Multifunctional voltage source inverter for renewable energy integration and power quality conditioning

Area of Science:

• Electrical Engineering
• Power Electronics
• Renewable Energy Systems

Background:

• Grid-connected voltage source inverters (VSIs) are crucial for renewable energy integration.
• Multifunctional VSIs can enhance power quality conditioning in low-voltage distribution systems.
• Existing VSI configurations require optimization for simultaneous energy injection and power quality improvement.

Purpose of the Study:

• To compare the operational voltages of inductive-coupling and capacitive-coupling VSIs for dual functionality.
• To investigate the suitability of capacitive-coupling VSIs for compensating inductive loads in distribution systems.
• To propose a design and control strategy for a multifunctional capacitive-coupling VSI.

Main Methods:

• Comparative analysis of inductive-coupling and capacitive-coupling VSI operation voltages.
• Focus on capacitive-coupling VSI for its lower voltage operation with inductive loads.
• Development of a design and control method for the multifunctional capacitive-coupling VSI.

Main Results:

• Capacitive-coupling VSI exhibits significantly lower operation voltage than inductive-coupling VSI when compensating inductive loads.
• The proposed design and control method for the multifunctional capacitive-coupling VSI are validated.
• Simulation and experimental results confirm the effectiveness of the capacitive-coupling VSI.

Conclusions:

• The capacitive-coupling VSI is an effective solution for simultaneous renewable energy integration and power quality conditioning, especially in systems with inductive loads.
• Lower operational voltage of the capacitive-coupling VSI offers economic and performance advantages.
• The developed design and control methods provide a practical approach for implementing multifunctional VSIs.