Simulation and Analysis of Control Algorithms for an Open End Winding Induction Motor
Induction motors are one of the commonly used machines in many industrial applications. But the induction motors results in high starting current, formation of common mode voltages, difficult to control etc. This work proposes a solution for photovoltaic water pumping using a dual inverter fed induction motor with open end stator windings. The three level dual inverter received large attention because of its simplicity and it reduces the voltage rating of the semiconductor devices which further reduces cost of the system. This system is operated using an integrated control which include maximum power point tracking and space vector pulse width modulation technique. A boosting converter with a high voltage gain is also used which requires no chemical storage elements such as batteries and make the system more effective. For tracking the maximum power Perturb and observe method is used. Space vector modulation is designed such that it eliminates the common mode voltages generated. The modeling of dual inverter fed open end winding induction motor, PV system, MPPT algorithm and switching of inverters using space vector modulation has been done and the output waveforms obtained are analyzed.
Keywords - Common mode voltage, Open end winding induction motor, Space vector modulation.