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Evaluation method of power system state estimated result based on expanded uncertainty

A state estimation, power system technology, applied in information technology support systems, computing, electrical components, etc., can solve problems such as inability to know exactly

Inactive Publication Date: 2009-12-30
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

In practical applications, the true value of the measured value is an unknown quantity that cannot be accurately known, so the error is only a theoretical concept, which cannot be accurately known in practice, and has limitations in use.
How to make a reasonable evaluation of the state estimation results when the measured true value is unknown is a blind spot in the current state estimation research, but it is an important problem that must be solved first and foremost in state estimation.

Method used

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  • Evaluation method of power system state estimated result based on expanded uncertainty
  • Evaluation method of power system state estimated result based on expanded uncertainty
  • Evaluation method of power system state estimated result based on expanded uncertainty

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Embodiment Construction

[0066] The present invention proceeds according to the following steps:

[0067] Step (1), obtain the network parameters of the power system from the energy management system, including: each branch number of the transmission branch, the first node number, the last node number, series resistance, series reactance, parallel conductance, parallel susceptance, and Variation and impedance of the transformer.

[0068] Step (2): Obtain remote measurement values ​​and remote signaling measurement values ​​from the network data server of the data acquisition and monitoring system SCADA, where:

[0069] Remote measurement values ​​include: voltage amplitude, generator active power, generator reactive power, load active power, load reactive power, active power at the branch head, reactive power at the branch head, and active power at the end of the branch , Reactive power at the end of the branch, and the amplitude of the branch current;

[0070] The remote signal measurement value includes...

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Abstract

The invention relates to an evaluation method of a power system state estimated result based on expanded uncertainty, which belongs to the field of the analysis and computation of power system state. The method is characterized in that the expanded uncertainty of each measuring point is defined according to the international evaluation and expression of uncertainty of measurement; measuring point normal rate eta index, eta 2 / 3 index and eta 1 / 3 index are constructed based on the expanded uncertainty; then all the results obtained by performing state evaluation and computation to measured values are evaluated by adopting the indexes; the state estimated result of larger index is selected to be output. The method has rationality, practicability and popularization.

Description

Technical field [0001] The technical invention belongs to the field of power system analysis and calculation. Background technique [0002] When the true value of the measuring point is unknown, how to give a reasonable evaluation method to the power system state estimation is the first and must be solved in the state estimation research. In previous studies, only the evaluation index when the true value of the measuring point is known is given, which is mainly used in simulation research. Through artificial setting of the true value and measurement value, the state estimation research is carried out, and the norm and infinite norm are used to estimate The distance between the value and the true value is measured, namely: [0003] S 1 =∑|x i -x i |, [0004] S 2 =max|x i -x i | [0005] Where x i , X i Are the estimated value and the true value of the i-th component of the state estimation result x, respectively. S 1 , S 2 They are used to measure the overall deviation and the ma...

Claims

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Application Information

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IPC IPC(8): G06F17/50H02J3/00
CPCY04S40/22Y02E60/76Y02E60/00
Inventor 何光宇董树锋王雅婷梅生伟刘锋
Owner TSINGHUA UNIV
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