Abstract:

Aiming to the precision and real-time analysis requirement of transient component in power system fault signal, a new time-frequency correlation analysis algorithm was presented, whose frequency domain segmentation is different from Mallat. This algorithm can run in real time, which makes precision, flexible and focused domain segmentation. At the same time, time-frequency correlation in the full frequency-range is maintained. An FPGA-based example module to implement this algorithm was designed. A MATLAB-based distributed parameter grid simple model was established. Simulation on this module provided 500 kHz-sampled-value sequence of fault signal. The capability and practicability was preliminarily proved by providing the sampled-value sequence to the example module. The application strategy for designing relay protection algorithm was suggested, and prospects of the work associated with this algorithm was provided.

Key words: relaying protection, transient based protection, wavelet transformation, time-frequency correlation analysis, field-programmable gate array (FPGA)