EPE Association: EPE 1987 - 06 - Lecture Session 1.06: CONVERTERS (II)

EPE 1987 - 06 - Lecture Session 1.06: CONVERTERS (II)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 06 - Lecture Session 1.06: CONVERTERS (II)

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   A SAMPLED DATA CURRENT CONTROLLER FOR A VOLTAGE SOURCE INVERTER
By D. S. Wijesundera; R. D. Jackson; M. H. Pong [View]
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Abstract: Algorithms for online current controllers for voltage source inverters in induction motor drives are becoming feasible with fast digital signal processing. This paper considers the implimentation of a digital current controller and examines the effects of various approximations in the algorithms on the response and accuracy of the controlled current. The effects of quantization errors on the quality of control are also discussed.

   COMMUTATION MODES AND A DESIGN CRITERION OF CURRENT SOURCE INVERTERS
By A. Bellini; D. Grimaldi; C. Picardi [View]
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Abstract: The usual design criteria of current source inverters only consider the most simple mode occurring during the commutation process. This leads to a considerable limitation of the value of the commutating capacitance and consequently to very high voltages applied on the power semiconductors. The paper considers further commutation modes characterized by overlapping phenomena and conductions of diodes which are reverse biased during the normal commutation mode. By this analysis it is possible to get a design criterion which, besides a substantial reduction of the peak values of the voltages applied on the inverter components, can involve a remarkable reduction of the inductance of the smoothing filter when the maximum operating frequency of the drive is rather high.

   HIGH VOLTAGE CONVERTERS - PROMISING TECHNOLOGICAL DEVELOPMENTS
By Jean-Marie Andrejak; Marc Lescure [View]
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Abstract: The in-series connection of power transistors makes it possible to envisage the direct use of these types of components on a medium-voltage network. The problems involved in in-series connection of power transistors are analyzed both from inverter and chopper branch points of view. A functional approach is used, making it possible to define a modular switch likely to facilltage in-series connection for all types of components (transistor, GTO, etc ... ). Various solutions are proposed and analyzed. An example involving a 200 kW, 4 kV-chopper is described. Thus, the use of GTOs for medium-voltage applications can be envisaged.

   New type of class D sinusoidal converter constructed with FETs
By E. Hebenstreit [View]
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Abstract: An experimental sinusoidal converter of class D, excited by a rectangular current, is presented. Devices of this type equipped with bipolar transistors require complex control systems. The circuit discussed here can dispense with these, is extremely simple and attains frequencies up to several MHz at an efficiency of 95%. lt is suitable for use in voltage converters and as a generator for induction heating.

   POWER PROCESSING BY MEANS OF CONTROLLED GYRATORS
By S. Singer [View]
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Abstract: The gyrator is a lossless two port network which transforms one port netwerk into its dual with respect to its gyration conductance. lts ability to transform voltage sources into a current source makes it suitable for the coupling of loads which exhibits voltage source characteristics such as electrical discharge devices. Novel realization method enables synthesis of a very efficient device. Power conversion systems based on controlled, time variable gyrators are discussed. The analyses includes the cases of bi-directional, harmonics free, dc/ac conversion, dc/dc conversion and Var generation.

EPE 1987 - 06 - Lecture Session 1.06: CONVERTERS (II)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 06 - Lecture Session 1.06: CONVERTERS (II)
	[return to parent folder]

	A SAMPLED DATA CURRENT CONTROLLER FOR A VOLTAGE SOURCE INVERTER By D. S. Wijesundera; R. D. Jackson; M. H. Pong	[View] [Download]
Abstract: Algorithms for online current controllers for voltage source inverters in induction motor drives are becoming feasible with fast digital signal processing. This paper considers the implimentation of a digital current controller and examines the effects of various approximations in the algorithms on the response and accuracy of the controlled current. The effects of quantization errors on the quality of control are also discussed.

	COMMUTATION MODES AND A DESIGN CRITERION OF CURRENT SOURCE INVERTERS By A. Bellini; D. Grimaldi; C. Picardi	[View] [Download]
Abstract: The usual design criteria of current source inverters only consider the most simple mode occurring during the commutation process. This leads to a considerable limitation of the value of the commutating capacitance and consequently to very high voltages applied on the power semiconductors. The paper considers further commutation modes characterized by overlapping phenomena and conductions of diodes which are reverse biased during the normal commutation mode. By this analysis it is possible to get a design criterion which, besides a substantial reduction of the peak values of the voltages applied on the inverter components, can involve a remarkable reduction of the inductance of the smoothing filter when the maximum operating frequency of the drive is rather high.

	HIGH VOLTAGE CONVERTERS - PROMISING TECHNOLOGICAL DEVELOPMENTS By Jean-Marie Andrejak; Marc Lescure	[View] [Download]
Abstract: The in-series connection of power transistors makes it possible to envisage the direct use of these types of components on a medium-voltage network. The problems involved in in-series connection of power transistors are analyzed both from inverter and chopper branch points of view. A functional approach is used, making it possible to define a modular switch likely to facilltage in-series connection for all types of components (transistor, GTO, etc ... ). Various solutions are proposed and analyzed. An example involving a 200 kW, 4 kV-chopper is described. Thus, the use of GTOs for medium-voltage applications can be envisaged.

	New type of class D sinusoidal converter constructed with FETs By E. Hebenstreit	[View] [Download]
Abstract: An experimental sinusoidal converter of class D, excited by a rectangular current, is presented. Devices of this type equipped with bipolar transistors require complex control systems. The circuit discussed here can dispense with these, is extremely simple and attains frequencies up to several MHz at an efficiency of 95%. lt is suitable for use in voltage converters and as a generator for induction heating.

	POWER PROCESSING BY MEANS OF CONTROLLED GYRATORS By S. Singer	[View] [Download]
Abstract: The gyrator is a lossless two port network which transforms one port netwerk into its dual with respect to its gyration conductance. lts ability to transform voltage sources into a current source makes it suitable for the coupling of loads which exhibits voltage source characteristics such as electrical discharge devices. Novel realization method enables synthesis of a very efficient device. Power conversion systems based on controlled, time variable gyrators are discussed. The analyses includes the cases of bi-directional, harmonics free, dc/ac conversion, dc/dc conversion and Var generation.