阅读说明：本技术 一种基于电压波形衰减的过电压推演预测方法及装置 (Overvoltage deduction prediction method and device based on voltage waveform attenuation ) 是由 刘红文 于广辉 王科 赵现平 聂鼎 于 2019-10-30 设计创作，主要内容包括：本申请实施例示出一种基于电压波形衰减的过电压推演预测方法及装置,本申请实施例示出的技术方案通过测得雷击故障点两侧任意的两点的线路电压值,基于输电线路电压衰减的规律计算出雷击故障点的过电压数据。当输电线路受到雷击时,雷击故障点将会出现较大的过电压,并且该过电压行波会以某一衰减系数向线路两侧衰减传播,通过对线路上不同位置处电压的测量,计算出线路电压衰减系数以及推算出雷击点的过电压数据。由此,可以迅速确定线路雷击故障点的过电压数据,为输电线路防雷水平以及不同位置安装相应等级的避雷器参数提供相应的参考依据。(The embodiment of the application shows a voltage waveform attenuation-based overvoltage deduction prediction method and device. When the power transmission line is struck by lightning, a lightning stroke fault point can generate larger overvoltage, the overvoltage traveling wave can be attenuated and transmitted to the two sides of the line by a certain attenuation coefficient, and the voltage attenuation coefficient of the line is calculated and the overvoltage data of the lightning stroke point is calculated by measuring the voltages at different positions on the line. Therefore, the overvoltage data of the lightning stroke fault point of the line can be rapidly determined, and corresponding reference basis is provided for the lightning protection level of the power transmission line and the installation of lightning arrester parameters of corresponding levels at different positions.)

1. An overvoltage deduction prediction method based on voltage waveform decay, the method comprising:

Measuring line voltage values of different line monitoring points at two sides of a fault point;

Calculating a line voltage attenuation coefficient according to the line voltage value and the distance between corresponding monitoring points;

And calculating overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient.

2. The method according to claim 1, wherein the step of measuring the line voltage values of different line monitoring points on both sides of the fault point comprises the following steps:

when the power transmission line is struck by lightning, overvoltage occurs on the line and is transmitted to two sides of the line, and voltage values of different line monitoring points on two sides of a fault point are measured through voltage transformers on the line.

3. The method according to claim 1 or 2, wherein the step of calculating the line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points comprises:

where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₁₁Voltage data representing the voltage measured at the first monitoring point, in units of: kV; u shape₁voltage data representing the measured voltage at the second monitoring point, in units of: kV; l is₃Represents the distance between the first monitoring point and the second monitoring point, and the unit is: km, U₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₂₂Voltage data representing the voltage measured at the fourth monitoring point, in units of: kV; l is₄And the distance between the third monitoring point and the fourth monitoring point is represented, and the unit is: and km.

4. The method of claim 3, wherein the step of calculating the overvoltage data for the lightning strike point based on the line voltage value and the line voltage attenuation factor comprises:

where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₁representing voltage data measured at a second monitoring point; l represents the distance between the second monitoring point and the third monitoring point, in units of: km; l is₁And the distance between the second monitoring point and the lightning stroke fault point is represented as the following unit: km; l is₂And (3) representing the distance between the third monitoring point and the lightning stroke fault point, unit: km; u shape₀Overvoltage data representing the estimated lightning strike point, unit: kV.

5. An overvoltage deduction prediction device based on voltage waveform decay, the device comprising:

The test unit is used for measuring the line voltage values of different line monitoring points at two sides of a fault point;

The calculation unit is used for calculating a line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points;

And the computing unit is used for computing overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient.

6. The device according to claim 5, wherein the test unit is further configured to, when the power transmission line is struck by lightning, cause overvoltage to occur on the power transmission line and propagate the overvoltage to both sides of the power transmission line, and measure line voltage values of different line monitoring points on both sides of a fault point through voltage transformers on the control line.

