Abstract
The SESS(Stationary Energy Storage System) using a lithium-ion battery has been introduced and operated both in Japan and overseas for the purpose of taking measures for prevention of regeneration cancellation, voltage drop compensation and energy conservation. However, the conventional SESS control could not perform reliable charge and discharge operation if it is installed in a substation connected to a vulnerable power system. In this case, the originally expected energy saving effect cannot be obtained. It is developed a new control method that does not cause unnecessary charging even if SESS is installed in a substation where the power system network is vulnerable. The summary of the control method and the result of the demonstration test are reported below.
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