Stability analysis of medium sized power plants subjected to grid events

Year 2020, Volume: 11 Issue: 2, 491 - 498, 15.06.2020

Levent Kılıç , Ayşen Basa Arsoy

https://doi.org/10.24012/dumf.538534

Abstract

Connection of small generating
units in the medium voltage distribution system is increasing substantially.
Such units, called distributed generation, can have a significant impact on,
load flow, shortcircuit, voltage, frequency, power quality, stability,
islanding and synchronized running, protection and reliability. In this study,
the stability impact of a private sector power plant in Thrace region having
synchronous generators driven by gas engine and gas turbine has been
investigated in terms of fault ride through capability. Critical clearing time
has been determined, once the criteria of fault ride through capability were
explored. Grid operators do limit penetration levels of such plants and can
also disconnect available units when grid fails. Stability is affected by
voltage dip much worsely than penetration levels. It has been seen that the
disconnection of power plants is not necessary, when the voltage dip restricted
to 0,5 pu. Also that the stability is positively affected when the power factor
is decreased to 0,8 from 1,0. The results also show that even 100% penetrated
synchronous generator based power plants in distribution system do not affect
stability badly in steady state operation.

Keywords

Stability analysis, power plants, distribution grid, gas engine, gas turbine, grid events

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