CN-122020593-A - Wire equivalent icing characteristic quantity measuring method and system

CN122020593ACN 122020593 ACN122020593 ACN 122020593ACN-122020593-A

Abstract

The invention belongs to the technical field of electric power monitoring, and relates to a method and a system for measuring equivalent icing characteristic quantity of a wire. The method comprises the steps of collecting real-time state data of a wire, removing high-frequency noise interference, obtaining a temperature correction tension value through temperature correction, carrying out frequency domain analysis, identifying main frequency of vibration of the wire, carrying out filtering treatment to obtain a static correction tension value, establishing a mechanical balance equation of stress of the wire, determining the icing weight of the wire, establishing a correlation model of the equivalent icing thickness and the icing weight of the wire, and calculating to obtain the equivalent icing thickness of the wire. The invention obviously improves the stability of ice coating monitoring under the conditions of large day and night temperature difference or extreme air temperature, effectively avoids the interference of wind load on the calculation of ice coating weight and greatly reduces the false alarm rate.

Inventors

CUI ZHISHENG
DU YINGKUN
DUAN YUE
ZHOU RONGQIANG
HUANG JIE

Assignees

盐源蜀道清洁能源有限公司
四川欣智造科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260202

Claims (10)

1. The method for measuring the equivalent icing characteristic quantity of the wire is characterized by comprising the following steps of: The method comprises the steps of collecting real-time state data of a wire, wherein the real-time state data comprise an idle tension value, an original tension value, environmental temperature data, environmental humidity data and wire vibration acceleration data which are received by the wire; preprocessing the real-time state data to remove high-frequency noise interference; Carrying out temperature correction on the original tension value by using a physical model of thermal expansion and contraction of the lead to obtain a temperature correction tension value; frequency domain analysis is carried out on the preprocessed wire vibration acceleration data, the main frequency of wire vibration is identified, a filter is designed according to the main frequency of wire vibration to carry out filtering treatment on the temperature correction tension value, and dynamic vibration components are removed to obtain a static correction tension value; establishing a mechanical balance equation of the stress of the wire, and determining the icing weight of the wire according to the static correction tension value and the no-load tension value; Combining physical parameters of the wire, and establishing a correlation model of equivalent icing thickness and icing weight of the wire; And calculating the equivalent icing thickness of the wire according to the icing weight of the wire and the correlation model.
2. The method for measuring the equivalent icing characteristic quantity of the wire according to claim 1 is characterized in that a low-pass filter is adopted to carry out smoothing processing on an original tension value, ambient temperature data and ambient humidity data, and a trend removal item processing method is adopted to carry out zero drift correction on a wire vibration acceleration signal.
3. The method for measuring the equivalent icing characteristic quantity of the wire according to claim 1, wherein the temperature correction is performed on the original tension value by using a physical model of thermal expansion and cold contraction of the wire to obtain a temperature correction tension value, comprising the following steps: Setting the temperature correction tension value as The original measurement tensile force at the reference temperature is The reference temperature is The actual temperature is The elastic modulus of the wire is The cross-sectional area of the wire is The linear expansion coefficient of the wire is The temperature correction tension value is: 。
4. The method for measuring the equivalent icing characteristic quantity of the wire according to claim 1, wherein the method for measuring the equivalent icing characteristic quantity of the wire is characterized by carrying out frequency domain analysis on the preprocessed wire vibration acceleration data, identifying the main frequency of wire vibration, designing a filter according to the main frequency of wire vibration to carry out filtering treatment on a temperature correction tension value, removing dynamic vibration components and obtaining a static correction tension value, and comprises the following steps: Performing fast Fourier transform on acceleration data in the vertical direction and the horizontal direction of the lead to obtain an acceleration frequency spectrum; Searching a peak value with the largest amplitude in the acceleration frequency spectrum, and determining the frequency corresponding to the peak value as the main frequency of the vibration of the lead; Setting a cut-off bandwidth by taking a main frequency of wire vibration as a central frequency, and designing a digital band-stop filter; and inputting the temperature correction tension value into a digital band elimination filter, filtering tension fluctuation components corresponding to the main frequency of the wire vibration, and outputting a static correction tension value.
5. The method for measuring the equivalent icing characteristic quantity of the wire according to claim 4, wherein the method for performing fast fourier transform on acceleration data in the vertical direction and the horizontal direction of the wire to obtain an acceleration frequency spectrum comprises the following steps: Let the acceleration data be , The fast fourier transform is represented by a set of coefficients, For the acceleration spectrum, the acceleration spectrum is expressed as: 。
6. The method for measuring the equivalent icing characteristic of a wire according to claim 1, wherein establishing a mechanical equilibrium equation of the stress of the wire comprises: setting the static correction tension value as The no-load tension value is The rigidity coefficient of the system is Then: 。
7. the method for measuring the equivalent icing characteristic quantity of the wire according to claim 1, wherein the step of establishing a correlation model of the equivalent icing thickness and the icing weight of the wire comprises the following steps: Is provided with For the wire diameter, In order for the thickness of the ice to be coated, For the length of the wire, In order to achieve the ice-on density, For the density of the wires to be the same, For the ice coating weight, the correlation model is expressed as: 。
8. The method for measuring the equivalent icing characteristic of the wire according to claim 1, wherein the wire no-load reference tension is an average value of a temperature correction tension value and a static correction tension value in a historical icing-free state.
9. The method for measuring the equivalent icing characteristic quantity of the wire according to claim 1 is characterized by comprising the steps of collecting an empty tension value and an original tension value of the wire by using a tension sensor, collecting environmental temperature data and environmental humidity data by using a temperature and humidity sensor, and collecting vibration acceleration data of the wire by using an acceleration sensor.
10. The wire equivalent icing characteristic quantity measurement system is characterized by comprising an acquisition unit, a preprocessing unit, a first correction unit, a second correction unit, a first processing unit, a correlation model building unit and an output unit; The device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring real-time state data of a wire, and the real-time state data comprise an idle tension value, an original tension value, environment temperature data, environment humidity data and wire vibration acceleration data which are received by the wire; The preprocessing unit is used for preprocessing the real-time state data and removing high-frequency noise interference; The first correction unit is used for carrying out temperature correction on the original tension value by utilizing the thermal expansion and contraction physical model of the lead to obtain a temperature correction tension value; The second correction unit is used for carrying out frequency domain analysis on the preprocessed wire vibration acceleration data, identifying the main frequency of wire vibration, designing a filter according to the main frequency of wire vibration to carry out filtering treatment on the temperature correction tension value, and removing dynamic vibration components to obtain a static correction tension value; The first processing unit is used for establishing a mechanical balance equation of the stress of the wire and determining the icing weight of the wire according to the static correction tension value and the no-load tension value; the correlation model building unit is used for building a correlation model of equivalent icing thickness and icing weight of the wire by combining physical parameters of the wire; and the output unit is used for calculating the equivalent icing thickness of the wire according to the icing weight of the wire and the correlation model.

