PROJECT ON-

COMPARISON OF DIFFERENT

MULTILEVEL INVERTER

SUBMITTED BY -

SUBHASH KUMAR

VIKAS SINGH RAGHUVANSHI

YATHARTH SAGAR

YOGENDRA KUMAR

IN SUPERVISION WITH –

G.K NAVEEN KUMAR

AJAY KUMAR GARG ENGINEERING COLLEGE

Inverter-An inverter is an electrical circuit capable of turning DC power into AC power, while at the same time regulating the voltage,current, and frequency of the signal.

Classification of Inverter Depending upon the type of source-

-VSI

-CSI

Based upon configuration -

-Series Inverter

-Parallel Inverter

-Bridge Inverter

Based upon output voltage waveform

-Square wave Inverter

-Quasi sequence wave

-PWM Inverter

-Sine Wave Inverter

Based upon switching device

- Thyristor Inverter

- Transistor Inverter

- IGBT Inverter

- IGO Inverter

- MOSFET Inverter

Methods of Inversion Rotary inverters use a DC to turn motor an AC Power

generator, To provide a true sine wave output, but are inefficient, and have a low surge capacity rating.

Electrical inverters use a combination of ‘chopping’ circuits and transformers to change DC power into AC. They are much more widely used and are far more efficient and practical. Less expensive electrical inverters produce a modified sine wave, while more expensive models give a true sine wave.

Single-phase half-bridge inverter

ThesinglephasehalfbridgeconsistsoftwoSCRsandtwo diodes and three wire supply.

For 0 < t ≤ T/2, thyristorT1 conductsandloadissubjectedtoavoltageVs/2duetoupper voltage sourceVs/2.

Att=T/2,thyristorT1commutedandT2isgatedon. Duringthe periodT/2<t≤T,thyristorT2conductsand loadissubjectedtoavoltage(-Vs/2)duetolowervoltagesourceVs/2.LoadvoltageisanalternatingvoltageofamplitudeofVs/2and offrequency1/THz.

Thefrequencyoftheinverteroutputvoltagecanbechangedby controllingT.

Themaindrawbackofhalf-bridgeinverteristhatitrequires3- wire DCsupply.

Operation

Wave form