Line Side Crowbar Circuit for Wind Turbine Overvoltage Protection
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Solution Overview
Problem
Wind turbines face failures that lead to overvoltage events causing high currents, which do not blow fuses but can result in equipment overheating and damage due to insufficient voltage reduction, posing a risk to electrical components.
Innovation Solution
A crowbar circuit is integrated between the wind turbine and transformer, equipped with sensors and a computing unit to detect overvoltage events, diverting excessive current and raising it to a level that blows a fuse, thereby preventing damage to electrical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fuse is used to protect against overcurrent, then simple protection is provided, but it fails to detect dangerous conditions where current is high but voltage remains normal
Solution Approach 1:
The system performs preliminary detection by continuously monitoring both voltage and current before dangerous overheating occurs. The controller compares measured values against expected relationships to identify abnormal conditions in advance, allowing preventive action before damage happens.
Solution Approach 2:
The controller acts as an intermediary between the electrical components and the protection mechanism. It processes sensor signals from voltage and current sensors, analyzes the relationship between these parameters, and triggers the crowbar circuit when abnormal patterns are detected, providing intelligent protection beyond simple fuse operation.
2Object-affected harmful factors
If no crowbar circuit is used, then device complexity is low, but electrical equipment overheats and burns due to undetected dangerous current conditions
Solution Approach 1:
The system implements feedback control by continuously measuring voltage and current, comparing actual values against expected operational relationships, and adjusting protection actions based on this comparison. When the relationship between voltage and current deviates from normal patterns indicating dangerous conditions, the system triggers the crowbar circuit to restore safety.
Solution Approach 2:
The controller serves as an intermediary that coordinates between the sensors and the crowbar circuit. It processes information from voltage and current sensors, determines when dangerous conditions exist based on parameter relationships, and activates the crowbar protection mechanism, creating an intelligent protection system.
3Productivity
If voltage remains normal during fault conditions, then normal operation continues, but hidden dangers progress to equipment damage
Solution Approach 1:
The system takes preliminary protective action by monitoring the relationship between voltage and current before equipment damage occurs. Even when voltage appears normal, the controller detects abnormal current patterns and their relationship to voltage, triggering early protection to prevent progression to dangerous overheating and equipment failure.
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
The solution effectively prevents overvoltage events from damaging wind turbine and transformer components by detecting and mitigating destructive currents, ensuring safe operation and reducing the risk of equipment failure.
Implementation Method 1
raising the current to a level that causes the blowing of at least one fuse associated with the transformer
Data Source
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AI summary
A line side crowbar circuit (140) for an energy converter (105) is disclosed. In one aspect there is a power unit (100) that includes an energy converter (105); a transformer (130) configured to transfer electrical energy generated from the energy converter (105) to an electrical grid; and a crowbar (140) coupled to the energy converter (105) and the transformer (130) that is configured to prevent an overvoltage event from damaging electrical components associated with the energy converter (105) and the transformer (130).