Power conversion system for power system interconnection

A power conversion system for system interconnection, which includes a power conversion device connected to a power system via an interconnection switch, wherein in parallel with the interconnection switch, a series circuit is connected which is composed of a voltage maintenance load for maintaining necessary voltage for a user load at a time of momentary power interruption of the power system, and a load disconnection switch for disconnecting from the voltage maintenance load, the power conversion system comprising:

• a power information detector including sensors that detect power information including at least one of system power information about the power system, load power information about load power supplied to the user load, and flow power information about flow power between the user load and the interconnection switch;
• processing circuitry configured to generate an output command for controlling output current of the power conversion device, based on the power information from the power information detector;
• the processing circuitry is further configured to control the power conversion device based on the output command;
• and the processing circuitry is further configured to generate a driving signal for respectively operating the interconnection switch and the load disconnection switch, based on the power information from the power information detector.

A method of operating a power conversion system for system interconnection, the power conversion system including a power conversion device connected to a power system via an interconnection switch, wherein in parallel with the interconnection switch, a series circuit is connected which is composed of a voltage maintenance load for maintaining necessary voltage for a user load at a time of momentary power interruption of the power system, and a load disconnection switch for disconnecting from the voltage maintenance load, the method comprising:

• detecting power information including at least one of system power information about the power system, load power information about load power supplied to the user load, and flow power information about flow power between the user load and the interconnection switch;
• generating an output command for controlling output current of the power conversion device, based on the power information from the detecting;
• controlling the power conversion device based on the output command;
• and generating a driving signal for respectively operating the interconnection switch and the load disconnection switch, based on the power information from the detecting.