Wind Farm Power Ramp Rate Control via Collective Output Regulation
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Solution Overview
Problem
Wind farms face challenges in controlling power ramp rates due to variability in wind conditions, which can lead to excessive thermal stresses in thermal power plants and inefficient energy capture, as existing methods primarily focus on individual turbines rather than the collective wind farm level.
Innovation Solution
A wind farm control system that monitors and regulates the collective power output of multiple wind turbine generators, generating a power output rate limiting signal to control the rate of change, ensuring compliance with transmission system operators' ramp rate limits while maximizing energy capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power output of thermal power plants is changed instantaneously to match wind farm variability, then overall power balance is improved, but thermal stresses and damage risk to plant components increase
Solution Approach 1:
The control system performs preliminary action by predicting future wind power output using historical data and forecasting models. This allows thermal power plants to be pre-positioned at optimal power levels before wind variability occurs, avoiding instantaneous changes and reducing thermal stress while maintaining power balance.
Solution Approach 2:
The system implements feedback control by continuously monitoring actual wind power output, comparing it with predicted values, and adjusting thermal power plant output accordingly. This closed-loop feedback enables smooth, controlled ramping of thermal plants to match wind variability while respecting thermal stress constraints.
2Object-affected harmful factors
If power ramp rate of wind farms is controlled to match thermal power plant limits, then thermal stress is reduced, but wind energy capture is limited
Solution Approach 1:
The system performs preliminary wind power forecasting to anticipate future wind conditions. By knowing predicted wind output in advance, the control system can plan optimal ramp rates that maximize wind energy capture while ensuring thermal plants can accommodate the changes without excessive stress.
Solution Approach 2:
The control system dynamically adjusts the power ramp rate limits for wind farms based on real-time thermal plant status, wind conditions, and forecasted variability. This dynamic optimization allows maximum wind energy capture at times when thermal plants can accommodate rapid changes, while imposing gentler ramp rates when thermal plants are near their stress limits.
3Speed
If individual wind turbine generators curtail power output to limit ramp rates, then ramp rate control is achieved, but energy capture efficiency decreases
Solution Approach 1:
The system merges the control actions of multiple individual wind turbine generators into a coordinated wind farm-level control strategy. By controlling the aggregate power output rather than individual turbines, the system achieves ramp rate control while allowing each turbine to operate at optimal efficiency, minimizing unnecessary curtailment.
Solution Approach 2:
The control system changes the parameter being controlled from individual turbine power output to aggregate wind farm power output. This parameter transformation allows the system to achieve ramp rate control at the farm level while individual turbines can maintain higher efficiency operation, reducing overall energy capture losses.
Data Source
AI summary
A system and method for controlling power ramp rate of a wind farm is provided. The wind farm includes a plurality of wind turbine generators and a wind farm control system. The wind farm control system is operable to monitor rate of change of collective power output of the wind turbine generators, and to limit the rate of change of collective power output by generating a power output rate limiting signal based on the monitored rate of change of collective power output of the wind turbine generators and a desired collective power ramp of the wind turbine generators and applying the power output rate limiting signal to the plurality of wind turbine generators.