Abstract
For various reasons, the power system stability margin is continuously decreasing. However, in case of Korea, the expansion of the transmission system is facing difficulties due to worsening social acceptability. As an alternative, a technology to increase the power system stability margin using some converter-based facilities is being proposed. In this paper, GS-ESS(Generator Stabilization Energy Storage System) was proposed as a measure to improve the angular stability of synchronous generator. To overcome the limitations of typical ESS frequency measurement methods(using PLLs), GS-ESS directly measures the rotational speed of the generator mechanically and converts it into an electrical signal.<BR>In this case study, PSS/E simulation has been performed to analyze the effect of GS-ESS application. For this simulation, we used the 21 buses test system and GS-ESS was installed in the plant bus. And then we analyzed the effects of improving stability according to capacity and response speed in case of fault on the interconnection line between generator and power system. As a result, this case study showed that GS-ESS can be contributed to improving the angular stability of the synchronous generator.
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