Wind Farm Radar Interference Mitigation via Rotor Synchronization
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Solution Overview
Problem
Wind turbines in wind farms cause interference with radar systems due to Doppler shifts from rotating rotor blades, leading to misinterpretation of rotor structures as flying objects, which complicates the detection of real flight targets and can reduce flight safety.
Innovation Solution
Synchronizing the rotational movements of wind turbines within a wind farm to minimize the frequency of rotor blades pointing vertically, thereby reducing disruptive radar reflections by coordinating the rotational positions and speeds of rotor structures to align them more simultaneously, thus reducing interference with radar systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rotor blades are designed with radar-absorbing construction, then radar interference is reduced, but design freedom regarding structure and material is reduced
Solution Approach 1:
The patent changes the operational parameters of the wind turbines by synchronizing rotational speeds and coordinating rotor azimuth angles. Instead of modifying the physical structure of rotor blades with radar-absorbing materials, the invention uses control techniques to adjust when and how turbines rotate, thereby reducing radar reflections without compromising design freedom of blade structure and materials
Solution Approach 2:
The invention introduces dynamic control of turbine operation by continuously adjusting rotational speeds and azimuth angles based on synchronization algorithms. This dynamic approach allows the system to adaptively minimize radar interference in real-time while maintaining full flexibility in rotor blade design and materials
2Device complexity
If multiple wind turbines operate independently, then design and operation are simple, but radar interference frequency increases
Solution Approach 1:
The patent merges the operational control of multiple independent wind turbines into a coordinated system. By implementing synchronization control that links rotational speeds and azimuth angles across multiple turbines, the invention reduces overall radar interference frequency while maintaining manageable system complexity through centralized control algorithms
3Productivity
If rotor blades point vertically upwards or downwards frequently, then complete rotation is achieved, but disruptive radar reflections occur
Solution Approach 1:
The invention uses periodic synchronization of rotor positions across multiple turbines to create coordinated patterns of vertical blade orientation. By controlling when turbines reach the vertical position and ensuring they do so in a synchronized manner rather than independently, the system maintains rotational efficiency while reducing the cumulative frequency of disruptive radar reflections across the wind farm
Solution Approach 2:
The control system performs preliminary coordination of rotor azimuth angles and rotational speeds before turbines reach positions that would cause maximum radar interference. By pre-synchronizing the rotational states of multiple turbines, the system prevents simultaneous vertical blade orientations that would create strong radar reflections, thereby reducing interference before it occurs
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 synchronization of wind turbine rotor structures significantly reduces the frequency of disruptive radar reflections, enhancing the ability to distinguish real flight targets and improving flight safety by minimizing false alarms and interference in radar detection ranges.
Implementation Method 1
Radar radiation reflected from the rotor structure or its blades undergoes a Doppler shift depending on the direction of incidence of the radar radiation and the rotational position or speed of the rotor structure.
Data Source
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AI summary
The wind farm (1) has multiple wind turbines (10-1,10-2,10-3,10-4) having rotary mounted rotor structures (12-1,12-2,12-3,12-4) and control element for controlling the operation of the individual wind turbines. The control element is designed to synchronize the rotational movements of the rotor structures of some of the wind turbines. Independent claims are also included for the following: (1) a method for operating a wind turbine; (2) a wind turbine in a wind farm; and (3) a method for controlling operation of a wind turbine.