Patent ID: 6282104
Filing Date: 2001-08-28
Classification: H02M

Abstract:
A control system for providing an electrical connection between a power source and a utility connection or ac loads and controlling the quantity of dc currents and the amplitude of even harmonic currents in the power output of the power source,the control system comprising:a power converter connected to the power source for receiving the power output of the power source, converting the power output to a converted power selected for transmittal to the utility connection or the ac loads, and transmitting the converted power on an outlet lead of the power converter;a voltage transformer connected to the outlet lead of the power converter for receiving the converted power to at least partially block dc current in the converted power and for transmitting the dc blocked, converted power on a control system outlet lead to the utility connection or the ac loads;a feedback control loop for measuring even harmonic currents entering the voltage transformer and transmitting a control signal based on the measured even harmonic currents wherein the control signal adjusts the shape of the converted power to limit dc current injection into the voltage transformer; andmeans for adjusting the shape of the converted power in response to the control signal.