This study examines the effect of power factor correction (PFC) using delta-connected capacitor banks in a 150 kW, 3-phase induction motor system, as simulated in MATLAB/Simulink. Three scenarios were modeled: no compensation, fixed capacitor compensation, and compensation under varying loads (50%, 75%, and 100%). Initially, the motor operated with a poor power factor of 0.707, resulting in high apparent power (247.5 kVA) and reactive power losses (175 kVAr). With capacitor banks installed, the power factor improved to 0.98, reducing reactive power demand by about 139.4 kVAr and decreasing apparent power to 178.5 kVA. This resulted in lower line currents and reduced distribution losses. The study further examined how capacitor sizing varies with load and power factor targets. The required capacitance per phase reached up to 859 µF, scaling proportionally with the load and the desired correction. A 3D surface plot highlighted increased capacitance requirements under heavier loads and stricter correction goals, offering practical insights for capacitor bank design. Analysis revealed a potential annual demand charge saving of £552 due to a 69 kVA reduction in demand. PFC also improved voltage stability and reduced stress on transformers and cables, confirming its effectiveness for industrial energy optimization
Ngang et al. (Fri,) studied this question.
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