Implementation of Demonstration to Prove the Feasibility of V2G Aggregators

~17 EV/PHEV used to implement Japan's largest EV power station experiment to demonstrate power grid stability~

Tokyo, March 01, 2019
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Tokyo, February 26, 2019 - As announced on June 6, 2018, Tokyo Electric Power Company Holdings, Inc., TEPCO Energy Partner, Inc., TEPCO Power Grid, Inc., Hitachi Systems Power Services, LTD., Mitsubishi Motors Corporation, Shizuoka Gas Co., Ltd. and Hitachi Solutions, Ltd. have been engaged in joint experiments to demonstrate the construction of a virtual power plant*1. Today, the seven companies*2 reported the results of their V2G (Vehicle to Grid) demonstration experiment to the Ministry of Economy, Trade and Industry.
During this demonstration, the largest experiment environment that enables a two-way power exchange between electric vehicles (hereinafter referred to as, "EV/PHEV") and a power grid ever built in Japan was constructed at the East Shizuoka Prefecture Branch and Yoshiwara Station of Shizuoka Gas Co., Ltd., and the Okazaki Plant of Mitsubishi Motors Corporation, and the demonstration confirmed that this technology will be effective in contributing to power grid stability.
In detail, it was confirmed that congestion can be managed (current control) by the output control of EV/PHEV power stations (hereinafter referred to as, "EVPS") according to control commands.
In fact, since EVPS can be controlled and tracked on a second-by-second basis, we believe that output control can be realized in a matter of seconds in the near future even in remote areas through combination with high-speed communications networks.
It was also confirmed that voltage control (reactive power control) can give output responses as signaled by control commands in the same manner as grid congestion management (current control).
By leveraging EV/PHEV to improve power grid stability technology we can further promote the spread of naturally fluctuating power sources, such as solar energy, etc., and contribute to the flexible operation of power grids.
All seven companies will continue their research on V2G-related technology and strive to create a business model aimed at the practical application of V2G aggregators.
<Overview of constructed demonstration environment>
Shizuoka Gas Co., Ltd. East Shizuoka Prefecture Branch and Yoshiwara Station
Mitsubishi Motors Corporation, Okazaki Plant
# of EV/PHEV
17(EV:5, PHEV:12)
Vehicle Use
# of EVPS
<Overview of demonstration>
Use Case
Congestion Mitigation
Voltage Control
Control Type
Current Control
Reactive Power Control
Control Objective
To absorb reverse power from DER to manage the capacity of distribution network.
To avoid voltage fluctuation caused by reverse power flow from DER in distribution network using reactive power control.
Primary achievements
  • In either use case, response and trackability of EVPS and EV/PHEV to control commands confirmed.
  • EVPS was able to controlled and tracked on a second-by-second basis.
*1: Virtual Power Plant (VPP):
A virtual power station that uses telecommunications technology to integrate control of distributed energy sources and function as one power facility.
*2: Seven companies:
Aggregation coordinator: One company
– Tokyo Electric Power Company Holdings, Inc. (Headquarters: Chiyoda-ku, Tokyo; President: Tomoaki Kobayakawa)

Joint demonstration project: Four companies
– TEPCO Energy Partner, Inc. (Headquarters: Chiyoda-ku, Tokyo; President: Toshihiro Kawasaki)
– TEPCO Power Grid, Inc. (Headquarters: Chiyoda-ku, Tokyo; President: Yoshinori Kaneko)
– Mitsubishi Motors Corporation (Headquarters: Minato-ku, Tokyo; Chairman of the Board/CEO: Osamu Masuko)
– Hitachi Systems Power Services, Ltd. (Headquarters: Minato-ku, Tokyo; President/CEO: Akira Sakai)

Resource aggregator: Two companies
– Shizuoka Gas Co., Ltd. (Headquarters: Shizuoka City, Shizuoka; Representative Director: Hiroyuki Kishida)
– Hitachi Solutions, Ltd. (Headquarters: Shinagawa-ku, Tokyo; President/CEO: Tatsuro Hoshino)