Evaluation of Staged Under Frequency Load Shedding Strategy for Generator Trip Events at Arun Substation Using DIgSILENT Powerfactory

M. FITRA WALDI, MUHAMMAD DAUD, SELAMAT MELIALA, SALAHUDDIN SALAHUDDIN, TEUKU MULTAZAM

Abstract


Frequency stability is a key indicator of power system reliability, as disturbances such as generation loss can cause rapid frequency decline and potentially lead to a blackout. This study evaluates the effectiveness of a load shedding scheme using an Under Frequency Relay (UFR) at the Arun Substation through dynamic simulation in DIgSILENT PowerFactory. The scenario involves a sudden loss of generation, comparing conditions without and with UFR. Results show that without UFR, a 48.421 MW power loss causes the frequency to drop below 42 Hz in less than 16 seconds, leading to system failure. With a two-stage UFR scheme (27.6 MW at 49.5 Hz and 28.4 MW at 49.2 Hz), the frequency decline is arrested and the system stabilizes at 50.12 Hz within about 3 seconds. Thus, the UFR scheme is effective in maintaining system stability.

Keywords


Under Frequency Relay; Load Shedding; Frequency Stability; DIgSILENT PowerFactory; Substation

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References


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DOI: https://doi.org/10.26760/elkomika.v14i2.231

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ISSN (print) : 2338-8323 | ISSN (electronic) : 2459-9638

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