CN-121993363-A - Lightning stroke analysis method and device for blades of rotary fan suitable for engineering calculation

CN121993363ACN 121993363 ACN121993363 ACN 121993363ACN-121993363-A

Abstract

The application provides a lightning stroke analysis method and device for blades of a rotary fan suitable for engineering calculation, and relates to the field of wind power lightning protection. The lightning stroke probability analysis method comprises the steps of constructing a lightning stroke distance model based on long-gap discharge breakdown voltage data, correcting the lightning stroke distance model based on blade tip linear velocity parameters, constructing a blade electric geometric model by combining dynamic lightning stroke characteristics of a fan blade through the corrected lightning stroke distance model, calculating exposure degree values and shielding degree values by taking the electric geometric model as constraint, acquiring corresponding blade lightning stroke probability characteristics based on a proportional relation between the exposure degree values and the shielding degree values, carrying out weighted statistical processing on the blade lightning stroke probability characteristics under different lightning conditions and working conditions by combining lightning stroke probability distribution characteristics, and outputting lightning stroke probability analysis results. The method solves the problems that the real lightning receiving condition of the wind driven generator blade under the complex operation condition is difficult to accurately reflect, and the evaluation result deviates from the actual lightning behavior and is inaccurate.

Inventors

LIU XIAOPENG
KAN YI
TANG YANG
LI JINSHU
FENG ZHIQIANG
YAO YAO
ZHOU XUEMING
YU BIN
WANG XIANKANG
ZHANG LU
LI ZIJIAN
ZHANG ZHI

Assignees

国网湖北省电力有限公司电力科学研究院

Dates

Publication Date: 20260508
Application Date: 20260105

Claims (10)

1. A rotary fan blade lightning strike analysis method suitable for engineering calculation, the method comprising: Acquiring long-gap discharge breakdown voltage data, and constructing a lightning electric shock distance model based on the long-gap discharge breakdown voltage data; Acquiring a blade tip linear velocity parameter corresponding to a fan blade, and correcting the lightning stroke model based on the blade tip linear velocity parameter; Constructing a blade electric geometric model by combining the modified lightning stroke model with the dynamic lightning receiving characteristics of the fan blade; Calculating exposure degree values and shielding degree values corresponding to the fan blades under different lightning conditions and working conditions by taking the electrical geometric model as constraint; acquiring corresponding blade lightning probability characteristics based on the proportional relation between the exposure degree value and the shielding degree value; And combining the lightning probability distribution characteristics, carrying out weighted statistical treatment on the lightning probability characteristics of the blades under different lightning conditions and working conditions, and outputting lightning probability analysis results.
2. The method of claim 1, wherein the acquiring long-gap discharge breakdown voltage data and constructing the lightning strike distance model based on the long-gap discharge breakdown voltage data specifically comprises: acquiring the long-gap discharge breakdown voltage data corresponding to the fan blade under different gap distances; fitting the change relation between the long-gap discharge breakdown voltage data and the corresponding gap distance, and establishing a breakdown voltage relation used for representing the change of discharge characteristics along with the gap distance based on a fitting result, wherein the discharge characteristics comprise critical discharge characteristics and discharge development characteristics; and constructing the lightning stroke model associated with the lightning current intensity based on the breakdown voltage relation.
3. The method according to claim 1, wherein the obtaining the tip linear velocity parameter corresponding to the fan blade and correcting the lightning stroke model based on the tip linear velocity parameter specifically includes: Determining the influence degree of the rotation state of the blade on the lightning action distance based on the association relation between the blade tip linear speed parameter and the lightning stroke distance model; And carrying out modulation processing on the lightning stroke model according to the influence degree to obtain the lightning stroke model with corrected parameters.
4. The method according to claim 1, wherein said constructing a blade electrical geometry model by combining said modified lightning strike distance model with dynamic lightning receiving characteristics of said fan blade, comprises: Based on the corrected lightning stroke model, determining equivalent lightning action ranges of the fan blades corresponding to different space positions under the action of lightning; Combining the dynamic lightning receiving characteristics of the fan blade, and establishing a relative spatial relationship between the blade body and at least one lightning receiving part under different blade postures; According to the relative spatial relationship between the equivalent lightning action range and the relative spatial relationship, the lightning action area in the fan blade is expressed as a geometric relationship set formed by an exposure area and a shielding area; and constructing the blade electrical geometric model based on the geometric relation set.
5. The method according to claim 4, wherein the calculating the exposure and shielding values corresponding to the fan blade under different lightning conditions and working conditions with the electrical geometric model as a constraint specifically includes: introducing the lightning condition and the working condition under the space relation defined by the electrical geometric model, wherein the lightning condition comprises a lightning current condition and a lightning incidence direction condition, and the working condition comprises a blade attitude condition and a blade rotation state condition; determining a relative action relationship between a lightning action direction and the blade posture based on the lightning condition and the working condition; Quantifying the equivalent projection range of the exposure area in the lightning action direction according to the relative action relation, and calculating the exposure degree value representing the lightning action degree of the blade; And quantifying the equivalent projection range of the shielding area in the lightning action direction according to the relative action relation, and calculating the shielding degree value representing the protection degree of the blade.
6. The method according to claim 1, wherein the weighting statistical processing is performed on the blade lightning probability characteristics under different lightning conditions and working conditions by combining lightning probability distribution characteristics, and lightning probability analysis results are output, specifically including: Acquiring a lightning probability distribution characteristic for representing the occurrence randomness of lightning, and establishing a corresponding relation between the lightning probability distribution characteristic and the lightning condition; determining weight parameters according to the lightning probability distribution characteristics corresponding to the lightning probability characteristics of the blades obtained under different lightning conditions and different working conditions; and carrying out weighted statistical processing on the lightning receiving probability characteristics of each blade based on the weight parameters, and outputting lightning receiving probability analysis results.
7. The method of claim 1, wherein after said combining lightning probability distribution characteristics, weighting the blade lightning probability characteristics under different lightning conditions and said operating conditions, and outputting lightning probability analysis results, the method further comprises: determining a target protection efficiency level of the fan blade based on the lightning strike receiving probability analysis result, and associating the target protection efficiency level with lightning strike risk contributions corresponding to different space positions of the fan blade to obtain blade risk distribution characteristics; and outputting lightning receiving system optimization guide information based on the blade risk distribution characteristics, wherein the lightning receiving system optimization guide information comprises arrangement position adjustment information of the lightning receiving parts, quantity adjustment information of the lightning receiving parts and protection level adjustment information of the lightning receiving parts.
8. A lightning stroke analysis device of a rotary fan blade suitable for engineering calculation is characterized by comprising an acquisition module and a processing module, wherein, The acquisition module is used for acquiring long-gap discharge breakdown voltage data, constructing a lightning strike distance model based on the long-gap discharge breakdown voltage data, acquiring a blade tip linear velocity parameter corresponding to a fan blade, and correcting the lightning strike distance model based on the blade tip linear velocity parameter; The processing module is used for constructing a blade electric geometric model by combining the modified lightning strike distance model with the dynamic lightning receiving characteristics of the fan blade, calculating exposure degree values and shielding degree values corresponding to the fan blade under different lightning conditions and working conditions by taking the electric geometric model as constraint, acquiring the lightning receiving probability characteristics of the corresponding blade based on the proportional relation between the exposure degree values and the shielding degree values, carrying out weighted statistical processing on the lightning receiving probability characteristics of the blade under different lightning conditions and working conditions by combining the lightning probability distribution characteristics, and outputting lightning strike receiving probability analysis results.
9. An electronic device comprising a processor, a communication bus, a user interface, a network interface, and a memory, the memory for storing instructions, the user interface and the network interface for communicating to other devices, the processor for executing instructions stored in the memory to cause the electronic device to perform the method of any of claims 1-7.
10. A non-transitory computer readable storage medium storing instructions which, when executed, perform the method of any one of claims 1 to 7.

