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.

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