Method and apparatus for controlling a phase angle of ac power to keep dc voltage from an energy source constant
AssigneeAmerican Superconductor Corporation
InventorsWARREN ELLIOTT BUCKLES, DOUGLAS C. FOLTS
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Abstract
A transfer of power between an energy storage device and a load is controlled by obtaining a DC voltage from the energy storage device, and controlling a phase angle of AC power delivered to the load to keep the DC voltage substantially constant. The phase angle of the AC power is controlled by controlling a current component of the AC power.
Claims25
A method of controlling a transfer of power between an energy storage device and a load, comprising:
- obtaining a DC voltage from the energy storage device;
- and
- controlling a phase angle of AC power delivered to the load to keep the DC voltage substantially constant.
A system for controlling a transfer of power between an energy storage device and a load, comprising:
- an inverter arranged between the energy storage device and the load, the inverter having input terminals which exchange DC voltage with the energy storage device and output terminals which exchange AC power with the load;
- and
- a controller which (i) obtains the DC voltage at the input terminals, and (ii) controls a phase angle of AC power delivered to the load to keep the DC voltage substantially constant.
A computer program stored on a computer-readable medium for controlling a transfer of power between an energy storage device and a load, the computer program comprising instructions that cause a computer to:
- obtain a DC voltage from the energy storage device;
- and
- control a phase angle of AC power delivered to the load to keep the DC voltage substantially constant.
Dependencies are inferred from the claim text.