An Enhanced Performance of Stationary Reference Frame Controlled Three-phase Vienna Rectifier under Grid Voltage Disturbances

In this paper, a new control method in the stationary reference frame to improve the performance of the three-phase Vienna rectifier under grid voltage disturbances has been proposed. The conventional control method has three control loops viz., current control loop, capacitors voltage balance loop, and output voltage control loop. Under grid voltage disturbances, the conventional control method provides poor current total harmonic distortion (THD), high capacitor ripple voltages and high output ripple voltage. To improve the performance of the three-phase Vienna rectifier under grid voltage disturbances, a fundamental frequency positive sequence (FFPS) extractor is placed in the output voltage control loop of the converter. The Multiple delayed signal cancellation (MDSC) filters are used as an FFPS extractor to extract the FFPS component of the reference three-phase grid currents. The design of the output voltage controller with MDSC filters with a symmetrical optimum method is provided. The effectiveness of the proposed control method is verified using real-time simulations with case studies.