7. The apparatus according to claim 5 or 6, wherein the estimation unit is configured to calculate the first line voltage attenuation coefficient and the second line voltage attenuation coefficient by:

where α represents a first line voltage attenuation coefficient, unit: km^-1(ii) a β represents a second line voltage attenuation coefficient, unit: km^-1；U₁₁voltage data representing the voltage measured at the first monitoring point, in units of: kV; u shape₁Voltage data representing the measured voltage at the second monitoring point, in units of: kV; l is₃Represents the distance between the first monitoring point and the second monitoring point, and the unit is: km, U₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₂₂Voltage data representing the voltage measured at the fourth monitoring point, in units of: kV; l is₄and the distance between the third monitoring point and the fourth monitoring point is represented, and the unit is: and km.

8. The apparatus according to claim 7, wherein the calculation process of the calculation unit is specifically:

where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₁representing voltage data measured at a second monitoring point; l represents the distance between the second monitoring point and the third monitoring point, in units of: km; l is₁And the distance between the second monitoring point and the lightning stroke fault point is represented as the following unit: km; l is₂And (3) representing the distance between the third monitoring point and the lightning stroke fault point, unit: km; u shape₀Overvoltage data representing the estimated lightning strike point, unit: kV.

Technical Field

The invention belongs to the technical field of lightning overvoltage monitoring of high-voltage transmission lines, and particularly relates to an overvoltage deduction prediction method and device based on voltage waveform attenuation.

background

The transmission line is an important component in the power system and is also a part directly connected with the power users, the operation condition of the transmission line is directly related to the experience of the users, and actually, because the transmission line is usually located outdoors, the transmission line is affected by various factors, and some faults can often occur to affect the normal operation of the transmission line.

Among many faults, lightning strikes are the most severe factor disrupting the operation of the power grid. When the power transmission line is struck by lightning, a lightning strike point generates large overvoltage, and the voltage is transmitted to two sides of the line, so that the line and operating equipment are influenced to a certain extent. Therefore, the research on the lightning system and the overvoltage monitoring are carried out, which is very important for improving the lightning protection level of the power transmission line and selecting the parameters for assembling the line arrester.

disclosure of Invention

The invention aims to provide an overvoltage deduction prediction method and device based on voltage waveform attenuation, and corresponding reference basis is provided for lightning protection levels of a power transmission line and lightning arrester parameters of corresponding levels installed at different positions.

A first aspect of the embodiments of the present application shows an overvoltage deduction prediction method based on voltage waveform decay, where the method includes:

Measuring line voltage values of different line monitoring points at two sides of a fault point;

Calculating a line voltage attenuation coefficient according to the line voltage value and the distance between corresponding monitoring points;

And calculating overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient.

optionally, the step of measuring the line voltage values of the different line monitoring points on the two sides of the fault point specifically includes:

When the power transmission line is struck by lightning, overvoltage occurs on the line and is transmitted to two sides of the line, and voltage values of different line monitoring points on two sides of a fault point are measured through voltage transformers on the line.

Optionally, the step of calculating the line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points specifically includes:

Where α represents a first line voltage attenuation coefficient, unit: km^-1(ii) a β represents a second line voltage attenuation coefficient, unit: km^-1；U₁₁Voltage data representing the voltage measured at the first monitoring point, in units of: kV; u shape₁Voltage data representing the measured voltage at the second monitoring point, in units of: kV; l is₃Represents the distance between the first monitoring point and the second monitoring point, and the unit is: km, U₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₂₂voltage data representing the voltage measured at the fourth monitoring point, in units of: kV; l is₄And the distance between the third monitoring point and the fourth monitoring point is represented, and the unit is: and km.

optionally, the step of calculating overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient specifically includes:

Where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₁Representing voltage data measured at a second monitoring point; l represents the distance between the second monitoring point and the third monitoring point, in units of: km; l is₁and the distance between the second monitoring point and the lightning stroke fault point is represented as the following unit: km; l is₂And (3) representing the distance between the third monitoring point and the lightning stroke fault point, unit: km; u shape₀overvoltage data representing the estimated lightning strike point, unit: kV.

A second aspect of the embodiments of the present application shows an overvoltage deduction prediction device based on voltage waveform decay, the device including:

the test unit is used for measuring the line voltage values of different line monitoring points at two sides of a fault point;

The calculation unit is used for calculating a line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points;

And the computing unit is used for computing overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient.

Optionally, when the power transmission line is struck by lightning, overvoltage occurs on the line and is transmitted to two sides of the line, and voltage values of different line monitoring points on two sides of a fault point are measured by a voltage transformer on the control line.

