Transient protection method, system and device for extra-high voltage direct current transmission line
The invention provides a transient protection method, system and device for an extra-high voltage direct current transmission line. Aiming at the problems that the wavelet packet algorithm has frequency aliasing and the decomposition speed of characteristic signals is low, the invention provides an...
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| creator | LIU DONG QIAO HUI GONG QINGWU WANG JUNFANG QI SIQING DOU YUYU |
| description | The invention provides a transient protection method, system and device for an extra-high voltage direct current transmission line. Aiming at the problems that the wavelet packet algorithm has frequency aliasing and the decomposition speed of characteristic signals is low, the invention provides an improved wavelet packet transformation algorithm, fault voltage and current are decomposed, and an abnormal frequency spectrum component is constructed as a criterion of unipolar and bipolar faults. In addition, the method comprehensively considers that the amplitude change of the voltage and current of the monitoring point after the fault is utilized to construct the criterion of fault starting, and then the criterion of internal and external faults is constructed by utilizing the voltage ratios delta in and delta ex under different frequencies. According to the method, the fault protection of the extra-high voltage direct current transmission line can be quickly and accurately realized, the phenomena of misoperat |
| format | Patent |
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Aiming at the problems that the wavelet packet algorithm has frequency aliasing and the decomposition speed of characteristic signals is low, the invention provides an improved wavelet packet transformation algorithm, fault voltage and current are decomposed, and an abnormal frequency spectrum component is constructed as a criterion of unipolar and bipolar faults. In addition, the method comprehensively considers that the amplitude change of the voltage and current of the monitoring point after the fault is utilized to construct the criterion of fault starting, and then the criterion of internal and external faults is constructed by utilizing the voltage ratios delta in and delta ex under different frequencies. 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Aiming at the problems that the wavelet packet algorithm has frequency aliasing and the decomposition speed of characteristic signals is low, the invention provides an improved wavelet packet transformation algorithm, fault voltage and current are decomposed, and an abnormal frequency spectrum component is constructed as a criterion of unipolar and bipolar faults. In addition, the method comprehensively considers that the amplitude change of the voltage and current of the monitoring point after the fault is utilized to construct the criterion of fault starting, and then the criterion of internal and external faults is constructed by utilizing the voltage ratios delta in and delta ex under different frequencies. According to the method, the fault protection of the extra-high voltage direct current transmission line can be quickly and accurately realized, the phenomena of misoperat</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CALCULATING CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER COMPUTER SYSTEMS BASED ON SPECIFIC COMPUTATIONAL MODELS COMPUTING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER COUNTING ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION HANDLING RECORD CARRIERS PHYSICS PRESENTATION OF DATA RECOGNITION OF DATA RECORD CARRIERS SYSTEMS FOR STORING ELECTRIC ENERGY |
| title | Transient protection method, system and device for extra-high voltage direct current transmission line |
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