Solar Tracker Damper for Wind-Induced Row Twist Control
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Solution Overview
Problem
Solar tracker systems face challenges in maintaining the intended tilt angle of photovoltaic modules due to environmental loading, leading to row twist and increased costs, especially when multiple actuators are used to mitigate this issue, which introduces additional failure modes and complexity.
Innovation Solution
A photovoltaic system incorporating a damper with a variable damping ratio that adjusts based on the actuator's movement rate, providing higher resistance during high wind loading to reduce twist and support static loads, while allowing smooth movement during actuator operation, thereby reducing material usage and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single actuator is used to control a row of PV modules, then device complexity and cost are reduced, but row twist occurs under environmental loading causing loss of positioning precision
Solution Approach 1:
The damper's damping ratio is made variable rather than fixed, allowing it to adapt dynamically to operating conditions. The damping ratio automatically increases under high wind loading to reduce row twist, and decreases during actuator operation to allow smooth movement, resolving the contradiction between structural stability and operational flexibility
Solution Approach 2:
The physical parameter of the damper (damping ratio) is changed based on operating conditions. By varying the damping ratio in response to actuator movement rate and environmental loading, the system maintains positioning precision without requiring additional actuators or complex structural reinforcements
2Manufacturing precision
If multiple actuators are used per row to reduce row twist, then positioning precision is improved, but device complexity, cost, and failure modes increase
Solution Approach 1:
The damper acts as an intermediary element between the single actuator and the PV module row. It provides additional control capability to prevent row twist without requiring multiple actuators, thereby maintaining positioning precision while avoiding the complexity and increased failure modes associated with multiple actuators
Solution Approach 2:
The damping function is extracted from the actuator system and implemented as a separate passive component. This allows the actuator to focus on positioning while the damper handles environmental loading, eliminating the need for multiple actuators and their associated communication and control complexity
3Strength
If higher damping ratio is used to resist wind loading, then row twist is reduced, but movement smoothness during actuator operation deteriorates
Solution Approach 1:
The damping ratio is made dynamic rather than static, automatically adjusting based on the actuator's movement rate and environmental conditions. During actuator operation, the damping ratio decreases to allow smooth movement; under high wind loading, it increases to resist twisting forces, thus resolving the contradiction between operational smoothness and structural stability
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 damper system effectively mitigates dynamic wind loading and environmental effects, reducing the risk of twist and enhancing energy capture by maintaining the optimal tilt angle, while also lowering construction and maintenance costs by allowing for a design based on lower wind speeds and reduced material usage.
Implementation Method 1
A photovoltaic system incorporating a damper with a variable damping ratio that adjusts based on the actuator's movement rate, providing higher resistance during high wind loading to reduce twist
Data Source
AI summary
A photovoltaic system includes a collection of photovoltaic modules, a base supporting the collection of photovoltaic modules, and a damper coupled between the collection of photovoltaic modules and the base. The damper resists movement of the photovoltaic modules relative to the base. The damper has a first damping ratio when the collection of photovoltaic modules moves at a first rate relative to the base and a second damping ratio when the collection of photovoltaic modules moves at a second rate relative to the base, and the damper passively transitions from the first damping ratio to the second damping ratio.