Fault diagnosis and fault-tolerant control of photovoltaic micro-inverter

An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topology of a grid-connected micro-inverter, a mathematical model of the flyback conver...

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Bibliographic Details
Published in:Journal of Central South University 2016-09, Vol.23 (9), p.2284-2295
Main Authors: Li, Zhou, Peng, Tao, Zhang, Peng-fei, Han, Hua, Yang, Jian
Format: Article
Language:English
Subjects:
Control Science and Information Engineering
Converters
Engineering
Fault diagnosis
Fault tolerance
Inverters
Mechanical Engineering
Metallic Materials
Redundancy
State observers
Topology
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Summary:An observer-based fault diagnosis method and a fault tolerant control for open-switch fault and current sensor fault are proposed for interleaved flyback converters of a micro-inverter system. First, based on the topology of a grid-connected micro-inverter, a mathematical model of the flyback converters is established. Second, a state observer is applied to estimate the currents online and generate corresponding residuals. The fault is diagnosed by comparing the residuals with the thresholds. Finally, a fault-tolerant control that consists of a fault-tolerant topology for the faulty switch and a simple software redundancy control for the faulty current sensor, is proposed to achieve a fault-tolerant operation. The feasibility and effectiveness of the proposed method has been verified by simulation and experimental results.
ISSN:2095-2899
2227-5223
DOI:10.1007/s11771-016-3286-7