Modeling of Single-phase to Three-phase Drive System Using Two Parallel Converters on Input Side

The objective is to supply a three phase motors from a single phase AC mains. It is common to have only a single phase power grid in residential, commercial, manufacturing and mainly in rural areas, while adjustable speed drives may require a three phase power grid. Hence we need to convert from single phase to three phase supply to operate the drive system. Parallel converters can be used to improve the power capability, reliability, efficiency and redundancy. Parallel converter techniques can be employed to improve the performance of active power filters, uninterruptable power supplies, fault tolerance of doubly fed induction generators and three phase drives. When an isolation transformer is not used, the reduction of circulating currents among different converter stages is an important objective in the system design. This work proposes a single phase to three phase drive system composed of two parallel single phase rectifiers, an induction motor and three phase inverter. The proposed system permits to reduce the rectifier switch currents, the total harmonic distortion (THD) of the grid current with same switching frequency and to increase the fault tolerance characteristics. Even with the increase in the number switches, the total energy loss of the proposed system is lower than that of conventional system. The model of the system will be derived. A suitable control strategy and pulse width modulation technique (PWM) will be developed. The complete comparison between the proposed and standard configurations will be carried out in this work. Simulation of this project will be carried out by using MATLAB/ Simulink.