Power System Interconnection System and Method of Installing Power System Interconnection System

An object is to provide a power system interconnection system and a method of installing the power system interconnection system that are able to supply a load with required power. A power system interconnection system comprises a storage battery an AC-DC power conversion device for the storage battery a charge and discharge station for an electric-powered automobile and an interconnection control device that are installed on a parking lot. The interconnection control device supplies a first load with power from at least one of the charge and discharge station and the AC-DC. power conversion device in a case where the electric power system is in an emergency situation.