EPE Association: EPE 1993 - 20 - Lecture Session L7b: GENERATION AND TRANSMISSION: ACTIVE POWER FILTERS, HVDC

EPE 1993 - 20 - Lecture Session L7b: GENERATION AND TRANSMISSION: ACTIVE POWER FILTERS, HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 20 - Lecture Session L7b: GENERATION AND TRANSMISSION: ACTIVE POWER FILTERS, HVDC

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   HYBRID ACTIVE FILTER FOR PARALLEL HARMONIC COMPENSATION
By N. Balbo; D. Sella; R. Penzo; G. Bisiach; D. Cappellieri; L. Malesani; A. Zuccato [View]
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Abstract: The interest in the application of the active filters to the harmonic compensation increases with the rise of the pollution of the utility networks by distorting electronic loads. The high cost of these filters limited, up to now, their diffusion in the industrial applications. Acceptable results can be obtained by hybrid units, including passive filters networks associated with active units which integrate and control the passive filtering. The active section can be sized only at a fraction of the total compensating power rating. In the paper, the design criteria and the implementation of an industrial filter unit, intended to the compensation of medium-power distorting loads is described. The design criteria to obtain flexible and robust operation, good transient capability and insensitivity to the resonance conditions with the supply are outlined. The proportioning of the passive section is discussed. The filter control system, with some peculiar features, is detailed. The experimental performance, in comparison with the simulated behaviour, is reported.

   CONTROL METHOD AND CHARACTERISTICS OF ACTIVE POWER FILTERS
By S. Fukuda; T. Endoh [View]
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Abstract: This paper describes a control method with a combined filter system employing a current source converter and a high pass filter which senses load current, source current and line voltage to create reference signals for an active filter. The transfer function of the active filter is identified and is used for the control systen design. It is shown that the source current feedback is most effective to suppress the harmonic-enlarging effects due to parallel resonance and the harmonic current generated by source harmonic voltages. A small setup controlled by a DSP was built, and the validity of the proposed method was demonstrated by experimental results.

   HVDC SYSTEMS FAULT DIAGNOSIS WITH NEURAL NETWORKS
By L. L. Lai; F. Ndeh-Che; Tejedo Chari; P. J. Rajroop; H. S. Chandrasekharaiah [View]
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Abstract: This paper describes a neural network and its simulation results for fault diagnosis in HVDC systems. Fault diagnosis is carried out by mapping input data patterns, which represent the behaviour of the system, to one or more fault conditions. The behaviour of the converters is described in terms of the time varying patterns of conducting thyristors and AC & DC fault characteristics. A three- layer neural network consisting of 20 input nodes, 12 hidden nodes and 4 output nodes is used. 16 different faults have been considered and dynamic characteristics of networks for different configurations are studied too. The time performance of the network is also included. Neural networks provide an effective way for fault diagnosis.

   USING A THREE-LEVEL GTO VOLTAGE SOURCE INVERTER IN A HVDC TRANSMISSION SYSTEM
By G. Lipphardt [View]
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Abstract: Some aspects of the feasibility of three-level voltage source GTO inverters in HVDC applications are discussed. After presenting the converter topology a simplified point-to-point transmission with a conventional thyristor rectifier station and a three-level voltage source GTO inverter station is simulated using EMTP (ElectroMagnetic Transient Program). The static behaviour and some aspects of the dynamic behaviour of the transmission are shown. Problems and open questions to be solved in future are mentioned. The results show that the three-level voltage source inverter is a possible alternative for future use of forced commutated inverters in HVDC systems.

EPE 1993 - 20 - Lecture Session L7b: GENERATION AND TRANSMISSION: ACTIVE POWER FILTERS, HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 20 - Lecture Session L7b: GENERATION AND TRANSMISSION: ACTIVE POWER FILTERS, HVDC
	[return to parent folder]

	HYBRID ACTIVE FILTER FOR PARALLEL HARMONIC COMPENSATION By N. Balbo; D. Sella; R. Penzo; G. Bisiach; D. Cappellieri; L. Malesani; A. Zuccato	[View] [Download]
Abstract: The interest in the application of the active filters to the harmonic compensation increases with the rise of the pollution of the utility networks by distorting electronic loads. The high cost of these filters limited, up to now, their diffusion in the industrial applications. Acceptable results can be obtained by hybrid units, including passive filters networks associated with active units which integrate and control the passive filtering. The active section can be sized only at a fraction of the total compensating power rating. In the paper, the design criteria and the implementation of an industrial filter unit, intended to the compensation of medium-power distorting loads is described. The design criteria to obtain flexible and robust operation, good transient capability and insensitivity to the resonance conditions with the supply are outlined. The proportioning of the passive section is discussed. The filter control system, with some peculiar features, is detailed. The experimental performance, in comparison with the simulated behaviour, is reported.

	CONTROL METHOD AND CHARACTERISTICS OF ACTIVE POWER FILTERS By S. Fukuda; T. Endoh	[View] [Download]
Abstract: This paper describes a control method with a combined filter system employing a current source converter and a high pass filter which senses load current, source current and line voltage to create reference signals for an active filter. The transfer function of the active filter is identified and is used for the control systen design. It is shown that the source current feedback is most effective to suppress the harmonic-enlarging effects due to parallel resonance and the harmonic current generated by source harmonic voltages. A small setup controlled by a DSP was built, and the validity of the proposed method was demonstrated by experimental results.

	HVDC SYSTEMS FAULT DIAGNOSIS WITH NEURAL NETWORKS By L. L. Lai; F. Ndeh-Che; Tejedo Chari; P. J. Rajroop; H. S. Chandrasekharaiah	[View] [Download]
Abstract: This paper describes a neural network and its simulation results for fault diagnosis in HVDC systems. Fault diagnosis is carried out by mapping input data patterns, which represent the behaviour of the system, to one or more fault conditions. The behaviour of the converters is described in terms of the time varying patterns of conducting thyristors and AC & DC fault characteristics. A three- layer neural network consisting of 20 input nodes, 12 hidden nodes and 4 output nodes is used. 16 different faults have been considered and dynamic characteristics of networks for different configurations are studied too. The time performance of the network is also included. Neural networks provide an effective way for fault diagnosis.

	USING A THREE-LEVEL GTO VOLTAGE SOURCE INVERTER IN A HVDC TRANSMISSION SYSTEM By G. Lipphardt	[View] [Download]
Abstract: Some aspects of the feasibility of three-level voltage source GTO inverters in HVDC applications are discussed. After presenting the converter topology a simplified point-to-point transmission with a conventional thyristor rectifier station and a three-level voltage source GTO inverter station is simulated using EMTP (ElectroMagnetic Transient Program). The static behaviour and some aspects of the dynamic behaviour of the transmission are shown. Problems and open questions to be solved in future are mentioned. The results show that the three-level voltage source inverter is a possible alternative for future use of forced commutated inverters in HVDC systems.