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Energy-Balance Control of PV Cascaded Multilevel Grid-Connected Inverters Under Level-Shifted and Phase-Shifted PWMs

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5 Author(s)
Chavarria, J. ; Dept. of Electron. Eng., Univ. Politec. de Catalunya, Barcelona, Spain ; Biel, D. ; Guinjoan, F. ; Meza, C.
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This paper presents an energy-balance control strategy for a cascaded single-phase grid-connected H-bridge multilevel inverter linking n independent photovoltaic (PV) arrays to the grid. The control scheme is based on an energy-sampled data model of the PV system and enables the design of a voltage loop linear discrete controller for each array, ensuring the stability of the system for the whole range of PV array operating conditions. The control design is adapted to phase-shifted and level-shifted carrier pulsewidth modulations to share the control action among the cascade-connected bridges in order to concurrently synthesize a multilevel waveform and to keep each of the PV arrays at its maximum power operating point. Experimental results carried out on a seven-level inverter are included to validate the proposed approach.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:60 ,  Issue: 1 )

Date of Publication:

Jan. 2013

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