Optionally, the calculating unit is configured to calculate a first line voltage attenuation coefficient and a second line voltage attenuation coefficient, and the specific calculation process is as follows:

Where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₁₁Voltage data representing the voltage measured at the first monitoring point, in units of: kV; u shape₁Voltage data representing the measured voltage at the second monitoring point, in units of: kV; l is₃Represents the distance between the first monitoring point and the second monitoring point, and the unit is: km, U₂voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₂₂Voltage data representing the voltage measured at the fourth monitoring point, in units of: kV; l is₄And the distance between the third monitoring point and the fourth monitoring point is represented, and the unit is: and km.

Optionally, the calculation process of the calculation unit specifically includes:

Where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₁representing voltage data measured at a second monitoring point; l represents the distance between the second monitoring point and the third monitoring point, in units of: km; l is₁And the distance between the second monitoring point and the lightning stroke fault point is represented as the following unit: km; l is₂And (3) representing the distance between the third monitoring point and the lightning stroke fault point, unit: km; u shape₀Overvoltage data representing the estimated lightning strike point, unit: kV

As can be seen from the above technical solutions, an embodiment of the present application illustrates a method and an apparatus for predicting overvoltage deduction based on voltage waveform decay, where the method includes: measuring line voltage values of different line monitoring points at two sides of a fault point; calculating a line voltage attenuation coefficient according to the line voltage value and the distance between corresponding monitoring points; and calculating overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient. According to the technical scheme shown in the embodiment of the application, the overvoltage data of the lightning stroke fault point is calculated based on the rule of voltage attenuation of the power transmission line by measuring the line voltage values of any two points on two sides of the lightning stroke fault point. When the power transmission line is struck by lightning, a lightning stroke fault point can generate larger overvoltage, the overvoltage traveling wave can be attenuated and transmitted to the two sides of the line by a certain attenuation coefficient, and the voltage attenuation coefficient of the line is calculated and the overvoltage data of the lightning stroke point is calculated by measuring the voltages at different positions on the line. Therefore, the overvoltage data of the lightning stroke fault point of the line can be rapidly determined, and corresponding reference basis is provided for the lightning protection level of the power transmission line and the installation of lightning arrester parameters of corresponding levels at different positions.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a flow diagram illustrating a voltage waveform decay-based over-voltage deduction prediction method in accordance with a preferred embodiment;

FIG. 2 is a schematic diagram illustrating overvoltage deduction from lightning strike fault of a power transmission line according to a preferred embodiment;

Fig. 3 is a block diagram illustrating an overvoltage deduction prediction apparatus based on voltage waveform decay according to a preferred embodiment.

Illustration of the drawings: b denotes the position of the first monitoring point, A denotes the position of the second monitoring point, C denotes the position of the third monitoring point, D denotes the position of the fourth monitoring point, U₀Indicating overvoltage data for calculating lightning strike points, U₁Representing voltage data measured at a second monitoring point, U₂representing voltage data, U, measured at a third monitoring point₁₁Representing voltage data measured at a first monitoring point, U₂₂representing voltage data, L, measured at a fourth monitoring point₁Indicating the distance, L, between the second monitoring point and the lightning fault point₂indicating the distance, L, between the third monitoring point and the lightning fault point₃Indicating the distance between the first and second monitoring points, L₄Indicating the spacing of the third monitoring point from the fourth monitoring point.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

referring to fig. 1, a first aspect of the embodiments of the present application shows a method for predicting overvoltage deduction based on voltage waveform decay, where the method includes:

S101, measuring line voltage values of different line monitoring points on two sides of a fault point;

s102, calculating a line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points;

S103, calculating overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient.

Optionally, the step of measuring the line voltage values of the different line monitoring points on the two sides of the fault point specifically includes:

When the power transmission line is struck by lightning, overvoltage occurs on the line and is transmitted to two sides of the line, and voltage values of different line monitoring points on two sides of a fault point are measured through voltage transformers on the line.

