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This paper proposes a fault diagnosis method of the line-to-line voltage sensors in grid-connected 3-phase voltage source converters. The line-to-line voltage sensors are an essential device to obtain the information of the grid side voltages for controlling the converters. If there are problems in the voltage sensors by some faults, the controller obtains wrong information of the grid voltage. It...
Compared to conventional 2-level AC/DC PWM converter, the 3-phase NPC active rectifier has a high number of power semi-conductors. Hence the possibility of the open-switch faults is much higher. Due to the many number of active elements, the detection and the tolerant control of the open-switch faults are more complicated than the conventional 2-level converter. Furthermore, the open-switch faults...
There is a possibility of open-switch fault of 3-phase AC-DC PWM (Pulse Width Modulation) converter due to some troubles of the switching devices. In this case, the converter causes the unbalanced input AC currents including harmonics and the ripple of DC-link voltage. This paper proposes the phase detection method of open-switch fault and the fault-tolerant control algorithm to minimize the unbalance...
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