Large scale electric network low-frequency oscillation frequency division section detection method based on empirical mode decomposition
A technology of empirical mode decomposition and low frequency oscillation, applied in the direction of spectrum analysis/Fourier analysis, etc., can solve the problems of large calculation amount of detection method, inability to detect dangerous low frequency oscillation quickly and accurately at the same time, to reduce the amount of calculation, Guaranteed timeliness and accuracy, the effect of strong adaptability
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[0023] The technical solution of the present invention will be further described in detail below in accordance with the drawings in the specification and in combination with specific embodiments.
[0024] The invention proposes a low-frequency oscillation detection method of a power grid based on empirical mode decomposition and adopts frequency division, variable time window, variable sampling rate, and variable moving step technology. On the basis of ensuring the ability of ordinary empirical mode decomposition method to deal with complex waveforms with nonlinear, non-stationary changes, and non-periodic components, this method greatly speeds up the simultaneous spectrum analysis of a large number of phasor measurement unit (PMU) measured oscillation curves. Speed, which solves the problem that low-frequency oscillations of different frequencies have different requirements for alarm time, so that a large number of measured oscillation curves can be decomposed into natural mod...
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- IPC
- G01R23/16
- Inventors
- 段刚; 林俊杰