Improved ac/ac choppers‐based voltage regulator designs

This paper proposes a robust design for the ac/ac chopper‐based voltage sag/swell compensation systems. This includes the design of a new buck–boost topology and the application of a robust switching scheme for a voltage compensator. The proposed circuit can operate in the buck or boost mode for both the sag and the swell compensations. A control scheme for a fast compensation is also proposed which is suitable for the ac/ac chopper‐based compensation system. Detailed analysis and verification through a simulation in the MATLAB are presented highlighting the advantages of the proposed technique. An experimental verification has also been performed by using a laboratory prototype system.