Analysis of multiphase space vector pulse-width modulation based on multiple d-q spaces concept

Ryu, Hee Jung; Kim, Jang-Hwan; Sul, Seung-Ki

doi:10.1109/tpel.2005.857551

Cited by 249 publications

(94 citation statements)

References 9 publications

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“…Assuming that ω is the fundamental frequency of the output phase voltages, through the transform of (3), the (10k±1)th harmonics of the phase voltages can be equivalently expressed as circular rotating space vectors with the frequency of (10k±1)ω in the stationary ab coordinate system, while the (10k±3)th harmonics of the phase voltages can be equivalently expressed as circular rotating space vectors with the frequency of (10k±3)ω in the stationary xy coordinate system [16]- [20]. 1 …”

Section: A Definition Of Switching Vectorsmentioning

confidence: 99%

Near-Five-Vector SVPWM Algorithm for Five-Phase Six-Leg Inverters under Unbalanced Load Conditions

Zheng¹,

Wang²,

Sui³

et al. 2014

Journal of Power Electronics

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Multiphase machines are characterized by high power density, enhanced fault-tolerant capacity, and low torque pulsation. For a voltage source inverter supplied multiphase machine, the probability of load imbalances becomes greater and unwanted low-order stator voltage harmonics occur. This paper deals with the PWM control of multiphase inverters under unbalanced load conditions and it proposes a novel near-five-vector SVPWM algorithm based on the five-phase six-leg inverter. The proposed algorithm can output symmetrical phase voltages under unbalanced load conditions, which is not possible for the conventional SVPWM algorithms based on the five-phase five-leg inverters. The cause of extra harmonics in the phase voltages is analyzed, and an xy coordinate system orthogonal to the z ab coordinate system is introduced to eliminate low-order harmonics in the output phase voltages.Moreover, the digital implementation of the near-five-vector SVPWM algorithm is discussed, and the optimal approach with reduced complexity and low execution time is elaborated. A comparison of the proposed algorithm and other existing PWM algorithms is provided, and the pros and cons of the proposed algorithm are concluded. Simulation and experimental results are also given. It is shown that the proposed algorithm works well under unbalanced load conditions. However, its maximum modulation index is reduced by 5.15% in the linear modulation region, and its algorithm complexity and memory requirement increase. The basic principle in this paper can be easily extended to other inverters with different phase numbers.

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Section: A Definition Of Switching Vectorsmentioning

confidence: 99%

Near-Five-Vector SVPWM Algorithm for Five-Phase Six-Leg Inverters under Unbalanced Load Conditions

Zheng¹,

Wang²,

Sui³

et al. 2014

Journal of Power Electronics

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“…Thus, the IS-PMSM has (6n ± 3)th harmonics which are in-phase with each phase [18], [19]. Therefore, n-axis current is not always zero.…”

Section: Modeling Of the Is-pmsmmentioning

confidence: 99%

A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control

Park¹,

Park²,

Bae³

et al. 2013

Journal of Power Electronics

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This paper proposes a new dead time compensation method of independent six-phase permanent magnet synchronous motors (IS-PMSM). The current of the independent phase machines contains odd-numbered harmonics because of the dead time and the nonlinear characteristics of the switching devices. By using the d-q-n three-dimensional vector analysis, these harmonics can be extracted at the n-axis current. Thus, the current distortion can be compensated by controlling the n-axis current of the IS-PMSM to zero. The proposed method is simple and can be easily implemented without additional hardware setup. The validity of the proposed compensation method is verified with simulations and several experiments.

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“…This approach has been followed in several studies for different number of phases. It has been most frequently considered in five-phase drives were the medium and large VSI space vectors are selected in each sector [23], [28]- [29] and they are applied with percentages of 61.8 % and 38.2 % respectively to cancel x-y components. The maximum peak fundamental of the output phase voltage (assuming dc voltage of 1 p.u.)…”

Section: B) Selection Of (N-1) Vectors Considering the D-q Planementioning

confidence: 99%

“…Basically, the percentage of application of large vectors is increased from 38.2 % to 100 % when the maximum modulation index is achieved. This approach has been followed for the generation of fundamental and third harmonic in torque enhancement applications [28]- [29], but the harmonic content is limited if the validity conditions are to be satisfied. The application of (n-1) vectors has also been considered for seven-phase drives [17] and for the general n-phase case [18]- [19].…”

Section: B) Selection Of (N-1) Vectors Considering the D-q Planementioning

confidence: 99%

“…This is the approach has been detailed in [20], [26]- [27] for the three main applications were non-zero xy components appear. The approach follows the idea suggested in [25] and proposes an improved criterion that converges with the solutions exposed in [17]- [19], [23], [28]- [29] for sinusoidal output voltage. However, the method proves to be general for any reference (including non-zero x-y components) and number of phase.…”

Section: C) Selection Of Active Vectors Considering the D-q Andmentioning

confidence: 99%

See 1 more Smart Citation

Multi-phase space vector pulse width modulation: Applications and strategies

Durán

Barrero

Toral

2007

REPQJ

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Abstract. Multi-phase machines and drives is a topic of growing relevance in recent years, and it presents many challenging issues that still need further research. This is the case of multi-phase space vector pulse width modulation (SVPWM), which shows not only more space vectors than the standard three-phase case, but also new subspaces where the space vectors are mapped. Different approaches have been recently followed, and the aim of this paper is to review and classify these methods. Comparative results are included to highlight the weak and strong points of the different methods. Finally some conclusions are extracted pointing out the problems that still need to be solved.

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Analysis of multiphase space vector pulse-width modulation based on multiple d-q spaces concept

Cited by 249 publications

References 9 publications

Near-Five-Vector SVPWM Algorithm for Five-Phase Six-Leg Inverters under Unbalanced Load Conditions

Near-Five-Vector SVPWM Algorithm for Five-Phase Six-Leg Inverters under Unbalanced Load Conditions

A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control

Multi-phase space vector pulse width modulation: Applications and strategies

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