Nt1310 Unit 4 Case Study

According to Fig. 5, the compensation of a voltage sag/swell disturbance at bus B causes a positive sequence voltage at the coupling transformer (Vseries _= 0), since VA _= VB. Moreover, Vseries and iPB in the coupling transformer leads to a circulating active power P inner in the iUPQC. Additionally, the compensation of the load PF increases the current supplied by the shunt converter. The following analysis is valid for an iUPQC acting like a conventional UPQC or including the extra compensation like a STATCOM. First, the circulating power will be calculated when the iUPQC is operating just like a conventional UPQC. Afterward, the equations will include the STATCOM functionality to the grid bus A. In both cases, it will be assumed that the …show more content…
Equations are derived from the constraint of keeping unitary the PF at bus A. In this case, the current passing through the series converter is responsible only for supplying the load active power, that is, it is in phase (or counter phase) with the voltages VA and VB. Consequently, the coherence of the power ﬂow is ensured through the equation. If a voltage sag or swell occurs, P series and P shunt will not be zero, and thus, an inner-loop current (inner ) will appear. The series and shunt converters and the aforementioned circulating active power (P inner ) ﬂow inside the equipment. Thus, demonstrates that P inner depends on the active power of the load and the sag/swell voltage disturbance. In order to verify the effect on the power rate of the series and shunt converters, a full load system SB = P 2 + Q2 = 1 p.u. with PF ranging from 0 to 1 was considered. It was also considered the sag/swell voltage disturbance at bus A ranging k sag/swell from 0.5 to 1.5. In this way, the power rating of the series and shunt converters. Fig. 6 depicts the apparent power of the series

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