Abstract
Generalized S-transform is a time-frequency analysis method which has higher resolution than S-transform. It can precisely extract the time-amplitude characteristics of different frequency components in the signal. In this paper, a novel protection method for VSC-HVDC (Voltage source converter based high voltage DC) based on Generalized S-transform is proposed. Firstly, extracting frequency component of fault current by Generalized S-transform and using mutation point of high frequency to determine the fault time. Secondly, using the zero-frequency component of fault current to eliminate disturbances. Finally, the polarity of sudden change currents in the two terminals is employed to discriminate the internal and external faults. Simulations in PSCAD/EMTDC and MATLAB show that the proposed method can distinguish faults accurately and effectively.
Highlights
More and more VSC-HVDC projects are using cables as transmission lines
Generalized S-transform is a time-frequency analysis method which has higher resolution than S-transform. It can precisely extract the time-amplitude characteristics of different frequency components in the signal
Due to the small damping of VSC-HVDC System, DC cable fault will cause serious over-current in a short time, which will lead to serious faults on transmission cables and the converter
Summary
More and more VSC-HVDC projects are using cables as transmission lines. Due to the small damping of VSC-HVDC System, DC cable fault will cause serious over-current in a short time, which will lead to serious faults on transmission cables and the converter. VSC-HVDC system has some problems, such as fault identification, self-healing and so on [1] [2] [3]. It is significant to study the fault characteristics of VSC-HVDC cables and realize the protection of VSC-HVDC System by analyzing the fault characteristics. The S transform was proposed in [4] and [5] by Stockwell. In [6] and [7], the feature signal is extracted by S transform of the fault signal.
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