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Fast decoupled state estimation method of power network for processing branch circuit measurement

A state estimation and branch current technology, applied in data processing applications, computing, electrical components, etc., can solve problems such as inability to handle current measurement, and achieve the effect of a small amount of computing burden

Active Publication Date: 2017-05-31
STATE GRID FUJIAN ELECTRIC POWER CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a method for fast decomposition state estimation of the power grid, which overcomes the shortcomings and deficiencies that the existing fast decomposition state estimation technology cannot handle current measurement

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  • Fast decoupled state estimation method of power network for processing branch circuit measurement
  • Fast decoupled state estimation method of power network for processing branch circuit measurement
  • Fast decoupled state estimation method of power network for processing branch circuit measurement

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0044] This embodiment provides a method for quickly decomposing and estimating the state of the grid for processing branch current measurement, such as figure 1 shown, including the following steps:

[0045] Step S1: Establishing the objective function: remember that y represents the state variable, including the voltage variable (U i ∠θ i ), branch power flow vector (P ij ,Q ij ,P ji ,Q ji ); Z represents the measurement quantity; w i Represents the weight of the i-th measurement, the state estimation model minimizes the residual of the weighted least squares method, and its objective function is as follows:

[0046]

[0047] Among them, y={U i ,θ i ,P ij ,Q ij ,P ji ,Q ji};

[0048] Step S2: Establish the measurement equation h(y) of the measured variable and the estimated variable, and perform various measurements, including the fol...

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Abstract

The invention relates to a fast decoupled state estimation method of a power network for processing branch circuit measurement. The defect and the disadvantage that circuit measurement cannot be processed by an existing fast decoupled state estimation technology are overcome; circuit measurement is expressed by adopting an active power loss and a reactive power loss of a branch while the branch current measurement is not directly formed and novel measurement has the property of a fast decoupled method, so that a small amount of computation burden and the characteristic of quick convergence are generated, and the fast decoupled state estimation method is suitable for large-scale state estimation of the power network containing the branch circuit measurement.

Description

technical field [0001] The invention relates to the field of network state estimation in electric power systems, in particular to a method for quickly decomposing the state of the network for processing branch current measurement. Background technique [0002] Fast Decoupled State Estimation (FDSE) has been widely used in Electric Power Control Center (EPCC), which is effective and suitable for most electric networks. [0003] The traditional FDSE is calculated based on the constant measurement Jacobian matrix of XB or BX, which is difficult to solve when encountering branch current measurement. For a typical urban electricity network, branch current measurement is deployed on the feeder side to monitor the operating status of the grid. Therefore, it is necessary to propose a grid state estimation method based on branch current measurement. Traditional nonlinear Jacobian-based methods suffer from heavy memory cost or computational burden. Contents of the invention [00...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q50/06
CPCG06Q50/06H02J3/00H02J2203/20
Inventor 林毅巨云涛李荣敏奚耀冕蒋朋博葛夫超
Owner STATE GRID FUJIAN ELECTRIC POWER CO LTD