EPE Association: EPE 2005 - Topic 10-3 - DS: Adjustable speed drives

EPE 2005 - Topic 10-3 - DS: Adjustable speed drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 10: ADJUSTABLE SPEED DRIVES > EPE 2005 - Topic 10-3 - DS: Adjustable speed drives

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   Active Front End Adjustable Speed Drives Under Grid Voltage Sags: Effects and Dynamical Performance Evaluation
By DELLAQUILA Antonio; LISERRE Marco; MONOPOLI Vito Giuseppe [View]
[Download]

Abstract: In this paper an evaluation of voltage sags effects on active front end adjustable speed drives (ASD’s) performance has been carried out. The operation of such devices is affected by several disturbances that can occur on the electrical grid. According to a number of surveys on power quality, voltage sags represent the main cause of disturbances which effects are even more evident than the ones related to harmonics. Therefore, the behavior and the dynamical performances of Field-Orientated and Direct Torque Control drives under grid symmetrical voltage sags are investigated and simulation as well as experimental results are presented. This kind of analysis provides useful advices for future work on how drive control technique can be modified and implemented in order to fulfill some important requirements above all on speed regulation and grid currents.

   COMPARISON OF THE MODIFIED SUBSYNCHRONOUS CASCADE DRIVES
By JAROCHA Robert W. [View]
[Download]

Abstract: Slip energy recovery induction motor drives, in which the variable speed operation is achieved by means of controlling the slip power, are used in high-power applications. The paper presents the results of simulation and experimental tests of the modified subsynchronous cascade system - thyristor converter in the rotor circuit was replaced with a DC/DC converter and PWM inverter with sinusoidal output current and unity power factor. A comparative analysis of the proposed solution has been carried out with reference to the basic cascade configuration with the thyristor converter functioning as a line inverter. The criteria of assessment were: rms values of line currents and current distortion factors in selected points of the cascade system.

   Control structures for Multi-machine Multi-converter Systems with several couplings
By RAZYK H.; MEIBOD; PIETRZA; MONMASSON E.; BENKHORIS M.; DELARUE P.; SEMAIL E.; BOUSCAYROL Alain; DE FORNEL Bernard [View]
[Download]

Abstract: A multimachine multi converter systemformalism has been proposed in order to describe systems of several elctrical machines and converters. The keys of such systems are coupling devices, which have to distribute energy.Control structures have also been suggested according to an inversion principle. The inversions of coupling devices have been made using repartition and weighting criteria. In this paper, systems with several couplings are studied. Several control structures can be found. One of them leads to shift some control blocks and to merge the repartition and weighting blocks. A railway traction system is given as example.

   Controlling voltage source converters with minimal energy storage
By MUTSCHLER Peter; LAMSAHEL Hassan [View]
[Download]

Abstract: A predictive control method for the DC-link voltage of a Voltage Source Converter (VSC) with active front end and minimal DC-link capacitor is proposed. The DC-Link voltage is controlled by a state controller using a feed forward signal from the machine controller. The load machine is controlled with the field-oriented controller. By dynamic transient (sudden load change or line disturbance…) the linear controllers cannot keep fast the dc-link voltage inside a tolerable range. An additional predictive controller has been developed. It comes into operation when in the next modulation interval the predicted DC-Link voltage would exceed its limits. Simulation and experimental results demonstrate the feasibility of the proposed method.

   DOUBLY FED INDUCTION GENERATOR WITH ACTIVE FILTERING FUNCTION FOR WIND ENERGY CONVERSION SYSTEMS
By BOUAOUICHE Toufik; MACHMOUM Mohamed; POITIERS FreDeRic [View]
[Download]

Abstract: To days doubly fed induction generator are more and more used in wind farms, there exist several interaction between the network and these farms, power quality and grid integration are the most problem, in this paper a doubly-fed induction generator with active filtering function for wind energy conversion systems is proposed. A vector control of the machine side converter is realised in order to assure simultaneously decoupled control of the stator active and reactive powers and the compensation of current harmonics due to non-linear load connected on the utility line.

