Development and Power Quality Investigations of Various Direct Power Control Techniques for Three-phase Active Front-end Rectifier

Abstract

Direct Power Control (DPC) is a good alternative to conventional Voltage Oriented Control (VOC) for three-phase active rectifiers. It has several features such as it does not require PI (current) controllers, direct control of active and reactive powers, faster dynamics and decoupled control. In this thesis work, DPC techniques have been extensively studied, investigated, modified and proposed to achieve better power quality performance in terms of reduction in power ripples and THD content. The primary objective of this work is to introduce new DPC techniques to enhance the power quality performance without influencing its features. In this work Algorithm based DPC (A-DPC), Nearest Vector Selection based DPC (NVS-DPC), Virtual flux Deadbeat Predictive DPC (DB-DPC) and Zero Direct Power Control (ZDPC) with Fractional order PI (DC-bus voltage) controller optimized by Teaching learning-based Optimization (TLBO) technique is introduced and enhanced power quality performance is obtained. All the techniques performance is well tested and verified in simulation as well as in experiments. The proposed techniques are following the IEEE standards 519-1992 of power quality.