Multi-Rotor Wind Turbine Pitch Control for Dynamic Load Reduction
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Solution Overview
Problem
Multi-rotor array-type wind turbines face challenges in handling dynamic loads, which have hindered their implementation on a significant commercial scale due to increased mechanical complexity and the need for more sophisticated support structures.
Innovation Solution
A wind turbine system with a control system that adjusts rotor blade pitch to create a lift force opposing gravity, allowing for tailored load management based on wind conditions and operating requirements, thereby reducing dynamic loads on the support structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wind turbine modules are mounted to a support structure, then productivity and power generation capacity are improved, but device complexity and mechanical load handling difficulty increase
Solution Approach 1:
The wind turbine system is divided into multiple independent wind turbine modules, each with its own rotor, power generation system, and pitch adjustment system. This segmentation allows each module to operate independently and be controlled separately, managing the complexity of handling multiple rotors while maintaining high productivity through parallel operation of multiple modules mounted on a shared support structure
Solution Approach 2:
The invention implements dynamic pitch adjustment of rotor blades through pitch adjustment systems that can independently control each blade's angle of attack. This dynamic control allows the system to adapt to varying wind conditions and balance mechanical loads across multiple modules in real-time, reducing the overall mechanical complexity while maintaining high power generation capacity
2Force
If rotor blade pitch is adjusted to create lift force opposing gravity, then dynamic loads on support structure are reduced, but device complexity increases due to control system requirements
Solution Approach 1:
The control system continuously monitors wind conditions, rotor performance, and structural loads, then adjusts the pitch angle of rotor blades in real-time based on this feedback. This closed-loop control enables the system to automatically create lift forces that counteract gravitational loads and balance dynamic forces across multiple modules, reducing support structure demands while managing control complexity through automated feedback mechanisms
Solution Approach 2:
The invention changes the operational parameters of the rotor blades by dynamically adjusting pitch angles to optimize lift force generation. By varying the pitch parameter in response to wind conditions and load requirements, the system can create upward lift forces to counteract gravity and reduce dynamic loads on the support structure, achieving force balance through parameter optimization rather than structural reinforcement
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 enables more efficient handling of dynamic loads, allowing for lighter and more flexible support structures and improved mechanical stability, particularly under varying wind conditions, while maintaining overall system stability even under low wind conditions.
Implementation Method 1
the control system is arranged for applying the lift command to the corresponding rotor blade pitch adjustment system of said particular wind turbine module so as to create a lift force (F_up) in the opposite direction of gravity on the said particular wind turbine module mounted on the support structure
Data Source
AI summary
The invention relates to a wind turbine system (1) with several wind turbine modules (2) mounted to a support structure (3). A control system is configured to determine a lift command (21) for a particular wind turbine module (2′) of the 5 plurality of wind turbines modules (2). The control system is applying the lift command (21) to a corresponding rotor blade pitch adjustment system of the particular wind turbine module (2′) so as to create a lift force (F_up) in the opposite direction of gravity on the particular wind turbine module mounted on the support structure. Providing an upwards lift force on one, or more, particular 10 wind turbine module(s) may reduce, or eliminate, static and/or dynamical loads from the wind turbine module on the support structure.