Tethered Power Wing Wind Energy System with Dynamic Cable Control
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Solution Overview
Problem
Current wind energy conversion systems using power wing profiles tethered to the ground face issues such as cable wear and high maintenance costs due to continuous motion and variable wind direction challenges, limiting energy production and increasing costs, especially in off-shore applications.
Innovation Solution
A system that utilizes a ground unit moving along a fixed-length cable path, automatically adapting to wind direction changes and intensity variations, with a control system optimizing energy generation by maintaining optimal inclination and regulating cable length to maximize energy production without passive phases, and applicable in both onshore and off-shore contexts without the need for seabed foundations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable length cables are used for wind energy conversion, then energy production is improved, but cable wear increases and maintenance costs rise
Solution Approach 1:
The system dynamically adjusts the cable length through a winch mechanism controlled by a control unit, allowing the cable length to vary based on wind conditions and flight phase while maintaining optimal energy generation. The cable length is modified in real-time during operation to match the required trajectory and wind parameters.
Solution Approach 2:
The system changes the physical parameter of cable length during operation to optimize energy production. The control unit continuously monitors wind conditions and adjusts the cable length parameter accordingly, transitioning between different length states to maximize power generation while managing cable stress and wear through controlled variations.
2Reliability
If fixed length cables are used for wind energy conversion, then cable wear is reduced, but energy production is limited due to passive phases
Solution Approach 1:
The system employs a dynamic cable length adjustment mechanism with a winch and control unit that actively manages cable length during operation. This eliminates passive phases by continuously optimizing the cable configuration to maintain productive flight conditions, allowing the ground unit to follow optimal trajectories that maximize energy generation throughout the entire operational cycle.
Solution Approach 2:
The control unit receives feedback from wind sensors and system state monitors to continuously adjust cable length in real-time. This closed-loop control ensures the system responds to changing wind conditions by modifying cable length parameters, maintaining optimal energy generation while preventing harmful conditions that would increase cable wear.
3Productivity
If continuous cable unwinding and winding is implemented, then energy generation is maintained, but cable wear increases and replacement frequency rises
Solution Approach 1:
The system carefully controls the cable length parameter through the winch mechanism, making deliberate adjustments only when necessary to maintain optimal flight conditions. The control unit monitors cable stress and wind conditions to minimize unnecessary unwinding and winding operations, reducing cumulative wear while maintaining continuous energy generation capability.
Solution Approach 2:
The system implements preventive maintenance strategies by monitoring cable wear indicators and operational cycles through the control unit. The system anticipates wear accumulation and schedules maintenance before critical failure occurs, cushioning against unexpected cable failures that would disrupt energy production while managing the inevitable wear from continuous operation.
4Device complexity
If the ground unit follows a fixed path, then system simplicity is maintained, but adaptability to wind direction changes is reduced
Solution Approach 1:
The ground unit's path is dynamically adjusted through control of the winch mechanism and ground unit orientation. The control unit processes wind direction data and commands real-time modifications to the ground unit's position and cable length, allowing the system to track and adapt to changing wind directions while maintaining a relatively simple overall system architecture based on established kitegen principles.
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 system reduces cable wear, eliminates passive phases, and enhances energy production by maintaining optimal alignment with wind direction, leading to lower operational costs and increased installation sites, particularly in off-shore environments.
Implementation Method 1
a power wing profile (4) connected by at least one cable (3) to a ground unit (1), which is able to move along a predetermined path in an alternating way, in a continuous and cyclic manner, being drawn by the profile itself through the cable
Implementation Method 2
a generator (6), set on the ground unit (1) and able to convert the motion of the ground unit into electric power
Data Source
AI summary
A method and system for converting wind energy into electrical or mechanical energy through the flight of at least one power wing profile (10) tethered via one or more cables (11) to a ground unit (9) moved by the power wing profile along a path of alternating displacement (12) for driving a generator (13), where the path of alternating displacement (12) is orientable so as to set itself in a direction (17) substantially orthogonal to the direction of the wind (W). During the phases of flight of the power wing profile (10) in conditions of generation of energy the length of the cables (11) is kept constant.