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Energies 2017, 10(11), 1805; https://doi.org/10.3390/en10111805

Energy Balance Control of a Cascaded Multilevel Inverter for Standalone Solar Photovoltaic Applications

School of Electric Power Engineering, South China University of Technology, Guangzhou 510641, China
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Received: 20 September 2017 / Revised: 27 October 2017 / Accepted: 2 November 2017 / Published: 9 November 2017
(This article belongs to the Section Energy Fundamentals and Conversion)
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Abstract

This paper presents a clock phase-shifting (CPS) energy balance control (EBC) method for cascaded half-bridge multilevel inverters in standalone solar photovoltaic (PV) systems. It is based on the conservation of energy in each cascaded unit. By shifting the phase of the clock pulse of each cascaded unit, a staircase-like output voltage is obtained. The CPS EBC not only regulates the staircase-like output voltage of the cascaded multilevel inverters accurately under static conditions, but also suppresses the fluctuations of DC sources and improves its dynamic responses to load steps. Thus, the problems existing in solar PV systems using the cascaded multilevel inverters are avoided. Results obtained from simulations and experiments are presented to verify the feasibility and advantages of the proposed control method. View Full-Text
Keywords: solar photovoltaic systems; cascaded multilevel inverter; energy balance control solar photovoltaic systems; cascaded multilevel inverter; energy balance control
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Wang, L.; Wu, Q.; Tang, W. Energy Balance Control of a Cascaded Multilevel Inverter for Standalone Solar Photovoltaic Applications. Energies 2017, 10, 1805.

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