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http://dx.doi.org/10.5370/JEET.2013.8.4.752

Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters  

Kim, Gwang-Seob (Department of Electrical and Computer Engineering, Ajou University)
Lee, Kyo-Beum (Department of Electrical and Computer Engineering, Ajou University)
Lee, Dong-Choon (Department of Electrical Engineering, Yeungnam University)
Kim, Jang-Mok (Department of Electrical Engineering, Pusan National University)
Publication Information
Journal of Electrical Engineering and Technology / v.8, no.4, 2013 , pp. 752-759 More about this Journal
Abstract
This paper proposes a method for fault diagnosis and fault-tolerant control of DC-link voltage sensor for two-stage three-phase grid-connected PV inverters. Generally, the front-end DC-DC boost converter tracks the maximum power point (MPP) of PV array and the rear-end DC-AC inverter is used to generate a sinusoidal output current and keep the DC-link voltage constant. In this system, a sensor is essential for power conversion. A sensor fault is detected when there is an error between the sensed and estimated values, which are obtained from a DC-link voltage sensorless algorithm. Fault-tolerant control is achieved by using the estimated values. A deadbeat current controller is used to meet the dynamic characteristic of the proposed algorithm. The proposed algorithm is validated by simulation and experiment results.
Keywords
Fault diagnosis; Fault-tolerant control; Grid-connected inverter; Sensorless control; PV inverters; Deadbeat control;
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Times Cited By KSCI : 3  (Citation Analysis)
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