Energy-balance control of PV cascaded multilevel grid-connected inverters under level-shifted and phase-shifted PWMs
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessRestricted access - publisher's policy
This paper presents an energy-balance control strat- egy for a cascaded single-phase grid-connected H-bridge multi- level 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.
CitationChavarria, 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", Gener 2013, vol. 60, núm. 1, p. 98-111.