Wind Turbine Generator Speed Control via Dynamic Grid Frequency Limits
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Solution Overview
Problem
Existing wind turbine generator control systems fail to optimize power generation when the power grid frequency deviates from nominal, as they rely on fixed speed limits that do not account for variations in grid frequency, leading to inefficient power delivery.
Innovation Solution
A method that dynamically adjusts the generator speed limits based on power grid frequency deviations, allowing for optimized power delivery by controlling the wind turbine blades' pitch and setting dynamic speed limits that adapt to varying grid frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed maximum and minimum speed limits are imposed on the generator, then the load on turbine components is limited, but power generation optimization is prevented when grid frequency deviates from nominal
Solution Approach 1:
The patent applies dynamics by transitioning from fixed speed limits to dynamic speed limits that automatically adjust based on grid frequency conditions. The control system continuously monitors grid frequency and modifies the generator's maximum and minimum speed limits in real-time, allowing the turbine to optimize power capture during frequency deviations while maintaining component protection during normal operation.
Solution Approach 2:
The patent implements parameter changes by modifying the speed limit parameters (maximum and minimum generator speeds) based on grid frequency deviations. When grid frequency deviates from nominal values, the control system adjusts these speed parameters to enable optimized power generation, and restores fixed limits when frequency returns to normal ranges.
2Productivity
If generator speed is controlled to deliver maximum power, then productivity is improved, but component load limits are exceeded during grid frequency variations
Solution Approach 1:
The system dynamically adjusts speed limits based on real-time grid frequency conditions. During frequency deviations, the control system raises or lowers speed limits to optimize power delivery while preventing excessive component loads. This dynamic adaptation allows the turbine to respond appropriately to changing grid conditions without compromising component reliability.
Solution Approach 2:
The control system employs feedback by continuously monitoring grid frequency and using this information to adjust generator speed limits. The feedback loop ensures that speed limits are optimized for power generation when grid frequency is within acceptable ranges, and adjusted to protect components when frequency deviations occur.
3Productivity
If dynamic speed limits are implemented to optimize power generation, then productivity improves, but control system complexity increases
Solution Approach 1:
The patent implements parameter changes by modifying control parameters (speed limits) based on grid frequency measurements. This approach optimizes power generation through relatively simple parameter adjustments rather than complex control algorithms, maintaining ease of implementation while achieving productivity improvements.
Data Source
AI summary
Methods of controlling a variable speed wind turbine generator connected to a power grid. The method may include measuring the frequency, f, of the power grid, controlling the speed of the generator for optimizing the power delivered to the power grid, and setting limits for the generator speed. The setting of the limits for the generator speed is performed in dependency of the measured frequency of the power grid. This provides a dynamical set of limits providing improved possibilities of optimizing the power production.