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HVDC TRANSMISSION SYSTEM USING MULTILEVEL POWER CONVERTERS BASED ON DUAL THREE-PHASE TWO-LEVEL INVERTERS ABSTRACT Multilevel converters are now an attractive solution for high-voltage direct-current (HVDC) electrical energy transmission systems. Unlike the well-known two-level voltage source converters, multilevel converters use 3 or more voltage levels or steps per leg to modulate the ac voltages, decreasing voltage distortion and reducing electromagnetic interference. This work presents a HVDC transmission system based on a new multilevel structure using a dual two-level converter topology. This structure attains multilevel operation and advantages using two well known three-phase voltage source two-level inverters connected to one three-phase open windings transformer. CIRCUIT DIAGRAM EXISTING SYSTEM Initially thyristor based current source converters (CSC) were used in HVDC systems to transmit power of production sites very far from consumers, or to make asynchronous interconnections. Long distance transmission HVDC systems do not need reactive compensation as required by HVAC transmission systems. HVDC allows also for a transmission capacity increase. In fact, for a given conductor cross section, HVDC transmission can carry more current through a conductor comparedwith conventional HVAC transmission. Recently backto- back HVDC links using voltage source converters (VSC) are used for the interconnection of asynchronous networks, eliminating the harmonics filters needed in CSC HVDC. PROPOSED SYSTEM The well known VSC HVDC transmission structure consists in a combination of a DC cable or line with two power electronics converters, each one at a link terminal for AC/DC and DC/AC conversion. The power electronic converters are usually two level VSC converters with series connected semiconductor devices. To obtain AC voltage waveforms with several voltage levels, instead of the classical VSC topology, multilevel topologies like the neutral-point clamped or the modular multilevel converter have been proposed. Instead of the classical structure, a HVDC transmission structure with two DC links, as presented , is proposed. In this HVDC system two three-phase two level H-bridge converters (VSC) connected in each side of the link terminal are used. These two VSCs are connected to the open-end secondary windings of a three phase transformer TOOLS AND SOFTWARE USED: MP LAB ORCAD/PSPICE MATLAB/SIMULINK OUTPUT: HARDWARE SIMULATION