Design Of A Three Phase AC-Side Common-Mode Inductor
In recent years, switch-mode power electronic converters have gained considerable popularity
because of their compact size and high switching frequencies. This makes them
suitable for power processing in various applications, including photovoltaic systems and
electric vehicles. However, their high switching frequency capabilities have a drawback. A
high-frequency common-mode voltage coupled with the switching of the power converters
excites the parasitic capacitances of the system. It leads to the flow of common-mode current.
Since the common-mode current flows through an unintended path, it can potentially
interfere with the performance of system components. Passive filters can be used to mitigate
common-mode currents. Using a common-mode inductor in conjunction with strategically
placed capacitors makes it possible to limit the flow of common-mode current.
As part of this work, passive mitigation of common-mode current will be investigated in
a variable frequency drive system. In this regard, the process of designing a three-phase ac
common-mode inductor is explained. As a first step, a mitigation strategy is proposed and
described. Next, the issue of self-capacitance of the inductor is discussed. Afterwards, the
ac common-mode inductor is designed using a multi-objective optimization-based approach.
Following this are the design results, concluding the dissertation.
- Master of Science in Electrical and Computer Engineering
- Electrical and Computer Engineering
- West Lafayette