Electrified vehicles on the market today all use the classical two-level inverter as the propulsion inverter. This thesis analyse the potential of using a cascaded H-bridge multilevel inverter as the propulsion inverter. With a multilevel inverter, the battery is divided into several parts and the inverter can now create voltages in smaller voltage levels than the two-level inverter. This, amon...

This paper presents a new topology for a multilevel inverter, which consists of a single dc voltage source with a series of capacitors, power switches and a mid-point transformer to demonstrate the operation of a five level inverter. A SPARTAN 3E field programmable gate array based controller is used for the generation of the switching scheme. The comparative study of the proposed inverter with...

 Traditional 2-level high-frequency pulse width modulation (PWM) inverters for motor drives have several problems associated with their high frequency switching which produces common-mode voltage and high voltage change (dV/dt) rates to the motor windings. Multilevel inverters solve these problems because their devices can switch at a much lower frequency. Two different multilevel topologies a...

Voltage Sag is one of the Power Quality problem and it become severe to industrial customers. Voltage sag causes miss operation to several sensitive equipments. This problem can be mitigating with the Dynamic Voltage Restorer. DVR is a solid state device which is connected in series between the source and load voltages. In this Dynamic Voltage Restorer is implemented using Capacitor Clamped Mul...

A six-level inverter system for an open-end winding induction motor drive is presented in this paper. Multilevel inversion is achieved by feeding an open-end winding induction motor with a 3-level inverter from one end and a 2-level inverter from the other end of the motor. The 3level inverter used in the proposed drive, is realized by cascading two 2-level inverters. The combined inverter syst...

Multilevel inverters are increasingly being used in high-power medium voltage applications due to their superior performance compared to two-level inverters. Among various modulation techniques for a multilevel inverter, the space vector pulse width modulation (SVPWM) is widely used. The complexity is due to the difficulty in determining the location of the reference vector, the calculation of ...

MultiLevel Inverter (MLI) is used in applications that need high voltage and high current especially for Flexible AC Transmission System (FACTS) controllers. The topologies of multilevel inverter have several advantages such as lower Total Harmonic Distortion (THD), lower ElectroMagnetic Interference (EMI) generation and high output voltage. The main feature of Modular Structured Multilevel Inv...

The multilevel inverters are very popular in high power high voltage applications. However the multilevel inverters has some demerits such as requiring higher number of components, PWM control method is complex and capacitor voltage balancing problem. The hybrid multilevel inverter presented in this paper has superior characteristics over conventional multilevel inverters. The hybrid multilevel...

In recent years, voltage source multilevel inverters are being applied extensively in industry as they have many advantages compared to conventional two level inverters. Some of these advantages such as higher output voltage at low switching frequency, low voltage stress (dv/dt), lower Total Harmonic Distortion (THD), less Electro-Magnetic Interference (EMI), smaller output filter and higher fu...