Abstract
A new open-switch fault diagnosis method is proposed in this paper for the six-phase AC-DC converter based on the difference between the phase current and the corresponding reference using an adaptive threshold. The single and multiple open-switch faults are detected without any additional equipment and complicated calculations since the proposed fault detection method is integrated with the hysteresis controller. The proposed fault-tolerant technique reduces the value of overcurrent and total harmonic distortion on the side phases of the faulty one, by changing the switching signal of one switch in its opposite phase in some regions. This technique is performed without adding any legs, switches, or triode for alternating currents to the circuit. Finally, the proposed fault-tolerant technique is evaluated by MATLAB simulation and the results show its effectiveness.
Highlights
Due to the rapid growth of wind energy and its significant effect on the power grid, the reliability and availability of wind energy systems have become very important [1]
A wind turbine equipped with a sixphase permanent magnet synchronous generator (PMSG) requires a full-scale converter to inject the desired power into the grid
According to recent studies [5], the most vulnerable components of a wind turbine system are its power electronics devices and the most faults are originated from power switches, resulting in 25% of failures
Summary
Due to the rapid growth of wind energy and its significant effect on the power grid, the reliability and availability of wind energy systems have become very important [1]. Is paper presents a fault diagnosis technique for single and multiple open-switch faults in a six-phase AC-DC converter as part of a multiphase wind turbine system.
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