A Quasi-Z-Source-Based Space-Vector-Modulated Cascaded Four-Level Inverter for Photovoltaic Applications

This article proposes a single-stage buck-boost topology for photovoltaic (PV) applications with a three-phase output. This power converter is constituted by three quasi-Z-source (qZS) networks that are integrated with a four-level cascaded multilevel inverter (FCMI). Compared to the conventional mu...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2022-08, Vol.10 (4), p.4749-4762
Main Authors: P., Manoj, Annamalai, Kirubakaran, Dhara, Sumon, Somasekhar, V. T.
Format: Article
Language:English
Subjects:
Circuits
Configurations
Electric potential
Experimentation
Four-level cascaded multilevel inverter (FCMI)
Inverters
level-shifted pulse width modulation (PWM)
Maximum power tracking
Modulation
Multilevel inverters
Network topologies
Network topology
Photovoltaic cells
Power converters
Power factor
quasi Z-source (qZS)
Switches
Topology
Voltage
voltage boosting
Voltage control
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Summary:This article proposes a single-stage buck-boost topology for photovoltaic (PV) applications with a three-phase output. This power converter is constituted by three quasi-Z-source (qZS) networks that are integrated with a four-level cascaded multilevel inverter (FCMI). Compared to the conventional multilevel inverter (MLI) configurations, such as the neutral-point-clamped (NPC) and the cascaded H-bridge (CHB) inverters, the proposed topology is structurally simple with lesser number of components. The proposed power converter and its modulation scheme enhance the boost factor by 50% compared to the aforementioned topologies while alleviating the voltage stress on the switching devices. It is shown that the proposed converter can regulate the output voltage in the stand-alone mode by controlling the shoot-through duty ratio of the qZS networks. Furthermore, it is shown that the proposed converter can be interfaced with the grid by controlling the modulation index along with the shoot-through duty ratio to achieve the twin objectives of maximum power point tracking (MPPT) and the unity power factor (UPF) operation with the grid. The simulation studies and experimentation on a scaled-down laboratory prototype verify the steady-state and dynamic performances of the proposed power circuit configuration and the associated control strategy.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2021.3125695