A novel hybrid LFC scheme for multi-area interconnected power systems considering coupling attenuation

Area of Science:

• Electrical Engineering
• Control Systems Theory
• Power Systems Analysis

Background:

• Interconnected power systems face challenges in maintaining stable frequency and tie-line power due to complex dynamics.
• Decoupling control objectives is crucial for effective Load Frequency Control (LFC) in multi-area systems.
• Existing LFC schemes may struggle with network coupling and uncertain dynamics.

Purpose of the Study:

• To propose a hybrid LFC scheme for multi-area interconnected power systems.
• To simplify control objectives by dividing areas into responsible and free zones.
• To develop an integrated LFC controller for free areas that addresses network coupling and disturbances.

Main Methods:

• A hybrid LFC scheme dividing subareas into responsible and free areas.
• Design of a coupling attenuation baseline controller using a multi-player zero-sum differential game.
• Development of a disturbance compensation controller based on a generalized integral observer.
• Rigorous proof of the ultimately uniformly bounded (UUB) stability of the integrated controller.

Main Results:

• The proposed hybrid LFC scheme effectively decouples control objectives.
• The integrated LFC controller for free areas ensures stability under complex network conditions.
• Simulations demonstrate superior performance in challenging operating modes compared to existing methods.
• The L₂-Gain condition and UUB stability are rigorously validated.

Conclusions:

• The hybrid LFC scheme offers a robust and efficient approach to load frequency control in multi-area power systems.
• The integrated controller effectively manages network coupling and disturbances, enhancing system stability.
• This strategy provides a significant advancement for maintaining reliable power supply in interconnected grids.