EPE Association: EPE 2007 - Subtopic 07-4 - DS: Application of control methods to electrical systems

EPE 2007 - Subtopic 07-4 - DS: Application of control methods to electrical systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 07: 'Application of control methods to electrical systems' > EPE 2007 - Subtopic 07-4 - DS: Application of control methods to electrical systems

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   Adaptive backstepping control of a completely unknown permanent magnet motor
By KABZIŃSKI Jacek [View]
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Abstract: We consider adaptive backstepping (AB) control of an interior permanent magnet (IPM) motor. We propose to use artificial neural networks, or neuro-fuzzy models to approximate unknown nonlinear functions in each stage of the backstepping procedure. In this case no regression matrix need to be found and "liner-in-the-parameter" assumption is not necessary. The last layer coefficients of the neural network are modified on-line by the differential adaptive law. We demonstrate that adaptive backstepping technique is able to control properly a completely unknown IPM machine.

   Analysis of a DSP-system in order to flexibly control a switch mode power supply
By SCHMID Markus; KUEBRICH Daniel; DUERBAUM Thomas [View]
[Download]

Abstract: This paper investigates a DSP-platform for the purpose to control a switch mode power supply digitally. As the PWM module and the A/D-converter are the interfaces of the digital controller to the analog power supply, both modules will be examined with regard to their performance but also to possible sources of errors. As occurring delay times in the digital controller will have an effect on the stability, the delay times will be calculated and verified by small signal measurements.

   Control System Simulation of a 40 kW Half-Bridge Isolated DC-DC Converter
By ROASTO Indrek [View]
[Download]

Abstract: This paper presents a control methodology of a new 40 kW half-bridge isolated DC/DC converter. Different control methodologies (voltage-mode and current-mode) are compared to choose the most feasible solution for that application. Simulation results are verified with an experimental prototype.

   Design and implementation of a fuzzy controller for wind generators performance optimisation
By SIANO Pierluigi; GALDI Vincenzo; PICCOLO Antonio; CALDERARO Vito [View]
[Download]

Abstract: Actual wind power costs together with incentives and financing options for developing renewable energy facilities make wind energy source competitive with conventional generation sources and it is believed that wind energy will be the most cost effective source of electrical power in the next future. However, the wind power production diffusion involves the development of efficient control systems able to improve wind systems effectiveness. Therefore, a design methodology, able to generate an adaptive fuzzy model for maximum energy extraction from variable speed wind turbines is proposed in this paper. The fuzzy model is designed by using fuzzy clustering combined with genetic algorithms (GA) and recursive leastsquares (LS) optimisation methods. Some simulation results on a doubly-fed induction generator confirmed that the proposed design methodology is able to identify a Takagi-Sugeno-Kang (TSK) fuzzy model exhibiting adaptivity, learning capability, high speed of computation and low memory occupancy.

   Emulator for a DC-Machine, Working as an Actuator in a Torque Split Unit of an All-Wheel Driven Automobile
By SCHUSTER Thomas; KRISCHAN Klaus; SEEBACHER Roland R.; DANNERER GÃ¼nther [View]
[Download]

Abstract: The aim of the constructed emulator system, in association with a mathematical simulation model of an actuator running on a digital-signal-processor-HIL system (Hardware-in-the-Loop system) is to replace a real actuator and its positioning sensors. The emulator is the physical link between the real actuator supply electronics and the mathematical actuator model. From the (electrical) view of the power supply or power electronics controlling an actuator it makes no difference whether a real actuator or the emulation system is connected. This enables actuator system designers to quickly change drive parameters and check their effects on control electronics to speed up electronics and actuator design processes. Another possibility is to check control electronics under special actuator conditions which may result in destroying a real actuator. The main part of the emulator is a controllable voltage source in order to emulate the inducted armature voltage of the actuator. This electronic source and load unit consists of two pulse width modulation amplifiers working as buck converters. The armature resistance and inductance are emulated by physical parts. Furthermore, the position signals generated by the signal-processor-HIL system are electrically isolated and used for emulating the position sensor signals.

   Injecting position dependent currents in order to reduce oscillations caused by the gearbox of a dc-motor drive
By SEEBACHER Roland R.; DANNERER Guenther; KRISCHAN Klaus [View]
[Download]

Abstract: An electrical drive consisting of a pwm-fed, digital-signal-processor controlled dc-motor, of a gearbox and the load is investigated. The gearbox features a high gear transmission ratio and converts the rotation of the dc-motor into a vertical translatory movement. Due to construction insufficiencies the gearbox causes torque disturbances, which influence the vertical acceleration. The underlying idea is to compensate the torque disturbances by position dependent control of the armature current. The appropriate phases and amplitudes of the currents are calculated using the signal derived from an acceleration sensor and the extrapolated angular rotor position information. Experimental results clearly show that it is possible to reduce the oscillations by improving the control algorithm of the drive. The mechanical system acts in a sufficiently linear manner; the dc-machine's nonlinearity due to slotting has only a minor effect.

