EPE Association: EPE 2014 - DS2f: Adjustable Speed Drives

EPE 2014 - DS2f: Adjustable Speed Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 04: Electrical Machines and Drive Systems > EPE 2014 - DS2f: Adjustable Speed Drives

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   A New Delay Compensation Method for Finite Control Set Model Predictive Control of Induction Motor Drives
By Sérgio CRUZ, Pedro GONÇALVES [View]
[Download]

Abstract: Finite control set model predictive control requires a considerable computational burden and it is inevitable to have a time delay between the measurement and the actuation instants in an electric drive based on this control strategy. In this work, it is proposed a new method to compensate the calculation delays in an induction motor drive using predictive control. This new compensation method takes advantage of synchronized sampling to measure the motor supply current signals with less high-frequency ripple, while the actuation signals are only applied in the middle of the next sampling period. Experimental results confirm the validity and superiority of the proposed approach, achieving a better performance for the drive, both in steady-state and dynamic conditions.

   Control strategy of a dual-inverter system for an open-end winding induction machine based on indirect matrix converter
By Javier RIEDEMANN, Rubén PEÑA, Roberto CARDENAS, Jon CLARE, Patrick WHEELER, Ramón BLASCO-GIMENEZ [View]
[Download]

Abstract: A strategy for an indirect matrix converter with two outputs to supply energy to a vector controlledopen-end winding induction machine is presented. The modulation schemes for the input and twooutput stages aim to reduce the virtual DC link voltage for low speed operation and eliminate the zerosequence voltage in the load.

   Enhanced torque control in a DFIG connected to a DC grid by a diode rectifier
By Matteo IACCHETTI, Gil MARQUES [View]
[Download]

Abstract: This paper considers the control of a doubly fed induction machine (DFIG) connected to a dc-bus ordc-grid by using a diode rectifier placed on the stator-side and a single PWM converter on the rotor. Inthis system, the torque and the frequency have to be regulated simultaneously, in order to make theprime mover operating at the maximum power point and to guarantee at the same time a flux levelnear the rated value. Since this system is based on a unique reduced-power controlled converter and adiode rectifier, a noticeable reduction of the costs of the power electronics can be achieved. However,the diode bridge causes stator current and voltage harmonics which produce a noticeable torque ripple.A regulation scheme able to reduce the torque ripple is proposed in this paper: resonant currentcontrollers are implemented to track the sixth harmonic components in the reference rotor currentcommands, in such a way to kill the corresponding harmonic in the electromagnetic torque.

   Five-level inverter with a neutral point connection and a flying capacitor
By Juhamatti KORHONEN, Arto SANKALA, Andreas DOKTAR, Juha-Pekka STRÖM, Pertti SILVENTOINEN [View]
[Download]

Abstract: Multilevel inverters have become a well proven technology in medium voltage drives, especially due to their improved power quality. This paper presents a new five-level inverter topology that is based on a neutral point connection and a flying capacitor. The operation of the topology is presented, taking into account the balancing of the flying capacitors. The performance of the topology is demonstrated with simulations, and compared with five-level active neutral point clamped inverter.

   Losses in VSI-PWM fed axial flux machines
By Hendrik VANSOMPEL, Peter SERGEANT, Alex VAN DEN BOSSCHE, Luc DUPRE [View]
[Download]

Abstract: The goal of this paper is to study the additional loss caused by Pulse Width Modulation (PWM), on the one hand in an axial flux permanent magnet synchronous machine (PMSM), and on the other hand in the voltage source inverter (VSI) that supplies the machine. Via a computationally efficient technique, the losses are computed in the stator iron and in the magnets of the axial flux PMSM with PWM supply. In addition, the switching losses of the converter are estimated as a function of the PWM frequency. The losses are evaluated in both the machine and the power electronic converter for several PWM frequencies, for several stator currents and for different magnet segmentations. It is observed that with unsegmented magnets, a high PWM frequency results in much lower total losses of the drive than a low PWM frequency. With segmented magnets, the influence of the PWM frequency on the losses of the drive is much smaller. Only in overload conditions, at twice the rated stator current, the lowest considered PWM frequency results in the lowest losses.

