Maximum DC-link voltage utilization for optimal operation of IPMSM

Schoenen, Timo; Krings, Andreas; Treek, Daniel van; Doncker, Rik W. De

doi:10.1109/iemdc.2009.5075409

Cited by 35 publications

(16 citation statements)

References 5 publications

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“…Six-step operation of the inverter has been reviewed by many researchers for its strong merit that the fundamental component of the inverter output voltage can be maximized [3]- [13]. That is, by the six-step operation, feasible inverter output voltage can be enhanced by 10.27%.…”

Section: Nomenclaturementioning

confidence: 98%

“…In the conventional studies about the six-step operation [3]- [13], dynamic control of current had not been addressed. References [3]- [7] mainly focused on voltage synthesis itself of the inverter.…”

Section: Nomenclaturementioning

confidence: 99%

“…However, only steady-state operation had been considered in these research studies, neglecting transientstate behavior of current. References [8]- [13] proposed voltage angle control methods. In these research studies, closed-loop current regulator was used only under the base speed.…”

Section: Nomenclaturementioning

confidence: 99%

“…1(b). Conventional voltage angle control algorithms proposed in [8]- [13] adjust θ for the torque control. The voltage angle θ can be directly calculated from (5) with given torque reference and rotating speed, or it can be adjusted by a proportional-integral (PI) regulator.…”

Section: Voltage Angle Control For Pmsm Drivesmentioning

confidence: 99%

“…Then, the voltage error terms in (17) can be interpreted as an unmanaged portion of current error. In (13), the voltage error terms are used as indicators that show current errors unmanaged by the current regulator. By the cross-coupling operation of (13), the voltage references are dynamically adjusted from the current error state.…”

Section: Part Iii: Voltage Reference Modification For Improved Dynmentioning

confidence: 99%

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Six-Step Operation of PMSM With Instantaneous Current Control

Kwon

Kim

Sul

2014

IEEE Trans. on Ind. Applicat.

185

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Six-step operation has many advantages in permanent-magnet synchronous machine (PMSM) drives such as maximum power utilization and widened flux-weakening region. However, due to the maximum utilization of inverter output, saturation of current regulator makes it difficult to maintain instantaneous current control capability. Accordingly, in most of conventional research studies, the six-step operation has been implemented by voltage angle control without current regulation, whose dynamic performance is quite unsatisfactory. This paper proposes a control scheme for the six-step operation of PMSM with enhanced dynamic performance of current control. By collaborative operation of dynamic overmodulation, flux weakening, and a technique for enhanced dynamic performance, the six-step operation is realized without losing instantaneous current control capability. Simulations and experiments are carried out to verify the effectiveness of the proposed control scheme. The experimental results show 17% extension of the constant torque region and 27% enhancement of torque capability at three times of the base speed. Index Terms-Current control, flux weakening, motor drives, overmodulation, permanent-magnet synchronous machines (PMSMs), six-step operation. NOMENCLATURESuperscript s Stationary reference frame. Superscript r Synchronously rotating rotor reference frame. Superscript * Reference value. P Number of poles. ω r Electrical rotor speed. V * s Magnitude of voltage reference. V s1 Fundamental component of inverter output voltage. v r ds , v r qs d−q components of inverter output in rotor reference frame. i r ds , i r qs d−q components of phase current in rotor reference frame. R s Stator resistance. L ds , L qs d−q components of stator self-inductance.

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Section: Nomenclaturementioning

confidence: 98%

Section: Nomenclaturementioning

confidence: 99%

Section: Nomenclaturementioning

confidence: 99%

Section: Voltage Angle Control For Pmsm Drivesmentioning

confidence: 99%

Section: Part Iii: Voltage Reference Modification For Improved Dynmentioning

confidence: 99%

See 3 more Smart Citations

Six-Step Operation of PMSM With Instantaneous Current Control

Kwon

Kim

Sul

2014

IEEE Trans. on Ind. Applicat.

185

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Analysis and implementation of a new method to retain the original speed and torque of synchronous reluctance motor during sustained voltage dip

Ghosh

Das

Bhuvaneswari

2019

IET Electric Power Applications

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This study presents the operation of a synchronous reluctance motor drive under a sustained voltage dip condition while being connected to a weak grid. In the presence of an input voltage dip, motor may not be able to produce sufficient torque and maintain its original speed. A new technique is proposed in this study to maintain the desired reference torque and speed during a sustained voltage dip. The proposed technique is realised by evaluating mathematically the motor's allowable voltage dip margin corresponding to an operating point pertaining to a particular torque and speed in the current locus diagram of the motor. With prior knowledge of the voltage dip margin for every operating point in the current locus diagram, it would be possible to retain the same reference torque and speed by moving to a new operating point, which can be with lesser or greater i d as compared to the initial operating point, in case a voltage dip greater than the tolerable margin occurs. To start with, voltage dip margin has been derived theoretically and the operation of the motor is investigated by deliberately introducing a voltage dip. The proposed methodology has been verified through simulations and experiments in this study.

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Simple current control of permanent magnet synchronous machines for railway traction operating in six‐steps

Fang

Tian

Yang

et al. 2020

IET Electric Power Applications

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Due to the voltage limitation of the inverter DC‐link of railway traction systems, six‐step operations are widely used in the high‐speed region to improve the voltage utilization and increase the maximum fundamental frequency. The magnitude of the output voltage fundamental harmonic reaches the maximum for six‐step operations, while only the phase angle can be adjusted. This limitation makes it challenging to control the instantaneous current of permanent magnet synchronous motors (PMSM). This paper proposes a single d‐axis current regulator flux‐weakening control scheme to improve the current control over six‐step operations of PMSM without changing the inverter output voltage modulation ratio by controlling only one degree of freedom. The voltage in six‐step operations is generated by synchronous space vector pulse width modulation based on basic bus clamping strategy with an effective limitation of the switching frequency in the full‐speed region. A simplified model of the current regulator is developed for the analysis and design of the controller parameters. This paper presents clear rules for entering and quitting six‐step operations effectively to achieve a smooth transition between double current regulators and the single current regulator control. The numerical results are verified by experimental measurements on a 7.5 kW PMSM drive.

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Maximum DC-link voltage utilization for optimal operation of IPMSM

Cited by 35 publications

References 5 publications

Six-Step Operation of PMSM With Instantaneous Current Control

Six-Step Operation of PMSM With Instantaneous Current Control

Analysis and implementation of a new method to retain the original speed and torque of synchronous reluctance motor during sustained voltage dip

Simple current control of permanent magnet synchronous machines for railway traction operating in six‐steps

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