Parallel Connection of Convertors for HVDC Transmission

Juhlin, L.-E.; Liss, Gote; Ekström, Å.

doi:10.1109/tpas.1978.354542

Cited by 7 publications

(1 citation statement)

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“…The disadvantage of the 1PBTBS (one 12-pulse DC circuit) is that if one 6-pulse bridge of 12-pulse DC circuit falls, then the entire system becomes completely lost. The parallel interconnection of two or more 1PBTBSs is used to increase the reliability and capacity of electrical energy exchanging between two AC systems [11], [12]. For example, the Vyborgskaya BTBS project consists of four 1PBTBS units, with each unit rated at 355 MW.…”

Section: Installed Throughoutmentioning

confidence: 99%

Upgrading of the Existing Bi-Pole to the New Four-Pole Back-to-Back HVDC Converter for Greater Reliability and Power Quality

2019

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Back-to-back high-voltage direct current systems are used to transfer electrical power between two asynchronous AC systems. The existing bi-pole back-to-back system (2PBTBS) can be converted into the four-pole back-to-back system (4PBTBS) to save in the required infrastructure for proposed installations. This upgrading provides four parallel 12-pulse DC circuits instead of only two 12-pulse DC circuits as in the existing 2PBTBS. The power transfer capability of each DC circuit in the proposed system is 25% of the original system capacity instead of 50% as in the existing 2PBTBS. The reliability of the proposed 4PBTBS is improved twice, and the line-to-line DC voltage levels are reduced to 50% in comparison with the existing 2PBTBS. In this study, the 4PBTBS and existing 2PBTBS are simulated using MATLAB/Simulink. Simulation result shows that the proposed 4PBTBS has four parallel 12-pules DC circuits at lower line-toline DC voltage and higher power quality compared with the existing 2PBTBS. These results validate the performance of the proposed system obtained from upgrading the existing 2PBTBS.INDEX TERMS LCC-HVDC transmission, back-to-back HVDC system, reliability, 6-pulse HVDC converter, 12-pulse HVDC converter.

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Section: Installed Throughoutmentioning

confidence: 99%