Development and analysis of novel soft-starter∕energy-saver topology for delta-connected induction motors

Sundareswaran, K.; Jos, Bos Mathew

doi:10.1049/ip-epa:20050091

Cited by 19 publications

(7 citation statements)

References 26 publications

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“…Soft start is often defined as a technology that provides adjustable voltage to the machine either by mechanical or power electronic devices [13]. Common methods for soft start are using Korndorfer reduced voltage autotransformer or using autotransformer with capacitor assist [14]- [16], power electronic aided reducing voltage starters [17], star-delta soft start [18], [19], and adjustable voltage and frequency starting methods [20]- [26], etc. With the development of power electronics and advanced control strategies, inverter aided soft start has become widely accepted because of high dynamic performance and small start current.…”

Section: Synchronous Switching Of Non-line-start Permanent Magnet Synmentioning

confidence: 99%

Synchronous Switching of Non-Line-Start Permanent Magnet Synchronous Machines From Inverter to Grid Drives

Wang

et al. 2016

IEEE Trans. Power Electron.

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Non-line-start permanent magnet synchronous machines (NLSPMSMs) are normally considered not able to operate stably under grid drive. However, this paper proposes an effective control strategy to achieve soft start and synchronous switching of NLSPMSMs from inverter to grid drives so that to extend the application field. The system electromechanical model during switching is deduced and analysed numerically to verify the stability under grid drive. For the control strategy, model-based sliding-mode observer (SMO) is adopted during soft start for low cost position sensorless drive, and two digital phase lock loops (PLLs) are used to obtain the phases of grid and inverter voltages for phase tracking. Experiments are carried out on five NLSPMSMs with different rated powers and velocities, and test results show that all these prototypes can be safely switched to grid drive and robust to load variation. Tested waveforms are coincident with numerical analysis, and the system efficiencies of NLSPMSMs under inverter and grid drives are compared. Index Terms-Non-line-startpermanent magnet synchronous machine (NLSPMSM), system stability, soft start, synchronous switching. R 1 Phase winding resistance of NLSPMSM f Permanent magnet flux linkage of NLSPMSM J Mechanical inertia k D Damping coefficient of friction resistance Manuscript

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Section: Synchronous Switching Of Non-line-start Permanent Magnet Synmentioning

confidence: 99%

Synchronous Switching of Non-Line-Start Permanent Magnet Synchronous Machines From Inverter to Grid Drives

Wang

et al. 2016

IEEE Trans. Power Electron.

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“…As an alternative, a pulse-width modulation (PWM) control using power devices such as a silicon-controlled rectifier (SCR) or triode for alternating current (TRIAC) is used to address the problems mentioned above. Recently a soft starter has been used as an effective and low-cost method of reducing the inrush current and voltage sag through the use of thyristor-based voltage control [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Hybrid Sequential Start Control System for Large Inductive Loads

Kim¹,

Kim²

2015

Journal of Electrical Engineering and Technology

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-The inrush current of a large inductive load can be reduced with a soft starter; however, the large inrush current caused by simultaneous bulk starts (SBSs) cannot be effectively reduced. In order to reduce the high inrush current and voltage sag owing to the SBSs of large capacity inductive loads within a power network, a novel hybrid sequential start control system is proposed, implemented on embedded systems, and evaluated with a testbed in this study. From the experimental and simulation results of the proposed control system, the inrush current could be effectively restricted below the maximum current capacity of a power distributing board. Moreover, with the proposed system, power cost typically dictated by the peak power consumption can be fairly reduced, and the quality of the power system connected to the inductive loads can be efficiently increased.

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“…It is a simple and reliable electromechanical reduced-voltage starting method [1]. So it is called "soft-starter".…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the induction motors consume almost sixty percent electrical energy in the world and the efficiency of the motor is highest at the moment the induction motors is in full load. Because it often runs in the light load, even in the no load in practical application, the efficiency of the motor is low [1][2][3][4]. In this moment, in order to improve the efficiency, we could reduce the voltage of the induction motors' stator winding by changing connected mode of the stator winding .This method is proved to be available.…”

Section: Introductionmentioning

confidence: 99%

A SCR-based switch-control strategy of delta/wye switchover for delta connected induction motors

Shi

Cui

Zhu

2012

Proceedings of the 7th International Power Electronics and Motion Control Conference

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Development and analysis of novel soft-starter∕energy-saver topology for delta-connected induction motors

Cited by 19 publications

References 26 publications

Synchronous Switching of Non-Line-Start Permanent Magnet Synchronous Machines From Inverter to Grid Drives

Synchronous Switching of Non-Line-Start Permanent Magnet Synchronous Machines From Inverter to Grid Drives

A Novel Hybrid Sequential Start Control System for Large Inductive Loads

A SCR-based switch-control strategy of delta/wye switchover for delta connected induction motors

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