   Generation of High Frequency Common Mode Currents in Machines of Inverter-Based Drive Systems
By MUETZE Annette; BINDER Andreas [View]
[Download]

Abstract: The additional HF (High Frequency) common mode current of inverter-based drive systems can cause pa-rasitic effects such as HF bearing currents and wide band EMI (Electro-Magnetic Interference). This pa-per presents a straightforward approach to prediction of the HF common mode current based on the dvLg/dt at the motor terminals. Only design parameters of the machine are used. No additional measurements are required. The HF common mode current generation is described by a distributed-parameter network. This model allows anticipation of the HF common mode current in order to better predict possible parasitic effects. For a given frame size, the number of parallel winding branches has a strong influence on the amplitude of the HF common mode current.

   Method of poles position identification for brushless axial flux permanent magnet motor drive system
By HEUER Hans; BUDIG Pete [View]
[Download]

Abstract: There is an increasing demand to control elctrical drives -with revolving or linear motors as well- with minimized jerk during dynamic operation modes. Jerk is defined by the third deviation of way above time. To avoid- or better to decrease - jerk during accelleration and decelleration periods means a loss of acceleration which must be compensated in that periods of the time-way diagramm in which the acceleration is constant. That means in that time- element the acceleration must be increased to be able to realize the time- way diagram within a given time- window. For the design of the electrical machine now there is besides the well known features like temperature rise, insulation class and rated torque a new quantity- The increase of the maximum torque to ensure that the time for a cycle of motion does not exceed a given frame.

   Optimum use of DC bus by fitting the back-electromotive force of a 7-phase Permanent Magnet Synchronous machine
By LOCMENT Fabrice; KESTELYN Xavier; SEMAIL Eric [View]
[Download]

Abstract: This paper deals with design constraints of a 7-phase Permanent Magnet Synchronous Machine (PMSM) supplied by a 7-leg Voltage Source Inverter. The optimum back electromotive force waveform is determined in order to get maximum torque for a given DC bus voltage.

   STABILIZATION OF AN INDUCTION MOTOR DRIVE WITH RESONANT INPUT FILTER
By MOSSKULL Henrik [View]
[Download]

Abstract: A model based controller is derived to stabilize a DC fed induction motor drive, with resonant input filter. By using a linearized feedback representation of the drive, it is shown how performance specifications can be translated into requirements on the input admittance of the voltage source inverter. This way the stabilization problem is reformulated as a loop-shaping problem, where the inverter input admittance should be given desired properties. In order to shape the inverter input admittance, the torque producing current reference is modified by the DC-link voltage via a stabilization controller. A general expression for this controller is derived in terms of the desired inverter input admittance. The analysis shows that stabilization may be needed also at operating points with zero power. Finally, an explicit expression for a stabilization controller that gives a good compromise between damping and disturbance rejection, but also is tractable from an implementation point of view, is proposed.

   Test-Bench for Ultra High-Speed Electrical Drives
By HILDEBRAND Rainer; HOFMANN Harald; JUNGNICKEL Kathrin; LANGE Benno; PYC Marcin; GERLING Dieter [View]
[Download]

Abstract: In this paper, a test-bench for electrical drives with ultra high-speeds is described. The components of this test-bench are explained and the respective characteristics are given. The entire system shows a capability of 140 000 rpm, 30 Nm and 39 kW.

   Unity Power Factor Control Method of Single-phase to Three-phase Power Converter Without Reactor and Electrolytic Capacitor
By HITOSHI Haga; KIYOSHI Ohishi; KAORU Sumida [View]
[Download]

Abstract: This paper proposes a new inverter drive system for an interior permanent magnet (IPM) synchronous motor and an inverter control method to obtain unity power factor of the single-phase diode rectifier without a reactor and an electrolytic capacitor. Source side energy provides directly to the motor without smoothing the dc-bus voltage. This paper describes that the proposed method achieves the power factor 98.8\% by experimental tests, and realizes the small size, low cost and long life inverter system.

   Jerk-Free Drives Demand for New Design Considerations
By Peter-Klaus Budig; Hans Heuer [View]
[Download]

Abstract: There is an increasing demand to control elctrical drives- with revolving or linear motors as well- with minimized jerk during dynamic operation modes. Jerk is defined by the third deviation of way above time. To avoid- or better to decrease - jerk during accelleration and decelleration periods means a loss of acceleration which must be compensated in that periods of the time-way diagramm in which the acceleration is constant. That means in that time- element the acceleration must be increased to be able to realize the time- way diagram within a given time- window. For the design of the electrical machine now there is besides the well known features like temperature rise, insulation class and rated torque a new quantity- The increase of the maximum torque to ensure that the time for a cycle of motion does not exceed a given frame.

