Title :
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
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;
Conference_Titel :
Industrial Electronics, 2005. ISIE 2005. Proceedings of the IEEE International Symposium on
Conference_Location :
Dubrovnik, Croatia
Print_ISBN :
0-7803-8738-4
DOI :
10.1109/ISIE.2005.1528994
