Two-stage linear weighted least-square power system state estimation method

A linear weighting and least squares technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve problems such as difficult convergence, not well resolved, non-convergence, etc.
CN102801162AActive Publication Date: 2012-11-28TSINGHUA UNIV +1
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
TSINGHUA UNIV
Publication Date
2012-11-28

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Abstract

The invention provides a two-stage linear weighted least-square power system state estimation method which is characterized by comprising the following steps of: forming a network model, and calculating a node admittance matrix and a branch-node relationship matrix; transforming a measurement vector and a state vector; forming an accurate linear measurement equation; performing the first stage of linear weighted least-square estimation to obtain the estimated value of the transformed state vector; performing inverse transformation, and performing the second stage of linear weighted least-square estimation to obtain the estimated values of the voltage amplitudes and phase angles of all nodes; and identifying bad data. According to the two-stage linear weighted least-square power system state estimation method provided by the invention, more scientific state estimation result can be obtained, the calculation efficiency is higher, and the engineering application prospect is good.
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Description

technical field

[0001] The invention relates to the field of power system scheduling automation, in particular to a two-stage linear weighted least squares power system state estimation method. Background technique

[0002] Power system state estimation is the basis and core of the energy management system. Its function is to filter the real-time information provided by the data acquisition and monitoring system (SCADA), so as to obtain the estimated value of the state variables (voltage amplitude and phase angle) of the whole network. Furthermore, estimated values โ€‹โ€‹such as branch power and node injection power can be obtained.

[0003] Since foreign scholars proposed the first model of state estimation in 1970, scholars and engineers at home and abroad have conducted a large number of in-depth research and practice on state estimation. Now almost every dispatch center in the world has deployed state estimators. The basic position of state estimation in the safe operation ...

Claims

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