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High-efficiency module-integrated photovoltaic power conditioning system

High-efficiency module-integrated photovoltaic power conditioning system

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Published

A module-integrated, photovoltaic (PV) power conditioning system with a high-efficiency, high step-up DC–DC converter is proposed. The step-up DC–DC converter employs an active-clamp circuit for soft switching of the power semiconductor switches. Also, a dual series-resonant rectifier is employed in order to remove the reverse-recovery problem of the output-rectifying diodes and to provide a much higher voltage conversion ratio. The PV current is estimated without using a DC current sensor, and the PV current ripple reduction technique is suggested to reduce the current ripple without an external component. A 1 kW prototype for the PV voltage range of 30–60 V is implemented, and all algorithms and controllers are implemented on a single-chip microcontroller. Experimental results show that the power efficiency is 92.5–94% and the ripple current is 3.5% of the rated input current.

Inspec keywords: power semiconductor switches; microcontrollers; DC-DC power convertors; photovoltaic power systems; rectifying circuits

Other keywords: photovoltaic power conditioning system; active clamp circuit; soft switching; power semiconductor switches; voltage 30 V to 60 V; power 1 kW; dual series resonant rectifier; module integrated system; single chip microcontroller; DC current sensor; current ripple reduction; DC-DC converter

Subjects: Microprocessor chips; Power semiconductor devices; Relays and switches; Microprocessors and microcomputers; Power electronics, supply and supervisory circuits

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