SEMINAR ON IEEE PAPER MULTILEVEL CONVERTERS ---A NEW

BREED OF POWER CONVERTERS Jih-Sheng Lai, Senior Member, IEEE, and Fang Zheng

Peng, Member,

BY

A.V.RAVI TEJA 08EE6101

CONVERTERS (D.C. TO A.C. OR A.C. TO D.C.)

TWO TYPES:-

1.VOLTAGE SOURCE (VOLTAGE CONTROLLED)

2. CURRENT SOURCE(CURRENT CONTROLLED)

INVERTER OPERATION

CONVERTER OPERATION

TRANSFORMER MULTIPULSE VOLTAGE SOURCE 12 PULSE CONVERTER

TRANSFORMER COUPLED MULTIPULSE CONVERTERADVANTAGES DISADVANTAGESEASILY OBTAINABLE

NEAR SINUSOIDAL WAVEFORM

48 PULSE WAVEFORM ALSO OBTAINABLE

BULKYCOSTLYNOT PORTABLE

NEW BREED OF POWER CONVERTERS

DIODE-CLAMP MULTILEVEL CONVERTER

MULTILEVEL CONVERTER USING FLYING CAPACITORS

MULTILEVEL CONVERTER USING CASCADED-INVERTERS WITH SEPARATE D.C. SOURCES

DIODE-CLAMP MULTILEVEL CONVERTER

DIODE-CLAMP MULTIPULSE CONVERTERADVANTAGES DISADVANTAGESHIGH EFFICIENCYREACTIVE POWER FLOW

CAN BE CONTROLLEDCOMPACT AND PORTABLE

FOR MORE PULSES, MORE CLAMPING DIODES ARE REQUIRED

COSTLYUNEQUAL DEVICE

RATINGHIGH VOLTAGE

RATING FOR BLOCKING DIODES

MULTILEVEL CONVERTER USING FLYING CAPACITORS

MULTIPULSE CONVERTER USING FLYING CAPACITORSADVANTAGES DISADVANTAGESHIGH EFFICIENCYREAL AND REACTIVE

POWER FLOW CAN BE CONTROLLED

COMPACT AND PORTABLE

FOR MORE PULSES, MORE CAPACITORS ARE REQUIRED

COSTLY

MULTILEVEL CONVERTER USING CASCADED-INVERTERS WITH SEPARATE D.C. SOURCES

MULTIPULSE CONVERTER USING CASCADED-INVERTERS WITH SEPARATE D.C. SOURCESADVANTAGES DISADVANTAGESREQUIRES LEAST NUMBER

OF COMPONENTS TO ACHIEVE SAME VOLTAGE LEVELS

HIGH EFFICIENCYNO CLAMPING DIODES OR

VOLTAGE BALANCING CAPACITORS REQUIRED

COMPACT AND PORTABLESWITCHING LOSSES ARE

VERY LESS

NEEDS SEPARATE D.C. SOURCES FOR REAL POWER CONVERSIONS

APPLICATIONS 1

APPLICATIONS 2

CONCLUSIONS 1MULTI LEVEL INVERTERS HAVE THE MOST

IMPACT IN ADJUSTABLE SPEED DRIVEFOR STANDALONE SYSTEMS MAGNETIC

TRANSFORMER COUPLED CONVERTERS ARE THE BEST FOR HIGH EFFICIENCY.

FOR BEST PORTABILITY, MULTI LEVEL CONVERTER USING CASCADED INVERTERS WITH SEPARATE D.C. SOURCES IS THE BEST

CONCLUSIONS 2FOR CONTROLLING REAL AND REACTIVE

POWER, MULTILEVEL CONVERTERS USING FLYING CAPACITORS IS THE BEST

DIODE CLAMP MULTILEVEL CONVERTERS ARE THE BEST OPTION FOR BACK TO BACK INTERTIE SYSTEMS