This paper presents an evaluation for the voltage regulators adopted in the digital dual-loop voltage-controlled, LC-filtered voltage-source converters. Given the proportional control on the filter inductor current, four different capacitor voltage regulators implemented in the αβ frame are compared. The analysis elaborates that the basic proportional and resonant voltage regulator limits the control bandwidth of the voltage loop, and also results in a large non-passive impedance region, which can lead to harmonic instability. Four enhanced voltage controls are then presented, aiming to improve the transient performance of the voltage loop and the passivity of the output impedance of the converter. Experimental tests corroborate the theoretical analysis.
|Konference||2019 IEEE Energy Conversion Congress and Exposition (ECCE)|
|Periode||29/09/2019 → 03/10/2019|
|Navn||IEEE Energy Conversion Congress and Exposition|