Generator Voltage Building-up Field Test for 500kV Transformer Energization for Black-start Power System

Abstract

Considering the risk of blackout, Kyushu electric power company has studied about power system restoration at blackout start. Power system at blackout start is so small that over voltage which does not rise in normal power system is able to rise, because of transient phenomena and saturation of transformer which are caused by voltage application. Power system transformers should be applied its voltage as low as possible, ideally from zero, to prevent over-voltage problem. This paper reports field test results of voltage application by a voltage building-up procedure to a 500 kV-1000 MVA power system transformer through a transmission line.

Analysis on Sensitivity of Power System Stability to Generator Parameters

“…In case generator parameters are mistaken or their combinations are inappropriate, it is very likely to cause decision-making errors or deviations from optimal operating points, bringing unforeseen or unfavorable outcomes. Currently, however, strictly and accurately testing and checking generator parameters are actually impractical and impossible; because in modern bulk power system the number of generators X. M. Sun is huge, the field tests [3] [4] on each generator are unavoidably time and cost consuming; what's more, generator parameters may change with time and operating conditions. Therefore, the electrical engineers at the electric power dispatching center really need a simple and practical method for testing and checking generator parameters quickly and efficiently.…”