CN-122000846-A - Mountain wind power lightning protection maintenance integrated system and lightning protection and quick positioning method

CN122000846ACN 122000846 ACN122000846 ACN 122000846ACN-122000846-A

Abstract

The mountain wind power lightning protection and overhaul integrated system comprises a micro-sensing unit, a grounding grid sensing unit, a lightning protection line protection blind area, an auxiliary interception unit, a grounding resistance reduction unit and a pole tower edge calculation unit, wherein the micro-sensing unit is used for collecting lightning current amplitude and arrival time when a lightning stroke occurs, the grounding grid sensing unit is used for monitoring instantaneous resistance change, inflow current and resistance reduction state of the grounding module, the lightning protection line protection unit is used for adjusting the position of the lightning line in a two-dimensional mode, the auxiliary interception unit is used for covering the lightning protection blind area, the grounding resistance reduction unit is used for increasing the ground conductivity, and the pole tower edge calculation unit is used for synchronizing clocks, processing data and calculating the coordinates of the lightning stroke point and is connected with the micro-sensing unit through the lightning line. The application can reduce the lightning strike risk of the mountain wind power transmission line and improve the maintenance efficiency.

Inventors

ZHAO WENBIN
CAO DONGMEI
Zhou Haofu
LUO GUANGYUAN
GAO FENG
ZHANG JING
CHENG JIAOJIAO
XU KEYI

Assignees

三峡新能源(凤凰)发电有限公司

Dates

Publication Date: 20260508
Application Date: 20260126

Claims (10)

