A Study on DAS(Dual Algorithm-Based Sensorless) Control for Performance Improvement of Reciprocating Compressor Motor Drive System

In this paper, we presented a sensorless control method for a reciprocating compressor motor based on Single-Shunt current measurement. In order to mitigate the estimation performance degradation caused by current reconstruction errors, a dual algorithm-based sensorless transition method is employed. This method comprises a current model-based method at low speeds and an extended EMF observer at high speeds. Additionally, a resonant and repetitive controller has been integrated to suppress speed ripple caused by periodic load torque. The simulation results demonstrate the efficiency of the proposed approach in reducing both speed ripple and maximum estimation error across the entire speed range. These results is indicated that is a suitable approach for implementation in low-cost sensorless motor drive systems.