Design of cascaded control loop for solar power optimizer based on a buck-boost converter

Leonardo Callegaro, Mihai Ciobotaru, John E. Fletcher, Pablo Acuna Rios, Daniel J. Pagano

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

4 Citations (Scopus)

Abstract

Power optimizers are dc-dc converters, featuring maximum power point (MPP) tracking operation, deployed on a per module basis in modern PV plants, adding value on flexibility, diagnostic capability and energy yield. This paper considers the non-inverting buck-boost converter used as a power optimizer, with emphasis on the control scheme applied to it. In the analysed configuration, the converter inductor current and PV voltage are controlled in a cascaded fashion, where the outer loop controlling the PV voltage provides the inductor current reference for the fast inner loop. With the selected control technique, the transfer functions describing the plant exhibit a first order like behaviour, hence facilitating the controller design, allowing to avoid using lead-lag networks or controllers whose tuning is non-trivial. The controlled converter performance in tracking the MPP voltage is analysed by means of simulations after a simple proportional integral (PI) controller is added in the voltage loop and another PI controller is adopted in the current loop.
Original languageEnglish
Title of host publication2016 IEEE 2nd Annual Southern Power Electronics Conference (SPEC 2016)
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages845-850
Number of pages6
ISBN (Electronic)9781509015467
ISBN (Print)9781509015474
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event2016 IEEE 2nd Annual Southern Power Electronics Conference, SPEC 2016 - Auckland, New Zealand
Duration: 5 Dec 20169 Dec 2016

Conference

Conference2016 IEEE 2nd Annual Southern Power Electronics Conference, SPEC 2016
CountryNew Zealand
CityAuckland
Period5/12/169/12/16

Fingerprint

Dive into the research topics of 'Design of cascaded control loop for solar power optimizer based on a buck-boost converter'. Together they form a unique fingerprint.

Cite this