This project presents a three-level diode-clamped inverter feeding an asynchronous motor drive with direct torque control (DTC). The control method is based on DTC operating principles. The stator voltage vector reference is computed from the stator flux and torque errors imposed by the flux and torque controllers. This voltage reference is then generated using a diode-clamped inverter, where e...

Photovoltaic energy conversion becomes main focus of many researches due to its promising potential as source for future electricity and has many advantages than the other alternative energy sources like wind, solar, ocean, biomass, geothermal etc. In Photovoltaic power generation system multi level inverters can be used as an alternative configuration for the dc to ac inverter. Diode clamped i...

A compact dc/ac inverter for automotive is presented and experimented. The proposed inverter consists of fall bridge inverter and a new ZVCS quasi-resonant push pull dc/dc converter. The new dc/dc converter converts input 12 V (from battery) to high voltage (about) 200V at very high conversion efficiency without regulation. The high voltage will be converted to ac at the desired voltage and fre...

This paper presents a review and analysis of multilevel inverter topologies. Multilevel inverters are most widely used for medium-voltage high-power converter like fans, pumps and material transport drives. In this active area, different inverter topologies, circuits, advantages and drawbacks are discussed. Multilevel Inverter topologies such as diode-clamped, flyingcapacitor, cascaded H-bridge...

This paper presents multicarrier PWM strategies for three phase cascaded seven level Z-source inverter. Multilevel inverters posses the advantage of reduced harmonics, high-power capability and high-voltage level. Impedance network in the cascaded multilevel inverter circuit will perform boost operation. This paper focuses on multicarrier sinusoidal pulse width modulation (MCSPWM) strategy for ...

phase stand-alone inverter is caused by unbalanced load and a dead time distorts inverter output voltage more unsymmetrically. When the inverter supplies unbalanced load, three phase output voltages include unbalanced odd harmonics but dq-axis voltages at synchronous reference frame have even harmonics with different magnitude each other. In this paper, a new compensation method is proposed to ...

This paper presents a three level NPC LCswitched voltage source inverter. Conventional multilevel voltage source inverter behaves like voltage step down converter. Recently multilevel buck-boost Z-source inverter (ZSI) has been developed for better efficiency and power quality in renewable energy system. The impedance network of the Z-source inverter requires equal inductors and equal capacitor...

This paper presents a new approach for PLL for synchronization with the public grid phase and frequency of grid-connected single phase inverter. The approach uses trigonometric transformations of the inverter output voltage and the grid voltage. The proposed mathematical model is then studied by means of computer simulation for different voltage amplitudes of the grid voltage as well as the inv...

The voltage and current THD values of the symmetric inverter operated by fundamental switching frequency are closer to the IEEE 519 standard. Some additional filter circuit is required to minimize the THD values within the specified limits. However symmetric multilevel inverter requires more number of components and driver circuits. Asymmetric multilevel inverter is proposed in this chapter to ...

Rotor Fed Induction generators are an exception to DFIGs. Small scale wind farms are easy to build in remote, windy areas where standalone systems seem ideal choice for electrical power generation. For these systems, rotor excitation is a critical part. The paper does a comparative analysis of inverter schemes i.e. PWM inverter or pure sine wave inverter, the associated harmonic generation and ...