EPE Association: EPE 1997 – 12: Lecture Session L3d: HVDC

EPE 1997 – 12: Lecture Session L3d: HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 12: Lecture Session L3d: HVDC

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   ANALYSIS OF THE HVdc INVERTER IN THE HARMONIC DOMAIN
By G. Bathurst; B.C. Smith; N.R. Watson; J. Ardllaga [View]
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Abstract: This paper describes a converter model using a convolution technique within a unified Newton solution, to calculate harmonic distortion around an inverter. A minimum gamma controller is developed to allow the representation of the HV de inverter control. This illustrates the feasibility of non-linear discrete control within the harmonic domain. Validation of the model at two operating points is obtained by comparison of the harmonic domain spectra with the FFT of steady-state time domain simulations.

   COMPARISON OF ALTERNATE HVDC CONVERTER TOPOLOGIES
By K. Sadek; M. Pereira; D.P. Brandt; A. M. Gole; A. Daneshpooy [View]
[Download]

Abstract: Two non-conventional HVdc converter arrangements are compared. These include the Capacitor Commutated Converter (CCC) in which series capacitors are included between the converter transformer and the valves, and the Controlled Series Capacitor Converter (CSCC), based on more conventional topology, in which series capacitors are inserted between the ac filter bus and the ac network. Results show that both options have comparable steady state and transient performance. Danger of ferroresonance with the CSCC option is eliminated by controlling the amount of series compensation.

   PROPERTIES OF CAPACITOR COMMUTATED CONVERTERS IN LONG DC CABLE TRANSMISSIONS
By P. Holmberg; T. Jonsson; M. Lagerkvist [View]
[Download]

Abstract: This paper presents an analysis of the properties of Capacitor Commutated Converters, CCCs, in long DC cable transmissions. Comparisons with conventional converter properties are canied out in parallel. The focus is on the voltage stability of the inverter system, and the dynamic properties of CCCs in long cable transmissions are demonstrated: - improved immunity to inverter system voltage disturbance, - increased power transfer capability - reduced reactive power interaction with the AC system, resulting in a lower load rejection overvoltage.

   RANDOM MODULATION OF LINE COMMUTATED POWER CONVERTERS
By M. Alaküla; L. Sjöberg; P. Johansson [View]
[Download]

Abstract: HVDC systems with thyristor converter technology do, due to their fundamental design and modulation, generate a disturbing acoustic noise emission in the vicinity of the converter station. The energy of acoustical noise is concentrated to a few distinct frequencies and the psychacoustical impact is serere. Acoustic noise reduction is usually achieved with mechanical isolation, which is rather expensive due to the high voltages involved. In this paper a method is proposed, where the modulation strategy is altered to spread the acoustical energy in a wider spectrum, thus creating an acoustical noise similar to the soughing sound of the wind. Other consequences arc reduced need for filtering of distinct frequencies and a slightly reduced dynamic capability of the current control loop. The method is applicable also for other systems involving the same kind of converter technology, like DC drives.

   INVESTIGATION OF THE OPERATING PERFORMANCE OF A 4-TERMINAL HVDC SYSTEM
By H. Ring; U. Radtke [View]
[Download]

Abstract: A bipolar multi terminal HVDC transmission system has been investigated, particularly with respect to a safe and fast recovery after different types of disturbances in the AC and DC systems. Overvoltage phenomena caused by DC line-to-ground faults possibly lead to commutation failures in the unfaulted pole if no preventive measures are taken. In this respect the influence of two parallel DC lines per pole, the station power rating, the location of the station, and the location of the fault is discussed. The fault recovery times applying both DC circuit breakers and conventional fault clearing by DC current zero in the affected pole are compared at DC line faults and faults within a station.

   LIGHT TRIGGERED THYRISTOR VALVE FOR HVDC APPLICATION
By H.P. Lips; J. Matern; R. Neubert; L. Popp; M. Uder [View]
[Download]

Abstract: A next generation of technology as compared to the present HVDC thyristor valves with electrically triggered thyristors has been developed: an HVDC thyristor valve with directly light triggered thyristors including integrated breakover protection. For the thyristor gating and monitoring system an improved concept is used.

