Wind Turbine Pitch Control for Grid Stabilization
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Solution Overview
Problem
Wind turbines generate significant noise due to aerodynamic acoustic emissions, which can exceed regulatory limits, necessitating noise reduction operations (NRO) that compromise maximum power output to comply with noise regulations.
Innovation Solution
A method and system for operating wind turbines in a noise reduction mode, where the turbine determines if the power grid is unstable and increases power delivery during stabilization periods while maintaining noise levels below a selected upper limit, using a processor-controlled pitch adjustment system to manage rotor blade pitch and rotational speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the wind turbine operates in noise reduction mode to comply with noise regulations, then noise levels are reduced below regulatory limits, but power output is reduced below maximum capacity
Solution Approach 1:
The wind turbine control system dynamically adjusts operational parameters including pitch angle and rotational speed based on real-time grid frequency conditions. During grid stabilization events, the system temporarily deviates from noise reduction mode by increasing power output and accepting higher noise levels, while maintaining noise compliance during normal operation
Solution Approach 2:
The system changes operational parameters (pitch angle, rotational speed, power output) based on grid frequency conditions. When grid frequency drops below reference value, the controller increases power output by adjusting pitch angle and rotational speed, temporarily exceeding noise reduction parameters to support grid stabilization
2Reliability
If the wind turbine increases power output to stabilize an unstable power grid, then grid stability is improved, but noise levels exceed the selected upper limit
Solution Approach 1:
The control system continuously monitors grid frequency and prepares to increase power output when grid instability is detected. The system has pre-programmed response protocols that activate automatically when frequency deviates from reference values, enabling rapid grid support while managing noise exposure duration
Solution Approach 2:
The wind turbine operates in periodic cycles between noise reduction mode and grid stabilization mode. The controller monitors grid frequency continuously and switches operational modes based on detected conditions, returning to noise reduction mode after stabilization events to minimize cumulative noise impact
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
This approach allows for efficient noise reduction and stabilization of unstable power grids without exceeding noise regulatory limits, utilizing the wind turbine's extra power capacity to support grid stability while minimizing noise impact.
Implementation Method 1
The blades are oriented such that wind passing over the blades turns the rotor and rotates the shaft, thereby driving the generator to generate electricity
Implementation Method 2
A rotor is rotatably mounted to the nacelle and is coupled to a generator by a shaft... rotates the shaft, thereby driving the generator to generate electricity
Implementation Method 3
at least one pitch adjustment system coupled to the rotor blade... operating the wind turbine for generating noise below a first sound level
Data Source
AI summary
According to the present disclosure, a method of operating a wind turbine (10) coupled to a power grid (92) for delivering electric power thereto is provided. The method includes: a) operating the wind turbine (10) in a noise reduction mode; b) determining whether the power grid (92) is in an unstable grid state corresponding to an increase of power demand; and, c) increasing the electric power delivered by the wind turbine (10) to the power grid (92) during a stabilization time period for supporting stabilization of the unstable grid. Further, the increasing of the electric power for supporting stabilization of the unstable grid is performed such that a resulting noise increase is below a selected upper level. In addition thereto, a control system and a wind turbine for performing the above method are provided.