FLC-Based Analysis of LCC and MMC Hybrid HVDC Transmission System

Ezhil Hannah J

Abstract


To meet the high demand of electrical energy, reliable and stable transmission facilities are required. Due to several disadvantages in AC transmission lines such as thermal limits, corona effect, skin effect, etc. HVDC came into existence. HVDC has proved to be more durable and reliable in case of long distance and under water transmission. A new hybrid HVDC system, which combines the best features of line-commutated converter and VSC technology, is proposed. The proposed system constitute the robust performance and low capital cost and power loss of a line commutated HVDC converter, with the fast dynamic performance of a MMC system. It also describes the principles and control strategies of the proposed system. The most challenging issue in the operation of MMC is sub-module voltage balancing. The phase shifted multi carrier PWM technique is introduced in this proposed system to rectify the voltage balancing problem. The FLC controller is employed to provide the better stability of dc voltage. The voltage distortion of MMC was reduced and gives low THD. Finally, the MATLAB/SIMULINK simulation verifications have been carried out based on a 250-MW/ 110-kV LCC–MMC hybrid HVDC system and its dc network.

Keywords: HVDC, hybrid transmission, MMC, LCC, phase shifted multi carrier PWM technique, sub-module voltage balancing

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References


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DOI: https://doi.org/10.37628/ijacs.v1i1.241

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