   ROBUST SPEED AND POSITION CONTROL BASED ON NEURO AND FUZZY TECHNIQUES
By PAJCHROWSKI Tomasz; ZAWIRSKI Krzysztof [View]
[Download]

Abstract: The paper deals with the problem of robust speed and position control of electrical servo-drives. A robust speed controller is developed using a non-linear PI controller. The controller's non-linear characteristic is obtained by applying computational intelligence methods such as fuzzy logic or neuro techniques. Simulations and laboratory results validate the robustness of a servo-drive with a PMSM

   Rotor Time Constant Adaptation with ANN Application
By BRANDSTETTER Pavel; SKUTA Ondrej; CAJKA Radim [View]
[Download]

Abstract: In the paper there are presented results of method for rotor time constant adaptation with application of artificial neural network. The method employs the model reference adaptive system (MRAS). The adaptation algorithm is designed according to the Popov's criterion for hyperstability. The method is based on application of current model and voltage model of rotor flux in MRAS. The estimation of rotor time constant for adaptive model of MRAS is realized by the help of PI-controller. In next part of the paper there is described a replacement of adaptation algorithm in MRAS by the help of artificial neural network. The estimated rotor time constant is necessary for so-called current model. The current model is used in the vector control of the induction motor and serves for the determination of the quantities for the transformation from stationary reference frame into reference frame which is oriented on the rotor flux space vector. Simulations have been performed in the Matlab-Simulink. The control algorithms are implemented using TMS320C2812 DSP. At the end of the paper some simulation and experimental results are provided to demonstrate the effectiveness of proposed method.

   WIDE-BAND POWER ELECTRONICS CURRENT SOURCEFOR REFERENCE PURPOSES
By GWOZDZ Michal; PORADA Ryszard [View]
[Download]

Abstract: In the paper one of control methods of electrical systems is presented. In this particular case the electrical system has been precision wide-band power electronics current source. This source has been fundamental part of flexible Reference Current Generator for testing of energy meters and other laboratory purposes. The control module of Generator utilizes floating point DSP microcomputer for power electronics applications. This module controls directly H-bridge, IPM based, power electronics inverter with passive low-pass filter at the output. This type of controlled current source is able to generate current, that shape strictly responds the reference signal waveform. Following parts of the paper describes: structure, control algorithms and investigations results of laboratory model of Generator.

EPE 2007 - Subtopic 07-4 - DS: Application of control methods to electrical systems
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2007 - Conference > EPE 2007 - Topic 07: 'Application of control methods to electrical systems' > EPE 2007 - Subtopic 07-4 - DS: Application of control methods to electrical systems
	[return to parent folder]

	Adaptive backstepping control of a completely unknown permanent magnet motor By KABZIŃSKI Jacek	[View] [Download]
Abstract: We consider adaptive backstepping (AB) control of an interior permanent magnet (IPM) motor. We propose to use artificial neural networks, or neuro-fuzzy models to approximate unknown nonlinear functions in each stage of the backstepping procedure. In this case no regression matrix need to be found and "liner-in-the-parameter" assumption is not necessary. The last layer coefficients of the neural network are modified on-line by the differential adaptive law. We demonstrate that adaptive backstepping technique is able to control properly a completely unknown IPM machine.

	Analysis of a DSP-system in order to flexibly control a switch mode power supply By SCHMID Markus; KUEBRICH Daniel; DUERBAUM Thomas	[View] [Download]
Abstract: This paper investigates a DSP-platform for the purpose to control a switch mode power supply digitally. As the PWM module and the A/D-converter are the interfaces of the digital controller to the analog power supply, both modules will be examined with regard to their performance but also to possible sources of errors. As occurring delay times in the digital controller will have an effect on the stability, the delay times will be calculated and verified by small signal measurements.

	Control System Simulation of a 40 kW Half-Bridge Isolated DC-DC Converter By ROASTO Indrek	[View] [Download]
Abstract: This paper presents a control methodology of a new 40 kW half-bridge isolated DC/DC converter. Different control methodologies (voltage-mode and current-mode) are compared to choose the most feasible solution for that application. Simulation results are verified with an experimental prototype.

	Design and implementation of a fuzzy controller for wind generators performance optimisation By SIANO Pierluigi; GALDI Vincenzo; PICCOLO Antonio; CALDERARO Vito	[View] [Download]
Abstract: Actual wind power costs together with incentives and financing options for developing renewable energy facilities make wind energy source competitive with conventional generation sources and it is believed that wind energy will be the most cost effective source of electrical power in the next future. However, the wind power production diffusion involves the development of efficient control systems able to improve wind systems effectiveness. Therefore, a design methodology, able to generate an adaptive fuzzy model for maximum energy extraction from variable speed wind turbines is proposed in this paper. The fuzzy model is designed by using fuzzy clustering combined with genetic algorithms (GA) and recursive leastsquares (LS) optimisation methods. Some simulation results on a doubly-fed induction generator confirmed that the proposed design methodology is able to identify a Takagi-Sugeno-Kang (TSK) fuzzy model exhibiting adaptivity, learning capability, high speed of computation and low memory occupancy.

