DESIGN AND IMPLEMENTATION OF CASCADED MULTILEVEL QZSI POWERED SINGLE PHASE INDUCTION MOTOR FOR ISOLATED GRID WATER PUMP APPLICATION

Abstract

This project proposes the design and implementation of solar powered V/f controlled single phase capacitor start induction motor. Multi-Level Quasi Impedance Source Inverter (MLqZSI) controls the power flowing from PV array to single phase induction motor. In solar powered drive systems, main concern is stable intended operation of drive when subjected to variations in power generation of PV array. For same environmental conditions, PV power extraction is different at different torques for constant speed application. Due to this, extraction of maximum power with MPPT algorithm is not achieved with only motor load. To address this concern, concept of battery storage system is introduced in the system which helps in achieving maximum power when PV power generation capability exceeds rated motor input power. In addition to this, battery storage system can supply power to the load when PV power generation is less than the rated motor input power. Conclusively, design of control algorithm must address issues of MPPT algorithm, control of battery storage system and stable operation of V/f controlled induction motor drive operation. MATLAB/ Simulink model of the proposed system with 4kW PV array rating is developed. Proposed Control Algorithm achieves satisfactory operation of single phase motor drive in all the three operation modes (depending upon PV power generation). Variation of solar irradiation and temperature are simultaneously considered for introducing perturbation in the PV power generation. Hardware results for this system are also presented which validates the effectiveness of the control algorithm for the proposed system.

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