1. Mountain region wind-powered electricity generation lightning protection overhauls integration system, its characterized in that includes: the micro-sensing unit is integrated at the segment joint of the lightning conductor and is used for collecting the lightning current amplitude and the arrival time when lightning strikes; The grounding grid sensing unit is embedded into the terrain anchoring grounding module of the mountain wind power pole tower and is used for monitoring the instantaneous resistance change, inflow current and resistance reduction state of the grounding module; The lightning conductor protection unit is arranged at the top of the tower and used for adjusting the position of the lightning conductor in a two-dimensional manner; The auxiliary interception unit is deployed in the middle of the large-span line and is used for covering a lightning protection dead zone; The grounding resistance reducing unit is integrally designed with the grounding module and is used for increasing the conductivity of the land, and comprises an electromagnetic control valve which is in signal connection with the grounding grid sensing unit and is used for adjusting the opening and closing of the electromagnetic control valve according to the change of the grounding resistance; The tower edge calculating unit is arranged below the wind power tower cross arm and used for synchronizing clocks, processing data and calculating lightning stroke point coordinates, and is connected with the micro-sensing unit through a lightning conductor.
2. The mountain wind power lightning protection and overhaul integrated system according to claim 1, wherein the micro-sensing unit comprises a current transformer and a high-precision clock chip, the current transformer is used for collecting lightning current amplitude when lightning strikes, and the high-precision clock chip is used for recording lightning current arrival time.
3. The integrated system for mountain wind power lightning protection and overhaul as set forth in claim 1, wherein the ground grid sensing unit comprises a dual sensing chip welded on the copper electrode of the ground module, and the dual sensing chip is used for collecting instantaneous resistance change and inflow current of the ground module during lightning strike.
4. The mountain wind power lightning protection and overhaul integrated system according to claim 1, wherein the tower edge computing unit comprises a dual-mode clock module and a data processing module, the dual-mode clock module is used for providing clock synchronization for the micro-sensing unit and the grounding grid sensing unit, and the data processing module is used for receiving lightning current amplitude and time data of the micro-sensing unit, resistance and current data of the grounding grid sensing unit and running a fusion algorithm to compute lightning stroke point coordinates.
5. The mountain wind power lightning protection and overhaul integrated system according to claim 1, wherein the lightning protection unit comprises an electric bracket and a thunderstorm direction sensor, the electric bracket is arranged at the end part of a tower cross arm and is used for horizontally rotating and vertically lifting the lightning protection wire, and the thunderstorm direction sensor is integrated at the top of the bracket and is used for detecting the incoming thunderstorm direction.
6. The integrated system for mountain wind power lightning protection and overhaul as set forth in claim 1, wherein the auxiliary interception unit comprises a composite interception net, a furling driver and a double-support-column sliding rope mechanism; The double-support column sliding rope mechanism is arranged between two adjacent towers and comprises two support columns which are arranged at intervals, and a sliding rope with a gradient is formed between the top ends of the two support columns; The top of higher support column is equipped with sealed receiver, the roll-up driver with compound interception net is arranged in the receiver, compound interception net can be followed the smooth cable expansion to through roll-up driver rolling.
7. The mountain wind power lightning protection and overhaul integrated system is characterized in that the grounding resistance reduction unit comprises a porous ceramic shell, a composite resistance reduction medium and an electromagnetic control valve, the porous ceramic shell and a grounding module copper electrode are coaxially nested, the composite resistance reduction medium is filled between the porous ceramic shell and the grounding module copper electrode, and the electromagnetic control valve is controlled to be opened and closed by a pole tower edge computing unit and used for rapidly dissolving the composite resistance reduction medium.
8. The mountain wind power lightning protection maintenance integrated system of claim 4, wherein the fusion algorithm of the data processing module comprises the following steps: S1, receiving the arrival time of lightning current of adjacent lightning conductor microsensor units 、 Calculating the time difference The distance from the lightning strike point to one of the micro-sensing units is calculated initially in combination with the propagation velocity v=2.5x 8 m/s ; S2, receiving current of adjacent tower grounding grid sensing units 、 Resistance change 、 By means of And (3) with / Ratio correction of (2) Obtaining ; S2.1, monitoring soil resistivity data of the submodule in combination with the resistance-reduction state, if the resistivity is more than 1000 omega M, pair of The ratio is corrected by 1.2 to 1.5 times; S3, elevation data based on pole tower 、 And a horizontal distance D between the two poles, calculating a gradient correction coefficient k= Further obtain the actual distance after gradient correction = ×K; S4, based on the physical characteristic parameters of the wire, namely the unit weight g and the tension T, passing through a sag formula Calculating the sag of the lightning strike point, and finally according to 、、 And D, calculating the three-dimensional coordinates of the lightning stroke point.
9. The mountain wind power lightning protection maintenance integrated system according to claim 1, further comprising a node redundancy unit, wherein the node redundancy unit is used for automatically taking over data receiving and calculating of the micro-sensing unit and the grounding grid sensing unit corresponding to the fault node by two adjacent tower edge computing units when any one of the tower edge computing units fails.
10. The mountain wind power lightning protection and rapid positioning method utilizing the mountain wind power lightning protection and maintenance integrated system as claimed in any one of claims 1-9 is characterized by comprising the following steps: Step 1, monitoring thunderstorm corona discharge around a line and the intensity of an environmental electric field in real time by a micro-sensing unit, and activating a soil resistivity sensor and collecting soil parameters around a grounding electrode at high frequency when detecting that the local high temperature of a lightning conductor is more than 100 ℃ or the intensity of the environmental electric field is more than 8 kV/m; step 2, when lightning strike occurs, the microsensor unit collects the amplitude value, waveform and time of arrival at the adjacent towers and transmits the amplitude value, waveform and time of arrival to the edge calculation unit of the towers; Step 3, the compound interception net is released by the winding driver to form a trapezoid protection barrier covering the upper part and the lower part of the line, and meanwhile, when the grounding net sensing unit detects that the grounding resistance is increased to be more than 8 omega, the electromagnetic control valve is controlled to be opened so as to reduce the soil resistivity; If the lightning stroke does not hit the power transmission line, the tower edge calculating unit only records the action data of each unit, and if the power transmission line is struck by the lightning, the tower edge calculating unit synchronizes the data time stamps of the micro sensing unit and the grounding grid sensing unit through the dual-mode clock module, and operates a fusion algorithm to calculate the coordinate of the lightning stroke point; step 5, after the lightning strike risk is relieved, the composite interception net is lifted back into the sealed storage box, and when the grounding resistance is stable and is less than or equal to 6Ω, the electromagnetic control valve is closed; and 6, if the power transmission line is struck, after receiving the strike point coordinates, overhauling the power transmission line by an overhauling staff.

