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National Repository of Grey Literature

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	Converters for HVDC Energy Transmission Martinec, Roman ; Klíma, Bohumil (referee) ; Červinka, Dalibor (advisor) The aim of this thesis is to introduce the high-voltage direct current (HVDC) systems used in the world today. The work lists the basic principles of connection between individual HVDC stations, as well as the configuration of the HVDC transmission link. In addition, the work describes the topologies of converters currently in use and also their principal semi-conductor components. In the conclusion of the thesis, the HVDC technology is assessed, including its advantages and drawbacks. Detailed record
	Converters for HVDC Energy Transmission Martinec, Roman ; Klíma, Bohumil (referee) ; Červinka, Dalibor (advisor) The aim of this thesis is to introduce the high-voltage direct current (HVDC) systems used in the world today. The work lists the basic principles of connection between individual HVDC stations, as well as the configuration of the HVDC transmission link. In addition, the work describes the topologies of converters currently in use and also their principal semi-conductor components. In the conclusion of the thesis, the HVDC technology is assessed, including its advantages and drawbacks. Detailed record
	IGCT Switches Used for Traction Drives Bartoš, Stanislav ; Jehlička, Vladimír ; Škramlík, Jiří ; Valouch, Viktor ; Večerka, Tomáš So far, the Integrated Gate-Commutated Thyristor (IGCT) has always been considered as a device suitable for converters controlling the power of the order of megawatts or higher. Detailed record
	Short-Circuit Protection of IGCT Voltage Source Inverters through the Use of Semiconductor Fuses Bartoš, Stanislav ; Semerád, Radko ; Škramlík, Jiří The power switching devices IGCT exhibit high values of the parameter I2t. This property enables their short-circuit protection by the so called semiconductor fuses. For both the thyristors and the rapid semiconductor fuses, the parameter I2t is usually defined for a half-sine current wave with the duration of 10 ms. However, in the dc feeding line of an inverter, the short-circuit waveforms are strongly different, and the best way to find the proper fuse for protection is to employ appropriate computer software. Detailed record

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