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Diagram and brief description of 12 pulse converter is explained in this ppt.
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FABRICATION OF TWELVE PULSE CONVERTER
FABRICATION OF TWELVE PULSE CONVERTER
BACK GROUND
Recently, HVDC is used as an alternative to AC for
transmitting electrical energy over long distances. An
HVDC transmission requires electric power to convert from
high voltage alternating current (AC) to high-voltage direct
current (HVDC), or vice-versa. Most of the HVDC systems in
operation today are based on line-commutated converters
(LCC).
For long-distance transmission, HVDC systems may be less
expensive and suffer lower electrical losses.
WHY HVDC?It’s an interesting question, because most electrical power transmissions also use three-phase alternating current. So how does DC transmission fit into a modern power network?
High-voltage AC transmission has some limitations Starting with transmission capacity and distance
constraints The impossibility of directly connecting two AC power
networks of different frequencies.
High-voltage DC transmission provides Stable transmission Control capability This operation can be performed by TWELVE PULSE
CONVERTER with low harmonics
CIRCUIT DIAGRAM
WAVEFORMS OF 12 PULSE CONVERTER USING THYRISTORS
REFERENCES
Economic Assessment of HVDC Links, CIGRE Brochure Nr.186 (Final Report of WG 14-20)
Power electronics: converters, applications, and design By Ned Mohan, Tore M. Undeland.
THANK YOU