EPE 2005 - Topic 10-3 - DS: Adjustable speed drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 10: ADJUSTABLE SPEED DRIVES > EPE 2005 - Topic 10-3 - DS: Adjustable speed drives
	[return to parent folder]

	Active Front End Adjustable Speed Drives Under Grid Voltage Sags: Effects and Dynamical Performance Evaluation By DELLAQUILA Antonio; LISERRE Marco; MONOPOLI Vito Giuseppe	[View] [Download]
Abstract: In this paper an evaluation of voltage sags effects on active front end adjustable speed drives (ASD’s) performance has been carried out. The operation of such devices is affected by several disturbances that can occur on the electrical grid. According to a number of surveys on power quality, voltage sags represent the main cause of disturbances which effects are even more evident than the ones related to harmonics. Therefore, the behavior and the dynamical performances of Field-Orientated and Direct Torque Control drives under grid symmetrical voltage sags are investigated and simulation as well as experimental results are presented. This kind of analysis provides useful advices for future work on how drive control technique can be modified and implemented in order to fulfill some important requirements above all on speed regulation and grid currents.

	COMPARISON OF THE MODIFIED SUBSYNCHRONOUS CASCADE DRIVES By JAROCHA Robert W.	[View] [Download]
Abstract: Slip energy recovery induction motor drives, in which the variable speed operation is achieved by means of controlling the slip power, are used in high-power applications. The paper presents the results of simulation and experimental tests of the modified subsynchronous cascade system - thyristor converter in the rotor circuit was replaced with a DC/DC converter and PWM inverter with sinusoidal output current and unity power factor. A comparative analysis of the proposed solution has been carried out with reference to the basic cascade configuration with the thyristor converter functioning as a line inverter. The criteria of assessment were: rms values of line currents and current distortion factors in selected points of the cascade system.

	Control structures for Multi-machine Multi-converter Systems with several couplings By RAZYK H.; MEIBOD; PIETRZA; MONMASSON E.; BENKHORIS M.; DELARUE P.; SEMAIL E.; BOUSCAYROL Alain; DE FORNEL Bernard	[View] [Download]
Abstract: A multimachine multi converter systemformalism has been proposed in order to describe systems of several elctrical machines and converters. The keys of such systems are coupling devices, which have to distribute energy.Control structures have also been suggested according to an inversion principle. The inversions of coupling devices have been made using repartition and weighting criteria. In this paper, systems with several couplings are studied. Several control structures can be found. One of them leads to shift some control blocks and to merge the repartition and weighting blocks. A railway traction system is given as example.

	Controlling voltage source converters with minimal energy storage By MUTSCHLER Peter; LAMSAHEL Hassan	[View] [Download]
Abstract: A predictive control method for the DC-link voltage of a Voltage Source Converter (VSC) with active front end and minimal DC-link capacitor is proposed. The DC-Link voltage is controlled by a state controller using a feed forward signal from the machine controller. The load machine is controlled with the field-oriented controller. By dynamic transient (sudden load change or line disturbance…) the linear controllers cannot keep fast the dc-link voltage inside a tolerable range. An additional predictive controller has been developed. It comes into operation when in the next modulation interval the predicted DC-Link voltage would exceed its limits. Simulation and experimental results demonstrate the feasibility of the proposed method.

	DOUBLY FED INDUCTION GENERATOR WITH ACTIVE FILTERING FUNCTION FOR WIND ENERGY CONVERSION SYSTEMS By BOUAOUICHE Toufik; MACHMOUM Mohamed; POITIERS FreDeRic	[View] [Download]
Abstract: To days doubly fed induction generator are more and more used in wind farms, there exist several interaction between the network and these farms, power quality and grid integration are the most problem, in this paper a doubly-fed induction generator with active filtering function for wind energy conversion systems is proposed. A vector control of the machine side converter is realised in order to assure simultaneously decoupled control of the stator active and reactive powers and the compensation of current harmonics due to non-linear load connected on the utility line.

