Prototype Design of Coal Feeder Pulverizer Motor Speed Control System at Paiton Unit 3 PLTU Using Altivar ATV12H075M Inverter

Abstract

This study presents the design and experimental evaluation of a three-phase induction motor speed control system using the Altivar ATV12H075M inverter for conveyor and coal feeder simulation applications in power generation environments. The proposed system was developed to achieve stable, efficient, and precise motor speed regulation through frequency-based control. Experimental testing was conducted by varying the inverter frequency from 10 Hz to 50 Hz in forward and reverse operating modes while measuring phase voltage, phase current, and motor rotational speed. The results demonstrate a strong and near-linear relationship between inverter frequency and motor speed, with measured speeds increasing from approximately 294–296 RPM at 10 Hz to 1497–1498 RPM at 50 Hz. The inverter maintained proportional voltage–frequency characteristics, with phase voltage rising from about 151.6 Vac to 215.6 Vac, while phase current remained within a safe range of 0.6–1.2 A. The measured motor speeds closely matched theoretical synchronous speeds with deviations below 2%, attributable to normal slip. These findings confirm that the Altivar ATV12H075M inverter provides reliable, stable, and energy-efficient speed control, making the developed system suitable as both an industrial training platform and a scalable reference model for conveyor and coal feeder applications in power generation systems.