Transformer Winding Current Limit Control
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Solution Overview
Problem
Conventional wind turbine transformers are limited by fixed current ratings, which restrict their ability to operate at higher voltages, preventing optimal energy capture and production due to inflexible operating limits.
Innovation Solution
A method and system for dynamically adjusting the current limits of transformer windings based on real-time electrical conditions, using sensors and control devices to apply multipliers that modify initial operating limits in response to voltage changes, allowing for increased energy capture and production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed current limit is specified for the transformer at the design stage, then the transformer is protected from overheating and damage, but the transformer cannot operate at higher voltages and the wind turbine cannot capture optimal energy
Solution Approach 1:
The patent applies dynamics by transitioning from a static fixed current limit to a dynamic adaptive current limit that automatically adjusts based on real-time transformer temperature measurements. The control system continuously monitors temperature and modifies the current limit accordingly, allowing the transformer to operate at higher currents when cool and reduce currents when hot, thus expanding the operating range while maintaining protection.
Solution Approach 2:
The patent implements parameter changes by modifying the current limit parameter based on temperature conditions. When the transformer temperature is below a threshold, the current limit is set to a higher value allowing increased power output; when temperature exceeds the threshold, the current limit is reduced to prevent overheating. This dynamic parameter adjustment resolves the contradiction between maximizing energy capture and maintaining transformer protection.
2Productivity
If the current limit is increased to allow higher power output, then energy capture improves, but the transformer may overheat and suffer damage
Solution Approach 1:
The patent employs feedback by implementing a closed-loop control system that continuously monitors transformer temperature and uses this information to adjust the current limit. Temperature sensors provide real-time feedback to the control system, which then modifies the current limit setting to maintain safe operating temperatures while maximizing power output. This feedback mechanism ensures transformer reliability is maintained even when operating at higher power levels.
Solution Approach 2:
The patent applies beforehand cushioning by proactively reducing the current limit before the transformer reaches dangerous temperature levels. The control system monitors temperature trends and preemptively adjusts the current limit to prevent overheating, rather than waiting for critical temperatures to be reached. This preventive approach protects the transformer from damage while still allowing optimal power output within safe temperature boundaries.
3Adaptability or versatility
If a fixed current limit is used, then the control system is simple, but the transformer cannot adapt to varying voltage conditions and optimal energy production is prevented
Solution Approach 1:
The patent implements self-service by enabling the control system to automatically adjust the current limit based on temperature measurements without requiring manual intervention or complex external control. The system monitors its own temperature state and autonomously modifies operating parameters to optimize performance while maintaining protection. This self-adjusting capability provides adaptability to varying conditions while keeping the control system relatively simple.
Data Source
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AI summary
A method 200 for controlling a transformer includes specifying 202, in one or more control devices 174, an initial operating limit e.g. an initial current limit or an initial temperature limit for one or more windings 128, 130 of the transformer 180. Further, the method 200 includes monitoring 204, via one or more sensors 183, 185, at least one electrical condition of the one or more windings 128, 130 of the transformer 180 e.g. current or voltage. The method 200 also includes receiving 206, by the one or more control devices 174, a signal indicative of the at least one electrical condition of the one or more windings 128, 130 of the transformer 180. As such, the method 200 further includes adjusting 208, by the one or more control devices 174, the initial operating limit based at least in part on the at least one electrical condition of the one or more windings 128, 130 of the transformer 180.