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A three-phase linear generalized state estimation method for substations

A state estimation, substation technology, applied in computing, electrical components, circuit devices, etc., can solve problems such as lack of

Active Publication Date: 2016-03-02
NARI TECH CO LTD
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  • Application Information

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Problems solved by technology

As the preprocessing stage before the state estimation of the control center, the generalized state estimation of the substation needs to be fast and reliable in order to provide more accurate basic data for the control center, and the existing generalized state estimation methods do not have this feature.

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  • A three-phase linear generalized state estimation method for substations
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  • A three-phase linear generalized state estimation method for substations

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present invention.

[0039] Such as figure 1 As shown, a substation three-phase linear generalized state estimation method includes the following steps:

[0040] Step 1: Divide the substation into n voltage levels with the transformer as the boundary. In each voltage level, form zero-impedance branches into a zero-impedance network, where n is a positive integer, and go to step 2.

[0041] Step two, define b=1, go to step three.

[0042]Step 3: Neglect the three-phase phase-to-phase mutual inductance between the zero-impedance branches in the b-th voltage level, establish a phase-separated zero-impedance network as the network model for the three-phase linear generalized state estimation of the substation, and go...

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Abstract

A transformer substation three-phase linear generalized state estimation method, comprising: establishing a linear measurement equation and an on-off state pseudo measurement equation based on split-phase zero impedance network by using three-phase multisource real-time data from a measurement and control device, phasor measurement unit and protective device to participate in the state estimation together; identifying bad data with the maximum residual error method, and simultaneously identifying topology errors. The method improves data redundancy and calculation reliability for state estimation and eliminates the need for iterative calculation, and resolves the bad data and topology error within the transformer substation, thus providing more accurate basic data and reducing state estimation calculation for a regulation and control center.

Description

technical field [0001] The invention relates to a three-phase linear generalized state estimation method of a substation, which belongs to the field of substation automation. Background technique [0002] Power system state estimation uses the measurement data collected by substations to estimate or predict the operating state of the power system. State estimation is the basis of the information processing stage in the energy management system, which directly affects the decision-making of the control center and is related to the safe and stable operation of the power grid. Traditional state estimation ignores the interaction among the three data of analog quantity, switch quantity and network parameters. Before state estimation, it is assumed that the switch state and network parameters are correct. When these assumptions are not established, it will lead to serious errors. [0003] The generalized state estimation method models suspicious substations in detail, and uses n...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F19/00
CPCG16Z99/00H02J3/00H02J2203/20Y02E60/00
Inventor 张婷翟明玉张海滨齐苗苗
Owner NARI TECH CO LTD