Optimal generalized overmodulation for multiphase PMSM drives

Young, P.L.; Preindl, Matthias

doi:10.1109/apec.2017.7930740

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…As reflected in Figure 26, in the cases where the zero sequence would only be composed of even-order harmonics (e.g., 1ZS for even n with symmetrical WSA), these harmonics are in practice of zero magnitude and, hence, no benefit in this regard is attained by its injection, at least if non-ideal imbalance is neglected. Figure 26 also illustrates that the voltage gain provided by 1ZS with respect to conventional PWM tends to become lower with increasing n, as known from preceding publications, such as [147,150]. Improvement in dc-link utilization (%)…”

Section: Zero-sequence Voltage Injection: 1zs and Mzssupporting

confidence: 53%

“…A v dc shortage can be straightforwardly detected by monitoring the value of v dc [169], the modulation index [133,138,143,[147][148][149][150][151][152][153][154][155][156][157][158][159], or the speed [141]. The last option may be troublesome when relying on the hypothesis that v dc is constant, because it may not hold in practice.…”

Section: Detection Of Dc-link Voltage Shortagementioning

confidence: 99%

“…Since the machine back-EMF tends to increase with speed, if v dc decreases then the maximum speed and power are reduced as well [141,171]; • If the modulation index increases beyond the linear modulation range, overmodulation occurs. This means that low-order voltage harmonics are introduced, the VSD subspaces become coupled in terms of voltage, and the conventional PWM and control methods are no longer able to work properly [8,9,134,135,[137][138][139]142,143,145,[147][148][149][150][151][152][154][155][156]158,159,167]; • If the VSC ac voltage is reduced, the difference between its magnitude and that of the machine back-EMF may become substantially greater. As a consequence, overcurrent may occur [129,545].…”

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confidence: 99%

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A Comprehensive Survey on Fault Tolerance in Multiphase AC Drives, Part 1: General Overview Considering Multiple Fault Types

et al. 2022

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Multiphase drives offer enhanced fault-tolerant capabilities compared with conventional three-phase ones. Their phase redundancy makes them able to continue running in the event of faults (e.g., open/short-circuits) in certain phases. Moreover, their greater number of degrees of freedom permits improving diagnosis and performance, not only under faults affecting individual phases, but also under those affecting the machine/drive as a whole. That is the case of failures in the dc link, resolver/encoder, control unit, cooling system, etc. Accordingly, multiphase drives are becoming remarkable contenders for applications where high reliability is required, such as electric vehicles and standalone/off-shore generation. Actually, the literature on the subject has grown exponentially in recent years. Various review papers have been published, but none of them currently cover the state-of-the-art in a comprehensive and up-to-date fashion. This two-part paper presents an overview concerning fault tolerance in multiphase drives. Hundreds of citations are classified and critically discussed. Although the emphasis is put on fault tolerance, fault detection/diagnosis is also considered to some extent, because of its importance in fault-tolerant drives. The most important recent advances, emerging trends and open challenges are also identified. Part 1 provides a comprehensive survey considering numerous kinds of faults, whereas Part 2 is focused on phase/switch open-circuit failures.

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Section: Zero-sequence Voltage Injection: 1zs and Mzssupporting

confidence: 53%