Description

Wire equivalent icing characteristic quantity measuring method and system Technical Field The invention belongs to the technical field of electric power monitoring, and particularly relates to a method and a system for measuring equivalent icing characteristic quantity of a wire. Background The power grid construction scale is continuously enlarged, the extra-high voltage and ultra-high voltage power transmission lines are increasingly increased, and the path selection is often required to pass through high-altitude and microclimate complicated alpine mountain areas. In winter, the power transmission wire is extremely easy to be covered with ice in low temperature, high humidity and freezing rain. Wire icing is a major safety hazard in the operation of power systems, and the hazard is mainly manifested in the following aspects: Firstly, mechanical load is overloaded, vertical load of a wire can be obviously increased by icing, when the thickness of the icing exceeds a design standard, the wire is broken and broken due to huge ice weight, even serious accidents such as pole tower collapse and hardware damage are caused, the icing can cause insulator string ice flash to cause line tripping and line electrical performance reduction, meanwhile, the sag is increased after the wire is covered, the safety distance to the ground or crossing object is possibly insufficient, discharge accidents are caused, even wire galloping is caused, aerodynamic instability is caused by the icing in an asymmetric shape under the action of wind force, and serious fatigue damage is caused to the hardware, insulators and pole towers due to severe vibration, even interphase short circuit is caused. In order to cope with icing disasters, the icing state of a line needs to be mastered in real time, and the existing monitoring method mainly comprises manual inspection, optical image monitoring and mechanical sensor monitoring. The method is characterized in that a single tension sensor monitors measuring tension force by installing a weighing sensor at a hanging point of an insulator string, and then reversely pushes ice weight, the method ignores temperature influence, a metal wire has thermal expansion and contraction characteristics, environmental temperature change can lead to wire length expansion and further lead to tension confusion significant change, simple tension change can lead to temperature effect and icing gravity effect, lead to icing error under ice-free low temperature, in addition, the method ignores dynamic interference, the wire can generate wind vibration or vibration under the action of wind power, the output of the tension sensor is a signal containing dynamic components, and the method can simplify transient value calculation and directly calculate and lead to weather error increase due to the fact that the tension is excessively high. Therefore, a wire equivalent icing characteristic quantity measuring method capable of comprehensively considering multi-source influence factors such as ambient temperature, wire vibration and the like is urgently needed, so that accuracy and reliability of monitoring data are improved, and accurate data support is provided for ice melting decision of a power grid. Disclosure of Invention In order to solve the technical problems, the invention provides a method and a system for measuring the equivalent icing characteristic quantity of a wire. In a first aspect, the invention provides a method for measuring an equivalent icing characteristic of a wire, which comprises the following steps: The method comprises the steps of collecting real-time state data of a wire, wherein the real-time state data comprise an idle tension value, an original tension value, environmental temperature data, environmental humidity data and wire vibration acceleration data which are received by the wire; preprocessing the real-time state data to remove high-frequency noise interference; Carrying out temperature correction on the original tension value by using a physical model of thermal expansion and contraction of the lead to obtain a temperature correction tension value; frequency domain analysis is carried out on the preprocessed wire vibration acceleration data, the main frequency of wire vibration is identified, a filter is designed according to the main frequency of wire vibration to carry out filtering treatment on the temperature correction tension value, and dynamic vibration components are removed to obtain a static correction tension value; establishing a mechanical balance equation of the stress of the wire, and determining the icing weight of the wire according to the static correction tension value and the no-load tension value; Combining physical parameters of the wire, and establishing a correlation model of equivalent icing thickness and icing weight of the wire; And calculating the equivalent icing thickness of the wire according to the icing weight of the wire and the correlation model