EPE Association: EPE 2018 - DS1h: Adjustable Speed Drives

EPE 2018 - DS1h: Adjustable Speed Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 04: Electrical Machines and Drive Systems > EPE 2018 - DS1h: Adjustable Speed Drives

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   Advanced Uncertainty Calculation Method for Frequency Converter Loss Determination
By Hannu KÄRKKÄINEN [View]
[Download]

Abstract: The loss determination based on input and output powers is the most commonly used method in electrical drives. However, the accuracy of the measurement results can be strongly questioned. Here, a workflow starting from measurement instruments' data sheet information to final measurement uncertainty result is presented for three different frequency converters.

   Electric drives Power-Hardware-in-the-Loop system structures
By Mikhail MUDROV [View]
[Download]

Abstract: Power-Hardware-in-the-Loop (PHiL) system for electric drives application based on power converter with Field Programmable Gate Array (FPGA)-based control system is discussed. PHiL structures are under discussion as well. During the PHiL mathematical model analysis instantaneous current repeating quality is increased. Variable frequency drive (VFD) was selected for testing.

   Error Effects of Compensation Circulating Current of Modular Multilevel Converters in Low Frequency Motor Drive Operation
By Longya XU [View]
[Download]

Abstract: Errors of the high-frequency compensation circulating current are originally investigated for modular multilevel converters (MMCs) in low speed drive operation. The results reveal these errors causing serious energy unbalance in the MMC arms, resulting in a large submodule voltage fluctuation and unstable drive operation. A remedy approach is proposed to minimize the error effects.

   Highly integrated Synchronous Reluctance Motor Drive System with SiC-Mosfets
By Boris JANJIC [View]
[Download]

Abstract: The design of a highly integrated synchronous reluctance motor drive system with SiC-Mosfets is presented. The motor-drive system has a power of 22 kW at 3000 /min rated speed. The power electronics is radially integrated on the motor housing. With the used modular splitting of power electronic an even distribution of the losses on the motor housing is possible. Due to the compact design and combine air cooling of motor and drive the volume of the drive system with new concept is reduced by 25 \% compared to the actual solution. In this paper the comparison between calculated and measured results is given.

   Input Admittance Model for the Sensorless Controlled Slim DC-link Drive
By Yang FENG [View]
[Download]

Abstract: Sensorless control is an effective method to increase the overall system reliability in adjustable speed drive and reduce the cost for a slim dc-link drive. However such drive system may suffer from instability issue caused by the constant power load operation and also the reduced dc-link capacitance. In order to investigate this problem, the input admittance model of a sensorless controlled slim dc-link drive system is developed in this paper. The developed model can predict the system stability performance in a PMSM or SynRM drive system, and its effectiveness is verified by the simulations and experiments on a SynRM test bench.

   Operation of fault-tolerant inverters with DC-link midpoint connection for adjustable speed drives
By Michael GLEISSNER [View]
[Download]

Abstract: Some fault-tolerant three-phase inverters are based upon a reconfiguration to an inverter with only two active phases and a DC-link midpoint connection after any semiconductor failure. Thus, the maximum output voltage is halved and the DC-link midpoint capacitor voltage ripple depends on output frequency and output current of the inverter. These limiting effects on the operation range of adjustable speed drives as well as software and hardware based countermeasures are presented in this paper.

   Speed Estimation in Induction Motors Using Additional Windings
By Meryl Teresa JOY [View]
[Download]

Abstract: Induction motors are widely used in industrial and consumer applications by virtue of their ruggedness, reliability and low cost. Motion control methods of electrical motors such as vector control techniques require accurate position and speed signals fed to the controller. The conventional use of mechanical sensors for speed estimation in motor control makes it expensive and space consuming in applications that have limitations of space. Therefore, speed-sensorless methods for motor control have relevant scope in the industry. In this paper, a method for speed estimation of an induction motor using a few additional sensing windings within the stator is proposed. Rotor position information can be extracted from externally injected signals and from the induced voltages in these additional windings at different speeds and standstill. Tests have been conducted on an induction motor with the sensing windings wound on the stator. The signals measured from these windings are found to have effects from the rotation of the rotor due to slot harmonics. Results from finite element analysis and from the test bench measurements are discussed. The speed estimation is compared with the actual speed and the results show that this method promises efficient speed estimation in induction motors.

