Patent ID: 8467208
Filing Date: 2013-06-18
Classification: H02J,H02M,Y02B,Y02E

Abstract:
1. A method of controlling the power output of a converter having a DC input connected to a converter DC power bus and a single phase AC output connected to a converter AC power bus, the single phase AC output controlled by a plurality of converter switching devices connected between the converter DC power bus and the converter AC power bus, the method comprising the steps of: generating a unipolar output voltage DC signal proportional to the instantaneous absolute value of an output voltage at the single phase AC output; generating an output peak voltage DC signal proportional to the peak value of the rectified voltage of the output voltage; generating a converter current signal proportional to the instantaneous magnitude of the AC current on the converter AC power bus; generating a unit sine function value from the product of the unipolar output voltage DC signal and the inverse of the output peak voltage DC signal; generating a feed forward current signal from the product of the unit sine function value and a limit current value; generating a feed forward power signal from the product of the feed forward current signal and the unipolar output voltage DC signal; generating a feedback power signal from the product of the unipolar output voltage DC signal and the converter current signal; comparing the feed forward power signal to the feedback power signal to determine a difference power value equal to the difference between the value of the feed forward power signal and the value of the feedback power signal; inputting the difference power value to a power conversion switch device controller; and outputting a control signal from the power conversion switch device controller to the plurality of converter switching devices, the control signal proportional to the difference power value.