Series compensations are implemented to reduce line reactance, improve voltage profiles, and boost power transfer capacity in long-distance transmissions. This study evaluates the effects of series compensation on load flows, voltage stability, transmission losses, and power transfer using PSS？E simulations coupled with Newton-Raphson load flow analysis. The study used a systematic placement methodology combining Voltage Sensitivity Analysis and Line Reactance Screening to identify optimal capacitor locations in the IEEE 14-bus network, specifically targeting Lines 13 - 14 and 9 - 14, both directly connected to the weakest bus. Simulation scenarios across 0% - 50% compensation levels reveal improvements of up to +1.1% in weakest-node voltage, approximately 15% - 16% increase in power transfer capacity, and measurable reductions in line losses in both lines. These outcomes highlight significant system performance gains even in lightly loaded networks. A first-level SSR frequency screening is also reported to verify that the 20% - 50% compensation range does not introduce an obvious resonance concern for the benchmark case.
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