Wind Turbine Generator Control for Grid Frequency Stability
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Solution Overview
Problem
Existing wind turbine generator control methods fail to maintain grid stability by only adjusting power output when frequency rises, neglecting potential frequency drops, which can lead to unstable utility grids.
Innovation Solution
A control method for wind turbine generators that decreases power output when the grid frequency exceeds a predetermined level and the rotational speed is below a certain threshold, and increases power output when the rotational speed exceeds this threshold to prevent over-speed, using a control device to manage the power output and rotational speed in response to grid frequency fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power output is controlled only when frequency rises, then frequency stabilization is partially achieved, but grid stability cannot be maintained when frequency drops
Solution Approach 1:
The control method dynamically adjusts power output based on real-time frequency conditions, switching between different control strategies: when frequency rises above rated frequency, power output is decreased; when frequency drops below rated frequency, power output is increased. This dynamic adaptation ensures comprehensive grid stability support across all frequency fluctuation scenarios.
Solution Approach 2:
The invention changes the control parameter (power output) in response to frequency parameter variations. By monitoring frequency deviations from the rated frequency and adjusting power output accordingly, the system adapts to different grid conditions, achieving both frequency rise and drop stabilization.
2Reliability
If power output is decreased when frequency rises, then frequency stabilization is achieved, but generator rotational speed may increase causing over-speed risk
Solution Approach 1:
The control system implements feedback by continuously monitoring both frequency and rotational speed, and adjusting power output based on the combined state of these parameters. When frequency rises and rotational speed is below the second threshold, power output is decreased to stabilize frequency. When rotational speed approaches the second threshold, the control adjusts to prevent over-speed while maintaining frequency stability.
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
This approach stabilizes the utility grid by adjusting power output in response to both rising and falling frequencies, ensuring grid stability and preventing generator over-speed.
Implementation Method 1
a generator that is driven by rotation of the rotor
Implementation Method 2
a rotor that rotates by wind power
Data Source
Figure 1
Figure 2
Figure 3
AI summary
It is an object to stabilize utility grid even when an unexpected fluctuation in the frequency of the utility grid occurs. A wind turbine generator (1) includes a rotor (7) that rotates by wind power, a generator (5) that is driven by rotation of the rotor (7), and a control device (20) that controls a power output of the generator (5) to increase while a rotational speed of the generator (5) decreases when a frequency of a utility grid (13) becomes smaller than or equal to a predetermined rated frequency and when the rotational speed of the generator (5) is greater than or equal to a first predetermined value. In this way, even when the frequency of the utility grid (13) fluctuates, the frequency fluctuation can be suppressed, and the utility grid (13) can be stabilized.