Abstract:
This article enhances transformerless unified power quality conditioner (TL-UPQC) functionality. Exchanging reactive power between the system and the grid to regulate grid voltage is possible with an improved control mechanism.
One converter controls load and grid-side voltages. This creates a phase angle between input current and voltage. The system’s capacitive or inductive reactance is controlled. An extra ac voltage control loop was created.
Reformed inner current loop receives reference information from two outside voltage loops. The upgraded control approach uses TL-UPQC local data without sensor circuits. The TL-UPQC system’s typical functions have been enhanced, therefore system modeling and control design should be developed.
A small-signal model of power stage and controller dynamics is proposed. For optimal performance, grid impedance design guidelines are created. To test models and system performance, a 500 VA / 120 V, 60 Hz prototype was developed. Present and discuss steady-state and transient experimental data.
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