HVDC PLUS- Modular Multilevel Converter Seminar Report

HVDC Seminar Report

The seminar presents an actual view into the development of High Voltage Direct Current (HVDC) PLUS converter stations build in Modular Multilevel Converter (MMC) topology. This modern type of self-commutated converters has been developed under brand name HVDC PLUS by Siemens for use in electric power systems. VSC converters for HVDC applications have been based on two or three-level converter topologies consists of high number of semiconductor devices with blocking capability of a few kilovolts are connected in series up to several hundred per converter arm, depending on the DC voltage. To ensure uniform voltage distribution not only statically but also dynamically, all devices connected in series in one converter arm have to switch simultaneously. High and steep voltage steps are applied at the AC converter terminals which cause high component stresses and require extensive ltering measures. The MMC consists of a large number of simple voltage sourced converter (VSC) sub modules that can be easily assembled into a converter for high-voltage and high power. The MMC converter has a fast response and low harmonic content in comparison with a two-level VSC option. By using Modular Multilevel Converter (MMC) both the size of voltage steps and the related voltage gradients can be reduced or minimized.The more steps that are used, the smaller is the proportion of harmonics and the lower is the high-frequency noise. In the case of DC transmission, HVDC PLUS with VSCs is the preferred technology for interconnection of islanded grids, such as o shore wind farms, with the power system.

>Classical HVDC system

>HVDC Light(ABB)

>HVDC PLUS(Siemens)

>Schematic representation of HVDC PLUS

>Modular multilevel converter

>Simulation Of HVDC System

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