Three-Phase PWM Rectification

Three-phase PWM rectification is a power electronics technology used to convert alternating current (AC) to direct current (DC). By employing pulse width modulation techniques, it controls the switching devices of a three-phase bridge rectifier to regulate the output DC voltage. This technology is widely applied in various fields including power systems, industrial control, and electric vehicles. Implementation of PWM control typically involves a microcontroller or DSP generating precise switching signals based on voltage/current feedback. Key algorithms include voltage-oriented control (VOC) or direct power control (DPC) strategies, where sinusoidal PWM or space vector modulation techniques regulate switching states to maintain unity power factor and minimize harmonic distortion. The control system often implements PI regulators for DC voltage stabilization and current tracking, with Clarke/Park transformations used for three-phase coordinate system conversion.