Wind Park Damping Control for Turbine Oscillation and Grid Stability
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Solution Overview
Problem
Conventional methods for damping mechanical oscillations in wind turbines are not sufficiently effective across all conditions to meet grid operator requirements, particularly during faults, leading to undesired power output oscillations and increased mechanical stress.
Innovation Solution
A method and arrangement where a wind park controller determines and supplies damping control signals to wind turbines to counteract oscillations, ensuring the sum of these signals is below a threshold, allowing active damping during or after grid faults, thereby reducing mechanical stress and maintaining stable power output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional damping methods are applied to wind turbines, then mechanical oscillations are reduced, but power output oscillations increase and grid stability deteriorates
Solution Approach 1:
The patent combines damping control signals from multiple wind turbines into a coordinated group control strategy. By merging the control actions of multiple turbines and adjusting their collective output, the system achieves mechanical oscillation damping while compensating for power output variations through the group, thereby maintaining grid stability.
Solution Approach 2:
The patent introduces a park-level control system as an intermediary between individual turbine controllers and the grid. This intermediary coordinates damping signals across multiple turbines, manages the aggregation of power output oscillations, and ensures that collective damping actions meet grid stability requirements.
2Stability of the object's composition
If damping control signals are supplied to all wind turbines, then mechanical oscillations are effectively damped, but the sum of damping signals exceeds the threshold causing power output instability
Solution Approach 1:
The patent segments the wind park into multiple damping control groups, where each group receives coordinated damping signals. By dividing the park into segments and controlling each segment's damping contribution, the system ensures that the sum of damping signals remains below the threshold while still achieving effective oscillation damping within each group.
Solution Approach 2:
The patent applies partial damping action by supplying damping control signals to only certain wind turbines within groups rather than all turbines uniformly. This selective partial action allows the system to achieve sufficient mechanical damping while keeping the aggregate damping signal sum below the threshold that would cause power output instability.
3Stability of the object's composition
If damping control is applied during grid faults, then mechanical oscillations are reduced, but mechanical stress on components increases
Solution Approach 1:
The patent employs periodic damping control actions that are modulated according to grid conditions. During grid faults, the system applies damping signals in a periodic manner with adjusted amplitude and timing, reducing mechanical oscillations while limiting the cumulative mechanical stress on components through controlled periodic intervention rather than continuous maximum damping.
Data Source
AI summary
Provided is a method of damping mechanical oscillations of plural wind turbines of a wind park commonly supplying electric energy to a grid, the method including: determining, for each of the plural wind turbines, a damping control signal for counteracting an oscillation of the respective wind turbine; supplying at least a subset of or a subset of modified versions of the damping control signals to respective wind turbines such that a sum of the supplied damping control signals is lower than a threshold.