Starting large synchronous motors in weak power systems

LeDoux, Kurt; Visser, Paul J.; Hulin, Dwight; Nguyen, Hien

doi:10.1109/pcicon.2013.6666022

Cited by 7 publications

(7 citation statements)

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“…The impact of the inrush current on voltage drops in the power supply grid can be limited by starting the motor with an additional capacitor in the supply circuit [11,12,14,15]. The capacitor is the source of reactive current drawn by the motor.…”

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

“…In order to limit the impact of the inrush current on the power supply grid the stator starter in the form of a start-up reactor is also used [11,12,14,15,17,18]. As a result of the reactor impedance, put in series with the stator windings, the inrush current of the motor is reduced, and the motor voltage is reduced by the reactor voltage drop.…”

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

“…At a speed close to the synchronous speed the reactor is short-circuited. Mitigation of the start-up effects by reducing the motor supply voltage is also performed by Korndorfer autotransformer system [11,12,14,15,17]. The motor takes the inrush current proportionally to the voltage reduced by the autotransformer.…”

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

“…Soft start is possible in drive systems with variable frequency power supply [11][12][13][14][15][16]. Systems based on inverters supplying the stator windings with appropriate control, e.g.…”

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

“…Thanks to the dissemination of modular multilevel converters for medium voltage in recent years [2][3][4][5][6][7][8][9][10] it is possible to mitigate the start-up effects of large power motors [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Start-up of large-power synchronous motor with the 6 kV voltage source inverter and microprocessor-controlled unit for excitation supply

Hyla

2018

Journal of Electrical Engineering

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The paper presents idea and practical implementation of a medium voltage synchronous drive with a voltage source inverter in the stator circuit and a microprocessor controlled unit for excitation supply. Construction of both devices was presented, and methods of their cooperation were described. Selected start-up methods of large power synchronous motors were presented. Exemplary realization was discussed. Measurement results of the direct full-voltage start-up and frequency start-up of a real 1.25 MW 6 kV fan drive system were compared and discussed.K e y w o r d s: synchronous motor, start-up methods, voltage source inverter, variable-frequency drive, excitation control

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Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

Section: Large Power Ac Motors Start-up Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Start-up of large-power synchronous motor with the 6 kV voltage source inverter and microprocessor-controlled unit for excitation supply

Hyla

2018

Journal of Electrical Engineering

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Start of a synchronous motor using rotor field polarity inversion and rotor back-emf sensing

Lundin

Evestedt

Abrahamsson

et al. 2020

2020 International Conference on Electrical Machines (ICEM)

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Synchronous motors are hard to line start due to torque pulsations at zero rotor speed and low starting torque when started using induced current in a damper squirrel cage. By inverting the rotor pole polarity at appropriate times it is possible to, in principle, achieve uniform torque, albeit pulsating with twice the line frequency at zero initial rotor speed. This has been demonstrated in earlier efforts. In this paper, we demonstrate that high torque starting using the back-emf in the field winding as a triggering signal for the rotor polarity inversion is possible. We further discuss the origin of the rotational energy and active and reactive power pulsations. Finally, we show that it is possible to operate a synchronous motor at continuous asynchronous speed by inverting the polarity of the rotor current and adjusting the field current accordingly, although down rated.

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