Wind Turbine Blade Power Bus With Dielectric Lightning Isolation
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Solution Overview
Problem
Existing wind turbine blade electrical systems struggle to safely distribute power to the blade's tip region while withstanding lightning strikes without inducing detrimental voltages in electrical equipment, and they lack sensors and actuators inside the blade for effective control and measurement.
Innovation Solution
A blade electrical system that includes a power-transfer unit with a dielectric separation, an electrical-power bus, and powered units, which safely transmits power from the hub to the blade tip, using a dielectric material like Teflon to isolate components and prevent voltage flash-over during lightning strikes, and incorporates sensors and actuators for blade measurement and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If electrical power is transmitted to the blade tip region, then sensing and control capabilities are improved, but vulnerability to lightning strike damage increases
Solution Approach 1:
A dielectric material is introduced as an intermediary between the electrical power transmission components and the lightning strike path. The dielectric separating element is positioned between the power driver unit and power conditioner unit, preventing direct electrical connection during lightning strikes while allowing normal power transmission during operation.
Solution Approach 2:
The electrical power transmission system is segmented into separate units (power driver unit and power conditioner unit) that are electrically isolated from each other by the dielectric material. This segmentation allows the system to maintain power transmission functionality while protecting against lightning-induced voltage spikes.
2Measurement precision
If electrical equipment is placed inside the blade, then measurement and control functions are improved, but reliability during lightning strikes deteriorates
Solution Approach 1:
The dielectric material serves as a protective intermediary that shields electrical equipment inside the blade from lightning-induced voltage surges. It allows the equipment to function during normal operation while providing electrical isolation during lightning strikes.
Solution Approach 2:
The dielectric separating element is pre-installed in the electrical power transmission path to provide protective cushioning against future lightning strikes. This preventive measure ensures equipment reliability without affecting normal measurement and control operations.
3Use of energy by moving object
If power transmission components are installed in the blade, then electrical power distribution is improved, but device complexity increases
Solution Approach 1:
The dielectric separating element serves multiple functions simultaneously: it provides electrical isolation during lightning strikes, maintains structural integrity of the power transmission system, and enables compact integration of power driver and conditioner units within the blade. This multi-functionality reduces overall system complexity despite the addition of protection mechanisms.
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 safe power distribution to the blade tip, withstands lightning strikes without damaging equipment, and allows for effective sensing and control of blade conditions, enhancing wind energy capture and turbine health monitoring.
Implementation Method 1
a power-transfer unit comprising a power-driver unit, a power-conditioner unit and a dielectric separating the power-driver unit and the power-conditioner unit
Implementation Method 2
a down-wire for the conduction of lightning current to the ground
Data Source
AI summary
A wind turbine (10) is disclosed having a hub (14) with electrical power therein and at least one blade (20) attached to the hub. The blade (20) has a blade root (21), a blade tip (26) and a down-wire (30) for the conduction of lightning current to the ground. The wind turbine (10) further has a blade electrical system (99) that takes electrical power from the hub (14) and transmits electrical power into the blade (20) to at least one area located between the blade root (21) and the blade tip (26). The blade electrical system (99) if formed by a power-transfer unit (100) having a power-driver unit (110), a power-conditioner unit (130) and a dielectric (120) separating the power-driver unit (110) and the power-conditioner unit (130). The power-driver unit (110) receives electrical power from the hub (14) and transmit the electrical power through the dielectric (120) to the power-conditioner unit (130). An electrical-power bus (200) is electrically attached to the power-conditioner unit (130) and extends into the blade (20). At least one powered unit (300) is provided which is electrically connected to, and electrically powered by, the electrical-power bus (200).