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An Interval State Estimation Method of Power System

A state estimation and power system technology, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as large errors, and achieve the effect of good estimation accuracy

Active Publication Date: 2017-07-18
HOHAI UNIV
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  • Claims
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Problems solved by technology

Uncertain variables can be considered as inequality constraints, and the maximum constraint satisfaction is the objective function. This method is only an approximate model with large errors

Method used

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  • An Interval State Estimation Method of Power System
  • An Interval State Estimation Method of Power System
  • An Interval State Estimation Method of Power System

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Embodiment Construction

[0066] Below in conjunction with accompanying drawing, the technical process of invention is described in detail:

[0067] From a mathematical point of view, power system state estimation is a nonlinear optimization problem with constraints. Considering parameter uncertainty, since interval state estimation is difficult to solve directly, the present invention adopts a two-step linearization state estimation method, that is: using the idea of ​​variable substitution, a set of intermediate variables is set, so that the nonlinear state of the power system The estimation is transformed into a two-step linear state estimation problem, and the nonlinear transformation of one-step variables is included between the two linear state estimates.

[0068] One-Stage Linear State Estimation

[0069] For each branch connecting bus i to bus j, define the following variables:

[0070] K ij =V i V j cosθ ij

[0071] L ij =V i V j sinθ ij

[0072] Where: V i , V j are the voltage ...

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Abstract

The invention discloses a power system interval state estimation method. According to the power system interval state estimation method, interval analysis is applied to state estimation with the consideration of parameter uncertainty, the measured quantity and parameters of a power grid can be reasonably utilized to estimate the distribution interval of the state quantity, and therefore more sufficient electrical information is provided for dispatching operating personnel. The power system section state estimation method comprises the steps that firstly, system analysis is conducted on the influence of parameter uncertainty on state analysis, and a state estimation model with the consideration of parameter uncertainty is provided; secondly, a variable substitution technology is provided, nonlinear state estimation is converted into two-step linearization, and conservatism in the interval estimation process is eliminated through an affine technology; finally, an IEEE14 node system is tested. The result shows that the power system interval state estimation method has high estimation accuracy.

Description

technical field [0001] The invention relates to a method for estimating an interval state of a power system, and belongs to the technical field of power system monitoring, uncertainty analysis and control. Background technique [0002] In the study of power system simulation calculation, the selection of methods and models is of course important, but the accuracy of model parameters has a great influence on the simulation results. By installing a large number of dynamic monitoring devices in the system, it can help to obtain relatively accurate parameters of system components. But even so, the uncertainty of the simulation model parameters still exists objectively for two reasons: first, the simulation mathematical model itself is an approximation of the entity, and the model parameters are only approximate quantitative indicators describing the attributes of the entity; second, the method of obtaining the model parameters When specifying numerical values, due to the existe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J13/00
Inventor 卫志农陈胜孙国强孙永辉臧海祥朱瑛楚云飞陈妤
Owner HOHAI UNIV
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