Analysis of the 3 phase fully controlled bridge converter in the rectifier mode
Analysis of 3 phase fully controlled bridge converter in rectifier mode:
Fig: waveforms of 3 phase fully controlled converter: Analysis of converter in the rectifier mode
- We see that i0 itself has a ripple at a frequency six times the input frequency. The closed from expression of i0, is complicated. However, considerable simplification in the expression of ia can be obtained if i0 is replaced by its average value I0. This approximation will be valid provided the ripple on i0 is small, i.e, the load is highly inductive. The modified input current waveform will then be ia which can be expressed in terms of a fourier series as
Questions of this topic
A three phase fully controlled bridge converter operating from a 3 phase 220 V, 50 Hz supply is used to charge a battery bank with nominal voltage of 240 V. The battery bank has an internal resistance of 0.01 ohms and the battery bank voltage varies by ± 10 percent around its nominal value between fully charged and uncharged condition. Assuming continuous conduction find out. (i) The range of firing angle of the converter. (ii) The range of ac input power factor. (iii) The range of charging efficiency. When the battery bank is charged with a constant average charging current of 100 Amps through a 250 mH lossless inductor.