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An exhaustive study on the circulating currents and their consequences in modular multilevel converters for HVDC applications is presented. The first part is a review of an analytical study of the converter, aimed to minimize the capacitors voltage ripple. In the second part the effects on the system efficiency are presented.
A detailed analysis of the behaviour of a Modular Multilevel Converter (MMC) in a HVDC system, in case of both DC and AC faults, is provided. Results related to a two-terminal HVDC system are presented.
A new generalized space vector modulator for cascaded multilevel converters is presented, featuring centralized control, fault tolerant and common mode voltage reduction capabilities. The SVPWM technique is based on the redundancy properties inherent in multilevel modulation schemes and is validated through a case study. Simulation and experimental results… (More)
High-power converters with a medium frequency inductive coupling, commonly referred as Power Electronic Transformers, Medium Frequency Topologies, Solid-State Transformers (SST), or other similar acronyms, have been certainly one of the most important innovations expectations - for many years - in the field of electrical equipment of the railway rolling… (More)
In this paper the effects of the circulating currents on the modular multilevel converter, for HVDC applications, are presented. The first part is a review of an analytical study of the converter, aimed to minimize the capacitors rms current. In the second part the effects on the converter efficiency and on the safe operating area (SOA) margins are studied.
In this paper an exhaustive analysis of the utilization of the second harmonic component of the circulating currents in a modular multilevel converter for HVDC application is presented, with the aim of highlighting the effects on the maximum arm energy ripple, i.e. capacitors voltage ripple, and on semiconductor losses. Simulation results are presented and… (More)