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Electric network parameter estimation method based on parameter sensitivity of state estimation residual error

A technology for state estimation and power grid parameters, which is applied in the field of power grid parameter identification in power systems, and can solve the problems of unestimable estimation results, unreasonable, and poor numerical stability of branch parameters.

Inactive Publication Date: 2010-01-27
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0009] This method can only improve the numerical stability problem to a certain extent. In field application, problems such as unestimable branch parameters or unreasonable estimation results often occur when using this method, and the numerical stability is still poor; There are local optimality problems that have not been well resolved

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  • Electric network parameter estimation method based on parameter sensitivity of state estimation residual error
  • Electric network parameter estimation method based on parameter sensitivity of state estimation residual error
  • Electric network parameter estimation method based on parameter sensitivity of state estimation residual error

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Embodiment Construction

[0062] The power grid parameter estimation method based on the sensitivity of the state estimation residual parameters proposed by the present invention includes the following steps:

[0063] (1) Establish the least squares state estimation model of the power grid, and use the fast decomposition method to solve the model to obtain the state estimation result x e ;

[0064] The least squares state estimation model is:

[0065] Residual objective function:

[0066] J ( x , a ) = X i A Ω r w i v ( v i m - v i ) 2 + X i A Ω P c w i P ( P i m - P i ) 2 + X i A Ω Q c w i Q ( Q i m - Q i ) 2 + X i , j A Ω P F w ij P ( P ij m - P ij ) 2 + X i , j A Ω Q F w ij Q ( Q ij m - Q ij ) 2

[0067] Equalit...

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Abstract

The invention relates to an electric network parameter estimation method based on the parameter sensitivity of a state estimation residual error, which belongs to the technical field of electric network parameter identification of electric power systems. The electric network parameter estimation method comprises the following steps: deducing the sensitivity of the state estimation residual error for each circuit parameter of an electric network according to an actual electric network model and real-time measuring data; and modifying the circuit parameter on the prior suspicious branch circuit by adopting a linear optimization method, thereby increasing the reliability and the accuracy of application software. The electric network parameter estimation method based on the parameter sensitivity of the state estimation residual error does not have the problems of numerical stability and observation performance and has simple calculation, easy realization and high calculation speed.

Description

Technical field [0001] The invention relates to a power grid parameter estimation method based on the sensitivity of state estimation residual parameters, and belongs to the technical field of power system grid parameter identification. Background technique [0002] The error of branch parameters will lead to unreliable power grid online control decisions and safety and stability warning results based on Energy Management System (EMS). With the expansion of the power grid, new application software based on EMS network analysis continues to emerge. The reliability and accuracy of EMS software analysis and decision-making are increasingly required. The study of practical parameter estimation methods has important practical significance. [0003] In parameter identification, the application of the estimation of on-load tap-changing transformer transformation ratio in EMS has been relatively mature, but the practical research of branch impedance parameter estimation is relatively few. ...

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Application Information

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IPC IPC(8): H02J3/00G06N7/00
Inventor 吴文传张伯明孙宏斌郭庆来曾兵
Owner STATE GRID CORP OF CHINA
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