Patent ID: 8688287

Claim:
A controller for a power circuit that interfaces distributed power generation with a power distribution grid, comprising: a first circuit that receives signals corresponding to the distributed power generation voltage and current, and outputs to the power circuit a signal for controlling the voltage or current of the distributed power generation; a dc voltage or dc current controller that receives a dc voltage or dc current of the power circuit and generates a power signal; a current reference generator that receives the power signal from the dc voltage or dc current controller and receives signals corresponding to the power distribution grid voltage and current, and outputs a current reference signal; an output current controller that minimizes a difference between the output grid current and the current reference signal from the current reference generator and outputs a first control signal; a harmonic rejection and/or dc rejection circuit that receives a signal corresponding to the power distribution grid voltage or current and outputs a second control signal; and a second circuit that receives the first and second control signals and outputs at least one gating signal that controls the power circuit; such that substantially harmonic-free and/or dc-free power is delivered to the power distribution grid.