MATLAB Implementation of PFC Voltage Model

In power electronics and energy conversion systems, Power Factor Correction (PFC) technology is crucial for effectively improving grid power factor and reducing harmonic pollution. MATLAB serves as a powerful simulation tool widely applied in the implementation and analysis of PFC voltage models. The core objective of the PFC voltage model is to control the input current waveform to align with the input voltage waveform phase, thereby enhancing power factor. In MATLAB implementation, the Simulink environment is typically employed to build simulation models. The implementation approach primarily includes the following steps with corresponding MATLAB/Simulink techniques: Circuit Modeling: First, establish a Boost converter topology containing rectifier bridges, inductors, and switching devices using Simulink's Electrical Components library. This structure represents the common choice for PFC circuits, where components can be configured through parameter blocks. Control Strategy: Implement either average current control or dual-loop control (voltage outer loop + current inner loop) using Control System Toolbox functions. The current controller ensures input current tracks the voltage waveform through transfer function blocks and PID controllers. Modulation Technique: Typically employ PWM (Pulse Width Modulation) using Simulink's PWM Generator block to control switching devices, maintaining stable DC output voltage through carrier comparison and duty cycle calculation. Simulation Analysis: Utilize MATLAB/Simulink's scope visualization and FFT analysis tools (through Powergui block or Signal Processing Toolbox) to observe input current waveforms, THD (Total Harmonic Distortion), and output voltage stability. The fft function can be applied for harmonic analysis with proper windowing techniques. Through MATLAB simulation, parameters such as inductance values and switching frequency can be flexibly adjusted using variable blocks to optimize PFC performance, providing theoretical basis for actual hardware design. This model not only suits academic research but also serves as an effective tool for engineers developing high-efficiency PFC circuits.