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

Claim 17:
18. A method of discharging power stored in an energy storage unit to output to a grid in a power system comprising a power inverter coupled to a power source through a DC bus, and an energy storage power converter coupled between the DC bus and the energy storage unit, the method comprising:
discharging power from the energy storage unit to the power inverter to supplement power output by the power source such that the power inverter can supply the power to the grid,
wherein, the power from the energy storage unit is discharged by adjusting a power discharge command of the energy storage unit by a predetermined power discharge change value according to a change in an output power of the power source in a closed loop having the adjusted power discharge command as an input to the closed loop,
wherein when discharging power from the energy storage unit, power available from the power source is given priority over power available from the energy storage unit,
wherein discharging power from the energy storage unit to the power inverter such that the power inverter can supply the power to the grid comprises:
determining whether an output power of the power source has decreased, and adjusting a power being discharged from the energy storage unit according to whether the output power of the power source has decreased;

determining whether the power inverter is not curtailed;
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.