Response characteristics of HVDC system according to frequency sensing methods

Response characteristics of HVDC system according to frequency sensing methods

This paper deals with the frequency sensing methods at HVDC system. The objects of frequency information in HVDC system are to fire a valve and to control a frequency of AC network. Conventionally, there are two methods to measure a frequency of AC network. The first method is to draw out from the s...

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Hauptverfasser: Chan-Ki Kim, Jong-Kwang Park, Gil-Jo Jeong, Jeong-Shik Ahn
Format: Tagungsbericht
Sprache:eng
Schlagworte:
Control systems
Curve fitting
Fires
Frequency measurement
HVDC transmission
Robustness
Shafts
Synchronous generators
Synchronous machines
Valves
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Jong-Kwang Park
Gil-Jo Jeong
Jeong-Shik Ahn
description This paper deals with the frequency sensing methods at HVDC system. The objects of frequency information in HVDC system are to fire a valve and to control a frequency of AC network. Conventionally, there are two methods to measure a frequency of AC network. The first method is to draw out from the synchronous machine and the second method is from AC network. Two methods have advantages and disadvantage each other. For the extreme case of a receiving system of zero inertia (no generation), synchronous machine is essential. In this situation, the frequency information received from the synchronous machine shaft. However, the speed of synchronous machine is oscillated when a disturbance in AC network occurs, and HVDC may be oscillated due to an oscillation speed. To solve this drawback, in this paper, new frequency sensing method is proposed. A proposed method that is used a modified curve-fitting algorithm, has a robust characteristics against a harmonics and unbalanced faults. Consequently, A proposed method is verified by PSCAD/EMTDC program and experimental test.
doi_str_mv 10.1109/IECON.2003.1280666
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The objects of frequency information in HVDC system are to fire a valve and to control a frequency of AC network. Conventionally, there are two methods to measure a frequency of AC network. The first method is to draw out from the synchronous machine and the second method is from AC network. Two methods have advantages and disadvantage each other. For the extreme case of a receiving system of zero inertia (no generation), synchronous machine is essential. In this situation, the frequency information received from the synchronous machine shaft. However, the speed of synchronous machine is oscillated when a disturbance in AC network occurs, and HVDC may be oscillated due to an oscillation speed. To solve this drawback, in this paper, new frequency sensing method is proposed. A proposed method that is used a modified curve-fitting algorithm, has a robust characteristics against a harmonics and unbalanced faults. 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However, the speed of synchronous machine is oscillated when a disturbance in AC network occurs, and HVDC may be oscillated due to an oscillation speed. To solve this drawback, in this paper, new frequency sensing method is proposed. A proposed method that is used a modified curve-fitting algorithm, has a robust characteristics against a harmonics and unbalanced faults. Consequently, A proposed method is verified by PSCAD/EMTDC program and experimental test.</abstract><pub>IEEE</pub><doi>10.1109/IECON.2003.1280666</doi></addata></record>
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subjects Control systems
Curve fitting
Fires
Frequency measurement
HVDC transmission
Robustness
Shafts
Synchronous generators
Synchronous machines
Valves
title Response characteristics of HVDC system according to frequency sensing methods
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