Patent ID: 7158395

Claim:
A method of operating a power system comprising a switch mode inverter, a photovoltaic source electrically couplable to the inverter via a DC bus, a load electrically couplable to the inverter via an AC grid bus, and a controller communicatively coupled to supply control signals to the inverter, the method comprising: in an outer voltage feedback loop, determining a DC voltage reference value based at least in part on at least one operational characteristic of the photovoltaic source; and determining a current reference value at least in part on a sum of the determined DC voltage reference value and a DC voltage value indicative of a voltage across the DC bus; and in an inner current feedback loop, determining a current command value based at least in part on a sum of the determined current reference value and a current value indicative of a current through the load; and producing control signals for controlling the inverter based at least in part on the determined current command value.