FACTS Devices and Voltage Stability in Power Systems
Summary
Flexible AC transmission system (FACTS) devices encompass a suite of power-electronic controllers designed to enhance the controllability and increase the power transfer capability of AC transmission networks. By injecting or absorbing reactive power, adjusting line impedance or modulating phase angle, these devices address voltage fluctuations, improve damping of oscillations and facilitate power flow control. Voltage stability—defined as the ability to maintain acceptable voltages following disturbances—has become increasingly critical with rising levels of renewable generation and long transmission distances. FACTS devices such as static VAR compensators, thyristor-controlled series capacitors and unified power flow controllers serve to bolster the static and dynamic voltage stability margins of modern grids, mitigate voltage collapse phenomena and enable secure operation under high loading and contingency scenarios. The strategic deployment and coordination of these controllers underpin efforts to integrate variable energy sources, reduce losses, defer network reinforcement and enhance overall system resilience on a global scale.
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FACTS Devices and Voltage Stability in Power Systems publication trend
The graph below shows the total number of articles in facts devices and voltage stability in power systems across all publications each year (not limited to Nature Index journals).
Technical terms
FACTS devices: Flexible AC transmission system technologies that use power electronics to control voltage and power flows in AC networks.
Voltage stability margin: The buffer between actual operating voltage and the voltage collapse point under incremental loading or disturbances.
Static VAR Compensator (SVC): A shunt-connected device that provides continuously adjustable reactive power to support voltage levels.
Thyristor-Controlled Series Capacitor (TCSC): A series device that adjusts line reactance via thyristor-switched capacitors to regulate power flow.
Unified Power Flow Controller (UPFC): An integrated device combining series and shunt elements to control voltage magnitude, line impedance and phase angle simultaneously.
References
- A comprehensive review of FACTS devices in modern power systems: Addressing power quality, optimal placement, and stability with renewable energy penetration. Energy Reports (2024).
- Investigation of the impact of PSO, ABC, BFO and Cuckoo search optimization techniques on UPFC device for sustainable voltage stability margin improvement. Journal of Electrical Systems and Information Technology (2023).
- Power system operation enhancement using a new hybrid methodology for optimal allocation of FACTS devices. Energy Reports (2022).
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