Vertical-Shaft Wind Turbine Blade Adjustment for Overspeed Control
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Solution Overview
Problem
Vertical-shaft wind power generators face overspeed issues due to limited windage area and instability during high wind conditions, leading to potential damage and reduced service life.
Innovation Solution
A vertical-shaft wind power generation device with an adjustment mechanism that reduces the windage area of blades to zero by moving or rotating them according to wind speed, using hydraulic rods and an anemograph for automatic control, integrated with solar cell panels for combined energy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the windage area of blades is limited to prevent overspeed, then the generator set stability is improved, but the utilization rate of wind energy during starting state decreases
Solution Approach 1:
The patent applies the dynamics principle by making the blade windage area adjustable rather than fixed. The blade can dynamically change its effective windage area based on operating conditions: during starting state, the blade is in a horizontal position to maximize windage area and wind energy utilization; during high wind speed, the blade rotates to a vertical position to minimize windage area and prevent overspeed. This dynamic adjustment resolves the contradiction between stability and productivity.
2Speed
If the blade windage area is reduced to prevent overspeed, then the rotation speed control is improved, but the device becomes more likely to shake and become unstable under high wind force
Solution Approach 1:
The patent uses dynamics by implementing a dynamically adjustable blade configuration that rotates between horizontal and vertical positions. During high wind force, the blade rotates to a vertical position where its windage area is minimized, effectively preventing overspeed while maintaining device stability. This dynamic repositioning allows the system to adapt to varying wind conditions, resolving the contradiction between speed control and stability.
3Reliability
If the blade windage area is reduced to zero under high wind force, then the overspeed problem is fundamentally solved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical adjustment mechanisms with a simpler gravity-based system. The blade is positioned such that during high wind force, gravity naturally causes the blade to rotate to a vertical position where its windage area is minimized. This passive gravitational mechanism eliminates the need for complex active control systems, hydraulic rods, or motors, thereby resolving the contradiction between reliable overspeed prevention and device complexity.
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
Prevents overspeed and enhances stability and adaptability, extending the service life and improving power generation efficiency while allowing for adaptive windage area adjustments and simultaneous wind and solar energy harvesting.
Implementation Method 1
anemograph for automatic control
Implementation Method 2
using hydraulic rods and an anemograph for automatic control
Implementation Method 3
integrated with solar cell panels for combined energy generation
Implementation Method 4
blades are driven by means of wind power to rotate so as to convert the wind power to electric energy
Data Source
AI summary
The present application discloses a power generation device so as to solve the generator set overspeed problem. The power generation device comprises: a stand column; and at least one generator set located on the stand column. The generator set comprises a support, blades connected to the support, and a power generator generating power by means of rotation of the blades, and an adjustment device located on the support and used for adjusting a windage area of the blades by moving or rotating the blade according to a wind speed. The wind power generation device may reduce an effective windage area to zero when the wind force is too high, thereby improving stability and applicability in a changeable environment and prolonging the service life of the apparatus.