Wind Farm Transformer Control Withholding Switching Signals
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Solution Overview
Problem
Existing wind turbine and wind farm control systems face challenges in integrating wind energy into electrical networks effectively, particularly in managing voltage fluctuations and preventing destabilization of the network during transformer switching operations.
Innovation Solution
A control system with a higher-level controller that withholds transformer control demands until released, implementing a two-stage control process where local conditions trigger a switching assessment, and a higher-level controller decides on actual switching, incorporating a deadband and settling delay to stabilize network operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the transformer controller immediately executes switching operations based on local voltage conditions, then the local voltage control responsiveness is improved, but the electrical network stability deteriorates due to potential destabilizing switching at inappropriate times
Solution Approach 1:
The transformer controller generates control specifications in advance based on local voltage conditions, but executes them only after receiving release signals from the higher-level controller. This preliminary generation followed by conditional execution allows local responsiveness while ensuring network-wide stability through centralized coordination.
Solution Approach 2:
The higher-level controller acts as an intermediary between the transformer controller and the actual switching execution. It receives control specifications from the transformer controller, evaluates them against overall network conditions, and selectively releases or blocks them. This intermediary layer coordinates local control actions with global network stability requirements.
2Measurement precision
If the transformer controller continuously monitors and responds to voltage deviations, then the voltage regulation precision is improved, but the switching operation frequency increases causing network destabilization
Solution Approach 1:
The transformer controller generates control specifications in advance when voltage deviations are detected, but delays actual execution until released by the higher-level controller. This allows precise voltage monitoring while preventing excessive switching by filtering out transient or minor deviations through the release mechanism.
Solution Approach 2:
The system maintains continuous voltage monitoring and control specification generation, but the actual switching action is continuous only when necessary and approved by the higher-level controller. This ensures voltage regulation precision while avoiding unnecessary switching operations that would destabilize the network.
3Stability of the object's composition
If a higher-level controller is introduced to coordinate transformer switching operations, then the electrical network stability is improved, but the control system complexity increases
Solution Approach 1:
The control system is segmented into two functional layers: the transformer controller handles local voltage monitoring and control specification generation, while the higher-level controller manages overall coordination and stability assessment. This segmentation distributes control functions appropriately, improving stability without requiring complete centralization that would create excessive complexity.
Solution Approach 2:
The higher-level controller performs multiple functions: receiving control specifications from transformer controllers, evaluating network conditions, deciding on release or block actions, and managing overall transformer coordination. This multi-functionality consolidates control logic in a single component rather than requiring complex distributed coordination protocols.
Data Source
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AI summary
The invention relates to a control system for a wind turbine (14, 15, 16) or for a wind farm. The control system comprises a transformer controller (22, 23) that processes information about the current state (24) of an electrical network in order to determine a control signal for a transformer (17, 21) with an adjustable turns ratio. According to the invention, a higher-level controller (31, 41) is provided. The transformer controller (22, 23) is designed to withhold the control signal until it is released by the higher-level controller (31, 41). The invention also relates to a corresponding control method. The invention enables the voltage levels in the wind farm and in the wind turbines to be adjusted according to the specific conditions.