Sensorless Field Oriented SMCC Based Integral Sliding Mode for Solar PV Based Induction Motor Drive for Water Pumping
Rashmi Rai, Saurabh Shukla, Bhim Singh
Abstract
This article focuses on an efficient and robust speed sensorless control for a solar water pumping system consisting of solar photovoltaic (PV) array fed submersible induction motor drive (SIMD). The speed estimation and sensorless control of SIMD are quite demanding tasks. Additionally, the motor parameter variations lead to deteriorate sensorless control. Therefore, a sensorless control of submersible induction motor (SIM) requires accurate and robust stator current control. The sliding mode based dc link voltage regulator is adopted for regulating the motor power and the speed for single stage solar PV topology. The integral sliding mode observer based speed estimation of SIM and sliding mode current control (SMCC) for decoupling of current provide a robust control against motor parameters variation. The proportional integral controller based speed sensorless control is used, and its performance is verified with a developed sliding mode based control for motor parameter variation. The ISM-based sensorless control with SMCC for submersible motor serves several benefits in water pumping for agricultural purposes in the presence of uncertainities. In addition, it gives fast response during dynamics. The precise estimation of rotor speed is achieved for a wider range of speed under various dynamic conditions. The developed system with a single-stage PV topology and three-phase voltage source inverter fed IMD feeding a pump as a load is designed and implemented in MATLAB/Simulink. The suitability of the system is validated through experimentation in the laboratory.