Description

Lightning stroke analysis method and device for blades of rotary fan suitable for engineering calculation Technical Field The application relates to the field of wind power lightning protection, in particular to a lightning stroke analysis method and device for blades of a rotary fan suitable for engineering calculation. Background Along with the continuous improvement of the single-machine capacity of the wind driven generator and the continuous increase of the diameter of the impeller and the height of the tower, the space height of the wind driven generator in a thunderstorm environment and the lightning affected range are obviously enlarged, and the lightning protection problem has become one of key technologies in the safe operation of wind power equipment. In the prior art, a static structure or a simplified geometric model is mostly used as a basis, a fixed strike distance or an empirical correction mode is generally adopted to evaluate the lightning strike risk, the comprehensive influence of lightning current change, lightning incidence direction change and blade running state change on lightning strike receiving behavior is difficult to consider at the same time, the evaluation results of the lightning strike risks at different parts of the blade are not fine enough, the real lightning strike receiving condition of the wind driven generator blade under the complex running working condition is difficult to accurately reflect, and the problems of deviation and inaccuracy of the evaluation results and the actual lightning strike behavior exist. Accordingly, there is a need for a rotary fan blade lightning strike analysis method and apparatus suitable for engineering calculations. Disclosure of Invention The application provides a lightning stroke analysis method and device for a rotary fan blade suitable for engineering calculation, which solve the problems that the prior art is difficult to accurately reflect the real lightning stroke lightning receiving condition of a wind driven generator blade under complex operation conditions, and the evaluation result is deviated from the actual lightning stroke behavior and inaccurate. The application provides a rotating fan blade lightning stroke analysis method suitable for engineering calculation, which comprises the steps of obtaining long-gap discharge breakdown voltage data, constructing a lightning stroke distance model based on the long-gap discharge breakdown voltage data, obtaining blade tip linear speed parameters corresponding to a fan blade, correcting the lightning stroke distance model based on the blade tip linear speed parameters, constructing a blade electric geometric model by combining dynamic lightning receiving characteristics of the fan blade through the corrected lightning stroke distance model, calculating exposure degree values and shielding degree values corresponding to the fan blade under different lightning conditions and working conditions by taking the electric geometric model as constraint, obtaining corresponding blade lightning receiving probability characteristics based on the proportional relation between the exposure degree values and the shielding degree values, carrying out weighted statistical processing on the blade receiving probability characteristics under different lightning conditions and working conditions by combining the lightning probability distribution characteristics, and outputting lightning receiving probability analysis results. The method comprises the steps of obtaining long-gap discharge breakdown voltage data corresponding to fan blades under different gap distances, performing fitting processing on the change relation between the long-gap discharge breakdown voltage data and the corresponding gap distances, and establishing a breakdown voltage relation used for representing the change of discharge characteristics along with the gap distances based on fitting results, wherein the discharge characteristics comprise critical discharge characteristics and discharge development characteristics, and the lightning stroke distance model related to lightning current intensity is constructed based on the breakdown voltage relation. The method comprises the steps of determining the influence degree of a blade rotation state on a lightning action distance based on the association relation between the blade tip linear velocity parameter and the lightning stroke distance model, and modulating the lightning stroke distance model according to the influence degree to obtain the lightning stroke distance model after parameter correction. The method comprises the steps of determining equivalent lightning action ranges of the fan blade corresponding to different spatial positions under the action of lightning based on the corrected lightning stroke distance model, establishing relative spatial relations between a blade body and at least one lightning receiving part under different blade postures by combining the dynam