EPE 1997 – 12: Lecture Session L3d: HVDC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 12: Lecture Session L3d: HVDC
	[return to parent folder]

	ANALYSIS OF THE HVdc INVERTER IN THE HARMONIC DOMAIN By G. Bathurst; B.C. Smith; N.R. Watson; J. Ardllaga	[View] [Download]
Abstract: This paper describes a converter model using a convolution technique within a unified Newton solution, to calculate harmonic distortion around an inverter. A minimum gamma controller is developed to allow the representation of the HV de inverter control. This illustrates the feasibility of non-linear discrete control within the harmonic domain. Validation of the model at two operating points is obtained by comparison of the harmonic domain spectra with the FFT of steady-state time domain simulations.

	COMPARISON OF ALTERNATE HVDC CONVERTER TOPOLOGIES By K. Sadek; M. Pereira; D.P. Brandt; A. M. Gole; A. Daneshpooy	[View] [Download]
Abstract: Two non-conventional HVdc converter arrangements are compared. These include the Capacitor Commutated Converter (CCC) in which series capacitors are included between the converter transformer and the valves, and the Controlled Series Capacitor Converter (CSCC), based on more conventional topology, in which series capacitors are inserted between the ac filter bus and the ac network. Results show that both options have comparable steady state and transient performance. Danger of ferroresonance with the CSCC option is eliminated by controlling the amount of series compensation.

	PROPERTIES OF CAPACITOR COMMUTATED CONVERTERS IN LONG DC CABLE TRANSMISSIONS By P. Holmberg; T. Jonsson; M. Lagerkvist	[View] [Download]
Abstract: This paper presents an analysis of the properties of Capacitor Commutated Converters, CCCs, in long DC cable transmissions. Comparisons with conventional converter properties are canied out in parallel. The focus is on the voltage stability of the inverter system, and the dynamic properties of CCCs in long cable transmissions are demonstrated: - improved immunity to inverter system voltage disturbance, - increased power transfer capability - reduced reactive power interaction with the AC system, resulting in a lower load rejection overvoltage.

	RANDOM MODULATION OF LINE COMMUTATED POWER CONVERTERS By M. Alaküla; L. Sjöberg; P. Johansson	[View] [Download]
Abstract: HVDC systems with thyristor converter technology do, due to their fundamental design and modulation, generate a disturbing acoustic noise emission in the vicinity of the converter station. The energy of acoustical noise is concentrated to a few distinct frequencies and the psychacoustical impact is serere. Acoustic noise reduction is usually achieved with mechanical isolation, which is rather expensive due to the high voltages involved. In this paper a method is proposed, where the modulation strategy is altered to spread the acoustical energy in a wider spectrum, thus creating an acoustical noise similar to the soughing sound of the wind. Other consequences arc reduced need for filtering of distinct frequencies and a slightly reduced dynamic capability of the current control loop. The method is applicable also for other systems involving the same kind of converter technology, like DC drives.

	INVESTIGATION OF THE OPERATING PERFORMANCE OF A 4-TERMINAL HVDC SYSTEM By H. Ring; U. Radtke	[View] [Download]
Abstract: A bipolar multi terminal HVDC transmission system has been investigated, particularly with respect to a safe and fast recovery after different types of disturbances in the AC and DC systems. Overvoltage phenomena caused by DC line-to-ground faults possibly lead to commutation failures in the unfaulted pole if no preventive measures are taken. In this respect the influence of two parallel DC lines per pole, the station power rating, the location of the station, and the location of the fault is discussed. The fault recovery times applying both DC circuit breakers and conventional fault clearing by DC current zero in the affected pole are compared at DC line faults and faults within a station.

	LIGHT TRIGGERED THYRISTOR VALVE FOR HVDC APPLICATION By H.P. Lips; J. Matern; R. Neubert; L. Popp; M. Uder	[View] [Download]
Abstract: A next generation of technology as compared to the present HVDC thyristor valves with electrically triggered thyristors has been developed: an HVDC thyristor valve with directly light triggered thyristors including integrated breakover protection. For the thyristor gating and monitoring system an improved concept is used.