Online analysis of MFC-fuzzy PI based LF-HVAC system

Abstract

The study introduces a unique control strategy combining multi-frequency control (MFC) and fuzzy PI control for LF-HVAC transmission systems. MFC is typically associated with microgrid applications, but here it’s adapted for use in a different context – LF-HVAC transmission (low frequency high voltage alternating current). The proposed controller is shown to enhance system performance by reducing settling time and peak time of frequency fluctuations by small but significant percentages (0.12% and 0.15% respectively). These improvements contribute to better transient response and stability in LF-HVAC transmission systems. By minimizing power quality problems associated with frequency changes, such as total harmonic distortion (THD) of line voltage, the proposed controller enhances the overall quality and reliability of power transmission. This is particularly crucial in high-voltage transmission systems where maintaining stable voltage levels is essential. The study goes beyond theoretical simulations by validating the proposed model using both MATLAB simulations and real-time hardware-in-the-loop (HIL) simulations with Opal RT. This comprehensive validation process ensures the reliability and applicability of the proposed control strategy in practical LF-HVAC transmission systems.

Keywords

• Fuzzy
• LFAC
• HVAC
• back-to-back converters
• frequency
• OPAL-RT