Wind Turbine Blade Grounding for Electrostatic Charge Dissipation

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Solution Overview

Problem

Wind turbines experience electrostatic charge accumulation in rotor blades, leading to malfunctions and potential damage due to static charge interference with electrical components, which can trigger automatic shutdowns and affect energy production.

Innovation Solution

A wind turbine system with switchable connections between the electrical system and ground, allowing controlled grounding to dissipate electrostatic charge, combined with a blade heating system to prevent ice accumulation and needle electrodes for corona discharge.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the electrical system is grounded to dissipate electrostatic charge, then the electrostatic charge is eliminated, but the electrical system becomes inoperable

Engineering Contradiction:

Improveelectrostatic charge dissipationVSAvoidelectrical system operability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent applies a switchable connection that can dynamically change between open and closed states. The connection is controlled based on the operational state of the electrical system: open when the system needs to operate, closed when grounding is required for charge dissipation. This dynamic switching resolves the contradiction by allowing the system to adapt its grounding state according to operational needs.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The control unit monitors the operational state of the electrical system in advance and proactively opens the switchable connection before the system needs to operate. This preliminary action ensures that the grounding is removed ahead of time, preventing any potential interference with electrical operations while still allowing grounding when necessary for charge dissipation.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If the switchable connection is opened to operate the electrical system, then the electrical system becomes operable, but electrostatic charge accumulates

Engineering Contradiction:

Improveelectrical system operabilityVSAvoidelectrostatic charge accumulation

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The control unit continuously monitors the operational state of the electrical system and uses this feedback to control the switchable connection. When the system transitions to an operational state, the control unit detects this change and opens the connection accordingly. This feedback mechanism ensures that the grounding state is automatically adjusted to match the operational needs, preventing charge accumulation during operation while enabling grounding when required.

Inventive Principle:

Principle #23Feedback

3Reliability

If a non-switchable overvoltage connection is used for lightning protection, then automatic grounding is achieved, but controlled charge dissipation is not possible

Engineering Contradiction:

Improvelightning protectionVSAvoidcontrolled charge dissipation

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent divides the grounding connection into two separate pathways: a non-switchable overvoltage connection for automatic lightning protection and a switchable connection for controlled charge dissipation. This segmentation allows each connection to serve its specific function independently - the overvoltage connection provides automatic protection without interfering with controlled dissipation operations, while the switchable connection enables adaptive charge management.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The switchable connection serves multiple functions: it provides controlled charge dissipation during normal operation, enables manual grounding when needed, and can work in conjunction with the overvoltage connection for comprehensive protection. This multi-functionality resolves the contradiction by adding versatility to the grounding system without compromising the automatic lightning protection capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Effectively dissipates electrostatic charge, prevents component damage, and ensures safe operation by controlling grounding and discharging, thereby enhancing operational reliability and energy production.

Implementation Method 1

the electrical system can become electrically charged with respect to ground, for example due to air friction and/or precipitation static. To eliminate the accumulated electrostatic charge, the electrical system needs to be grounded

Methodology Applied

Scientific EffectElectrostatic discharge: Electrostatic Discharge

Implementation Method 2

needle electrodes for corona discharge

Methodology Applied

Scientific EffectCorona discharge: Corona Discharge

Implementation Method 3

blade heating system to prevent ice accumulation

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS20250354539A1Wind turbine and method for operating a wind turbine

Publication Date: 2025.11.20 NORDEX ENERGY SE & CO KG

AI summary

A wind turbine includes a rotor blade, an electrical system embedded in the rotor blade and at least one switchable connection between the electrical system and ground. The at least one switchable connection is controllably switchable between an open state and a closed state so that, when the at least one switchable connection is in the closed state, the electrical system is grounded, and, when the at least one switchable connection is in the open state, the electrical system is not grounded.