Referring to fig. 2, the step of calculating the line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points specifically includes:

The voltage values U11, U1, U2 and U22 of the four points of the ABCD line can be measured through a line voltage transformer.

where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₁₁Voltage data representing the voltage measured at the first monitoring point, in units of: kV; u shape₁Voltage data representing the measured voltage at the second monitoring point, in units of: kV; l is₃Represents the distance between the first monitoring point and the second monitoring point, and the unit is: km, U₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₂₂Voltage data representing the voltage measured at the fourth monitoring point, in units of: kV; l is₄And the distance between the third monitoring point and the fourth monitoring point is represented, and the unit is: and km.

Referring to fig. 2, the step of calculating the overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient includes:

where α represents a first line voltage attenuation coefficient, unit: kV/km(ii) a β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₁Representing voltage data measured at a second monitoring point; l represents the distance between the second monitoring point and the third monitoring point, in units of: km; l is₁And the distance between the second monitoring point and the lightning stroke fault point is represented as the following unit: km; l is₂and (3) representing the distance between the third monitoring point and the lightning stroke fault point, unit: km; u shape₀Overvoltage data representing the estimated lightning strike point, unit: kV.

Referring to fig. 3, a second aspect of the embodiments of the present application shows an overvoltage deduction prediction device based on voltage waveform decay, the device including:

The test unit 21 is used for measuring the line voltage values of different line monitoring points at two sides of a fault point;

The calculation unit 22 is used for calculating a line voltage attenuation coefficient according to the line voltage value and the distance between the corresponding monitoring points;

And the calculating unit 23 is configured to calculate overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient.

Optionally, when the power transmission line is struck by lightning, overvoltage occurs on the line and is transmitted to two sides of the line, and voltage values of different line monitoring points on two sides of a fault point are measured by a voltage transformer on the control line.

Optionally, the calculating unit is configured to calculate a first line voltage attenuation coefficient and a second line voltage attenuation coefficient, and the specific calculation process is as follows:

where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₁₁Voltage data representing the voltage measured at the first monitoring point, in units of: kV; u shape₁Voltage data representing the measured voltage at the second monitoring point, in units of: kV; l is₃Represents the distance between the first monitoring point and the second monitoring point, and the unit is: km, U₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₂₂Voltage data representing the voltage measured at the fourth monitoring point, in units of: kV; l is₄And the distance between the third monitoring point and the fourth monitoring point is represented, and the unit is: and km.

optionally, the calculation process of the calculation unit specifically includes:

Where α represents a first line voltage attenuation coefficient, unit: kV/km; β represents a second line voltage attenuation coefficient, unit: kV/km; u shape₂Voltage data representing the measurement of the third monitoring point, in units of: kV; u shape₁Representing voltage data measured at a second monitoring point; l represents the distance between the second monitoring point and the third monitoring point, in units of: km; l is₁and the distance between the second monitoring point and the lightning stroke fault point is represented as the following unit: km; l is₂And (3) representing the distance between the third monitoring point and the lightning stroke fault point, unit: km; u shape₀Overvoltage data representing the estimated lightning strike point, unit: kV

as can be seen from the above technical solutions, an embodiment of the present application illustrates a method and an apparatus for predicting overvoltage deduction based on voltage waveform decay, where the method includes: measuring line voltage values of different line monitoring points at two sides of a fault point; calculating a line voltage attenuation coefficient according to the line voltage value and the distance between corresponding monitoring points; and calculating overvoltage data of the lightning strike point according to the line voltage value and the line voltage attenuation coefficient. According to the technical scheme shown in the embodiment of the application, the overvoltage data of the lightning stroke fault point is calculated based on the rule of voltage attenuation of the power transmission line by measuring the line voltage values of any two points on two sides of the lightning stroke fault point. When the power transmission line is struck by lightning, a lightning stroke fault point can generate larger overvoltage, the overvoltage traveling wave can be attenuated and transmitted to the two sides of the line by a certain attenuation coefficient, and the voltage attenuation coefficient of the line is calculated and the overvoltage data of the lightning stroke point is calculated by measuring the voltages at different positions on the line. Therefore, the overvoltage data of the lightning stroke fault point of the line can be rapidly determined, and corresponding reference basis is provided for the lightning protection level of the power transmission line and the installation of lightning arrester parameters of corresponding levels at different positions.

other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.