Control Strategies for Three Phase PWM Rectifier using Space Vector Modulation: Part-I

This paper explains the control strategies for three phase PWM rectifier using space vector modulation (SVM).The virtual flux based Direct Power Control (VF-DPC) which eliminates the line voltage measurements, active filtering function along with direct power control and conventional Voltage Oriented Control (VOC) in rotating coordinates with a novel line voltage estimator are studied, modeled and simulated. The steady state performances of these strategies are observed by measuring Total Harmonic Distortion (THD). From the simulations it is found that virtual flux based direct power control and active filtering function methods exhibits several features such as a simple algorithm, good dynamic response, and constant switching frequency. The details of mathematical modeling and simulations of all the three methods are presented in this thesis. This paper is organized as three parts.