Analysis of FACTS-Based Voltage Regulation Under Harmonic Distortion, Fault Conditions, Stability Constraints, and Transient Overshoot

Author

Raushan Kumar , Mr. Mukesh Thakre


Abstract

 The continuous growth in electrical energy consumption has increased the operating stress on modern power transmission networks, making voltage stability and reliable power transfer increasingly important. Flexible AC Transmission System (FACTS) controllers provide an effective means of enhancing the voltage profile, power transfer capability, and overall stability of interconnected power systems. In the present study, a continuous power flow analysis of the IEEE 14-bus test system is performed to identify the buses that are most susceptible to voltage instability under increasing loading conditions. The influence of different FACTS controllers, including the Static Synchronous Series Compensator (SSSC), Unified Power Flow Controller (UPFC), Static VAR Compensator (SVC), and Static Synchronous Compensator (STATCOM), is subsequently investigated. The voltage magnitude and phase-angle variations at the critical buses are evaluated for both uncompensated and FACTS-compensated operating conditions. X–V curves are employed to determine and compare the maximum loading capability and voltage stability characteristics of the system. Particular emphasis is placed on the performance of SVC and STATCOM for controlling bus voltage through reactive power compensation. The analysis demonstrates the capability of these shunt-connected compensators to either supply or absorb reactive power according to variations in system operating conditions, thereby maintaining the desired voltage level. Furthermore, the study examines the suitability of SVC and STATCOM for dynamic voltage regulation in power systems subjected to changing and nonlinear load demands. The increasing penetration of nonlinear loads can introduce significant voltage disturbances, highlighting the need for fast and flexible reactive power compensation. MATLAB/Simulink is used to develop the models and perform the simulation of SVC and STATCOM under different operating conditions. The comparative analysis provides an assessment of their contribution to voltage regulation and loading capability and demonstrates the potential of FACTS-based compensation for improving the voltage stability and dynamic performance of modern power systems.


Keywords

Flexible AC Transmission System (FACTS), Voltage Stability, IEEE 14-Bus System, Static VAR Compensator (SVC), STATCOM, Reactive Power Compensation, Dynamic Voltage Control, MATLAB/Simulink, Voltage Regulation.



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References


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