EPE Association: EPE 1997 – 57: Dialogue Session DS4h: ADAPTIVE ROBUST SLIDING MODES

EPE 1997 – 57: Dialogue Session DS4h: ADAPTIVE ROBUST SLIDING MODES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 57: Dialogue Session DS4h: ADAPTIVE ROBUST SLIDING MODES

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   QUASI -SLIDING MODE APROACH TO DIRECT VOLTAGE MODULATION FOR FREQUENCY-CONTROLLED VSI DRIVES
By V. Oleschuk [View]
[Download]

Abstract: Sliding principle of direct coding pulsewidth modulation of line-to-line voltage for voltage source drive converters has been presented and described. The methodology is based on smooth continuous variation of voltage due to programmed quasi-sliding control of special signals in waveform during the whole adjustment range. Control process is executed here under condition of identification of voltage pulse patterns with output frequency of the system and input voltage of inverter. Basic laws of modulation are described in this case by the simple closed-form algebraic correlations. It is possible to realize different combined algorithms of modulation both scalar and vector on the base of the methodology worked out. It has been given an example of typical control for power adjustable speed drive system consisting from starting mode control subrange and from rated control mode.

   DESIGNING MULTI-INPUT SLIDING MODE CONTROLLERS FOR QUANTUM RESONANT CONVERTERS USING THE LYAPUNOV-FUNCTION APPROACH
By M. Castilla; L. Garcia de Vicuna; M. Lopez; J. Matas [View]
[Download]

Abstract: A design method of sliding mode controllers for multi-input quantum resonant converters is developed. The control design procedure, based on Lyapunov's direct method, provides the structure of the switching surfaces and their associated control laws, guaranteeing global asymptotical stability. The method is applied to a quantum series resonant converter with two control inputs, and computer simulations verify theoretical assumptions in relation to system stability and robustness against external disturbances.

   SLIDING MODE CONTROLLERS FOR MULTILEVEL INVERTERS
By J. Fernando Silva; N. Caldeira; A. Machaieie [View]
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Abstract: A robust sliding mode on-line controller, suitable for the output voltage control of multilevel inverters with steady-state error elimination, is described. Capacitor voltage divider equalisation is also addressed using the same theory. Controller operation can be at variable or constant frequency, sampling only the output voltage. The design of all controller and modulator electronics for the power converter is integrated using a single theoretical approach. Presented simulation and experimental results show that the performance of the controller is independent of system parameters and load. Capacitor voltage divider drift is also completely eliminated.

   A ROBUST STATE FEEDBACK-BASED SERVO CONTROL SYSTEM USING MEASURABLE STATE VARIABLES IN RESONANT MOTOR DRIVES
By Kenji Hara; Seiji Hashimoto; Hirohito Funato; Kenzo Kamiyama [View]
[Download]

Abstract: Tills paper describes a robust state feedback-based servo control strategy for torsional vibration suppression in two-mass resonant motor drives only using measurable state variables without a state observer. Optimal feedback gains for the servo control system can be decided by taking into consideration stability condition and frequency response wave shaping. It also compares robust stability in position and speed control between state feedback-based control systems with and without a state observer.

   ON THE ROBUSTNESS OF SLIDING MODE CONTROLLERS FOR TWELVE PULSE PARALLEL RECTIFIERS
By S. Ferreira Pinto; J. Fernando Silva [View]
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Abstract: We evaluate the robustness of sliding mode controllers for twelve pulse parallel thyristor rectifiers with output double LC filters. Due to the natural commutated thyristors the sliding mode controller uses a constant frequency approach. In this paper the steady-state error problem is solved and the robustness of the resultant system is verified with simulation results. Experimental results are also discussed.

   SLIDING MODE CONTROL OF A CURRENT TYPE PWM RECTIFIER
By G. D. Marques; P. Verdelho [View]
[Download]

Abstract: This paper presents a control method for current type pulse width modulation (PWM) AC to DC converters. This method is based on a vectorial sliding mode approach and on a simple hysteresis modulator proposed recently. Three switching functions defined by a linear combination of the vectorial error and its derivative are used. The practical implementation of this system is easy leading to a simple controller structure. A comparison between hysteresis controller and the sliding mode controller is done showing great advantages on the proposed method.

