Four-Degree-of-Freedom Overmodulation Strategy for Five-Phase Space Vector Pulsewidth Modulation

Bu, Feifei; Pu, Tianyu; Liu, Qi; Ma, Beijia; Gerada, Chris

doi:10.1109/jestpe.2020.2992659

Cited by 15 publications

(10 citation statements)

References 21 publications

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“…The same problem arises if the required ac voltage increases too much, even if v dc is constant. In both cases the requested modulation index m becomes excessive, with m being defined as the ratio of the amplitude of the α 1 -β 1 fundamental voltage reference over v dc /2 [138,149,151,152,159]. Several undesired effects may be caused by these situations, such as the following ones.…”

Section: Dc-link Voltage Shortagementioning

confidence: 99%

“…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%

“…For n = 5, its limit is at m = 1.052 p.u. When the modulation index exceeds the linear modulation range (black/beige lines in Figure 26), overmodulation occurs, which means that current-producing voltages have to be included, thus affecting to certain extent the machine performance (at least its SCL, and often also the torque ripple) [138,151,152,154,159].…”

Section: Overmodulationmentioning

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: Dc-link Voltage Shortagementioning

confidence: 99%

Section: Detection Of Dc-link Voltage Shortagementioning

confidence: 99%

Section: Overmodulationmentioning

confidence: 99%

mentioning

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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“…Among modulation strategies, the traditional space vector pulse-width modulation (SVPWM) synthesizes a reference voltage vector from two adjacent voltage vectors and a zero vector [20] . In this technique, the DC bus voltage utilization increases along with a reduction in the torque ripple and stator current harmonics [21] .…”

Section: Introductionmentioning

confidence: 99%

Fault-tolerant deadbeat model predictive current control for a five-phase PMSM with improved SVPWM

Saeed

Zhao

Wang

et al. 2021

Chin. J. Electr. Eng.

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The main drawbacks of traditional finite set model predictive control are high computational load, large torque ripple, and variable switching frequency. A less complex deadbeat (DB) model predictive current control (MPCC) with improved space vector pulse-width modulation (SVPWM) under a single-phase open-circuit fault is proposed. The proposed method predicts the reference voltage vector in the α-β subspace by employing the deadbeat control principle on the machine predictive model; thus, the exhaustive exploration procedure is avoided to relieve the computational load. To perform the constant switching frequency operation and achieve better steady-state performance, a modified SVPWM strategy is developed with the same conventional structure, which modulates the reference voltage vector. This new approach is based on a redesigned and adjusted post-fault virtual voltage vector space distribution that eliminates the y-axis harmonic components in the x-y subspace and ensures the generation of symmetrical PWM pulses. Meanwhile, the combined merits of the DB, MPCC, and SVPWM methods are realized. To verify the effectiveness of the proposed control scheme, comparative experiments are performed on a five-phase permanent magnet synchronous motor (PMSM) drive system.

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Extended Overmodulation Operation of Space Vector PWM for Traction Motor Control at Low Switching Frequency

Altintas

Kocabaş

2022

IEEE Access

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There are several benefits of fully utilization of DC link voltage in railway traction applications in terms of increasing inverter output voltage, satisfying power-torque demand and component sizing. To meet traction system requirements; mostly space vector pulse width modulation (SVPWM) is preferred since it has lower harmonic contents and larger voltage reservoir than the others such as sinusoidal PWM (SPWM). Despite extended linear range of SVPWM, it may not be sufficient for traction systems due to high power requirements and low ratio of switching frequency to inverter output frequency. To overcome this problem, an algorithm having functional in the overmodulation range of SVPWM up to square wave modulation and applicable at low sampling, switching frequencies is proposed. Proposed method has ability of soft transition to overmodulation area and covers continuously all the section. Also, calculation of modulation signals is independent from sampling period. The detailed design method is given to calculate modulation signals to be compared with carrier wave in two different overmodulation sections and implemented. Implementations are used in practical experiments to verify the effectivity of proposed method. Moreover, practical experiments to ensure stability of the method are conducted with high powered traction motor in low switching frequency.

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Four-Degree-of-Freedom Overmodulation Strategy for Five-Phase Space Vector Pulsewidth Modulation

Cited by 15 publications

References 21 publications

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

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

Fault-tolerant deadbeat model predictive current control for a five-phase PMSM with improved SVPWM

Extended Overmodulation Operation of Space Vector PWM for Traction Motor Control at Low Switching Frequency

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