Adaptive PLL-based Sensorless Control for CSI-Fed PMSM Drives Used in Submersible Pumps

This study examines the critical role of precise rotor position estimation in field-oriented control (FOC) of current source inverter (CSI)-fed Permanent Magnet Synchronous Motor (PMSM) drives for submersible pump applications. Despite advancements, challenges such as inverter nonlinearity and parameter variations introduce significant errors in rotor position estimation under dynamic and steady state conditions. This adversely affects the reliability and efficiency of the drive system. The proposed adaptive PLL aims to optimize PMSM acceleration by dynamically adjusting PLL bandwidth, effectively mitigating estimation errors caused by various non-ideal factors in steady state condition. Simulation and experimental results validate the effectiveness of the proposed approach.