Variable Input Synchronous Output Drivetrain for Wind Turbines
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Solution Overview
Problem
Wind turbines face challenges in producing a constant output frequency to match utility grids due to volatile wind speeds, leading to inefficiencies and high maintenance costs with existing solutions like frequency converters and mechanical systems.
Innovation Solution
A wind turbine drivetrain incorporating a planetary gearbox with a carrier, planet gear, sun gear, and ring gear, along with a motor and controller to selectively adjust rotational speeds, ensuring a constant output frequency is achieved.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If frequency converters are added between the generator and utility grid, then constant output frequency is achieved, but cost and device complexity increase significantly
Solution Approach 1:
The patent extracts the frequency conversion function from a separate frequency converter device and integrates it into the drivetrain through a variable input synchronous output mechanism. This allows the drivetrain itself to perform the frequency matching function, eliminating the need for external frequency converters and reducing overall system complexity while maintaining constant output frequency capability
Solution Approach 2:
The drivetrain is designed to perform multiple functions: power transmission, speed adjustment, and frequency synchronization. By making the drivetrain universal and capable of handling variable input speeds while providing synchronous output, the system eliminates the need for dedicated frequency conversion equipment, thereby reducing device complexity and cost
2Stability of the object's composition
If frequency converters are added between the generator and utility grid, then constant output frequency is achieved, but maintenance costs and downtime increase
Solution Approach 1:
By removing the frequency converter from the system and integrating frequency synchronization directly into the drivetrain, the patent eliminates a major source of maintenance and downtime. The simplified drivetrain architecture with variable input synchronous output capability reduces the number of failure points and maintenance requirements while maintaining reliable constant frequency operation
Solution Approach 2:
The drivetrain is designed to automatically adjust and synchronize its output frequency to match the utility grid requirements without external intervention. The variable input synchronous output mechanism self-regulates to maintain constant output frequency, reducing the need for manual maintenance and intervention, thereby improving reliability
3Stability of the object's composition
If mechanical systems with differential gear assemblies are added, then constant output frequency is achieved, but the systems require large, powerful components that are expensive
Solution Approach 1:
The patent employs a dynamic variable input synchronous output drivetrain that can adapt its gear ratios and operational characteristics in real-time based on input speed variations. This dynamic capability allows the system to maintain constant output frequency without requiring oversized, rigid mechanical components, thereby reducing device complexity and cost while achieving frequency stability
4Stability of the object's composition
If mechanical systems with differential gear assemblies are added, then constant output frequency is achieved, but energy input requirements increase
Solution Approach 1:
The dynamic variable input synchronous output drivetrain optimizes energy transmission by adapting gear ratios to match input conditions. This dynamic optimization minimizes energy losses and reduces the overall energy input requirement compared to static mechanical systems, while still achieving constant output frequency stability
Data Source
AI summary
A wind turbine drivetrain is disclosed. The wind turbine drivetrain includes a planetary gearbox. The planetary gearbox includes a carrier rotatably driven at a first input rotational speed, and a planet gear rotatably mounted to the carrier. The planetary gearbox further includes a sun gear rotatably coupled to the planet gear, and a ring gear rotatably coupled to the planet gear. One of the carrier, the sun gear, or the ring gear is selectively rotatably driven at a second input rotational speed. The wind turbine drivetrain further includes an output gear rotatably driven by the planetary gearbox at an output rotational speed, and a motor selectively operable to rotatably drive the one of the carrier, the sun gear, or the ring gear.