Wind Turbine Power Feed-in Control via Grid State Sampling
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Solution Overview
Problem
The increasing dominance of wind turbines in electrical grids necessitates improved grid support mechanisms to stabilize and efficiently manage active and reactive power, as existing solutions are limited in their adaptability to network conditions.
Innovation Solution
A method for wind energy installations and wind farms to dynamically adjust active and reactive power feed-in based on network states, utilizing interpolation points and various function types to optimize power control, with active power adjusted according to grid frequency and sensitivity, and reactive power adjusted according to network voltage, allowing for adaptive grid support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wind turbines feed in maximum electrical power into the supply network, then energy production is optimized, but grid stability deteriorates when grid sensitivity increases
Solution Approach 1:
The patent implements dynamic power feed-in adjustment by continuously monitoring grid sensitivity and adapting the active power output accordingly. The control system transitions from static maximum power feed-in to dynamic adjustment based on real-time grid conditions, allowing wind turbines to optimize both productivity and reliability by reducing power feed-in when grid sensitivity increases.
Solution Approach 2:
The patent employs feedback control mechanisms where the control system continuously monitors grid sensitivity parameters and uses this information to adjust the active power feed-in. This closed-loop control ensures that power production is optimized while maintaining grid stability, as the system responds to grid conditions and adjusts output accordingly.
2Ease of operation
If fixed active power is fed in regardless of grid conditions, then control simplicity is maintained, but adaptability to network states deteriorates
Solution Approach 1:
The patent changes the control parameter from fixed active power to variable active power based on grid sensitivity. The control system adjusts the active power setpoint dynamically according to monitored grid conditions, enabling adaptability to different network states while maintaining a relatively simple control architecture through parameter-based adjustment.
3Device complexity
If reactive power is not adjusted according to network voltage, then device complexity is reduced, but grid support capability deteriorates
Solution Approach 1:
The patent adjusts the reactive power parameter dynamically based on network voltage conditions. The control system monitors voltage levels and modifies the reactive power output accordingly, enhancing grid support capability through parameter adaptation while keeping the control mechanism relatively simple through direct voltage-reactive power relationship management.
Data Source
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AI summary
The invention relates to a method for feeding electric power from at least one wind energy installation (100) or a wind farm (112) into an electric power supply system (120) at a mains voltage (U) and a mains frequency (F), wherein the method is prepared for feeding in electric active power (P) and electric reactive power (Q), and the active power (P) that is fed in can be set by means of an active power controller (R1, R2) on the basis of a system state (U, f) and/or the reactive power (Q) that is fed in can be set by means of a reactive power controller on the basis of at least one system state (U, f) and the active power controller (R1, R2) and the reactive power controller prescribe a setpoint value that is to be fed in that is set in each case by means of a setting function (Fs) on the basis of at least one system state (U, f), wherein the setting function (Fs) is prescribed by using sampling points (ST1, ST2, ST3) that are defined by pairs of values ([Pi, fi]) comprising, in each case, a value for the active power (P) or reactive power (Q) and a value for the system state (U, f).