H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/24
H02M 7/757 (2006.01) H02J 3/36 (2006.01)
Patent
CA 1233199
20365-2434 ABSTRACT OF THE DISCLOSURE A method and apparatus are described for operating a high voltage d.c. (HVDC) transmission line system connecting two a.c. transmission line systems during normal operation and during malfunction in either the rectifier station or the inverter station of the HVDC system. When a malfunction exists in one station of a HVDC transmission line (e.g.,rectifier station A), then the regular thyristor firings are disabled and a bypass circuit, preferably one or several bridge paths of a converter, are fired. As soon as a corresponding change in the current or voltage occurs at the d.c. voltage connections of the other station (B), this station assumes rectifier operation during which the HVDC transmission line is utilized as a reactive load to stabilize the other system. Once the malfunction has ceased to exist, operation is first resumed in station A by extinguishing the bypass thyristors and subsequently resumed also in station B. This procedure permits stable normal operation in both stations, or bypass operation without using remote control signals during which the HVDC transmission line can be rapidly controlled to stabilize the systems.
475295
Kaufhold Wolfgang
Neupauer Helmut
Wild Georg
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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