Wind Farm Control Unit Predefined Switching State for Grid Recovery
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Solution Overview
Problem
Wind farms often disconnect from the electrical power supply grid during faults, leading to insufficient energy for self-startup and inability to contribute to grid recovery.
Innovation Solution
A method for controlling wind power installations or wind farms that involves detecting grid faults, disconnecting from the grid using control units, testing energy storage, and switching to a predefined state to enable startup, allowing remote restart and contribution to grid recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wind farm disconnects from the electrical power supply grid during grid faults, then the wind farm is protected from damage, but the wind farm loses the ability to contribute to grid recovery and may lack sufficient energy for self-startup
Solution Approach 1:
The control unit switches electrical switches to a predefined switching state before the electrical store is completely discharged, preparing the wind farm for potential self-startup and grid recovery contribution in advance, rather than waiting until energy depletion occurs
Solution Approach 2:
The system dynamically adjusts the switching state based on the remaining energy in the electrical store, transitioning from a protected disconnected state to a predefined switching state that enables self-startup when sufficient energy is available, optimizing both protection and recovery contribution
2Productivity
If the wind farm remains connected to the grid during faults, then it can immediately contribute to grid recovery, but it risks damage from voltage fluctuations and grid instability
Solution Approach 1:
The predefined switching state is configured in advance to enable self-startup capability, allowing the wind farm to safely reconnect and contribute to grid recovery only when conditions are favorable and sufficient energy is available in the electrical store
Solution Approach 2:
The wind farm uses its own electrical store and predefined switching state configuration to autonomously determine when it can safely reconnect and contribute to grid recovery, without requiring external assistance for startup
3Productivity
If the control unit switches to a predefined switching state before electrical store depletion, then self-startup becomes possible, but energy is consumed during the switching process
Solution Approach 1:
The control unit continuously monitors the energy level in the electrical store and uses this feedback to determine the optimal moment to switch to the predefined switching state, ensuring the transition occurs when sufficient energy is available while minimizing unnecessary energy consumption
Data Source
AI summary
A method for controlling a wind power installation or a wind farm is provided. The method includes establishing that there is a grid fault within an electrical power supply grid operated by a grid operator and to which the wind power installation or the wind farm is electrically connected via a point of common coupling; switching electrical switches of the wind power installation or the wind farm using a control unit of the wind power installation or the wind farm which is operated by a low-voltage power supply, so that the wind power installation or the wind farm is voltage-free; testing an electrical store for ensuring the low-voltage power supply once the grid fault has been established; and switching further electrical switches of the wind power installation or the wind farm to a predefined switching state in which start-up of the wind power installation or the wind farm is possible.