METHODS FOR CONTROLLING ELECTRICAL INVERTERS AND ELECTRICAL INVERTERS AND SYSTEMS USING THE SAME

摘要

A system for generating a duty cycle control signal for controlling an inverter power train providing an output current waveform to a grid operating with a grid voltage waveform compares a reference current waveform shaped to the grid voltage waveform with the output current waveform to generate an error signal. The error signal is used to generate a corrective control action signal, which is combined with a feed-forward signal representing a nominal duty cycle generated with a feed-forward function. The combination of the feed-forward signal and the corrective control action signal provide the duty cycle control signal.

主权项

1. A method of controlling an electrical inverter including an inverter power train for outputting power to an electrical grid comprising:
generating a reference current waveform in response to a request for power, the reference current waveform shaped by a shape of a grid voltage waveform on the electrical grid; comparing an inverter output current waveform with the reference current waveform to generate an error signal; generating a corrective control action signal from the error signal; generating a nominal duty cycle operating point signal with a feed-forward function; and adding the nominal duty cycle operating point signal and the corrective control action signal to generate a duty cycle control signal for controlling the duty cycle of the inverter power train and thereby provide an output current waveform with a shape substantially matching the shape of the grid voltage waveform.