Analysis of three phase PWM buck rectifier under modulation magnitude and angle control

The analysis of the steady-state, dynamic, and small-signal performance of a three-phase AC/DC buck rectifier using pulse width modulation (PWM) with modulation magnitude and angle control is presented. General equations of the converter including switching discontinuities are derived and used for transient and dynamic simulations. From these nonlinear equations, using the concept of existence function and synchronous reference frame d-q-o transformation, simplified steady-state and small-signal models are derived. Unity power factor operation of the converter is extensively studied. Dominant eigenvalue variation and various transfer functions are determined. The various input-output transfer functions are highly coupled