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Stability Improvement of Power Systems Using Shunt Compensation


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DOI: https://doi.org/10.15866/iree.v18i6.23222

Abstract


This paper presents a method for stability improvement for the standard IEEE14 bus system by using Static VAR Compensators (SVCs). The SVC, a shunt Flexible AC Transmission System (FACTS) device, can effectively improve the voltage profile at several buses in the system, thereby improving the overall system stability. In this system, some loads are increased by either (1) switching on a sudden load change parallel to the original loads in the system or (2) scaling the original load by a large factor. The resulting system is an overloaded version of the IEEE14 bus system. A Phasor Measurement Unit (PMU) is installed at each bus in the system to measure accurately the voltage magnitude, the frequency, and the phase angle values in every bus location. This study compares the voltage magnitude and frequency for four cases. In each case, the SVC is installed in a different location in the system. The voltage magnitude values at each bus are recorded before switching on the additional loads, during the period when the additional loads are switched on, and after switching off the additional loads. Each case has been studied separately, and the SVC parameters have been adjusted separately for each case to provide a suitable voltage compensation, while maintaining stable operation. The incorporation of SVCs has shown improvements and advantages in the system's voltage and transient stability. In addition, the overshoot and the settling time of the voltage magnitude and frequency have been recorded to study further the stability of these signals. The best results for voltage magnitude compensation have been shown to occur at the bus where the SVC is installed. The best results in terms of improvement in voltage magnitude have been achieved when the SVC has been installed at bus 3, while the best results in terms of improvements in overshoot for voltage and frequency have been obtained when the SVC has been installed at bus 6.
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Keywords


IEEE 14-bus System; Phasor Measurement Units; Shunt Compensation; Static and Dynamic Voltage Stability; Static VAr Compensator

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References


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