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Energies 2017, 10(10), 1657; doi:10.3390/en10101657

Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model

College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China
Author to whom correspondence should be addressed.
Academic Editor: Tomonobu Senjyu
Received: 20 September 2017 / Revised: 16 October 2017 / Accepted: 18 October 2017 / Published: 19 October 2017
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At present, the research on five-level inverters mainly involves the modulation algorithm and topology, and few articles study the five-level inverter from the control strategy. In this paper, the nonlinear passivity-based control (PBC) method is proposed for single-phase uninterruptible power supply inverters. The proposed PBC method is based on an energy shaping and damping injection idea, which is performed to regulate the energy flow of an inverter to a desired level and to assure global asymptotic stability, respectively. Furthermore, this paper presents a control algorithm based on the theory of passivity that gives an inverter in a photovoltaic system additional functions: power factor correction, harmonic currents compensation, and the ability to stabilize the system under varying injection damping. Finally, the effectiveness of the PBC method in terms of both stability and harmonic distortion is verified by the simulation and experiments under resistive and inductive loads. View Full-Text
Keywords: five-level inverter; passive E-L model; energy function; damping injection; SPWM five-level inverter; passive E-L model; energy function; damping injection; SPWM

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, T.; Cheng, Q.; Sun, W.; Chen, L. Grid-Connected Control Strategy of Five-level Inverter Based on Passive E-L Model. Energies 2017, 10, 1657.

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