使用合成试验回路对三峡—常州HVDC晶闸管阀进行运行试验

OPERATIONAL TESTS OF THE THREE GORGES-CHANGZHOUHVDC THYRISTOR VALVES BY USING A SYNTHETIC TEST CIRCUIT

三峡―常州(3G)HVDC晶闸管阀使用的是高额定容量的晶闸管,若用传统的背靠背回路进行试验,需要巨大的投资。为此,开发了一合成试验回路,并成功用于试验三峡晶闸管阀。该回路使用常规的背靠背试验回路作电流源,用振荡回路作电压源,能够充分再现HVDC晶闸管阀的4种运行状态。所产生的试验电应力大于或等于运行条件下的预计电应力。型式试验结果表明,三峡HVDC晶闸管阀完全满足要求。由于试验参数普遍高于设计要求,表明晶闸管阀的设计裕度较大。

Three Gorges-Changzhou(3G) HVDC thyristor valves have a high power r at ing per thyristor level. Testing of these thyristor valves by using a convention al Back-to-Back test circuit would necessitate huge investments and would not gi ve an improved testing regime than produced by the solution chosen. A synthetic test circuit using the conventional Back-to-Back test circuit to supply the curr ent and an oscillating circuit to supply the voltage has been developed for the testing of the 3G thyristor valves. The conditions of the four operational state s of HVDC thyristor valves can be adequately represented in this synthetic test circuit. The test parameters used gave test stresses on the test object equal to or higher than those that are foreseen to appear in service. The successful typ e test results showed that the design of 3G HVDC thyristor valves is fully adequ ate. The tested modules have also shown a substantial margin in the thyristor va lve design since, for most of the tests, the test parameters were globally more severe than specified.