Review of Pulse Modulation Controllers for reduced swiches Multil-level converters

This work is about the review of various pulse width modulation (PWM) controller techniques and newer Multi Level inverter topologies. As the renewable sources generates power at lower voltage level and in the form of DC, always a need of conversion devices like DC and AC converters. The high-power electronic converters are those can convert the available energy to form of energy required by the grid or load. These converters usually operate at very higher frequencies as like electronic circuits, but the difference is operating power. Generally electronic circuits will operate at lower power levels, but the converters used in the power conversion have to operate at higher power level. So, the controlling mechanism for these converters play a key role in the performance of a converter, in this paper some of the PWM methods has been stated with their characteristics and also a hybrid MLI with the new topologies has been compared.