Wind Farm Overboost Control for Grid Frequency Support
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Solution Overview
Problem
Wind turbine generators face challenges in predictably delivering power and regulating grid frequency due to natural variations in wind conditions, leading to unsuitable power generation and instability in electrical grids.
Innovation Solution
A control method and system for wind power plants that determine the need for overboosting, allocate overboost capacity among wind turbine generators based on their individual capabilities, and stagger the overboosting and recovery periods to ensure stable power output and grid frequency regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wind turbine generators operate at maximum power output to meet power demand, then power delivery capability is improved, but reliability deteriorates due to excessive wear and potential damage from continuous high-power operation
Solution Approach 1:
The patent implements periodic overboosting cycles where wind turbines alternately operate at elevated power output and normal power output. The controller monitors cumulative overboosting exposure and cycles turbines between overboosting and normal operation, preventing continuous high-power operation while maintaining overall power delivery capability. This periodic action resolves the contradiction by providing power when needed without subjecting turbines to relentless high-stress operation.
Solution Approach 2:
The system performs preliminary assessment of overboosting requirements by monitoring power demand signals and environmental conditions before initiating overboosting. The controller determines whether overboosting is actually needed based on grid requirements and wind conditions, then selectively applies overboosting only when necessary. This preliminary evaluation prevents unnecessary high-power operation that would contribute to wear, while still enabling power delivery when genuinely required.
2Productivity
If wind turbine generators provide overboosted power output to meet power demand, then power delivery is improved, but device complexity increases due to additional control mechanisms and monitoring systems
Solution Approach 1:
The controller performs multiple functions using a single integrated system: it monitors power demand signals from the grid, assesses environmental wind conditions, determines overboosting requirements, manages individual turbine overboosting operations, and tracks cumulative exposure across the wind farm. This multi-functionality reduces the need for separate dedicated systems for each task, thereby limiting the increase in device complexity while achieving comprehensive overboosting management.
Solution Approach 2:
The patent combines the overboosting control logic with the existing wind farm management infrastructure. The controller integrates overboosting decision-making with routine operational monitoring, merging multiple control functions into a unified system rather than adding entirely separate control mechanisms. This merging approach enables sophisticated overboosting management while minimizing the incremental complexity burden.
3Stability of the object's composition
If wind turbines operate in overboosting mode to regulate grid frequency, then grid stability is improved, but loss of energy increases due to kinetic energy depletion from rapid rotor deceleration
Solution Approach 1:
Before initiating overboosting, the system performs preliminary assessment of wind conditions and power demand to determine whether overboosting is truly necessary. By evaluating the situation in advance, the system avoids unnecessary overboosting events that would deplete kinetic energy reserves, thereby reducing energy loss while still maintaining the capability to provide frequency regulation when genuinely required for grid stability.
Solution Approach 2:
The system implements periodic overboosting cycles with alternating periods of elevated and normal power output. During non-overboosting periods, turbines operate at normal power levels, allowing kinetic energy to be replenished through steady wind operation. This periodic alternation between overboosting and recovery phases reduces cumulative kinetic energy depletion while maintaining the ability to provide grid stability support when needed.
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
The method ensures that wind power plants can meet power demands by optimizing overboosting across multiple generators, smoothing power output, and maintaining grid stability by evenly distributing wear and recovery periods.
Implementation Method 1
a first wind turbine generator (WTG) of the plurality of WTGs increases its power output through overboosting
Implementation Method 2
the additional power output provided through overboosting may be derived from the kinetic energy of the rotor during its power generation operation
Data Source
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AI summary
A method and control arrangement are disclosed for controlling power output of a wind power plant (WPP) including a plurality of wind turbine generators (WTGs). The method includes determining that overboosting is required for the WPP to meet a power demand at the WPP, and determining, for at least a first WTG of the plurality of WTGs, a corresponding amount of overboost capacity. The method further includes generating, based on the determined amount of overboost capacity, control signals causing the first WTG to increase its power output through overboosting to thereby fulfill at least a portion of the power demand.