Abstract:
A series compensator with uneven voltage sag ride-through is proposed for grid-connected induction motors. Conventional three-phase voltage source inverters (VSIs) regulate motor voltages. The grid, open-ended three-phase machine, and VSI are connected in sequence.
The proposed technique works for large pumps and fans that don’t need frequency fluctuation. Without a dc source or injection transformer, the energy minimized compensation (EMC) approach treats the VSI dc-link voltage as a floating capacitor.
The minimal grid voltage positive component (sag severity) for EMC functioning depends on motor load. Unbalanced voltage may raise dc-link voltage. The suggested compensator’s ride-through capabilities under grid voltage disruptions was tested with a 1.5-hp four-pole induction motor.
Even without a passive filter, the suggested system has low grid current total harmonic distortion (THD). The operating principle, converter output voltage analysis, pulsewidth modulation method, control approach, and component ratings are covered. To prove system practicality, simulation and experimental data are shown.
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