Sievietes karos un militāros konfliktos Livonijā no 13. gadsimta līdz 17. gadsimta sākumam

Cover for Volume.13, No.3

Cover vol. 13, no. 5, October 2016

Cover for Volume.13, No.2

Cover for Volume.13, No.4

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Voltage Source Converter (VSC) based HVDC is the most recent HVDC technology with extruded DC cables in small and medium power transmission. VSC-HVDC converters include Insulated Gate Bipolar Transistors (IGBT’S) and operated with high frequency Pulse Width Modulation (PWM) in order to get high speed control of both active and reactive power. With VSC-HVDC there is an addition degree of freedom...