Wind Farm Transient Power Boost Control
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Solution Overview
Problem
Wind farms with high penetration levels or larger installations often fail to effectively participate in frequency regulation and power-swing stabilization during grid frequency events, as their power output is independent of system frequency, leading to potential instability and the need for enhanced capabilities.
Innovation Solution
A farm-level control system that receives frequency signals from the grid and implements a control scheme to distribute power commands based on individual output boost capabilities of wind turbine generators, ensuring frequency regulation and power-swing stabilization by adjusting power output, ramp rates, and hold times, while adhering to maximum power limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wind farms operate with power output independent of system frequency, then wind turbines can maintain stable operation and meet grid code requirements, but the wind farm cannot effectively participate in frequency regulation and power-swing stabilization during grid frequency events
Solution Approach 1:
The patent implements dynamic control of wind turbine power output based on real-time grid frequency conditions. The system transitions from static, frequency-independent operation to dynamic, frequency-responsive operation by continuously monitoring grid frequency and adjusting power output accordingly. During frequency events, the controller dynamically modulates active power to provide frequency regulation and power-swing stabilization while maintaining stable operation during normal conditions.
Solution Approach 2:
The system changes operational parameters (power output, ramp rates, hold times) based on grid frequency conditions. The controller adjusts these parameters dynamically: during normal operation, power output remains stable; during frequency events, the system changes power output levels, ramp rates, and hold times to provide frequency regulation services, thus adapting to different operational states.
2Adaptability or versatility
If wind farms provide enhanced transient power boost during frequency events, then frequency regulation and power-swing stabilization improve, but the risk of exceeding maximum power limits increases
Solution Approach 1:
The patent implements a feedback control system that continuously monitors grid frequency, power output, and operational constraints. The controller uses this feedback to dynamically adjust power boost levels, ensuring that enhanced frequency regulation capability is provided while maintaining compliance with maximum power limits. The feedback loop prevents excessive power output by comparing actual power against rated capacity and adjusting commands accordingly.
Solution Approach 2:
The system applies partial power boost action rather than full excessive action. During frequency events, the controller provides enhanced power output to improve frequency regulation, but limits the boost to a controlled extent that does not exceed maximum power limits. The power command is modulated to provide sufficient regulation capability while maintaining reliability through controlled, partial action rather than uncontrolled excessive power delivery.
3Stability of the object's composition
If individual turbine controllers freeze or hold power set point during frequency events, then turbine operation stability is maintained, but the wind farm cannot collectively provide frequency regulation and power-swing stabilization
Solution Approach 1:
The patent merges individual turbine control functions with farm-level coordination. Instead of isolated turbine controllers operating independently, the system combines individual turbine capabilities under unified farm-level control. The farm-level controller aggregates power set points from multiple turbines and coordinates their collective response to frequency events, enabling the wind farm to provide frequency regulation and power-swing stabilization while maintaining individual turbine operation stability through coordinated control.
Solution Approach 2:
The control system performs multiple functions: it maintains individual turbine operation stability through frozen power set points while simultaneously enabling collective frequency regulation and power-swing stabilization at the farm level. The farm-level controller acts as a multi-functional system that coordinates power distribution, manages frequency response, and ensures both turbine-level and farm-level objectives are achieved concurrently.
Data Source
AI summary
A method for controlling a wind farm connected to an electrical grid includes receiving, via a farm-level controller, a frequency signal from the electrical grid. If the frequency signal is indicative of a frequency event occurring in the electrical grid, the method includes implementing, via the farm-level controller, a control scheme for providing frequency regulation and power-swing stabilization for the electrical grid. For example, the control scheme includes receiving, via the farm-level controller, individual output boost capabilities from each of the plurality of wind turbine generators, calculating, via the farm-level controller, a power command based on the individual output boost capabilities and based on one or more grid code requirements of the electrical grid, distributing, via the farm-level controller, the power command to each of the wind turbine generators.