50 years HVDC ABB – from pioneer to world leader

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In 1954, at a time when much of Europe was busy expanding its electricity supply infrastructure
to keep pace with surging demand, an event was quietly taking place on the shores of the Baltic
6 I) r: B5 ?/ _8 rSea that would have a lasting effect on long-distance power transmission. Four years earlier, the
( n- M) E4 Q0 s! k- F' GSwedish State Power Board had placed an order for the world’s first commercial high-voltage
4 S9 e+ E; d& J9 [direct current (HVDC) transmission link, to be built between the Swedish mainland and the island
' z& D9 P" O& D1 d& G) T* Zof Gotland. Now, in 1954, it was being commissioned.-%-97570-%--%-11576-%--%-11570-%-

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Mercury-arc valve based HVDC had come a long way in a short time, but it was a
- n# G$ D3 f2 o0 ptechnology that still harbored some weaknesses. One was the difficulty in predicting the
# K, ~& `" q( Obehavior of the valves themselves. As they could not always absorb the reverse voltage,
1 U0 K/ G" e4 |  B* g+ Harc-backs occurred. Also, mercury-arc valves require regular maintenance, during which
$ z) @* m; @: ?absolute cleanliness is critical. A valve that avoided these drawbacks was needed.

jessie_hyj

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laocheng88877

Fundamentals of Power Electronics 传到共享邮箱了
! ^0 y" F8 o' P. b  p% [
power system stability and control----canada, kundar

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baoshunxian

ABB公司的确是电力行业的龙头，先锋，有太多的方面值得我们去学习了！