A Distributed Control Scheme Using SiC-Based Low Voltage Ride-Through Compensator for Wind Turbine Generators.

Area of Science:

• Electrical Engineering
• Power Systems Engineering
• Renewable Energy Integration

Background:

• Increasing renewable energy penetration necessitates robust grid fault management.
• Low Voltage Ride-Through (LVRT) is critical for grid stability with wind turbine generators (WTGs).
• Existing centralized LVRT controllers have limitations in dynamic response and efficiency.

Purpose of the Study:

• To propose a novel distributed control scheme for LVRT in WTGs.
• To enhance system efficiency and reliability using silicon carbide (SiC)-based inverters.
• To enable simultaneous reactive current compensation for Doubly-Fed Induction Generator (DFIG) and Permanent Magnet Synchronous Generator (PMSG) based WTGs.

Main Methods:

• Development of a distributed LVRT compensator (LVRTC).
• Implementation of a digital control scheme with dq-axis current decoupling.
• Theoretical analysis, mathematical modeling, and computer simulations.
• Experimental validation using a 2 kVA hardware system with a digital signal processor (DSP).

Main Results:

• The proposed LVRTC effectively performs simultaneous active and reactive power control.
• SiC-based inverters contribute to improved system efficiency and reliability.
• Simulation and experimental results demonstrate close agreement, validating the control scheme's feasibility.
• The distributed approach ensures effective reactive current compensation during grid faults.

Conclusions:

• The proposed distributed LVRT control scheme is feasible and effective for WTGs.
• The LVRTC enhances grid stability and power quality during fault conditions.
• The use of SiC inverters and advanced digital control offers significant advantages in efficiency and reliability.