OPERATIONAL TESTS OF GARABI II HVDC THYRISTOR VALVES

A synthetic test circuit is used to test the Garabi II HVDC thyristor va lves.This synthetic test circuit comprises a conventional Back-to-Back direct test circuit and a voltage oscillating circuit to reproduce the current and volt age stresses that the thyristor valves could meet in service.The test circuit parameters are carefully chosen to give a close representation of the system par ameters.The sample test results from this synthetic test circuit are comparable with that acquired previously from a conventional Back-to-Back direct test circu it.However,this synthetic test circuit offers several technical advantages and i s superior to the Back-to-Back direct test circuit in terms of economy as well.

[1]  M. L. Woodhouse Voltage and Current Stresses on HVDC Valves , 1987, IEEE Transactions on Power Delivery.

[2]  H.-O. Bjarme,et al.  A new synthetic test circuit for the operational tests of HVDC thyristor modules , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[3]  G. C. Damstra,et al.  Test-circuits for HVDC thyristor valves , 1997 .

[4]  Abb Power OPERATIONAL TESTS OF THE THREE GORGES-CHANGZHOUHVDC THYRISTOR VALVES BY USING A SYNTHETIC TEST CIRCUIT , 2002 .