Abstract
Until very recently, the fault tolerance in multiphase electric drives could only be achieved after fault localization and a subsequent modification of the control scheme. This scenario was profoundly shaken with the appearance of the natural fault tolerance, as the control reconfiguration was not required anymore. Even though the control strategy was highly simplified, it was still necessary to detect the open-phase fault (OPF) in order to derate the electric drive and safeguard its integrity. This work goes one step beyond and suggests the use of an automatic fault-tolerant control (AFTC) that also avoids the detection of the OPF. The AFTC combines the natural fault-tolerant capability with a self-derating technique, finally obtaining a hardware-free software-free fault tolerance. This achievement changes completely the rules of the game in the design of fault-tolerant drives, easing at the same time their industrial application. Experimental results confirm in a six-phase induction motor (IM) drive that the proposed AFTC provides a simple and safe manner to add further reliability to multiphase electric drives.
Highlights
The advantages of multiphase drives over their three-phase counterparts are nowadays well known, exploited and applied [1]
The voltage source converter (VSC) are supplied by a single 300 V DC power source and the control actions are performed by a digital signal processor (TMS320F28335 from Texas Instruments, (TI, Dallas, TX, USA))
As in test 1, an open-phase fault (OPF) was provoked at time t = 2 s in phase a1 (Figure 5e), so that the current cannot flow through the damaged phase
Summary
The advantages of multiphase drives over their three-phase counterparts are nowadays well known, exploited and applied [1]. It can be concluded that, feasible, the improved reliability is obtained with a rather high software complexity In this context, some recent works have suggested the use of a control scheme that remains valid both before and after the fault occurrence. The higher simplicity of the natural approach was a tipping point in the design of fault-tolerant regulation strategies for multiphase drives, stages one and four were still mandatory to protect the machine and converter from eventual over-currents. This work completes the simplification of the fault-tolerant control by suggesting a procedure for the self-derating of the multiphase electric drive. While the natural approach avoids stages two and three, the self-derating procedure skips stages one and four This software-free regulation strategy will be referred on as automatic fault-tolerant control (AFTC).
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