News Releases 2018Power conditioner able to deal with instantaneous voltage sag in lithium ion batteries starts operating at Mitsui Norin plant

Meidensha Corporation (Meiden) installed a power conditioner system (PCS) able to deal with instantaneous voltage sag in lithium ion batteries at Mitsui Norin Co., Ltd.’s Sutama plant in Hokuto City, Yamanashi Prefecture, on January 2018, in time for the start of its operation the following month.

This is the second power conditioner system connected to lithium ion batteries that Meiden - the top maker of high-capacity PCSs capable of dealing with instantaneous voltage sag, in terms of units shipped – has sold, following one installed at the research arm of a domestic manufacturer.

The latest order was made through Japan Facility Solutions, Inc., a wholly owned subsidiary of TEPCO Energy Partner, Inc. The PCS’s capacity is 2,400kVA, and the lithium ion batteries connected to the system were made by Murata Manufacturing Co., Ltd.

Meiden’s PCS was adopted because it is capable of dealing with instantaneous voltage sag and equipped with a system to handle demand response. Instantaneous voltage sag is caused by lightning strikes and other incidents, and can stall production lines, negatively affect product quality and result in additional expenses. Meiden’s PCS is capable of supplying a certain level of voltage even during a sudden voltage drop, thereby protecting the production lines.

Demand response is a measure to ensure the stable supply of electricity during tight demand-supply conditions. Under this system, electricity recipients save energy in line with a request made by an electric power firm, or an equivalent, to conserve energy during peak use hours. Electricity recipients receive remuneration commensurate with the amount of power they conserved. The PCS allows the user to save energy by storing electricity in batteries during nighttime and discharge the electricity during daytime peak hours.

Meiden has installed PCSs for storage batteries in more than 100 locations since it started selling such systems in 1996. These systems have a total capacity of 200MVA. Meiden aims to sell these products and install them at 10 locations a year to cater to clients that want to be prepared for instantaneous voltage sag at production lines and take advantage of the expected proliferation of virtual power plants (VPP)※1.

Merits of power conditioning system capable of coping with instantaneous voltage sag

1. The product’s peak shifting function allows the leveling off of electrical usage through the day by storing electricity in batteries during nighttime and discharging it during the day. This will result in cheaper electricity bills. (See chart of a sample case on the right.)
2. When the power supply from an electric power company is cut off, the PCS can automatically command the storage batteries to discharge electricity. (Autonomous operation; can accommodate business continuity plan.)
3. Equipped with supplementary function to deal with instantaneous voltage sag.
4. It can ensure stable operation of emergency power generators.


※1 A virtual power plant aggregates the capacities of facilities in dispersed locations as if it were one power plant. Even if the power generation and power storage volumes of individual facilities are small, a VPP can adjust the demand-supply balance of electricity like a large-scale power plant, by controlling the small plants as one. 

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