Supertension line fault phase selection method based on voltage fault component
A line fault and voltage fault technology, applied in the field of high-voltage power grid, can solve the problems of complex algorithm and large amount of calculation, and achieve the effect of reducing the amount of calculation, simple equation of state, and good filtering effect.
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[0023] Example 1
[0024] Such as figure 1 Shown, the structure diagram of the ultra-high voltage transmission system. Refer to the Beijing-Tianjin-Tangshan 500kV ultra-high voltage transmission line parameters.
[0025] Such as figure 2 Shown, the realization flow chart of fault phase selection. The sampled value is filtered by Kalman to obtain the voltage fundamental frequency component, and then the identification coefficient of each fault phase is calculated. According to the characteristics of the coefficient in different fault conditions, the purpose of phase selection is achieved.
[0026] Step one, by establishing a Kalman filter model, achieve the purpose of extracting the fundamental frequency voltage component and reduce the influence of harmonics on the phase selection algorithm.
[0027] The harmonic components considered by the present invention are 2-5 harmonics, the state transition matrix of the Kalman filter model used is a 10-th order square matrix, and the state...
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