Simulation of Soft Start for AC Motors

When performing AC motor soft start simulation, various factors must be considered, such as the triggering angle of silicon-controlled rectifiers (SCRs) and variations in DC-side voltage. The simulation implementation typically involves using PWM control algorithms to manage the triggering pulses for thyristors, with the firing angle being programmed to gradually increase from a high initial value to allow smooth current buildup. From the coding perspective, this requires implementing phase-angle control functions that calculate the appropriate timing for SCR triggering based on voltage measurements and load characteristics. Additionally, to better understand the motor's operational state during the startup process, it's essential to create startup simulation diagrams. These diagrams, which can be generated using plotting functions in simulation software like MATLAB/Simulink, help visualize motor performance parameters such as torque characteristics, current waveforms, and speed curves. The simulation output typically includes graphs showing the gradual ramp-up of voltage and current, demonstrating how soft start reduces mechanical stress and electrical disturbances. Therefore, when conducting AC motor soft start simulations, comprehensive consideration of all factors combined with detailed simulation diagrams enables more precise debugging and optimization of the startup characteristics.