Wind Turbine Blade Root Inductors for Lightning Discharge Filtering

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Wind turbines are vulnerable to lightning strikes due to the conductive electrical leads in their blades, which can pose a risk to the safety and efficiency of the turbines.

Innovation Solution

A Lightning Discharge Filter System (LDFS) is integrated into the root of the wind turbine blade, featuring large-scale fabricated inductors that form low-pass filters. These inductors are wound around the root and provide a low-pass filter effect, blocking the higher frequency components of lightning strikes while allowing power frequencies to pass through.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If electrical leads are incorporated in the blade to power systems, then powered systems can operate during normal operations, but the electrical leads present a conductive path that lightning may take through sensitive components

Engineering Contradiction:

Improvepowered system operationVSAvoidlightning strike vulnerability

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

A discharge filter comprising inductors and capacitors is introduced as an intermediary component between the electrical leads and the powered systems. This filter blocks high-frequency lightning impulses while allowing normal power frequencies to pass through, thus protecting sensitive components from lightning damage while maintaining operational functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Protective components including surge protection devices and the discharge filter are installed beforehand in the electrical pathway to cushion against potential lightning strikes. These components are positioned to intercept and dissipate lightning energy before it reaches sensitive powered systems, preventing damage in advance.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If a discharge filter is installed to protect against lightning, then protection against high frequency components is improved, but the complexity of the electrical system increases

Engineering Contradiction:

Improvelightning protectionVSAvoidelectrical system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The discharge filter is designed to perform multiple functions: filtering high-frequency lightning impulses, allowing normal power transmission, and working in conjunction with surge protection devices. By consolidating these protective functions into a single integrated filter system, the overall system complexity is managed while maintaining comprehensive protection.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Use of energy by moving object

If electrical leads run along the blade length, then power can be delivered to powered systems, but these leads offer a path of least impedance for electrical discharges

Engineering Contradiction:

Improvepower deliveryVSAvoidconductive path for discharges

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The discharge filter acts as an intermediary that selectively blocks harmful high-frequency electrical discharges while permitting normal power energy flow. The filter components (inductors and capacitors) create impedance specifically for high-frequency lightning impulses, effectively separating the useful power transmission function from the harmful discharge pathway.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

The LDFS effectively protects wind turbine blades from lightning damage by filtering out the higher frequency components of lightning strikes, reducing the risk of electrical discharges to sensitive components and improving the overall reliability and safety of the turbines.

Implementation Method 1

a first cable wound into a first inductor using the root as a mandrel

Methodology Applied

Scientific EffectInductance: Inductor

Implementation Method 2

These inductors are wound around the root and provide a low-pass filter effect, blocking the higher frequency components of lightning strikes while allowing power frequencies to pass through

Methodology Applied

Scientific EffectLow-pass filter effect: Filter (electronic)

Data Source

PatentUS12215672B2Large inductors for lightning protection of power systems

Publication Date: 2025.02.04 VESTAS WIND SYSTEMS AS

AI summary

Embodiments herein describe a discharge filter, located in a root of a wind turbine blade, which includes one or more cables wound into large scale inductors using an internal or external surface of the root as a mandrel. These cables provide power inputs to an electrical panel for one or more a powered systems that are located in a body of the wind turbine blade. The electrical panel is connected to a lightning protection system that selectively provides a path to ground, and the inductors form a high-impedance barrier that shunts power away from the cables and onto the lightning protection system in the event of a lightning strike or other electrical discharge traveling from the powered systems to the electrical panel.