CN112098781A - MATLAB/Simulink technology-based high-voltage cable partial discharge signal transmission model establishment method - Google Patents
MATLAB/Simulink technology-based high-voltage cable partial discharge signal transmission model establishment method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention relates to a method for establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology, which is characterized by comprising the following steps: the method comprises the following specific steps: (1) selecting a partial discharge signal; (2) selecting a cable model; (3) and establishing a cable partial discharge signal simulation model circuit. The partial discharge signal is usually simulated by a dual-exponential oscillation attenuation model (DEAOW), a Distributed parameters line in Simulink is selected as a line model, and the distribution parameters are changed: resistance per unit length R0Inductor L0Capacitor C0And leakage conductance G0And changing the model of the cable. The invention provides a cable partial discharge detection partial discharge signal detection method, which aims to solve the problems that the partial discharge signal of the existing cable partial discharge detection is influenced by the length of a cable, the model of the cable and the frequency of the partial discharge signal, a 220kV high-voltage cable partial discharge signal transmission model is few and the likeThe method for establishing the high-voltage cable partial discharge signal transmission model based on the MATLAB/Simulink technology deeply researches the cable partial discharge transmission characteristic, ensures the accuracy of partial discharge detection, ensures the normal operation of the cable, and further improves the continuity and reliability of power supply and distribution of a power system.
Description
Technical Field
The invention relates to the technical field of high-voltage cable discharge signal processing, in particular to a method for establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology.
Background
With the rapid development of economy in China, the urbanization scale is continuously enlarged, and the electricity consumption is continuously increased. In big cities with a large population, the use amount of high-voltage cables is gradually increased due to the advantages of small occupied area, high safety and reliability, city environment optimization and the like. By 2012, the total length of the cable line for the national grid company system running 6-500 kv was 312441 km.
With the wide application of power cables and the rapid development towards higher voltage levels, insulation aging and fault accidents caused by factors such as electricity, heat, machinery, chemistry and the like of cables with longer operation time are rare, and show an increasing trend, and seriously threaten the safe and reliable operation of a power system. Once the underground cable breaks down, the finding and digging are very difficult, a large amount of manpower and material resources are wasted, power failure loss which is difficult to estimate is caused, and a great negative effect is caused to other industries and daily life of people, so that serious economic loss and social influence are caused. Therefore, the research on the cable state monitoring method plays a key role in prolonging the service life of the cable and enhancing the operation reliability of the cable.
At the initial stage of various faults of the cable, the charge distribution in the cable can be changed due to the change of the whole cable or an insulation structure, and the field intensity of certain parts is larger. Under the action of the electric field, partial discharge occurs in a partial area of a cable insulation system, and the partial discharge amount of the power cable is closely related to the insulation condition of the power cable, so that a cable detection method based on the partial discharge is widely applied.
With the application of cable partial discharge detection, the problem that a cable partial discharge signal is influenced by the length of a cable, the model of the cable and the frequency of the partial discharge signal is increasingly prominent, so that a method for researching the transmission characteristic of the cable partial discharge signal must be found.
The method is used for researching the transmission characteristics of the partial discharge signals of the 220kV high-voltage cable, establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink, and researching the influence of the length, the model and the partial discharge signal frequency of the cable on the partial discharge signal transmission so as to provide a technical scheme for the partial discharge detection research of the cable.
Disclosure of Invention
Aiming at the problems that the existing cable partial discharge detection partial discharge signal is influenced by the cable length, the cable model and the partial discharge signal frequency, and a 220kV high-voltage cable partial discharge signal transmission model is few, the invention provides a high-voltage cable partial discharge signal transmission model establishing method based on MATLAB/Simulink technology, which deeply researches the cable partial discharge transmission characteristic, ensures the partial discharge detection accuracy, ensures the normal operation of a cable, and further improves the continuity and reliability of power supply and distribution of a power system.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology comprises the following specific steps:
(1) partial discharge signal selection
Simulating a partial discharge signal by using a double-exponential oscillation attenuation model DEOW, wherein the mathematical expression is as follows:
f(t)＝A(e-1.3t/τ-e-2.2t/τ)sin(2πfct) (1)
wherein: a is the partial discharge pulse amplitude;
τ is the attenuation coefficient;
fcis the oscillation frequency;
t is time;
(2) cable model selection
The Distributed parameters line in Simulink is selected as a line model, and the distribution parameters are changed: resistance per unit length R0Inductor L0Capacitor C0And leakage conductance G0The model of the cable is changed, and the equivalent model and parameters of the cable are set as follows:
wherein D isAIs the diameter of the cable shielding layer;
DCis the cable core diameter;
is the relative dielectric constant of the material;
0is a vacuum dielectric constant;
μ0is magnetic permeability;
Li、Lerespectively an internal inductor and an external inductor;
rho is the resistivity of the wire material;
(3) cable partial discharge signal simulation model circuit establishment
A cable partial discharge signal simulation model circuit is built based on Simulink.
And, DAIs the cable outer diameter of the cable shielding layer.
And, DCThe inner diameter of the cable core.
