PUBLICATIONS
Paper
[International Journals] Anto Joseph, Thanga Raj Chelliah, Raghu Selvaraj, and Kyo-Beum Lee, "Fault Diagnosis and Fault-Tolerant Control of Megawatt Power Electronic Converter-Fed Large-Rated Asynchronous Hydrogenerator," IEEE Journal of Emerging and Selected Topics in Power Electronics, vol. 7, no. 4, pp. 2403–2416, Dec. 2019. -SCIE
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In recent years, it has been difficult to achieve power converter redundancy in multi-channel voltage-source inverter (VSI)-fed large
rated doubly fed induction machines (DFIMs), and it has not yet been adopted in any commissioned variable-speed pumped storage
power plants. Multi-channel VSIs are a fundamental part of DFIMs, and they control the real and reactive power of the machines.
This paper presents the fault-tolerant operation of a large rated DFIM hydro-generating unit at open switch faults in back-to-back
VSIs. A technique for diagnosing the open-switch faults in grid-side and machine-side converters is proposed. An open-switch fault
is detected based on the variation in rotor currents and dc link voltage, which reduces the computational efforts during fault
diagnosis. A 250-MW DFIM with five-channel three-level VSIs (each rated at 9 MVA) is simulated in the Matlab/Simulink environment
to observe the drive behavior. Finally, a 2.2-kW DFIM is tested in a laboratory environment to verify the simulation results.
