Wind Turbine Blade Lightning Path Sensing for Strike Location
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Solution Overview
Problem
Existing lightning protection systems for wind turbine blades struggle to accurately identify whether lightning strikes the receptor or the leading edge protection portion due to their electrical connection, making it difficult to pinpoint the lightning-struck portion.
Innovation Solution
A lightning protection system for wind turbine blades that includes a receptor, leading edge protection portion, down conductor, and current sensors to measure current flow, allowing identification of the lightning-struck position based on current magnitude and waveform analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the leading edge protection portion is electrically connected to the receptor to suppress erosion, then erosion resistance is improved, but the ability to identify the lightning-struck portion deteriorates
Solution Approach 1:
The patent divides the electrical connection path into separate measurable segments by inserting current sensors between the receptor and leading edge protection portion, and between the leading edge protection portion and down conductor. This segmentation allows independent measurement of current flow through each component, enabling identification of the lightning strike location while maintaining electrical connectivity for erosion protection.
Solution Approach 2:
The current sensors act as intermediaries that enable measurement and identification functionality without disrupting the electrical connection between the receptor and leading edge protection portion. These sensors mediate between the need for continuous electrical connectivity (for erosion suppression) and the need for strike location identification, allowing both requirements to coexist.
2Measurement precision
If current sensors are installed to identify lightning strike location, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The current sensors serve multiple functions: they detect lightning strike currents, identify strike location, and provide data for both immediate strike detection and historical analysis. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in system complexity while achieving accurate strike identification.
Solution Approach 2:
The system uses the existing electrical connection structure (receptor, leading edge protection portion, down conductor) that was already in place for erosion protection, and adds measurement capability to it. The existing components continue to serve their primary function while simultaneously enabling strike identification, reducing the need for entirely new separate systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise identification of the lightning-struck portion on the wind turbine blade, facilitating timely repair and maintenance.
Implementation Method 1
a first current sensor 34 disposed corresponding to the down conductor 24 and configured to measure a current flowing through a portion 24a, of the down conductor 24, between the blade tip 16 and the connection point 31; a second current sensor 36 disposed corresponding to the connecting conductor 30 and configured to measure a current flowing through the connecting conductor 30
Data Source
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AI summary
A lightning protection system for a wind turbine blade includes: a receptor disposed in a tip portion of the wind turbine blade; a leading edge protection portion made of a metal and electrically connected to the receptor and disposed so as to cover a leading edge of the wind turbine blade; a down conductor connected to the receptor; and at least one connecting conductor for electrically connecting the leading edge protection portion and the down conductor at a position between the receptor and a blade root in a blade spanwise direction of the wind turbine blade; a first current sensor for measuring a current flowing through a portion, of the down conductor, between a blade tip and a connection point with the at least one connecting conductor in the blade spanwise direction; at least one second current sensor disposed corresponding to the at least one connecting conductor, the at least one second current sensor being configured to measure a current flowing through a portion, of the down conductor, between the blade root and the connection point; and an identification part configured to identify a lightning-struck portion of the wind turbine blade based on a first current measured value which is a current measured value by the first current sensor and a second current measured value which is a current measured value by the second current sensor.