Wind Turbine Controller Frequency Response
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Solution Overview
Problem
Existing wind turbine parks are not effectively utilized to provide frequency-responsive reserves during under-frequency conditions, leading to under-utilization of available wind power and inefficient frequency control, as they are typically controlled according to a conventional droop characteristic that fails to harness their full capacity.
Innovation Solution
Wind turbine parks are controlled to rapidly increase output to 100% of available power when an under-frequency condition exceeds a predetermined threshold, exceeding the conventional droop characteristic, allowing for faster and more significant frequency stabilization, and can also operate with discrete power steps or non-linear trajectories to optimize response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wind turbine parks are controlled according to conventional droop characteristic, then frequency control is maintained, but available wind power is under-utilized during under-frequency conditions
Solution Approach 1:
The control system dynamically adjusts the power output of wind turbine parks based on grid frequency conditions. During under-frequency events, the controller rapidly increases power output to 100% of available capacity, transitioning from normal droop operation to emergency full-power mode, thereby optimizing both frequency support and wind resource utilization
2Productivity
If wind turbine parks operate at full capacity continuously, then maximum power is generated, but ability to respond to under-frequency events is reduced
Solution Approach 1:
The control system pre-establishes the capability to rapidly transition to full power output by maintaining turbines in a ready state with control systems primed for immediate response. This preliminary preparation enables the park to deliver full power within seconds of an under-frequency event, rather than requiring gradual ramp-up from partial operation
3Stability of the object's composition
If conventional droop control is used, then gradual frequency adjustment is achieved, but rapid frequency stabilization is not accomplished
Solution Approach 1:
The control system implements a threshold-based trigger mechanism that activates full-power mode when frequency drops below a predetermined threshold. This preliminary anti-action counteracts the frequency decline by immediately deploying maximum available wind power, preventing further frequency degradation and enabling faster stabilization compared to gradual droop response
Data Source
AI summary
A wind turbine generator park (1) for supplying power to a power system (37), the park having an assigned first droop response characteristic for use in responding to an under-frequency occurrence on the power system (37). The park comprises a first comparator (108) for generating a first signal when the park is operating according to a curtailed condition, a second comparator (100) for indicating that a change in a frequency of a voltage or current on the power system (37) is greater than a first threshold value, and a controller (114) responsive to the first and second signals for controlling the park according to a second response characteristic causing the park (1) to supply an amount of power to the power system (37) greater than the power supplied according to the first droop response characteristic.