Voltage stability analysis in Power system using PMUs and UPFC

Suresh Babu Palepu, M. Damodar Reddy

Abstract


Voltage instability has drawn the attention of both researchers and utilities due to the numerous system outages that have been linked to it over the past several decades in many places of universe. The improvement of synchrophasor techniques enables real-time monitoring and management of the network’s stability in voltage concern. This study recommends employing strategically placed synchrophasor measuring units (PMUs) to measure the margin of voltage-stability on-line and control it with a unified power flow controller (UPFC). At the critical bus, UPFC has been placed in accordance with the least magnetic and active power load ability for most of the line outages. UPFC provides actual and reactive power to the system according to the variation between the base voltage and its node value. Node voltages are calculated using PMU measurements at regular intervals, and as needed, actual and magnetic power is subsequently delivered to the system online. Continuous checks are made of the wider voltage stability margin caused by the UPFC's injection of reactive and actual power. The efficiency of the proposed method for on-line management and monitoring of voltage-stability margin (VSM) has been demonstrated using simulations on the IEEE 14-bus system and the New England 39-bus system.


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