   Minimizing Losses of a Synchronous Reluctance Motor Drive Taking into Account Core Losses and Magnetic Saturation
By Zengcai QU, Toni TUOVINEN, Marko HINKKANEN [View]
[Download]

Abstract: This paper proposes a loss-minimizing controller for synchronous reluctance motor drives. The proposed method takes core losses and magnetic saturation effects into account. The core-loss model consists of hysteresis losses and eddy-current losses. Magnetic saturation is modeled using two-dimensional power functions considering cross coupling between the d- and q-axes. The efficiency optimal d-axis current is calculated offline using the loss model and motor parameters. Instead of generating a look-up table, an approximate function was fitted to the loss-minimizing results. The loss-minimizing method is applied in a motion-sensorless drive and the results are validated by measurements.

   Sources and Mitigation of Inter-Harmonics in Back-To-Back Controllable Drives
By Hamid SOLTANI, Poh Chiang LOH, Frede BLAABJERG, Firuz ZARE [View]
[Download]

Abstract: The theme here is to identify the sources of interharmonics that can affect back-to-back controllabledrives and make non-characteristic interharmonic components in the grid side currents when the motorcurrents are unbalanced. A new control methodology then is formulated and proposed to compensate forthe sources, leading to undistorted grid currents, which are growingly important as more drives are tiedto the grid. It is shown that in the case of back-to-back controllable drives it is possible to reduce theinput current interharmonic distortion caused by motor current imbalance.

   The software-hardware simulator of the electric drive
By Anatoliy ZIUZEV, Konstantin NESTEROV, Mikhail MUDROV [View]
[Download]

Abstract: The simulator of power part of electric drive is under consideration in the paper. It is based on the software and hardware of National Instruments Company and includes model of converter and motor. The simulator is designed to setting up the electric drive and to explore the modes of its operation.

EPE 2014 - DS2f: Adjustable Speed Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2014 ECCE Europe - Conference > EPE 2014 - Topic 04: Electrical Machines and Drive Systems > EPE 2014 - DS2f: Adjustable Speed Drives
	[return to parent folder]

	A New Delay Compensation Method for Finite Control Set Model Predictive Control of Induction Motor Drives By Sérgio CRUZ, Pedro GONÇALVES	[View] [Download]
Abstract: Finite control set model predictive control requires a considerable computational burden and it is inevitable to have a time delay between the measurement and the actuation instants in an electric drive based on this control strategy. In this work, it is proposed a new method to compensate the calculation delays in an induction motor drive using predictive control. This new compensation method takes advantage of synchronized sampling to measure the motor supply current signals with less high-frequency ripple, while the actuation signals are only applied in the middle of the next sampling period. Experimental results confirm the validity and superiority of the proposed approach, achieving a better performance for the drive, both in steady-state and dynamic conditions.

	Control strategy of a dual-inverter system for an open-end winding induction machine based on indirect matrix converter By Javier RIEDEMANN, Rubén PEÑA, Roberto CARDENAS, Jon CLARE, Patrick WHEELER, Ramón BLASCO-GIMENEZ	[View] [Download]
Abstract: A strategy for an indirect matrix converter with two outputs to supply energy to a vector controlledopen-end winding induction machine is presented. The modulation schemes for the input and twooutput stages aim to reduce the virtual DC link voltage for low speed operation and eliminate the zerosequence voltage in the load.

