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The AC/AC single-phase/single-phase Modular Multilevel Converter (MMC) presents very interesting features for the realization of a Medium Frequency Power Electronic Transformer for traction applications, in AC-fed or multisystem railway rolling stock, like locomotives, Electric Multiple Units (EMU), high-speed units, and so on. Aiming to maximize the output frequency of the converter, i.e. the operating...
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 the reliability of a Modular Multilevel Converter for HVDC applications is incremented, by decreasing the electrical stress of the main passive component suitable to fault, that is, the capacitor cell. This effect is obtained with the injection of a suitable cell second harmonic circulating current. It's important to note how the cell current increment does not increase the semiconductor...
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 stock. The main purpose of these topologies...
Power Conditioning Systems (PCSs), also known as Active Filters or Custom Power, are innovative devices based on Power Electronics widely used on Medium Voltage (MV) and Low Voltage (LV) power transmission networks to improve the quality of power distribution and compensate local disturbances. Some of common features are improving the quality of the power supply of particularly sensitive loads to...
Neutral Point Clamped (NPC) converter topology is one of the most common static conversion structures used in high power medium voltage motor drives. In recent years, fault tolerance has become one of the most interesting features which could be requested by the market, in order to improve drives reliability and availability, thus avoiding the stop of means of transport and/or plants. This paper proposes...
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