Master Thesis
Göteborg, SWEDEN Design / Civil engineering / Industrial engineering
Job description
Topic- Insulation Resistance Monitoring for HVDC systems in automotive applications
Background
The high-voltage insulation performance of electric vehicles is critical to their safe operation. As voltage levels increase to reduce current in electric vehicles, the electric field distribution becomes more challenging. This leads to uneven and unbalanced electric fields, which negatively affect the reliability of insulation materials and shorten the lifespan of high-voltage components. Furthermore, the high-voltage, high-power loads in electric vehicles require large capacitance to address electromagnetic compatibility (EMC) issues, increasing the risk to the vehicle's safe operation.
Problem Description
Real-time monitoring of high-voltage insulation performance and prompt response to changes in insulation resistance are essential to ensuring the safe operation of electric vehicles. To overcome the challenges of slow response and poor estimation accuracy of insulation resistance under complex vehicle operating conditions, a comprehensive study of various insulation-resistance-monitoring methods is necessary for automotive applications.
Solution
With recent advancements in state-of-the-art IRM methods for automotive applications, it has become apparent that a thorough study of the existing Volvo method and other suppliers’ methods is necessary. Both in terms of performance and potential improvements in light of the challenges mentioned above.
Goal of the thesis
The thesis will consist of the following stages:
1. Study of:
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High Voltage vehicle architecture
·
State-of-the-art Isolation Resistance Measurements and techniques
2. Theoretical evaluation and assessment, including simulations and calculations.
3. Experimental comparison of the different IRM methodologies previously investigated, with support of real HV testing of both market-existing solutions and today´s Volvo solution. The attributes to compare the different approaches against will be:
a.Reaction time
b.Cost
c.Accuracy
d.Robustness
e.Impact to the vehicle in terms of disturbances
Desirable expertise
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Electronics background and familiar with prototype building
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Familiar with high voltage technology and electric vehicle architecture
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MS student within electric power engineering or power electronics engineering
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Job Category: Technology Engineering
Organization: Group Trucks Technology
Travel Required: No Travel Required
Requisition ID: 14753