	Generation of High Frequency Common Mode Currents in Machines of Inverter-Based Drive Systems By MUETZE Annette; BINDER Andreas	[View] [Download]
Abstract: The additional HF (High Frequency) common mode current of inverter-based drive systems can cause pa-rasitic effects such as HF bearing currents and wide band EMI (Electro-Magnetic Interference). This pa-per presents a straightforward approach to prediction of the HF common mode current based on the dvLg/dt at the motor terminals. Only design parameters of the machine are used. No additional measurements are required. The HF common mode current generation is described by a distributed-parameter network. This model allows anticipation of the HF common mode current in order to better predict possible parasitic effects. For a given frame size, the number of parallel winding branches has a strong influence on the amplitude of the HF common mode current.

	Method of poles position identification for brushless axial flux permanent magnet motor drive system By HEUER Hans; BUDIG Pete	[View] [Download]
Abstract: There is an increasing demand to control elctrical drives -with revolving or linear motors as well- with minimized jerk during dynamic operation modes. Jerk is defined by the third deviation of way above time. To avoid- or better to decrease - jerk during accelleration and decelleration periods means a loss of acceleration which must be compensated in that periods of the time-way diagramm in which the acceleration is constant. That means in that time- element the acceleration must be increased to be able to realize the time- way diagram within a given time- window. For the design of the electrical machine now there is besides the well known features like temperature rise, insulation class and rated torque a new quantity- The increase of the maximum torque to ensure that the time for a cycle of motion does not exceed a given frame.

	Optimum use of DC bus by fitting the back-electromotive force of a 7-phase Permanent Magnet Synchronous machine By LOCMENT Fabrice; KESTELYN Xavier; SEMAIL Eric	[View] [Download]
Abstract: This paper deals with design constraints of a 7-phase Permanent Magnet Synchronous Machine (PMSM) supplied by a 7-leg Voltage Source Inverter. The optimum back electromotive force waveform is determined in order to get maximum torque for a given DC bus voltage.

	STABILIZATION OF AN INDUCTION MOTOR DRIVE WITH RESONANT INPUT FILTER By MOSSKULL Henrik	[View] [Download]
Abstract: A model based controller is derived to stabilize a DC fed induction motor drive, with resonant input filter. By using a linearized feedback representation of the drive, it is shown how performance specifications can be translated into requirements on the input admittance of the voltage source inverter. This way the stabilization problem is reformulated as a loop-shaping problem, where the inverter input admittance should be given desired properties. In order to shape the inverter input admittance, the torque producing current reference is modified by the DC-link voltage via a stabilization controller. A general expression for this controller is derived in terms of the desired inverter input admittance. The analysis shows that stabilization may be needed also at operating points with zero power. Finally, an explicit expression for a stabilization controller that gives a good compromise between damping and disturbance rejection, but also is tractable from an implementation point of view, is proposed.

	Test-Bench for Ultra High-Speed Electrical Drives By HILDEBRAND Rainer; HOFMANN Harald; JUNGNICKEL Kathrin; LANGE Benno; PYC Marcin; GERLING Dieter	[View] [Download]
Abstract: In this paper, a test-bench for electrical drives with ultra high-speeds is described. The components of this test-bench are explained and the respective characteristics are given. The entire system shows a capability of 140 000 rpm, 30 Nm and 39 kW.

	Unity Power Factor Control Method of Single-phase to Three-phase Power Converter Without Reactor and Electrolytic Capacitor By HITOSHI Haga; KIYOSHI Ohishi; KAORU Sumida	[View] [Download]
Abstract: This paper proposes a new inverter drive system for an interior permanent magnet (IPM) synchronous motor and an inverter control method to obtain unity power factor of the single-phase diode rectifier without a reactor and an electrolytic capacitor. Source side energy provides directly to the motor without smoothing the dc-bus voltage. This paper describes that the proposed method achieves the power factor 98.8\% by experimental tests, and realizes the small size, low cost and long life inverter system.

	Jerk-Free Drives Demand for New Design Considerations By Peter-Klaus Budig; Hans Heuer	[View] [Download]
Abstract: There is an increasing demand to control elctrical drives- with revolving or linear motors as well- with minimized jerk during dynamic operation modes. Jerk is defined by the third deviation of way above time. To avoid- or better to decrease - jerk during accelleration and decelleration periods means a loss of acceleration which must be compensated in that periods of the time-way diagramm in which the acceleration is constant. That means in that time- element the acceleration must be increased to be able to realize the time- way diagram within a given time- window. For the design of the electrical machine now there is besides the well known features like temperature rise, insulation class and rated torque a new quantity- The increase of the maximum torque to ensure that the time for a cycle of motion does not exceed a given frame.