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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

Active Publication Date: 2019-07-23
STATE GRID LIAONING ELECTRIC POWER RES INST +1
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Problems solved by technology

Due to the increase of the dimension of the state quantity, this type of method reduces the redundancy of the system, reduces the numerical stability, and even leads to non-convergence in severe cases.

Method used

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  • Two-stage power grid parameter estimation method
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  • Two-stage power grid parameter estimation method

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Embodiment Construction

[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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Abstract

The invention relates to a two-stage power grid parameter estimation method comprising the following steps: establishing a suspicious error parameter detection model based on an optimal measurement section, and detecting a suspicious error parameter in a power grid; using the suspicious error parameter as an augmentation state variable to establish a segmented augmentation state estimation model so as to realize the correction of the suspicious error parameter. According to the estimation method in the invention, the calculation precision is high, through a segmented target function model, themutual influence between the error parameters and the influence of bad data on the parameter estimation precision are reduced, and high parameter estimation accuracy is achieved; the method in the invention has the advantages that detection and correction of the parameter errors can be realized when the bad data and multiple parameter errors exist at the same time; the mutual influence between the error parameters and between the error parameters and the error measurement can be automatically eliminated, and the method is simple and convenient. Therefore, the method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of power system parameter identification, in particular to a two-stage parameter estimation method. Background technique [0002] With the continuous expansion of the power grid, the power system model has become more complex, and the number of various system parameters has also increased explosively. The normal operation of the system puts forward higher requirements for the accuracy of the parameters. At the same time, due to the artificial setting errors of parameters and the occasional parameter drift of various equipment due to periodic power grid maintenance and transformation, advanced applications based on system parameters have large calculation errors, or even fail to converge. Therefore, how to accurately identify and correct network parameter errors is an important issue in the precise modeling of power systems. [0003] The existing parameter identification methods can be roughly divided into s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G01R31/00
CPCH02J3/00G01R31/00H02J2203/20Y02E60/00
Inventor 王顺江张昱李铁姜枫潘美艳赵军崔岱潘鹏飞唐俊刺黄佳伟曾辉张宇时丛海洋许小鹏詹克明孙乔侯验秋王刚句荣斌肖黎丽李蔚张文艳凌兆伟雷博王洪哲
Owner STATE GRID LIAONING ELECTRIC POWER RES INST
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