Improvement of Power System Transient Stability Using Fast Valving: A Review
Fast valving of turbines is one of the effective techniques for improving the stability of a power system under large and sudden disturbances. The aim of the present large interconnected power systems is to provide uninterrupted electric power supply to the consumers with highest reliability. On the other hand interconnections also increase the chances of the system being subjected to large disturbances. Fast valving plays a significant role in reducing the impact of large disturbance by instantly decreasing steam turbine power and enhancing the stability of the system. This concept was introduced for the first time in 1925 . Even after more than 7 decades of stability research, certain aspects of fast valving schemes are not sufficiently explored and need practical experience. This paper extensively presents a survey of the literature over past 20 years in the area. Some major contributions of the past have also been covered. Based on the applications of fast valving schemes and present trend, scope for future work has also been discussed.
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