Short Circuit Fault Identification Method for Flexible DC Transmission System Based on Singular Value Decomposition
The conventional methods for identifying short circuit faults in power transmission systems mainly focus on i-dentifying changes in fault waveforms,and are inadequate in identification accuracy owing to the influence of transmission system's operating status.Therefore the present work proposed the design of a short-circuit fault identification method for flexible DC transmission systems based on singular value decomposition.The short-circuit fault characteristics of the flexi-ble DC transmission system,including positive sequence components of normal operating state and negative sequence com-ponents of faulty state,were obtained by feature extraction and converted into frequency domain form,in which the nega-tive sequence components were retained,for subsequent fault identification.The singular value decomposition was intro-duced to identify short circuit fault interval of transmission system and divide it into two parts,i.e.,external fault identifi-cation and internal fault identification according to the stability of singular values,thus achieving accurate identification of short circuit faults.The method was verified by simulative experiments to have satisfactory identification accuracy.
singular value decompositionflexible DC transmission systemshort circuit faultidentification method
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