MATLAB Code Implementation for VVVF Simulation Model

In the field of motor control, Variable Voltage Variable Frequency (VVVF) technology serves as one of the core methods for AC speed regulation. The simulation model built using MATLAB can visually validate the effectiveness of constant voltage-to-frequency ratio control strategies.

Basic Implementation Approach System Modeling: Construct three-phase inverter, induction motor, and PWM modulation modules in Simulink. The inverter is implemented using IGBT modules, controlling output voltage and frequency through switching frequency regulation. Constant V/F Algorithm: Based on motor characteristics, design a linear relationship between voltage and frequency (V/f = constant) to ensure constant magnetic flux. Reference voltage and frequency signals are typically generated through lookup tables or real-time calculations. Closed-Loop Control: Incorporate speed feedback loop with PI regulators to dynamically adjust output frequency for stable rotational speed.

Simulation Key Points Set appropriate carrier frequency and modulation ratio to avoid harmonic distortion. Motor parameters (such as rated power, pole pairs) must match the actual model. Use Scope blocks to observe waveforms of rotational speed, torque, and three-phase currents for dynamic response verification.

Application Extensions This model can be further optimized for vector control or direct torque control to meet higher-precision speed regulation requirements. For R2009 version, pay attention to compatibility of certain module libraries and replace with equivalent legacy components when necessary.