Design High-Gain Boost PFC Converter

Design and simulate a Single-phase High-Gain Boost Power Factor Correction (PFC) converter with closed-loop control using MATLAB/Simulink. The converter is designed to convert a single-phase AC supply into a regulated DC output while maintaining a high power factor, low input current harmonics, and high conversion efficiency. The closed-loop control strategy should ensure accurate output-voltage regulation and proper input-current shaping under varying operating conditions.

||> Design Specifications
-> Input Voltage - 230 V RMS, 50 Hz
-> Output Voltage - 400 V DC
-> Output Power - 2 kW
-> Converter Topology - Boost Converter
-> Switching Frequency - 100 kHz
-> Control Method - Closed-Loop Voltage and Current Control
-> Simulation Platform - MATLAB/Simulink

||> Objectives
-> Design a single-phase High-Gain Boost PFC converter capable of producing a regulated 400 V DC output.
-> Implement a closed-loop control scheme to maintain output-voltage regulation under varying load conditions.
-> Shape the input current to follow the input voltage waveform and achieve near-unity power factor.
-> Minimize Total Harmonic Distortion (THD) of the input current.
-> Analyze the converter performance under steady-state and transient operating conditions.
-> Evaluate efficiency, voltage regulation, and power-quality performance.

||> Scope of Work
-> Mathematical modeling of the High-Gain Boost PFC converter.
-> Design and sizing of passive and active components.
-> Development of a dual-loop control system for voltage regulation and current shaping.
-> Generation of PWM gating signals for converter operation.
-> MATLAB/Simulink implementation and simulation.
-> Analysis of startup response, load variations, and output-voltage regulation.
-> Performance evaluation in terms of power factor, THD, efficiency, and ripple.

||> Closed-Loop Control Strategy
== Outer Voltage Loop
-> Continuously monitors the output DC voltage.
-> Compares the measured output voltage with the reference value of 400 V.
-> A PI controller processes the voltage error and generates the reference current magnitude.

== Inner Current Loop
-> Shapes the input current to follow the rectified input-voltage waveform.
-> Ensures sinusoidal input current and near-unity power factor.
-> A PI controller regulates the inductor current and generates the duty-cycle command.

||> PWM Generation
-> The controller output is compared with a high-frequency carrier signal.
-> PWM pulses are generated at 100 kHz to drive the converter switch.

||> Expected Results
-> Regulated 400 V DC output voltage.
-> Stable closed-loop operation.
-> Near-sinusoidal input current waveform.
-> Power factor close to unity (≈0.99 or higher).
-> Low input current THD.
-> Fast dynamic response to load disturbances.
-> High conversion efficiency.

||> Software Tool
MATLAB/Simulink will be used for:
-> Converter modeling
-> Closed-loop controller design
-> PWM generation
-> Power-factor analysis
-> THD analysis
-> Dynamic-performance evaluation

||> Performance Parameters to be Evaluated
-> Output voltage regulation
-> Power factor
-> Input current THD
-> Converter efficiency
-> Inductor current ripple
-> Output voltage ripple
-> Startup performance
-> Dynamic response to load changes