PROJECT TITLE :

Control of Medium Voltage AC Motor Drive for Wide Speed Range Using Modular Multilevel Converter - 2017

ABSTRACT:

For the appliance of variable speed drive, submodule capacitors of the modular multilevel converter (MMC) suffer from giant voltage fluctuations at low frequencies. This paper presents a management technique that regulates this fluctuation to a relentless price in the least speeds with rated load torque. Transformerless configuration of this drive is as follows. An MMC is employed as a front-finish converter and is directly connected to the grid. It keeps the grid current sinusoidal and is in section with the grid voltage. It generates regulated dc current at the output. Another MMC, connected in cascade with the earlier one, drives a three-phase induction motor. Thus, the input to the current rear-end MMC is constant dc current, the output is variable magnitude and frequency voltage supply that drives the motor. This paper proposes a control strategy for this drive. The proposed control methodology and its performance are analyzed and verified through experimental ends up in this paper.