Boost-buck inverter variable structure control for grid-connected photovoltaic systems with sensorless MPPT

Author

Meza, C. ; Biel, D. ; Negroni, J. ; Guinjoan, F.

Author_Institution

Inst. of Industrial & Control Eng., UPC, Barcelona, Spain

Volume

2

fYear

2005

fDate

20-23 June 2005

Firstpage

657

Abstract

The present work describes the analysis, modeling and control of a transformerless boost-buck power inverter used as a DC-AC power conditioning stage for grid-connected photovoltaic (PV) systems. The power conditioning system´s control scheme includes a variable structure controller to assure output unity power factor and a sensorless maximum power point tracking (MPPT) algorithm to optimize the PV energy extraction. To maximize the steady-state input-output energy transfer ratio a discrete linear controller is designed from a large-signal sampled data model of the system. The achievement of the DC-AC conversion at unity power factor and the efficient PVs energy extraction are validated with simulation results.

Keywords

DC-AC power convertors; control system synthesis; invertors; photovoltaic power systems; power factor; power grids; variable structure systems; DC-AC power conditioning stage; boost-buck inverter variable structure control; discrete linear controller; grid-connected photovoltaic systems; large-signal sampled data model; maximum power point tracking algorithm; sensorless MPPT; steady-state input-output energy transfer ratio; unity power factor; Control system analysis; Control systems; Data mining; Inverters; Photovoltaic systems; Power conditioning; Power system modeling; Reactive power; Sensorless control; Solar power generation;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial Electronics, 2005. ISIE 2005. Proceedings of the IEEE International Symposium on

Conference_Location

Dubrovnik, Croatia

Print_ISBN

0-7803-8738-4

Type

conf

DOI

10.1109/ISIE.2005.1528994

Filename

1528994