EPE 1997 – 57: Dialogue Session DS4h: ADAPTIVE ROBUST SLIDING MODES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 57: Dialogue Session DS4h: ADAPTIVE ROBUST SLIDING MODES
	[return to parent folder]

	QUASI -SLIDING MODE APROACH TO DIRECT VOLTAGE MODULATION FOR FREQUENCY-CONTROLLED VSI DRIVES By V. Oleschuk	[View] [Download]
Abstract: Sliding principle of direct coding pulsewidth modulation of line-to-line voltage for voltage source drive converters has been presented and described. The methodology is based on smooth continuous variation of voltage due to programmed quasi-sliding control of special signals in waveform during the whole adjustment range. Control process is executed here under condition of identification of voltage pulse patterns with output frequency of the system and input voltage of inverter. Basic laws of modulation are described in this case by the simple closed-form algebraic correlations. It is possible to realize different combined algorithms of modulation both scalar and vector on the base of the methodology worked out. It has been given an example of typical control for power adjustable speed drive system consisting from starting mode control subrange and from rated control mode.

	DESIGNING MULTI-INPUT SLIDING MODE CONTROLLERS FOR QUANTUM RESONANT CONVERTERS USING THE LYAPUNOV-FUNCTION APPROACH By M. Castilla; L. Garcia de Vicuna; M. Lopez; J. Matas	[View] [Download]
Abstract: A design method of sliding mode controllers for multi-input quantum resonant converters is developed. The control design procedure, based on Lyapunov's direct method, provides the structure of the switching surfaces and their associated control laws, guaranteeing global asymptotical stability. The method is applied to a quantum series resonant converter with two control inputs, and computer simulations verify theoretical assumptions in relation to system stability and robustness against external disturbances.

	SLIDING MODE CONTROLLERS FOR MULTILEVEL INVERTERS By J. Fernando Silva; N. Caldeira; A. Machaieie	[View] [Download]
Abstract: A robust sliding mode on-line controller, suitable for the output voltage control of multilevel inverters with steady-state error elimination, is described. Capacitor voltage divider equalisation is also addressed using the same theory. Controller operation can be at variable or constant frequency, sampling only the output voltage. The design of all controller and modulator electronics for the power converter is integrated using a single theoretical approach. Presented simulation and experimental results show that the performance of the controller is independent of system parameters and load. Capacitor voltage divider drift is also completely eliminated.

	A ROBUST STATE FEEDBACK-BASED SERVO CONTROL SYSTEM USING MEASURABLE STATE VARIABLES IN RESONANT MOTOR DRIVES By Kenji Hara; Seiji Hashimoto; Hirohito Funato; Kenzo Kamiyama	[View] [Download]
Abstract: Tills paper describes a robust state feedback-based servo control strategy for torsional vibration suppression in two-mass resonant motor drives only using measurable state variables without a state observer. Optimal feedback gains for the servo control system can be decided by taking into consideration stability condition and frequency response wave shaping. It also compares robust stability in position and speed control between state feedback-based control systems with and without a state observer.

	ON THE ROBUSTNESS OF SLIDING MODE CONTROLLERS FOR TWELVE PULSE PARALLEL RECTIFIERS By S. Ferreira Pinto; J. Fernando Silva	[View] [Download]
Abstract: We evaluate the robustness of sliding mode controllers for twelve pulse parallel thyristor rectifiers with output double LC filters. Due to the natural commutated thyristors the sliding mode controller uses a constant frequency approach. In this paper the steady-state error problem is solved and the robustness of the resultant system is verified with simulation results. Experimental results are also discussed.

	SLIDING MODE CONTROL OF A CURRENT TYPE PWM RECTIFIER By G. D. Marques; P. Verdelho	[View] [Download]
Abstract: This paper presents a control method for current type pulse width modulation (PWM) AC to DC converters. This method is based on a vectorial sliding mode approach and on a simple hysteresis modulator proposed recently. Three switching functions defined by a linear combination of the vectorial error and its derivative are used. The practical implementation of this system is easy leading to a simple controller structure. A comparison between hysteresis controller and the sliding mode controller is done showing great advantages on the proposed method.