System Model and Performance Evaluation of Single-Stage Buck-Boost-Type Manitoba Inverter for PV Applications

This article presents a control methodology for a recently proposed single-stage buck-boost-type inverter in photovoltaic (PV) applications. A wide range of input voltage is covered, and the dc power is effectively converted into the grid power within a single-stage system. However, from the topolog...

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Bibliographic Details
Published in:IEEE journal of emerging and selected topics in power electronics 2020-12, Vol.8 (4), p.3457-3466
Main Authors: Siu, Ken King-Man, Ho, Carl Ngai Man
Format: Article
Language:English
Subjects:
Capacitors
Control methods
Control stability
Control systems design
Dynamic characteristics
Electric potential
Energy conversion
Inductors
Inverters
Maximum power
Maximum power point trackers
Maximum power point tracking (MPPT)
Methodology
Performance evaluation
photovoltaic (PV) inverter
Photovoltaic cells
Power system stability
single-stage buck–boost
Stability analysis
Switches
Systems analysis
Voltage
Voltage control
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Summary:This article presents a control methodology for a recently proposed single-stage buck-boost-type inverter in photovoltaic (PV) applications. A wide range of input voltage is covered, and the dc power is effectively converted into the grid power within a single-stage system. However, from the topological characteristics, a { C\!L} filter is always formed at the system output, which results in a resonance pole in the control system. In the PV system, the panel output voltage keeps varying. Under the traditional control method, stability issues may occur, which poses a challenge to controller design. Thus, targeting PV applications, a comprehensive control methodology is presented in this article. Under such a control scheme, a high-quality ac grid power is guaranteed and the power conversion is maintained in a stable manner. Meanwhile, the maximum power point (MPP) of PV panels is always tracked and no additional current sensor is required in the MPP tracking (MPPT) design. In this article, a detailed system analysis is presented, which includes the system modeling and the stability evaluation. The performance of the presented control methodology is experimentally verified in a 750-W PV inverter platform. Both steady state and dynamic characteristics are in good agreement with theoretical knowledge.
ISSN:2168-6777
2168-6785
DOI:10.1109/JESTPE.2019.2952077