Continuous-time robust frequency regulation in isolated microgrids with decentralized fixed structure μ-synthesis and...

Area of Science:

• Electrical Engineering
• Control Systems
• Renewable Energy Systems

Background:

• Isolated microgrids are vital for remote power supply, increasingly integrating renewable energy sources.
• Renewable integration introduces frequency deviations, threatening microgrid stability.
• Conventional centralized controllers face limitations in managing these dynamic challenges.

Purpose of the Study:

• To develop decentralized fixed-structure robust μ-synthesis controllers for microgrid frequency regulation.
• To overcome the limitations of traditional centralized control methods.
• To enhance the reliability and stability of microgrids with significant renewable penetration.

Main Methods:

• Design of decentralized controllers using the D-K iteration technique for continuous-time systems.
• Incorporation of performance weight filters to manage control sensitivity and frequency band operation.
• Modeling and analysis of unstructured uncertainty up to 40% using normalized co-prime factorization.

Main Results:

• Proposed decentralized controllers demonstrate superior disturbance rejection and robustness against uncertainties.
• Robust stability verified for uncertainties up to 171% of the modeled level.
• Fixed-structure, lower-order controllers offer practical implementation advantages over other H-infinity methods.

Conclusions:

• The developed decentralized controllers significantly enhance microgrid frequency regulation and system stability.
• The controllers outperform existing methods like CHIO-PID and CHIO-FOPID in dynamic performance.
• This research provides a robust solution for reliable microgrid operation amidst evolving energy landscapes.