The cable partial discharge signal simulation model circuit comprises a clock signal, a function module, a controlled voltage source, a cable, a sampling resistor, a voltage measurement module and an oscilloscope, wherein the clock signal is connected with the function module, one path of the function module is connected with the oscilloscope, the other path of the function module is connected with the controlled voltage source, the anode of the controlled voltage source is connected with the anode of the cable, the cathode of the controlled voltage source is connected with a ground wire of the cathode of the controlled voltage source, the cathode of the cable is connected with the anode of the voltage measurement module, the cathode of the voltage measurement module is connected with the cathode end.
And the analysis tool of the cable partial discharge signal simulation model circuit is Discrete, and s is 1 e-08.
And the negative pole of the sampling resistor is grounded.
The invention has the advantages and positive effects that:
the method is used for researching the transmission characteristics of the partial discharge signals of the 220kV high-voltage cable, establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink, and researching the influence of the length, the model and the partial discharge signal frequency of the cable on the partial discharge signal transmission so as to provide a technical scheme for the partial discharge detection research of the cable.
Aiming at the problems that the existing cable partial discharge detection partial discharge signal is influenced by the cable length, the cable model and the partial discharge signal frequency, and a 220kV high-voltage cable partial discharge signal transmission model is few, the invention provides a high-voltage cable partial discharge signal transmission model establishing method based on MATLAB/Simulink technology, which deeply researches the cable partial discharge transmission characteristic, ensures the partial discharge detection accuracy, ensures the normal operation of the cable, and further improves the power supply and distribution continuity and reliability of a power system.
Drawings
Fig. 1 is a dual-exponential oscillation attenuation model of a partial discharge signal;
FIG. 2 is an equivalent simulation model of a high voltage cable;
FIG. 3 is a parameter setting module;
FIG. 4 is a simulation model;
FIG. 5 shows the variation of the amplitude of the partial discharge signal with the length;
FIG. 6 is a partial discharge signal waveform for a 1km cable;
FIG. 7 is a partial discharge signal amplitude as a function of cable nominal cross-section;
FIG. 8 is a 1000mm drawing2A cable partial discharge signal waveform;
fig. 9 shows that the amplitude of the partial discharge signal varies with the frequency of the partial discharge signal;
fig. 10 is a 1MHz cable partial discharge signal waveform.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A method for establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology comprises the following specific steps:
(1) partial discharge signal selection
The partial discharge signal is a narrow pulse signal having a steep rising edge and containing various high frequency components. The frequency range in which the high frequency components are mainly concentrated is 1kHz-100MHz, and the higher the frequency, the more severe the attenuation thereof when propagating in the power cable will be. The partial discharge signal is usually simulated by a dual-exponential oscillation attenuation model (DEAOW), and the mathematical expression thereof is as follows:
f(t)＝A(e-1.3t/τ-e-2.2t/τ)sin(2πfct) (1)
wherein: a is the partial discharge pulse amplitude; τ is the attenuation coefficient; f. ofcIs the oscillation frequency; t is time.
The waveform of the double-exponential oscillation attenuation model is shown in fig. 1.
(2) Cable model selection
The Distributed parameters line in Simulink is selected as a line model, and the distribution parameters are changed: resistance per unit length R0Inductor L0Capacitor C0And leakage conductance G0And changing the model of the cable. The cable equivalent model and parameter setting module are shown in fig. 2 and 3.
Wherein D isAFor the diameter (i.e. outer diameter), D, of the cable shieldCIs the cable core diameter (i.e., inner diameter); is the relative dielectric constant of the material;0is a vacuum dielectric constant; mu.s0Is magnetic permeability; l isi、LeRespectively an internal inductor and an external inductor; ρ is the resistivity of the wire material.
(3) Cable partial discharge signal simulation model establishment
A cable partial discharge signal simulation model is built based on Simulink, a partial discharge signal is injected from a point A at one end of a cable, a signal waveform coming out from a point B at the other end of the cable is observed and is compared with an original signal waveform for analysis, and the simulation model is shown in figure 4.
The cable partial discharge signal simulation model circuit comprises a clock signal, a function module, a controlled voltage source, a cable, a sampling resistor, a voltage measurement module and an oscilloscope, wherein the clock signal is connected with the function module, one path of the function module is connected with the oscilloscope, the other path of the function module is connected with the controlled voltage source, the positive pole of the controlled voltage source is connected with the positive pole of the cable, the negative pole of the controlled voltage source is connected with the ground wire of the negative pole of the controlled voltage source, the negative pole of the cable is connected with the positive pole of the voltage measurement module, the negative pole of the.
The analysis tool of the cable partial discharge signal simulation model circuit is Discrete, and s is 1 e-08.
And the negative electrode of the sampling resistor is grounded.
(4) Influence of cable length on partial discharge signal transmission characteristics
When the cable modules Line length are set to be different, the partial discharge signal amplitude is as shown in fig. 5. From fig. 5, it is known that as the length of the cable increases, the amplitude of the partial discharge signal is attenuated continuously, the attenuation speed is reduced gradually, and the partial discharge waveform at 1km of the cable is as shown in fig. 6.
