Identifying method of distribution parameters of transmission line

A transmission line and distributed parameter technology, which is applied in the field of identification of transmission line distributed parameters, can solve problems such as easy mutual influence, many parameters and measurements, and inability to identify zero-sequence parameters of the line

Active Publication Date: 2013-03-13
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU +1
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AI Technical Summary

Problems solved by technology

[0003] At present, there are two main methods for online parameter identification of lines. One is the parameter identification method based on steady-state data. This method is based on the online actual measurement of the monitoring and data acquisition system (SCADA) and the phasor acquisition unit (PMU) at both ends

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  • Identifying method of distribution parameters of transmission line
  • Identifying method of distribution parameters of transmission line
  • Identifying method of distribution parameters of transmission line

Examples

Experimental program
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Effect test

experiment example 1

[0234] Experimental example 1: Detection of the influence of the number of computing units j on the parameter identification accuracy

[0235] Due to the large distributed capacitance of high-voltage long lines, the distribution characteristics of the lines must be fully considered in practical applications. With the increase of the number j of calculation units in the mathematical model of the above-mentioned line distribution parameters, the distribution characteristics of the mathematical model are getting better and more accurate.

[0236] Considering the physical meaning of the equivalent resistance, inductance and capacitance of the unit length of the line, the initial value of the iteration is set as shown in Table 2:

[0237] Table 2 Set the initial value of line parameter iteration

[0238] R1c [Ω / km]

0.01

L1c[H / km]

1e-3

C1c[F / km]

1e-8

R0c[Ω / km]

0.5

L0c[H / km]

5e-3

C0c[F / km]

8e-9

[0239] Taking single-phas...

experiment example 2

[0245] Experimental example 2: Detection of changes in parameter identification accuracy when different types of faults occur and measurement data is disturbed

[0246] The line length l is taken as 300km, assuming that single-phase grounding, two-phase grounding, and single-phase disconnection faults occur on the line respectively, and Gaussian noise simulation measurement noise with a standard deviation of 5% is superimposed on the measurement data, and then the identification calculation is carried out. The initial value of iteration is shown in Table 5:

[0247] Table 5 sets the line parameter iteration initial value

[0248] R1c [Ω / km]

0.01

L1c[H / km]

1e-3

C1c[F / km]

1e-8

R0c[Ω / km]

0.5

L0c[H / km]

5e-3

C0c[F / km]

8e-9

[0249] Set the threshold ε 0 =1*10 -4 , taking j=20, the calculation results are shown in Table 6:

[0250] Table 6. The total length of the line is 300km, and the comparison of simulation resul...

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Abstract

The invention relates to an identifying method of distribution parameter of a transmission line. The method comprises the following steps: calculating a positive-sequence component and a zero-sequence component for a transmission line with external faults by collecting electric signal momentary values at the head and tail ends; and calculating positive-sequence distribution parameters: a resistor R1, an inducer L1 and a capacitor C1; then, calculating zero-sequence distribution parameters: a resistor R0, an inducer L0 and a capacitor C0. According to the invention, the line distribution parameters can be solved just by collecting voltage and current synchronous momentary values at both ends without the necessity to master parameters on both sides and operational states of other parts. The identifying precision of the method is not affected by fault condition, and the method has the advantages of simpleness and convenience in operation, and accurate calculation, and provides accurate line parameters for the power grid so as to ensure the reliability of calculation results of subsequent power system calculation such as state estimation, load flow calculation, fault location, and protection relay setting.

Description

technical field [0001] The invention relates to a method for identifying parameters of transmission lines, in particular to a method for identifying distribution parameters of transmission lines based on fault data. Background technique [0002] With the rapid development of my country's power grid construction, the scale of the power grid is gradually expanding, with wider distribution, more components, and more complex network structure. The stable and safe operation of the power grid is facing severe challenges. Accurate power grid model parameters are an important basis for power system calculations such as state estimation, power flow calculation, fault location, and relay protection setting. Improving its accuracy is of great significance to the safe operation of lines and systems. However, due to the influence of various factors such as terrain and climate, the line parameters will change, and the line parameters held by the power department are often inaccurate. Ther...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 卓华捷萧星华罗建郭威黄文兴潘桂昌陈炳堂陈炽锋何可敬刘伟东黄志军梁灿辉蔡国华王云龙阳武王建林汤淑芬姚冠明刘俊兴李俊
Owner GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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