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oai:recercat.cat:2117/157762026-02-07T07:58:36Zcom_2072_1033col_2072_452950

Energy-balance control of PV cascaded multilevel grid-connected inverters under level-shifted and phase-shifted PWMs Chavarría Roé, Javier Biel Solé, Domingo Guinjoan Gispert, Francisco Meza Benavides, Carlos Negroni Vera, Juan José Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica Universitat Politècnica de Catalunya. EPIC - Energy Processing and Integrated Circuits Àrees temàtiques de la UPC::Matemàtiques i estadística Discrete-time systems. Control theory. Control, Teoria de Models matemàtics Sistemes discrets en temps This paper presents an energy-balance control strategy for a cascaded single-phase grid-connected H-bridge multilevel inverter linking n independent 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 arrays operating conditions. The control design is adapted to Phase-Shifted and Level-Shifted Carrier PWM to share the control action among the cascadeconnected 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 7-level inverter are included to validate the proposed approach. Peer Reviewed Postprint (published version) 2012-01-26 Article Chavarría, J. [et al.]. Energy-balance control of PV cascaded multilevel grid-connected inverters under level-shifted and phase-shifted PWMs. "IEEE transactions on industrial electronics", 2013, vol. 60, issue 1, pp. 98-111. 0278-0046 https://hdl.handle.net/2117/15776 10.1109/TIE.2012.2186108 eng Open Access 14 p. application/pdf IEEE Press. Institute of Electrical and Electronics Engineers