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Open AccessArticle

Optimized Modeling and Control Strategy of the Single-Phase Photovoltaic Grid-Connected Cascaded H-bridge Multilevel Inverter

by Seongjun Lee 1 and Jonghoon Kim 2,*
1
School of Mechanical System & Automotive Engineering, Chosun University, Gwangju 61452, Korea
2
Department of Electrical Engineering, Chungnam National University, Daejeon 34134, Korea
*
Author to whom correspondence should be addressed.
Electronics 2018, 7(9), 207; https://doi.org/10.3390/electronics7090207
Received: 11 August 2018 / Revised: 10 September 2018 / Accepted: 14 September 2018 / Published: 18 September 2018
(This article belongs to the Special Issue Renewable Electric Energy Systems)
This paper presents the modeling and control-loop design method with an inverted decoupling scheme of a single-phase photovoltaic grid-connected five-level cascaded H-bridge multilevel inverter. For the unity power factor, the proportional and integral current controller with a duty ratio feed-forward compensation is used. In addition, in order to achieve the maximum power point tracking of each photovoltaic array, when the stacked modules are in the partial shading condition, each direct current (DC) voltage is stably controlled to their maximum power points (MPP) by dedicated voltage controllers of each H-bridge module. This paper also presents a control method that minimizes the effect of the loop-interaction in the design of an individual DC-link voltage control loop in a two-input two-output system. The proposed control methods of the cascaded H-bridge multilevel inverter are validated through the simulation and experimental results of the 2-kW prototype hardware. View Full-Text
Keywords: Cascade H-bridge; multilevel inverter; two-input two-output; individual voltage control; maximum power point Cascade H-bridge; multilevel inverter; two-input two-output; individual voltage control; maximum power point
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MDPI and ACS Style

Lee, S.; Kim, J. Optimized Modeling and Control Strategy of the Single-Phase Photovoltaic Grid-Connected Cascaded H-bridge Multilevel Inverter. Electronics 2018, 7, 207.

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