EPE Association: EPE 1995 - 22 - Lecture Session L6b: CONTROL (II)

EPE 1995 - 22 - Lecture Session L6b: CONTROL (II)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 22 - Lecture Session L6b: CONTROL (II)

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   A NEW HYBRID AC CURRENT LIMITING INTERRUPTING DEVICE FOR SEMICONDUCTOR CONVERTER PROTECTION
By J. Zyborski; T. Lipski; S. Hasan; J. Wittstock [View]
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Abstract: A new hybrid AC current limiting device (AC-HCLD) with replaceable contact, counter current injection circuit and electrodynamic drive is considered as a short circuit protection for diode rectifier and thyristor converter. The principle of operation and short circuit current limiting features of the AC-HCLD are described. It has been shown in the paper that a new approach to the short circuit protection of AC line commutated converter would be possible. lt is based on the fact that the Joule - Lenz integral I2t of the AC-HLCD let - through current is very small in comparison to the I2t of other current limiting devices and fuses. The 3- phase HCLD at the AC supply side could replace the commonly used individual fuse protection for semiconductor valves and protect the converter against internal faults. Operation of the HCLD protection at breaking internal fault currents in a 3- phase bridge thyristor converter is illustrated by voltage and current wave forms, obtained from computer simulation.

   CHARACTERISTICS OF ASYNCHRONOUS AND SYNCHRONOUS DISCRETE DELTA MODULATION FOR POWER INVERTERS
By S. Sathiakumar; S. Y .R. Hui; F. Pasalic [View]
[Download]

Abstract: This paper describes the characteristics of two discrete delta modulated (DOM) inverters, namely the Asynchronous (ADDM) scheme and the Synchronous (SDDM) inverters. The ADDM scheme operates with asynchronous switching frequency and generates harmonies that spread over a wide range of frequency. The SDDM scheme operates with constant switching frequency and generates harmonies at well defined frequencies that correspond to the switching frequency and its multiples. Both schemes have been implemented using a microprocessor based system and tested. Experimental results are presented. The advantages and disadvantages of both schemes are discussed.

   WHY AND HOW USING THE FUZZY LOGIC IN THE POWER ELECTRONICS FIELD
By A. Farjon; M. Tholomier [View]
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Abstract: In this paper, the authors consider the possibilities of a Fuzzy Logic approach for Electrical Engineering. Typical examples are given to point out the interest of such an approach for most applications fields of the Electrical Engineering. Method limitations and technical limitations are discussed.

   Dual Mode Optimal Time Control of DC Motors Using Neural Networks
By E. Galvan; J. M. Quero; L. G. Franquelo [View]
[Download]

Abstract: The electronic implementation of an optimal time control of DC drives is achieved using neural networks. The control law has been obtained by means of a fuzzy reasoning that combines optimal control for large position errors with PD control for small ones. The resulting control surface is learnt by a multilayer perceptron. Simulations results of the electronic implementation are given.

EPE 1995 - 22 - Lecture Session L6b: CONTROL (II)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 22 - Lecture Session L6b: CONTROL (II)
	[return to parent folder]

	A NEW HYBRID AC CURRENT LIMITING INTERRUPTING DEVICE FOR SEMICONDUCTOR CONVERTER PROTECTION By J. Zyborski; T. Lipski; S. Hasan; J. Wittstock	[View] [Download]
Abstract: A new hybrid AC current limiting device (AC-HCLD) with replaceable contact, counter current injection circuit and electrodynamic drive is considered as a short circuit protection for diode rectifier and thyristor converter. The principle of operation and short circuit current limiting features of the AC-HCLD are described. It has been shown in the paper that a new approach to the short circuit protection of AC line commutated converter would be possible. lt is based on the fact that the Joule - Lenz integral I2t of the AC-HLCD let - through current is very small in comparison to the I2t of other current limiting devices and fuses. The 3- phase HCLD at the AC supply side could replace the commonly used individual fuse protection for semiconductor valves and protect the converter against internal faults. Operation of the HCLD protection at breaking internal fault currents in a 3- phase bridge thyristor converter is illustrated by voltage and current wave forms, obtained from computer simulation.

	CHARACTERISTICS OF ASYNCHRONOUS AND SYNCHRONOUS DISCRETE DELTA MODULATION FOR POWER INVERTERS By S. Sathiakumar; S. Y .R. Hui; F. Pasalic	[View] [Download]
Abstract: This paper describes the characteristics of two discrete delta modulated (DOM) inverters, namely the Asynchronous (ADDM) scheme and the Synchronous (SDDM) inverters. The ADDM scheme operates with asynchronous switching frequency and generates harmonies that spread over a wide range of frequency. The SDDM scheme operates with constant switching frequency and generates harmonies at well defined frequencies that correspond to the switching frequency and its multiples. Both schemes have been implemented using a microprocessor based system and tested. Experimental results are presented. The advantages and disadvantages of both schemes are discussed.

	WHY AND HOW USING THE FUZZY LOGIC IN THE POWER ELECTRONICS FIELD By A. Farjon; M. Tholomier	[View] [Download]
Abstract: In this paper, the authors consider the possibilities of a Fuzzy Logic approach for Electrical Engineering. Typical examples are given to point out the interest of such an approach for most applications fields of the Electrical Engineering. Method limitations and technical limitations are discussed.

	Dual Mode Optimal Time Control of DC Motors Using Neural Networks By E. Galvan; J. M. Quero; L. G. Franquelo	[View] [Download]
Abstract: The electronic implementation of an optimal time control of DC drives is achieved using neural networks. The control law has been obtained by means of a fuzzy reasoning that combines optimal control for large position errors with PD control for small ones. The resulting control surface is learnt by a multilayer perceptron. Simulations results of the electronic implementation are given.