Economics dictates the heavy utilization of the major ac and dc transmission paths in the Western United States. To achieve interconnected network stability with these heavy power transfers, extensive remedial action schemes have been implemented by the various transmission projects. These remedial action schemes often pose an operating reliability problem as well as undesirable impacts on non-project systems since activation of these schemes could result in network separation. This paper explores the potentials of utilizing the controllability of the dc lines to reduce the complexity of the remedial schemes or to increase the stability performance of the system so that the impact of existing and future projects on nonproject systems can be minimized.
During the spring of 1991, several severe geomagnetic disturbances were recorded in North America, and particularly in Northem Quebec, where Hydro-Quebec's La Grande generation complex and transmission system are located. As a result of these disturbances, the Quebec-New England Phase I1 HVDC system was affected by transformer saturation and harmonic voltage distortion due to geomagnetic induced current (GIC). This paper presents an analysis of the phenomenon observed at Radisson, the northemmost terminal in the system.A central issue which is discussed in the paper is the reflection of the dc side impedance to the ac side for operating converters, and the effect of this reflection on the harmonic impedance as viewed from the ac side.
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