Wind Turbine Speed Control Offset Module for Grid Stabilization
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Solution Overview
Problem
Wind energy installations experience a power drop after providing additional power to stabilize the grid, leading to potential instabilities in mechanical and electrical systems.
Innovation Solution
An offset module is introduced between the speed control and power control to generate an offset signal, which is added to the setpoint speed signal, allowing for a controlled and gradual transition back to normal operation, thereby reducing the power drop and maintaining system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wind turbine provides requested additional power to stabilize the grid by extracting energy from rotor inertia, then the primary control reserve is improved, but the power output drops after additional power provision
Solution Approach 1:
The offset module proactively increases the target rotational speed signal before the actual speed can drop, preparing the system in advance to counteract the expected power drop. This preliminary action prevents the power drop rather than reacting to it after occurrence.
Solution Approach 2:
The control system continuously monitors the actual rotational speed and compares it with the target rotational speed, using this feedback to adjust the offset signal dynamically. This closed-loop control ensures the power output remains stable by responding to actual system conditions.
2Speed
If the wind turbine transitions back to normal operation after providing additional power, then the rotational speed is restored, but a sudden transition causes instabilities in mechanical and electrical systems
Solution Approach 1:
The offset module dynamically adjusts the target rotational speed signal based on the current operating state, smoothly transitioning between normal operation and additional power provision modes. This dynamic adjustment prevents abrupt changes that would cause mechanical and electrical instabilities.
Solution Approach 2:
The system prepares for the transition back to normal operation by gradually adjusting the offset signal, cushioning the transition to prevent sudden shocks to the mechanical and electrical systems. This gradual transition maintains system stability throughout the mode change.
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(c)
AI summary
The invention relates to a wind turbine comprising a wind rotor (12), a generator (14) driven by it, which interacts with a converter (15) to generate electrical power, a speed control (21), and a power control unit (25) interacting with it, wherein the speed control (21) outputs a target speed signal (nset). According to the invention, an offset module (100) is provided between the speed control (21) and the power control unit (25), which is designed to generate an offset signal (noffset) and add it to the target speed signal (nset). The wind turbine according to the invention makes it possible to reduce a power drop after a requested additional power output. The invention further comprises a corresponding method for operating a wind turbine.