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

  • Mechanical Engineering, Control Science and Information Engineering
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Abstract

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.

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Authors and Affiliations

  1. School of Information Science and Engineering, Central South University, Changsha, 410083, China

    Zhou Li  (李舟), Tao Peng  (彭涛), Peng-fei Zhang  (张鹏飞), Hua Han  (韩华) & Jian Yang  (杨建)

Authors
  1. Zhou Li  (李舟)
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  2. Tao Peng  (彭涛)
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  3. Peng-fei Zhang  (张鹏飞)
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  4. Hua Han  (韩华)
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  5. Jian Yang  (杨建)
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Corresponding author

Correspondence to Tao Peng  (彭涛).

Additional information

Foundation item: Project(2012AA051601) supported by the High-Tech Research and Development Program of China

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Li, Z., Peng, T., Zhang, Pf. et al. Fault diagnosis and fault-tolerant control of photovoltaic micro-inverter. J. Cent. South Univ. 23, 2284–2295 (2016). https://doi.org/10.1007/s11771-016-3286-7

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  • DOI: https://doi.org/10.1007/s11771-016-3286-7

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