Abstract
The modular multilevel converter (MMC) is an operational switch-mode converter topology which represents a potential solution for high-voltage direct current (HVDC) transmission applications. This paper deals with the dynamic performance of an MMC-based, back-to-back HVDC system. Through an Anti-Windup (AW) control method, an energy control strategy for the MMC is proposed. This approach allows to generate the desired optimal reference signals for the differential current loops with respect to its dynamic constraints. A combination between conventional PI/IP and anti-windup controllers is used to extract the advantages of each one. For MMC linked to HVDC systems, the same advanced controller combined to conventional controller of DC voltage will be applied to generate the desired active power reference and to regulate the DC bus voltage. The effectiveness of the proposed anti-windup control strategy for MMC-HVDC system is then evaluated through SPS Matlab/Simulink. Obtained results, of the two-terminal MMC-HVDC system-based anti-windup approach under different dynamic conditions, presents satisfactory dynamic responses.
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