	Emulator for a DC-Machine, Working as an Actuator in a Torque Split Unit of an All-Wheel Driven Automobile By SCHUSTER Thomas; KRISCHAN Klaus; SEEBACHER Roland R.; DANNERER GÃ¼nther	[View] [Download]
Abstract: The aim of the constructed emulator system, in association with a mathematical simulation model of an actuator running on a digital-signal-processor-HIL system (Hardware-in-the-Loop system) is to replace a real actuator and its positioning sensors. The emulator is the physical link between the real actuator supply electronics and the mathematical actuator model. From the (electrical) view of the power supply or power electronics controlling an actuator it makes no difference whether a real actuator or the emulation system is connected. This enables actuator system designers to quickly change drive parameters and check their effects on control electronics to speed up electronics and actuator design processes. Another possibility is to check control electronics under special actuator conditions which may result in destroying a real actuator. The main part of the emulator is a controllable voltage source in order to emulate the inducted armature voltage of the actuator. This electronic source and load unit consists of two pulse width modulation amplifiers working as buck converters. The armature resistance and inductance are emulated by physical parts. Furthermore, the position signals generated by the signal-processor-HIL system are electrically isolated and used for emulating the position sensor signals.

	Injecting position dependent currents in order to reduce oscillations caused by the gearbox of a dc-motor drive By SEEBACHER Roland R.; DANNERER Guenther; KRISCHAN Klaus	[View] [Download]
Abstract: An electrical drive consisting of a pwm-fed, digital-signal-processor controlled dc-motor, of a gearbox and the load is investigated. The gearbox features a high gear transmission ratio and converts the rotation of the dc-motor into a vertical translatory movement. Due to construction insufficiencies the gearbox causes torque disturbances, which influence the vertical acceleration. The underlying idea is to compensate the torque disturbances by position dependent control of the armature current. The appropriate phases and amplitudes of the currents are calculated using the signal derived from an acceleration sensor and the extrapolated angular rotor position information. Experimental results clearly show that it is possible to reduce the oscillations by improving the control algorithm of the drive. The mechanical system acts in a sufficiently linear manner; the dc-machine's nonlinearity due to slotting has only a minor effect.

	ROBUST SPEED AND POSITION CONTROL BASED ON NEURO AND FUZZY TECHNIQUES By PAJCHROWSKI Tomasz; ZAWIRSKI Krzysztof	[View] [Download]
Abstract: The paper deals with the problem of robust speed and position control of electrical servo-drives. A robust speed controller is developed using a non-linear PI controller. The controller's non-linear characteristic is obtained by applying computational intelligence methods such as fuzzy logic or neuro techniques. Simulations and laboratory results validate the robustness of a servo-drive with a PMSM

	Rotor Time Constant Adaptation with ANN Application By BRANDSTETTER Pavel; SKUTA Ondrej; CAJKA Radim	[View] [Download]
Abstract: In the paper there are presented results of method for rotor time constant adaptation with application of artificial neural network. The method employs the model reference adaptive system (MRAS). The adaptation algorithm is designed according to the Popov's criterion for hyperstability. The method is based on application of current model and voltage model of rotor flux in MRAS. The estimation of rotor time constant for adaptive model of MRAS is realized by the help of PI-controller. In next part of the paper there is described a replacement of adaptation algorithm in MRAS by the help of artificial neural network. The estimated rotor time constant is necessary for so-called current model. The current model is used in the vector control of the induction motor and serves for the determination of the quantities for the transformation from stationary reference frame into reference frame which is oriented on the rotor flux space vector. Simulations have been performed in the Matlab-Simulink. The control algorithms are implemented using TMS320C2812 DSP. At the end of the paper some simulation and experimental results are provided to demonstrate the effectiveness of proposed method.

	WIDE-BAND POWER ELECTRONICS CURRENT SOURCEFOR REFERENCE PURPOSES By GWOZDZ Michal; PORADA Ryszard	[View] [Download]
Abstract: In the paper one of control methods of electrical systems is presented. In this particular case the electrical system has been precision wide-band power electronics current source. This source has been fundamental part of flexible Reference Current Generator for testing of energy meters and other laboratory purposes. The control module of Generator utilizes floating point DSP microcomputer for power electronics applications. This module controls directly H-bridge, IPM based, power electronics inverter with passive low-pass filter at the output. This type of controlled current source is able to generate current, that shape strictly responds the reference signal waveform. Following parts of the paper describes: structure, control algorithms and investigations results of laboratory model of Generator.