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Estimation method of external network Thevenin equivalent parameters based on single point measurement information

A Thevenin equivalent and measurement technology, applied in the field of value parameter estimation, can solve the problem that the equivalent results cannot be directly applied to online analysis and control decision-making, cannot avoid the negative value of the equivalent parameter resistance, and does not consider the physical meaning of the equivalent parameter. and other problems, to achieve the effect of fast calculation speed, low impact and strong practicability

Inactive Publication Date: 2012-06-27
CHONGQING UNIV
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Problems solved by technology

The main disadvantages of this method are: the influence of measurement errors on the calculation results of equivalent parameters cannot be avoided, and the equivalent accuracy is low
The main disadvantages of this method are: the physical meaning of equivalent parameters is not considered, and unreasonable phenomena such as negative resistance in equivalent parameters cannot be avoided, and the equivalent results cannot be directly applied to online analysis and control decision-making of power system voltage stability

Method used

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  • Estimation method of external network Thevenin equivalent parameters based on single point measurement information
  • Estimation method of external network Thevenin equivalent parameters based on single point measurement information
  • Estimation method of external network Thevenin equivalent parameters based on single point measurement information

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Embodiment

[0031] Such as figure 1 , 2 As shown, the specific steps of an estimation method of Thevenin equivalent parameters in the external network based on single-point measurement information are as follows:

[0032] (1) Input basic data

[0033] First input the basic data and convergence accuracy of the monitored line ε and number of time slots n . The basic data of the line are the line resistance, reactance and susceptance parameters, the rated voltage of the line, the power reference and the end of the line n The SCADA measurement data of each period, that is, the amplitude of the voltage at the end of the line, the amplitude of the current at the end, and the active power and reactive power at the end;

[0034] Such as figure 2 The parameters of the monitored power line shown are: resistance R = 1.1297Ω, reactance X = 3.3471Ω, susceptance to ground b = 2.45306×10 -5 S; the rated voltage of the line is U B = 110 kV, power reference S B = 100 MVA. Number o...

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Abstract

The invention provides an estimation method of external network Thevenin equivalent parameters based on single point measurement information, relating to the power system external network Thevenin equivalent parameters estimation method technology field. According to the invention, a computer and a data acquisition apparatus of a line terminal are utilized, through a program, firstly a parameter of a monitored line is inputted, then according to SCADA measurement data of a plurality of periods of a terminal of the monitored line, a least square equivalence model with minimum of square sum of residuals as an object is established, the model is solved, and equivalent built-in potential and an equivalent impedance parameter of a network outside of the monitored line are obtained. According to the invention, a physical meaning of the external network Thevenin equivalent parameters is fully considered, rationality of the external network equivalent parameters can be effectively ensured, influence of a measurement error on an equivalent parameters calculation result can be effectively avoided, accuracy is high, the method is simple, estimation precision is high, a calculation speed is fast, and the method can be widely applied to the estimation of the external network Thevenin equivalent parameters of any power line whose terminal is installed with the data acquisition apparatus.

Description

technical field [0001] The invention belongs to the technical field of estimation methods for equivalent parameters of an external network of a power system, and in particular relates to a method for estimating the Thevenin equivalent parameters of an external network of a power system. Background technique [0002] Modern power systems have developed into large-scale, multi-regional interconnected grids. Due to the large amount of calculation and long calculation time for analyzing the entire power grid, and it is also difficult to obtain all real-time measurement information of the whole network synchronously, it is usually necessary to simplify the external network to the equivalent value in the online calculation and analysis of the power system. Among them, the Thevenin equivalent value is One of the most commonly used equivalent methods for single-ended external networks. The accuracy of the equivalent parameters of the external network is directly related to the accu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00
Inventor 颜伟母燕妮赵霞余娟赵瑞锋李翔王芳
Owner CHONGQING UNIV
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