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Energy-Balance Modeling and Discrete Control for Single-Phase Grid-Connected PV Central Inverters

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4 Author(s)
Meza, C. ; Inst. of Ind. & Control Eng., Univ. Politec. de Catalunya, Barcelona ; Negroni, J.J. ; Biel, D. ; Guinjoan, F.

This paper presents a two-control loop design considering the nonlinear time-varying characteristics of a single-phase grid-connected photovoltaic (PV) full-bridge central inverter. The control scheme design is based on the energy-balance modeling of the PV system and enables the design of a voltage loop linear discrete controller ensuring the stability of the system for the whole range of PV array operating conditions. A set of experimental results carried out on a laboratory prototype is provided to validate the proposed approach.

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Industrial Electronics, IEEE Transactions on  (Volume:55 ,  Issue: 7 )