EPE 2018 - DS1h: Adjustable Speed Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2018 ECCE Europe - Conference > EPE 2018 - Topic 04: Electrical Machines and Drive Systems > EPE 2018 - DS1h: Adjustable Speed Drives
	[return to parent folder]

	Advanced Uncertainty Calculation Method for Frequency Converter Loss Determination By Hannu KÄRKKÄINEN	[View] [Download]
Abstract: The loss determination based on input and output powers is the most commonly used method in electrical drives. However, the accuracy of the measurement results can be strongly questioned. Here, a workflow starting from measurement instruments' data sheet information to final measurement uncertainty result is presented for three different frequency converters.

	Electric drives Power-Hardware-in-the-Loop system structures By Mikhail MUDROV	[View] [Download]
Abstract: Power-Hardware-in-the-Loop (PHiL) system for electric drives application based on power converter with Field Programmable Gate Array (FPGA)-based control system is discussed. PHiL structures are under discussion as well. During the PHiL mathematical model analysis instantaneous current repeating quality is increased. Variable frequency drive (VFD) was selected for testing.

	Error Effects of Compensation Circulating Current of Modular Multilevel Converters in Low Frequency Motor Drive Operation By Longya XU	[View] [Download]
Abstract: Errors of the high-frequency compensation circulating current are originally investigated for modular multilevel converters (MMCs) in low speed drive operation. The results reveal these errors causing serious energy unbalance in the MMC arms, resulting in a large submodule voltage fluctuation and unstable drive operation. A remedy approach is proposed to minimize the error effects.

	Highly integrated Synchronous Reluctance Motor Drive System with SiC-Mosfets By Boris JANJIC	[View] [Download]
Abstract: The design of a highly integrated synchronous reluctance motor drive system with SiC-Mosfets is presented. The motor-drive system has a power of 22 kW at 3000 /min rated speed. The power electronics is radially integrated on the motor housing. With the used modular splitting of power electronic an even distribution of the losses on the motor housing is possible. Due to the compact design and combine air cooling of motor and drive the volume of the drive system with new concept is reduced by 25 \% compared to the actual solution. In this paper the comparison between calculated and measured results is given.

	Input Admittance Model for the Sensorless Controlled Slim DC-link Drive By Yang FENG	[View] [Download]
Abstract: Sensorless control is an effective method to increase the overall system reliability in adjustable speed drive and reduce the cost for a slim dc-link drive. However such drive system may suffer from instability issue caused by the constant power load operation and also the reduced dc-link capacitance. In order to investigate this problem, the input admittance model of a sensorless controlled slim dc-link drive system is developed in this paper. The developed model can predict the system stability performance in a PMSM or SynRM drive system, and its effectiveness is verified by the simulations and experiments on a SynRM test bench.

	Operation of fault-tolerant inverters with DC-link midpoint connection for adjustable speed drives By Michael GLEISSNER	[View] [Download]
Abstract: Some fault-tolerant three-phase inverters are based upon a reconfiguration to an inverter with only two active phases and a DC-link midpoint connection after any semiconductor failure. Thus, the maximum output voltage is halved and the DC-link midpoint capacitor voltage ripple depends on output frequency and output current of the inverter. These limiting effects on the operation range of adjustable speed drives as well as software and hardware based countermeasures are presented in this paper.

	Speed Estimation in Induction Motors Using Additional Windings By Meryl Teresa JOY	[View] [Download]
Abstract: Induction motors are widely used in industrial and consumer applications by virtue of their ruggedness, reliability and low cost. Motion control methods of electrical motors such as vector control techniques require accurate position and speed signals fed to the controller. The conventional use of mechanical sensors for speed estimation in motor control makes it expensive and space consuming in applications that have limitations of space. Therefore, speed-sensorless methods for motor control have relevant scope in the industry. In this paper, a method for speed estimation of an induction motor using a few additional sensing windings within the stator is proposed. Rotor position information can be extracted from externally injected signals and from the induced voltages in these additional windings at different speeds and standstill. Tests have been conducted on an induction motor with the sensing windings wound on the stator. The signals measured from these windings are found to have effects from the rotation of the rotor due to slot harmonics. Results from finite element analysis and from the test bench measurements are discussed. The speed estimation is compared with the actual speed and the results show that this method promises efficient speed estimation in induction motors.