Patent ID: 11936187
Assignee: DYNAPOWER COMPANY LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC G  H

Claim 0:
1. A power system for connecting a power source, an energy storage unit and a grid, the power system comprising:
a power inverter electrically coupled to the power source through a DC bus, wherein the power inverter converts DC power from the DC bus to AC power output to the grid;
an energy storage power converter electrically coupled between the DC bus and the energy storage unit, wherein the energy storage power converter stores power in the energy storage unit and discharges power from the energy storage unit; and
a controller for controlling the energy storage power converter, the controller being configured to:
control the energy storage power converter to store excess power from the power source that cannot be output to the grid in the energy storage unit;
control the energy storage power converter to discharge power stored in the energy storage unit to the power inverter to output to the grid;
determine if a current output power of the power source is less than a previous output power of the power source;
determine whether the power inverter is not curtailed;
if the current output power of the power source is less than the previous output power of the power source, adjust a high voltage limit on the DC bus to a value which adds a measured voltage on the DC bus; and
when the power inverter is not curtailed, control the energy storage power converter to adjust a discharge power command for commanding the energy storage power converter to discharge an amount of power from the energy storage unit according to whether the output power of the power source has decreased, wherein the controller is configured to iteratively adjust the discharge power command by a predetermined power discharge adjustment value whose sign is reversed from positive to negative or from negative to positive according to whether the output power of the power source has decreased.