Description

Mountain wind power lightning protection maintenance integrated system and lightning protection and quick positioning method Technical Field The invention belongs to the technical field of wind power lightning protection, and particularly relates to a mountain wind power lightning protection and maintenance integrated system and a lightning protection and rapid positioning method. Background Mountain wind power is developed rapidly due to abundant wind energy resources, but lightning protection and lightning stroke positioning of a transmission line are limited by the environment and face outstanding problems. The terrains are mainly steep slopes, canyons and rock areas, and the soil resistivity is generally up to 1000-5000 omegaM is far higher than the plain area, so that the leakage current efficiency of the traditional grounding grid is greatly reduced, and the lightning current is easy to cause counterattack accidents because of incapability of being quickly discharged after lightning is led out; in addition, extreme weather such as mountain strong wind, icing, heavy rain and the like frequently occur, so that the lightning conductor is easily deflected by wind and is deformed by icing, the stability of a protection angle is damaged, the sag change of a power transmission line is possibly caused, the lightning protection blind area is enlarged, and the lightning shielding failure risk is increased. For mountain wind power projects built in high-incidence areas of thunderstorms, the annual lightning stroke frequency is generally more than or equal to 15 times/km 2, the lightning stroke energy is obviously higher than that of plain, the single lightning current amplitude is often more than 200kA, and in extreme cases, the single lightning current amplitude can reach 500kA, so that strong impact is formed on the protection of a power transmission line. The influence of the hillside abrupt slope and canyon topography is superimposed, the traditional fixed protection angle of the lightning conductor is easy to lose efficacy, the shielding failure risk is 3-5 times higher than that of the plain, meanwhile, the grounding grid is insufficient in drainage capacity due to high-resistivity soil, high-energy lightning current cannot be conducted to the ground rapidly, and the lightning conductor is easy to break down to cause counterattack with the gap of the power transmission line. In the prior art, lightning protection relies on a lightning conductor and a lightning rod is arranged on a tower column to realize lightning conduction, but in a mountain thunderstorm high-incidence area, the condition of a transmission line in lightning stroke still exists. After the transmission line is struck by lightning, workers are required to check and overhaul the striking point, so that a great amount of manpower and material resources are consumed, and the transmission efficiency is seriously affected. Disclosure of Invention The invention provides a mountain wind power lightning protection and overhaul integrated system and a lightning protection and quick positioning method, which are used for solving the problems that a power transmission line in a mountain thunderstorm high-incidence area is easy to strike and has low overhaul efficiency. In order to solve the technical problems, the invention adopts the following technical scheme: in one aspect, the application provides a mountain wind power lightning protection maintenance integrated system, comprising: the micro-sensing unit is integrated at the segment joint of the lightning conductor and is used for collecting the lightning current amplitude and the arrival time when lightning strikes; The grounding grid sensing unit is embedded into the terrain anchoring grounding module of the mountain wind power pole tower and is used for monitoring the instantaneous resistance change, inflow current and resistance reduction state of the grounding module; The lightning conductor protection unit is arranged at the top of the tower and used for adjusting the position of the lightning conductor in a two-dimensional manner; The auxiliary interception unit is deployed in the middle of the large-span line and is used for covering a lightning protection dead zone; The grounding resistance reducing unit is integrally designed with the grounding module and is used for increasing the conductivity of the land, and comprises an electromagnetic control valve which is in signal connection with the grounding grid sensing unit and is used for adjusting the opening and closing of the electromagnetic control valve according to the change of the grounding resistance; The tower edge calculating unit is arranged below the wind power tower cross arm and used for synchronizing clocks, processing data and calculating lightning stroke point coordinates, and is connected with the micro-sensing unit through a lightning conductor. Further, the micro-sensing unit comprises a current transformer and a high-pr