Hitachi Ltd announced March 28, 2014, that its power storage system has been employed for a field test targeted at the US market for frequency adjustment and capacity.
Hitachi America Ltd, which is Hitachi's regional headquarters, and Demansys Energy LLC (Connecticut, the US), which provides services of controlling the demand of utility customers, agreed to carry out the test using Hitachi's power storage system.
The employed power storage system is the "CrystEna," a compact container-type system, which has started to be installed. The goal of the field test is to confirm the effectiveness of the system in stabilizing a power grid. The test will be carried out for two years beginning from June 2014.
In the US, the ratio of grid electricity produced from renewable energy sources such as wind and solar power is increasing because a large number of renewable energy-based power generation facilities are being introduced. But the output fluctuation of those facilities may make it difficult to maintain frequency. As a result, power storage systems that help operate grid systems properly are drawing attention.
In addition, there are many regions where power generation, power transmission and power grid operation facilities are separated from one another in the US. Therefore, for independent system operators (ISOs), there have already been services of adjusting frequency as well as services that provide backup power supply capacities to be used in a time of emergency or in the future. And power storage systems are under consideration as one of the new technologies targeted at the expanding market for frequency adjustment and capacity.
The CrystEna is one of the core products of Hitachi's energy storage systems and consists of the company's control system and PV inverter, Hitachi Chemical Co Ltd's lithium-ion (Li-ion) rechargeable battery, etc. Hitachi Chemical is affiliated with Hitachi. The CrystEna has a high economic efficiency because of its compact design and improved system performance including a control technology to extend the product life of the rechargeable battery.
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