Soft Start/Adjustable Speed Systems for Multiple MW Rated Motors

Endrejat, F.; Pillay, Pragasen

doi:10.1109/pcicon.2006.359724

Cited by 6 publications

(15 citation statements)

References 20 publications

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“…The motivation for the SSASD system was based on the reduced switchgear fault level and busbar voltage drops which would not have been possible with the DOL start-up of the large motors. The only alternative to the SSASD concept would have been a dedicated starter of the adjustable frequency type and a dedicated ASD associated with significant additional capital cost and disadvantages as outlined in [14]. Furthermore the project requires a high availability which required redundancy in most drive system components especially since many of the components have not yet been proven in the field.…”

Section: A Project Overviewmentioning

confidence: 99%

“…Furthermore the project requires a high availability which required redundancy in most drive system components especially since many of the components have not yet been proven in the field. The SSASD concept was selected to improve availability further as described in [14].…”

Section: A Project Overviewmentioning

confidence: 99%

“…Process losses associated failures (due to ASDs) can easily negate their benefits. The fault tolerant operation of the ASD can be complimented, with a synchronisation, desynchronisation and process control scheme to improve process availability (to synchronise the adjustable speed driven motor before certain drive trip conditions) and also to facilitate soft starting of other motors [14]. New opportunities and benefits were identified and quantified when the multiple motor Soft Start and Adjustable Speed Drive (SSASD) concept is applied with near sinusoidal high output voltages with the capability to synchronize and de-synchronize Synchronous Motors (SMs) safely to multiple utility sources.…”

Section: Introductionmentioning

confidence: 99%

“…New opportunities and benefits were identified and quantified when the multiple motor Soft Start and Adjustable Speed Drive (SSASD) concept is applied with near sinusoidal high output voltages with the capability to synchronize and de-synchronize Synchronous Motors (SMs) safely to multiple utility sources. Benefits include significantly reduced capital cost of equipment, improved waveforms, energy savings, improved process controllability, reduced system stresses, reduced hazardous area requirements, improved power factor control and improved condition monitoring [14], whereof some are explored in further detail in this paper. This paper describes the design, installation, commissioning and initial operation experience of the first commissioned high output voltage MV VSI H bridge drive for multiple standard insulation synchronous motors at a major petrochemical plant.…”

Section: Introductionmentioning

confidence: 99%

“…Comparison is made to LCI systems to determine whether the proposed system is a viable alternative. Integration possibilities with existing and future systems are outlined in [14]. Pre-commissioning and system energisation were completed in January 2006, uncoupled testing of motors were done in February 2006 and load testing in July 2006.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Experience with new large adjustable speed drive technology for multiple synchronous motors

Endrejat

Blerk

Vignolo

2008

2008 5th Petroleum and Chemical Industry Conference Europe - Electrical and Instrumentation Applications

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New Voltage Source Inverter technology now exists with high output voltage (≥11kV) suitable for high power synchronous motor applications. The technology with an advanced control system can be used as a multiple motor soft starter and adjustable speed drive for selected motors with significant benefits. Design, commissioning and operation experience is described for a first of its kind installation with three synchronous motors rated 11kV 17MW. The overall control and communication system is described with specific attention to safety, redundancy and process availability. New synchronization and desynchronization scheme experience is described. Unique synchronous motor protection and excitation control schemes for both adjustable speed and line operation are outlined. Site recordings prove system ride-through capability in terms of voltage dips and bypass of internal power cells. Conclusions are given which support new voltage source technology as a viable alternative to conventional load commutated inverter technology for certain large synchronous motor applications. Suggestions are made for additions to present medium voltage adjustable speed drive standards.Index Terms -adjustable speed drive, synchronous motors, voltage source inverter, medium voltage, load commutated inverter

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Section: A Project Overviewmentioning

confidence: 99%

Section: A Project Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experience with new large adjustable speed drive technology for multiple synchronous motors

Endrejat

Blerk

Vignolo

2008

2008 5th Petroleum and Chemical Industry Conference Europe - Electrical and Instrumentation Applications

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Adaptive soft starter for a three‐phase induction‐motor driving device using a multifunctional series compensator

Tu¹,

Guo²,

et al. 2019

IET Electric Power Applications

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This study proposes an adaptive soft starter control for induction motors using a multifunctional series compensator (MFSC). The proposed MFSC can operate in two modes: (i) the compensation mode for voltage sags and (ii) the virtual impedance mode for soft starting. Various MFSC functions are obtained by controlling the output characteristics of the series inverter. In the voltage sag compensation mode, a voltage is injected in series with the fault phase; as a result, the terminal voltage of the motor remains constant. In the soft-starter mode, the proposed converter injects adjustable virtual impedance in each phase; as a result, the starting current can be limited to the desired value. A novel control scheme and the optimal parameter selection of the MFSC are also presented. The design methodology of the proposed MFSC is verified using simulations conducted in MATLAB/Simulink software. Experimental results prove the capability and effectiveness of the proposed MFSC.

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Resonance Overvoltages in Medium Voltage Multilevel Drive System

Endrejat

Pillay

2007

2007 IEEE International Electric Machines &Amp; Drives Conference

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multilevel inverters. The application configuration of the Abstract-Simulations and high voltage field tests indicate that system is described in [3]. A synchronisation, deunacceptable and unexpected motor terminal overvoltages and synchronisation and process control scheme is applied to waveform shapes can occur in the normal operating range with * * * -multilevel drive systems. These waveforms (if unattended) would iperven p oes a bilit (to sroie the aodj.st an have resulted in premature motor insulation failures. A case Xspee driv mtofo certin di tr cotons) A study of an 11 kV multilevel system is discussed. Simulations and also to facilitate soft starting of other motors. A calculations confirm the theory of resonance overvoltages. synchronisation reactor is applied to limit the current during Different solution possibilities are analyzed. Further simulations synchronization. System modelling to simulate the and investigations are performed to determine the optimal carrier phenomenon is described. Simplified equations are developed.frequency. Test results confirm that the proposed modification has the desired effect; with waveforms well within limits soti to address the problem are outlined and finally on stipulated by international standards. Simplified equations and site measurements prove the effectiveness of the proposed recommendations are provided to determine suitable application solution without any additional hardware.solutions. II. INITIAL TESTS Index Terms-AC motor drives, equivalent circuits, harmonicTests were done to determine the maximum voltage, analysis, load modeling, overvoltage protection, resonance, waveform shape and maximum du/dt values at the motor rotating machine testing.terminals. Similar tests were also performed before and after

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Soft Start/Adjustable Speed Systems for Multiple MW Rated Motors

Cited by 6 publications

References 20 publications

Experience with new large adjustable speed drive technology for multiple synchronous motors

Experience with new large adjustable speed drive technology for multiple synchronous motors

Adaptive soft starter for a three‐phase induction‐motor driving device using a multifunctional series compensator

Resonance Overvoltages in Medium Voltage Multilevel Drive System

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