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Thermal Performance of Modular Multilevel Converters in HVDC Applications under Offset PWM
Harith R. Wickramasinghe,Weiyao Wang,Ke Ma,Georgios Konstantinou 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
The total number of submodules (SMs) in a modular multilevel converter (MMC) can be utilized by considering an offset in the arm currents in order always operate at the maximum duty cycle. This article presents the thermal performance of an MMC for an HVDC application when considering its operation under offset PWM. It is demonstrated that the reduction of the total energy in the SM capacitors and the improved performance under faults with lower overall losses but with a variation in the distribution of losses among the devices within an SM. Simulation results based on detailed thermal models as well as experimental cases with thermal behavior demonstrate the impact of offset PWM in an MMC for HVDC applications.