • Guangzhou Power Supply Bureau, Guangdong Power Grid Co., LTD., Guangdong, China

The final, formatted version of the article will be published soon.

    To provide inertia support to the power grid, the grid side frontend DC/AC inverter of the bidirectional electric vehicle (EV) charging facilities can use the virtual synchronous generator (VSG) control in its grid-side DC/AC converter. However, the existing VSG control cannot actually realize the inertia support due to the limitations of the existing cascaded power converters control structure of the bidirectional EV charger. This paper proposes a new control infrastructure for VSG based bi-directional EV charging facilities. The proposed control instantaneously tracks the inertial supporting surge power by DC/DC so as to stabilize the DC bus voltage. Meanwhile, the droop coefficient based power values are also fed forward to DC/DC controls to support grid frequency control over a larger time scale. Finally, the experiment results show that the proposed method improves the DC bus voltage stability of the EV charger while allowing the EV to participate in the power system frequency regulation, which is a key feature of the Vehicle to Grid applications.

    Keywords: bi-directional EV charger, virtual synchronous generator, grid-side inertia support, cascaded power converters, Power Control

    Received: 06 Mar 2024; Accepted: 08 Aug 2024.

    Copyright: © 2024 Tian, Huang, Fang, Chen, Xin, Lin and Lin. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Yan Tian, Guangzhou Power Supply Bureau, Guangdong Power Grid Co., LTD., Guangdong, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.