Long-term voltage stability assessment using Quasi-Steady State Simulation in Matlab

A Quasi Steady State Simulator (QSSS) for long term voltage stability assessment has been developed, tested and verified in Matlab. Theory and modelling assumptions behind QSSS are explained, including many elements present in long term voltage stability scenarios. The software was developed to perf...

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Main Authors: Valverde Mora, Gustavo, Araya Padilla, Eddie
Format: Artículo
Language: Inglés
Published: 2015
Subjects:
Online Access: http://revistas.ucr.ac.cr/index.php/cienciaytecnologia/article/view/19665
http://hdl.handle.net/10669/14666
Summary: A Quasi Steady State Simulator (QSSS) for long term voltage stability assessment has been developed, tested and verified in Matlab. Theory and modelling assumptions behind QSSS are explained, including many elements present in long term voltage stability scenarios. The software was developed to perform large contingencies for N-bus systems with classical representation of generators and motors in stability studies, including simple control models of Automatic Voltage Regulators (AVR), Overexcitation Limiters (OEL) and Load Tap Changer (LTC). The simulator was finally compared to full time domain simulations in small power systems, showing good accuracy and low computational efforts. It was found that QSSS is able to follow the long term evolution of voltages when the system is still short term stable after each discrete change.