Single-Phase PWM Rectifier with Grid Voltage Feedback Implementation

The single-phase PWM rectifier with grid voltage feedback represents an advanced power conversion solution particularly suitable for low-power applications. This topology employs voltage-oriented control (VOC) strategy where grid synchronization is achieved through phase-locked loop (PLL) algorithms, typically implemented using dq-frame transformation in microcontroller code. The high-quality output waveform results from precise PWM modulation techniques, often coded with space vector modulation (SVM) or sinusoidal PWM (SPWM) algorithms that maintain unity power factor operation. With embedded voltage regulation capabilities through proportional-integral (PI) controllers in the feedback loop, this rectifier finds applications in motor drive systems, battery charging circuits, and renewable energy interfaces. The control logic typically involves ADC sampling for voltage/current sensing, Clarke/Park transformations for decoupled control, and PWM generation registers for switching signals. The circuit design simplicity allows straightforward implementation using standard components like IGBTs/MOSFETs drivers, while the digital control aspect requires coding fundamental functions: 1. Grid synchronization algorithm using software PLL 2. DC-link voltage PI controller with anti-windup protection 3. Current regulation in synchronous reference frame 4. PWM duty cycle calculation and dead-time compensation This rectifier architecture provides a versatile platform for experimenting with closed-loop control strategies, making it particularly valuable for understanding real-time implementation of power electronics systems through practical coding exercises.