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Parameter estimation method for electric power circuit in T-type connection

A technology for connecting lines and estimating parameters, which is applied in the directions of measuring electricity, measuring electrical variables, measuring resistance/reactance/impedance, etc., and can solve problems such as estimating parameters of T-shaped connecting lines

Active Publication Date: 2012-06-20
STATE GRID CORP OF CHINA +4
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Problems solved by technology

The main disadvantage of this method is that it requires SCADA or PMU measurement data at both ends of the independent line to estimate the parameters of the line
Since the T-shaped connection line is a line that uses branch connections, there is no measurement data at the connection point (T node) of the three branch lines, that is, only one end of the three branch lines has measurement information. The line parameter estimation method based on multi-period measurement data cannot be used to estimate the parameters of the T-connection line

Method used

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  • Parameter estimation method for electric power circuit in T-type connection
  • Parameter estimation method for electric power circuit in T-type connection
  • Parameter estimation method for electric power circuit in T-type connection

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Embodiment

[0050] Such as figure 1 , 2 , Shown in 3, the specific steps of a parameter estimation method of a T-shaped connection power line are as follows:

[0051] (1) Input basic data

[0052] First, input the basic data of the T-shaped connection line to be estimated and the calculation accuracy of the parameter estimation ε and number of time slots n ,Require n ≥3. The basic data of the T-shaped connecting line is: the unit length resistance of the T-shaped connecting line r upper limit of r max and lower limit r min , the reactance per unit length x upper limit of x max and lower limit x min , susceptance per unit length b upper limit of b max and lower limit b min , the upper limit of the length of the three branches of the T-shaped connecting line l 1max , l 2max , l 3max and lower limit l 1min , l 2min , l 3min , the weight coefficients of voltage measurement, active power and reactive power measurement W u , W p with W q , and the SCADA ...

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Abstract

The invention discloses a parameter estimation method for an electric power circuit in T-type connection, which belongs to the technical field of parameter identification and estimation for circuits of power systems. A computer and data acquisition devices at three ends of the circuit in T-type connection are adopted, SCADA (supervisory control and data acquisition) measured data for the circuit in T-type connection under a plurality of load levels at multiple time intervals are imputed by the aid of a program, then a weighted least squares estimation model is solved to obtain estimated values of parameters of the circuit in T-type connection under one load level, namely a sample of estimation values, then a mean value of a plurality of samples of estimation values is calculated, coefficient variations of the samples are used as convergence tolerance of parameter estimation precision, and finally estimation values of the parameters of the circuit in T-type connection are obtained. By the aid of the parameter estimation method, the parameters of the circuit in T-type connection can be effectively estimated, and the parameter estimation method has the advantages of simplicity, quickcalculation speed, high estimation precision, good stability of data, high engineering practicality, convenience in popularization and application, and the like. In addition, the parameter estimationmethod can be widely applied to parameter estimation of optional electric power circuits which are in T-type connection and are provided with data acquisition devices.

Description

technical field [0001] The invention belongs to the field of power system line parameter identification and estimation technology, in particular to a parameter estimation method of a T-shaped connected power line based on SCADA (Supervisory Control and Data Acquisition, data acquisition and monitoring system) measurement data. Background technique [0002] Power line parameters are an important part of the basic data of the power grid, and their accuracy directly affects the accuracy of power system state estimation, fault analysis, stability analysis, and the effectiveness of online control and decision-making. T-shaped connecting lines are an important form of overhead lines in power systems, especially in power distribution networks. Due to the difficulty in implementing the measured line parameters during power failure, the parameters of the T-shaped connection line in the actual system use the design value or theoretical calculation value. However, due to the differenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R27/02
Inventor 张国连徐国钧刘永胜杨朝阳董志会胡晓琴颜伟高峰
Owner STATE GRID CORP OF CHINA
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