2-1 Power conversion circuit
(1) Step-up chopper
Step-up chopper is used to control dc power from solar array to the dc link side of the PWM inverter, by which
1069
CH3365-4/94/0000-1069 $4.00 0 1994 IEEE First WCPEC; Dec. 5-9, 1994; Hawaii
the solar cell voltage becomes boosted according to the power flow.
Suppose that the load is constant, or that the dc power transferred to 3-phase induction motor through inverter becomes fixed As the power amount from the step-up chopper becomes increased, so the power from the utility could be decreased At this instant the step-up chopper makes the solar cell output power be maximized by controlling the duty ratio according to the environmental situations
(