	Enhanced torque control in a DFIG connected to a DC grid by a diode rectifier By Matteo IACCHETTI, Gil MARQUES	[View] [Download]
Abstract: This paper considers the control of a doubly fed induction machine (DFIG) connected to a dc-bus ordc-grid by using a diode rectifier placed on the stator-side and a single PWM converter on the rotor. Inthis system, the torque and the frequency have to be regulated simultaneously, in order to make theprime mover operating at the maximum power point and to guarantee at the same time a flux levelnear the rated value. Since this system is based on a unique reduced-power controlled converter and adiode rectifier, a noticeable reduction of the costs of the power electronics can be achieved. However,the diode bridge causes stator current and voltage harmonics which produce a noticeable torque ripple.A regulation scheme able to reduce the torque ripple is proposed in this paper: resonant currentcontrollers are implemented to track the sixth harmonic components in the reference rotor currentcommands, in such a way to kill the corresponding harmonic in the electromagnetic torque.

	Five-level inverter with a neutral point connection and a flying capacitor By Juhamatti KORHONEN, Arto SANKALA, Andreas DOKTAR, Juha-Pekka STRÖM, Pertti SILVENTOINEN	[View] [Download]
Abstract: Multilevel inverters have become a well proven technology in medium voltage drives, especially due to their improved power quality. This paper presents a new five-level inverter topology that is based on a neutral point connection and a flying capacitor. The operation of the topology is presented, taking into account the balancing of the flying capacitors. The performance of the topology is demonstrated with simulations, and compared with five-level active neutral point clamped inverter.

	Losses in VSI-PWM fed axial flux machines By Hendrik VANSOMPEL, Peter SERGEANT, Alex VAN DEN BOSSCHE, Luc DUPRE	[View] [Download]
Abstract: The goal of this paper is to study the additional loss caused by Pulse Width Modulation (PWM), on the one hand in an axial flux permanent magnet synchronous machine (PMSM), and on the other hand in the voltage source inverter (VSI) that supplies the machine. Via a computationally efficient technique, the losses are computed in the stator iron and in the magnets of the axial flux PMSM with PWM supply. In addition, the switching losses of the converter are estimated as a function of the PWM frequency. The losses are evaluated in both the machine and the power electronic converter for several PWM frequencies, for several stator currents and for different magnet segmentations. It is observed that with unsegmented magnets, a high PWM frequency results in much lower total losses of the drive than a low PWM frequency. With segmented magnets, the influence of the PWM frequency on the losses of the drive is much smaller. Only in overload conditions, at twice the rated stator current, the lowest considered PWM frequency results in the lowest losses.

	Minimizing Losses of a Synchronous Reluctance Motor Drive Taking into Account Core Losses and Magnetic Saturation By Zengcai QU, Toni TUOVINEN, Marko HINKKANEN	[View] [Download]
Abstract: This paper proposes a loss-minimizing controller for synchronous reluctance motor drives. The proposed method takes core losses and magnetic saturation effects into account. The core-loss model consists of hysteresis losses and eddy-current losses. Magnetic saturation is modeled using two-dimensional power functions considering cross coupling between the d- and q-axes. The efficiency optimal d-axis current is calculated offline using the loss model and motor parameters. Instead of generating a look-up table, an approximate function was fitted to the loss-minimizing results. The loss-minimizing method is applied in a motion-sensorless drive and the results are validated by measurements.

	Sources and Mitigation of Inter-Harmonics in Back-To-Back Controllable Drives By Hamid SOLTANI, Poh Chiang LOH, Frede BLAABJERG, Firuz ZARE	[View] [Download]
Abstract: The theme here is to identify the sources of interharmonics that can affect back-to-back controllabledrives and make non-characteristic interharmonic components in the grid side currents when the motorcurrents are unbalanced. A new control methodology then is formulated and proposed to compensate forthe sources, leading to undistorted grid currents, which are growingly important as more drives are tiedto the grid. It is shown that in the case of back-to-back controllable drives it is possible to reduce theinput current interharmonic distortion caused by motor current imbalance.

	The software-hardware simulator of the electric drive By Anatoliy ZIUZEV, Konstantin NESTEROV, Mikhail MUDROV	[View] [Download]
Abstract: The simulator of power part of electric drive is under consideration in the paper. It is based on the software and hardware of National Instruments Company and includes model of converter and motor. The simulator is designed to setting up the electric drive and to explore the modes of its operation.