Double-transformer substation harmonic wave state estimation method
A harmonic state estimation and dual transformer technology, applied in the direction of instruments, measuring electrical variables, measuring current/voltage, etc., can solve the problem of increasing the cost of harmonic state estimation, the influence of the dispersion of power grid state parameters, and the lack of consideration of parameter dispersion, etc. problem, to achieve the effect of improving accuracy, strong feasibility and reducing cost
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[0038] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0039] Harmonic state estimation theory:
[0040] Harmonic state estimation takes node voltage as state quantity, node voltage, branch current and node injection current as quantity measurement, and uses injection current source to represent nonlinear load, and decoupling between harmonics is achieved.
[0041] The mathematical model of harmonic state estimation can be expressed as
[0042] Z = HX + ε (1)
[0043] Where Z for m ×1 dimensional measurement phasor; X To be determined n ×1 dimensional state phasor; H For the relationship between the measured value and the state variable m X n Dimensional measurement matrix, which is related to the topological structure of the system, the basic admittance matrix and the measurement configuration scheme of the system; ε Caused by random noise, converter errors, and communication problems m ×1 dimensional me...
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