(5) Influence of cable model on partial discharge signal transmission characteristics
And (3) calculating the distribution parameters of the cables according to a formula (2) by taking the 220kV YJLW-03 type cables as a model, and analyzing the change condition of partial discharge signals when the nominal sections of the cables are different. When the nominal cross section of the cable is different, the amplitude of the partial discharge signal changes as shown in fig. 7, and the nominal cross section is 1000mm2The cable partial discharge waveform of (a) is shown in fig. 8.
(6) Influence of partial discharge signal frequency on transmission characteristics
When the frequency of the partial discharge signal is different, the amplitude of the partial discharge signal changes as shown in fig. 9. It is known from the figure that as the partial discharge signal of the cable increases, the amplitude of the partial discharge signal is attenuated continuously, and the attenuation speed is reduced gradually. The waveform of the partial discharge signal with the frequency of 1MHz is shown in fig. 10.
The method is used for researching the transmission characteristics of the partial discharge signals of the 220kV high-voltage cable, establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink, and researching the influence of the length, the model and the partial discharge signal frequency of the cable on the partial discharge signal transmission so as to provide a technical scheme for the partial discharge detection research of the cable.
Aiming at the problems that the existing cable partial discharge detection partial discharge signal is influenced by the cable length, the cable model and the partial discharge signal frequency, and a 220kV high-voltage cable partial discharge signal transmission model is few, the invention provides a high-voltage cable partial discharge signal transmission model establishing method based on MATLAB/Simulink technology, which deeply researches the cable partial discharge transmission characteristic, ensures the partial discharge detection accuracy, ensures the normal operation of the cable, and further improves the power supply and distribution continuity and reliability of a power system.
Although the embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that: various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and therefore the scope of the invention is not limited to the embodiments disclosed.
Claims (6)
1. A method for establishing a high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology is characterized by comprising the following steps: the method comprises the following specific steps:
(1) partial discharge signal selection
Simulating a partial discharge signal by using a double-exponential oscillation attenuation model DEOW, wherein the mathematical expression is as follows:
f(t)＝A(e-1.3t/τ-e-2.2t/τ)sin(2πfct) (1)
wherein: a is the partial discharge pulse amplitude;
τ is the attenuation coefficient;
fcis the oscillation frequency;
t is time;
(2) cable model selection
The Distributed parameters line in Simulink is selected as a line model, and the distribution parameters are changed: resistance per unit length R0Inductor L0Capacitor C0And leakage conductance G0The model of the cable is changed, and the equivalent model and parameters of the cable are set as follows:
wherein D isAIs the diameter of the cable shielding layer;
DCis the cable core diameter;
is the relative dielectric constant of the material;
0is a vacuum dielectric constant;
μ0is magnetic permeability;
Li、Lerespectively an internal inductor and an external inductor;
rho is the resistivity of the wire material;
(3) cable partial discharge signal simulation model circuit establishment
A cable partial discharge signal simulation model circuit is built based on Simulink.
2. A method according to claim 1The method for establishing the high-voltage cable partial discharge signal transmission model of the MATLAB/Simulink technology is characterized by comprising the following steps of: dAIs the cable outer diameter of the cable shielding layer.
3. The method for establishing the high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology according to claim 1, wherein the method comprises the following steps: dCThe inner diameter of the cable core.
4. The method for establishing the high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology according to claim 1, wherein the method comprises the following steps: the cable partial discharge signal simulation model circuit comprises a clock signal, a function module, a controlled voltage source, a cable, a sampling resistor, a voltage measurement module and an oscilloscope, wherein the clock signal is connected with the function module, one path of the function module is connected with the oscilloscope, the other path of the function module is connected with the controlled voltage source, the positive pole of the controlled voltage source is connected with the positive pole of the cable, the negative pole of the controlled voltage source is connected with the ground wire of the negative pole of the controlled voltage source, the negative pole of the cable is connected with the positive pole of the voltage measurement module, the negative pole of the.
5. The method for establishing the high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology according to claim 1 or 4, wherein the method comprises the following steps: the analysis tool of the cable partial discharge signal simulation model circuit is Discrete, and s is 1 e-08.
6. The method for establishing the high-voltage cable partial discharge signal transmission model based on MATLAB/Simulink technology according to claim 4, wherein the method comprises the following steps: and the negative electrode of the sampling resistor is grounded.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702783A (en) * | 2021-08-27 | 2021-11-26 | 陕西省地方电力（集团）有限公司 | Cable partial discharge detection method, system, equipment and medium |
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| AU8887798A (en) * | 1997-09-02 | 1999-03-22 | Hitachi Chemical Company, Ltd. | Method and system for approximating distributed constant line |
| CN109085481A (en) * | 2018-10-23 | 2018-12-25 | 国网江苏省电力有限公司徐州供电分公司 | A kind of cable local discharge localization method based on EWT |
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| CN113702783A (en) * | 2021-08-27 | 2021-11-26 | 陕西省地方电力（集团）有限公司 | Cable partial discharge detection method, system, equipment and medium |
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Application publication date: 20201218 |