Two-stage power grid parameter estimation method
A power grid parameter and stage technology, applied in the field of power system parameter identification, can solve problems such as reduced numerical stability, non-convergence, and reduced system redundancy, and achieve the effects of avoiding missed detection, reducing mutual influence, and high calculation accuracy
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[0039] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] Such as figure 1 As shown, the present invention provides a two-stage parameter estimation method, including the following steps performed in sequence:
[0041] Step 1) Establish a suspicious error parameter detection model based on the optimal measurement section to detect suspicious error parameters in the power grid. The optimal measurement section detection model is:
[0042]
[0043] In the formula, t is the optimal number of measuring sections; P e is the error parameter vector of the N-dimensional network; n is the total number of all measurement sections; λ ∑i is the cumulative Lagrange multiplier of the error parameter, and its calculation formula is:
[0044] lambda ∑i =λ i,1 +λ i,2 +...+λ i,N
[0045]
[0046] where x i is the state quantity of the i-th measurement section; J i (x i ,P e ) is the objective ...
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