Wind Turbine Active Power Control via Dynamic Demand Adjustment
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Solution Overview
Problem
Conventional wind turbine generators face challenges in stabilizing active power supply to the grid due to large fluctuations in rotor speed, leading to excessive active power delivery and instability in the utility grid's voltage and frequency.
Innovation Solution
A wind turbine generator system that adjusts active power demand values at a predetermined rate, using a changing unit to calculate and apply a change rate for active power adjustments, thereby minimizing sharp changes in active power supply and stabilizing grid frequency and voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the active power demand value is adjusted rapidly to meet grid requests, then the responsiveness to grid demand is improved, but the stability of the utility grid deteriorates due to excessive power fluctuations
Solution Approach 1:
The patent implements dynamic adjustment of the active power demand value based on current grid conditions and operational state. The system continuously adapts the maximum active power demand value according to real-time rotor speed fluctuations and grid requirements, rather than using a fixed or rapidly changing setpoint. This dynamic approach allows the system to respond to grid demands while maintaining stability by adjusting parameters smoothly based on actual operating conditions.
Solution Approach 2:
The patent employs feedback control by continuously monitoring the rotor speed and active power output, and using this information to adjust the active power demand value. The system reads the current operational state and modifies the maximum active power demand value accordingly, creating a closed-loop control system. This feedback mechanism ensures that active power adjustments are made in response to actual system conditions, preventing excessive fluctuations while maintaining grid responsiveness.
2Power
If the maximum active power demand value is set to the rated value, then the power output capability is maximized, but the grid stability deteriorates due to large active power fluctuations from rotor speed variations
Solution Approach 1:
The patent changes the parameter of maximum active power demand value from a fixed rated value to a dynamically adjusted value. The system modifies this parameter based on the relationship between rotor speed and active power output, setting the maximum demand value to prevent excessive active power generation during high rotor speed conditions. This parameter change allows the system to maintain high power output capability when appropriate while preventing grid instability during conditions that would cause large fluctuations.
3Stability of the object's composition
If the active power demand value is adjusted to suppress grid fluctuations, then the grid stability is improved, but the responsiveness to grid demand deteriorates
Solution Approach 1:
The system dynamically adjusts the maximum active power demand value based on real-time operational conditions and grid requests, rather than using a fixed conservative limit. This dynamic adjustment allows the system to be responsive to grid demand when conditions permit, while only suppressing active power when necessary to maintain stability. The adaptability ensures both grid stability and responsiveness are optimized based on actual operating conditions.
Solution Approach 2:
The patent modifies the maximum active power demand value parameter dynamically based on the relationship between rotor speed and active power output. By changing this parameter according to current operational state and grid requirements, the system achieves an optimal balance between suppressing harmful fluctuations and maintaining responsiveness to legitimate grid demand, rather than using a fixed restrictive value.
Data Source
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AI summary
An object of the invention is to enable a control on active power according to a request of a utility grid. In a case where a request for changing a maximum value of active power and a newly defined maximum value of active power are received from the utility grid side, a maximum value of an active power demand value set to a rated value is changed to the newly defined maximum value of active power at a predetermined change rate or less. There are provided a detecting unit (rotor speed detecting unit) 50 for detecting a parameter related to an operation state, and an demand value obtaining unit 51 for obtaining an active power demand value corresponding to the operation state parameter detected by the detecting unit 50 based on first information in which a parameter related to an operation state and an active power demand value are associated with each other. In a case where a request for changing a maximum value of active power and a newly defined maximum value of active power are received from the utility grid side, the maximum value of the active power demand value in the first information, which is set to the rated value, is changed to the newly defined maximum value of active power at the predetermined change rate or less.