MANAGEMENT SYSTEM, MANAGEMENT METHOD, POWER CONVERSION APPARATUS, AND MANAGEMENT APPARATUS

A management system includes a management apparatus; and a power conversion apparatus configured to convert, at least one of output power from a distributed power source and input power into the distributed power source, into AC power or DC power. The management apparatus includes: a receiver configured to receive a power control message controlling the power conversion apparatus, from an external server of a business operator that manages a power system to which the distributed power source is connected; and a transmitter configured to transmit the power control message to the power conversion apparatus, and the power conversion apparatus is configured to operate without following the power control message in a predetermined state.