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Energy Storage Conversion Lab.

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Optimized Modeling and Control Strategy of the Single-Phase Photovoltaic Grid-Connected Cascaded H-bridge Multilevel Inverter
Content type 2018
Title of paper Optimized Modeling and Control Strategy of the Single-Phase Photovoltaic Grid-Connected Cascaded H-bridge Multilevel Inverter
Author Seongjun Lee and Jonghoon Kim
Publications Electronics
Status of publication published
Vol 7
Link 관련링크 https://www.mdpi.com/2079-9292/7/9/207 88회 연결

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.