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Transcript
Therefore, if is and ic have the same amplitude, the phase b current can reduce down to 0. At
this situation, according to (9.33), the auxiliary capacitance is chosen to be 1 pu.
(a)
(b)
Figure 9.11 Phasor diagram of (a) SSVL and (b) SSVC.
9.4 Experimental Results
A 1 kVar solid state variable capacitor prototype is built for validation purpose with 100 V dc
voltage.
Figure 9.12 shows the ac source voltage and current with the dc voltage ripple, if the auxiliary
phase leg, capacitor and smoothing inductor are not connected at all. The dc capacitance in this
case was 820 uF, with a voltage ripple of 13%. In order to maintain a 5% voltage ripple
requirement, the dc capacitance is needed to be 3 mF.
155