Power control system including power supply DC line and selected one of plural performing DC voltage feedback control

A power control system connected to a power supply DC line to which a plurality of power converters and a load are connected, each of the plurality of power converters being connected to a respective power source of a plurality of power supply sources, the power control system comprising:

• a capacitor electrically connected to the power supply DC line;
• a capacitor sensor, provided in the current path between the capacitor and the power supply DC line, which detects the charge and discharge values of the capacitor;
• and
• a control unit comprising a processor that executes computer executable instructions to control the plurality of power converters and performs DC voltage feedback control to bring the voltage of the power supply DC line closer to a target voltage for only one specific power converter of the plurality of power converters,
• wherein
• the control unit provides the specific power converter with a current command that is the sum of a first current command based on DC voltage feedback control and a second current command based on feedforward control using a predicted excessive/deficient power consumption of the load relative to the power supplied from the plurality of power supply sources,
• the plurality of power converters includes at least a first power converter connected to a renewable energy utilization power generation device serving as the respective power supply source thereof and at least a second power converter connected to an energy storage medium serving as the respective power supply source thereof, and
• the predicted excessive/deficient power consumption of the load is further based on a scheduled value of power to be charged/discharged by the capacitor required to maintain a predetermined potential difference with the load.