Multi-terminal hybrid DC line protection method based on measurement wave impedance phase characteristics
The invention relates to a multi-terminal hybrid direct-current line protection method based on measurement wave impedance phase characteristics, which comprises the following steps of: measuring polar line voltage and polar line current of each measurement point, performing phase-mode conversion an...
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Main Authors | , , , , , |
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Format | Patent |
Language | Chinese English |
Published |
04.11.2022
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Subjects | |
Online Access | Get full text |
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Summary: | The invention relates to a multi-terminal hybrid direct-current line protection method based on measurement wave impedance phase characteristics, which comprises the following steps of: measuring polar line voltage and polar line current of each measurement point, performing phase-mode conversion and S conversion to extract measurement wave impedance phase-frequency characteristics at two ends of a line; and the measured wave impedance phases at the two ends of the line have significant differences under the internal and external fault conditions, and a voltage traveling wave amplitude criterion is constructed according to the corresponding relation to realize fault identification. Through PSCAD simulation verification, the protection provided by the invention can distinguish T-region bus faults, has good anti-transition resistance and noise capability while meeting rapidity, and meets the main protection requirements of a multi-terminal hybrid direct current system line.
本发明涉及基于测量波阻抗相位特性的多端混合直流线路保护方法,通过测量各测量 |
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Bibliography: | Application Number: CN202210754709 |