Transmissão HVDC-ICC e retificação industrial: uma abordagem empregando novas topologias de conversores de 24 e 48–pulsos de alto desempenho para mitigação harmônica

Abstract

Power quality improvement, reliability and availability of electrical power are significant concerns in power systems. In this context, multi-pulse converters are interface devices between the AC electrical system and the DC link, widely used in HVDC–TS (HVDC Transmission System) and industrial rectification of very high currents to meet harmonic requirements on both the AC and DC sides of the converter system. This thesis proposes 24 and 48–pulse converter structures for reducing AC and DC filters in conventional HVDC–TS and for excellent harmonic mitigation in industrial rectification, respectively, using special three-winding transformers with ZZ–Y–D (ZigZag–Wye–Delta) or DE–Y–D (Extended delta–Wye–Delta) connection. To prove the feasibility and applicability of both proposed prototypes, computational simulations, under certain established operating conditions, are carried out in Matlab/Simulink to verify the theoretical studies carried out with the help of the MathCad program. Finally, a reduced-scale prototype implementation is performed and tested according to available laboratory resources to validate the proposed converter systems. According to the developed analyses, the results obtained showed a theoretical-experimental consistency in terms of power quality improvement and confirmed the feasibility and applicability of SC–24P (24–Pulse System Converter) and SC–48P (48–Pulse System Converter) proposed.