Patent ID: 7248946

Claim:
A method for maximum power point tracking (MPPT) in a distributed generation system coupled to an alternating current (AC) power grid, comprising: comparing a current gain of the distributed generation system between zero crossings of the AC power grid; if the current gain has decreased in the current gain comparing step, comparing a change in power magnitude of the distributed generation system between the zero crossings of the AC power grid with an expected power decrement and, if the change in power magnitude is greater than a factor q of the expected power decrement, incrementing the current gain to set a peak operating point of the distributed generation system, otherwise decrementing the current gain to set the peak operating point of the distributed generation system; if the current gain has not decreased in the current gain comparing step, comparing the change in power magnitude of the distributed generation system between the zero crossings of the AC power grid with an expected power increment and, if the change in power magnitude is less than the factor q of the expected power increment, decrementing the current gain to set the peak operating point of the distributed generation system, otherwise comparing the change in power magnitude to a power incline function and incrementing or decrementing the current gain based on the comparison to set the peak operating point of the distributed generation system.