Wind Turbine Inter-Harmonic Damping With Adaptive Resonant Control
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Solution Overview
Problem
Existing damping systems for inter-harmonics in wind turbines are inefficient, costly, and complex, and current resonant controllers fail to effectively manage these non-integer multiples of the fundamental frequency, especially in varying operational conditions.
Innovation Solution
A control system for wind turbines that includes an inter-harmonic damping control unit with resonant controllers adapted to the operational point, allowing dynamic adaptation and compatibility with existing systems, using SOGI- and ROGI-filter based controllers to independently manage direct and inverse components of inter-harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If damping hardware is added to mitigate inter-harmonics, then inter-harmonic suppression is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent replaces physical damping hardware with a control-based solution using resonant controllers implemented in the power electronic converter. Instead of adding mechanical damping devices to the generator or turbine structure, the invention uses software/control algorithms to generate compensating signals that cancel inter-harmonic components, thereby eliminating the need for additional hardware while achieving the same suppression effect
Solution Approach 2:
The patent introduces resonant controllers as an intermediary element between the power electronic converter and the grid. These controllers act as a mediator that processes the power signals, identifies inter-harmonic components, and generates compensating control signals to suppress them, avoiding direct modification of the generator or turbine hardware
2Object-affected harmful factors
If a new control system is implemented to damp inter-harmonics, then inter-harmonic suppression is improved, but system complexity and implementation cost increase
Solution Approach 1:
The patent integrates the inter-harmonic damping function into the existing power electronic converter control system. The resonant controllers are implemented within the same control architecture that already manages active and reactive power control, making the control system multi-functional. This approach allows the same hardware and control platform to handle multiple control objectives simultaneously, avoiding the need for separate dedicated damping hardware or control systems
Data Source
AI summary
A wind turbine is provided. The wind turbine includes an electric generator, a converter and a control system. The electric generator includes a rotor configured to rotate at different rotation speeds thereby operating at different operation points, and a converter having a rotor side converter and a power consumption system, i.e., grid-side, side converter. The control system includes a current control loop and an inter-harmonic damping control unit arranged in parallel to the current control loop. The inter-harmonic damping control unit damping control unit comprises at least a resonant controller which is dependent on the operation point for tracking and damping the one or more inter harmonic(s) of the wind turbine. A method for damping inter-harmonics is also provided.