Lab Report 1.pdf

24 the dpf of bridge1 and bridge2 were 092 and 097

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24. The DPF of bridge1 and bridge2 were 0.92 and 0.97 . Both DPF of bridge1 and bridge2 were acceptable . 25.The power transferred via the transmission line (Idc=0.7 pu=0.35A) was 73.18W DC current (A) (I2) DC voltage (V) (E2) Firing angle bridge1 Firing angle bridge 2 Active Power (W) Reactive Power (VAR) DPF bridge1 DPF bridge2 0.35 267.4 23.0 165 73.18 190.5 0.92 0.97 Data Table 4. Vary the firing angle of bridge1 to make 0.7pu DC current 26.Reduce the ac voltage at bridge2 which causes the line current to increase. The value of line current may even exceed the maximum dc line current (1.0 pu). Adjust the ac voltage at bridge2 so that line current was at 1.0 pu.
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, DC current (A) (I2) DC voltage (V) (E2) Firing angle bridge1 Firing angle bridge 2 Active Power (W) Reactive Power (VAR) DPF bridge1 DPF bridge2 0.35 267.4 23.0 165 73.18 190.5 0.92 0.97 0.58 243.6 22.8 165 85.9 219.6 0.96 0.97 Data Table 5. Vary the firing angle of bridge1 to make 1pu DC current 27. From this manipulation, it was evident that fluctuation of ac voltage at the bridge2 makes the line current to increase rapidly which was undesirable. The DC line current could be reduced by either increasing the firing angle of the bridge1 or reduce the ac voltage of the bridge2. 28. The System operating point compensates by increasing the firing angle of the bridge1for the effect of decreasing the ac voltage at bridge2. It was because of decreasing the ac side at bridge2 would decrease the dc voltage of bridge2 and increasing the firing angle of bridge1 would decrease the dc voltage of bridge1. Now decrease of both dc voltages would be almost equal, so that system operating point would get compensated. 29. The firing angle of bridge1 (rectifier) was 23° and the DPF of bridge1 and bridge2 were 0.96 and 0.97 . Both DPF of bridge1 and bridge2 were acceptable . DPF values of 0.9 and above were generally acceptable. Higher the DPF , the lower the amount of reactive power exchanged between a thyristor bridge and the AC source to which it was connected. 30. Increase the AC side of the inverter bridge to 100%, which makes the DC line current and power transferred in the transmission line gets decreased rapidly. DC current (A) (I2) DC voltage (V) (E2) Firing angle bridge1 Firing angle bridge 2 Active Power (W) Reactive Power (VAR) DPF bridge1 DPF bridge2 0.58 243.6 22.8 165 85.9 219.6 0.96 0.97 0.35 267.4 23.0 165 73.18 190.5 0.92 0.97 Data Table 6. Increase the AC voltage of bridge2 to nominal value
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, 31. The System operating point compensates by decreasing the firing angle of the bridge1for the effect of increasing the ac voltage at bridge2. It was because of increasing the ac side at bridge2 would decrease the dc current of bridge2 and increasing the firing angle of bridge1 would decrease the dc current of bridge1. 32. From the above observation, it was clear that despite the ac voltage fluctuation at the inverter bridge, the dc current and power could be kept constant by readjusting the firing angle of bridge1(rectifier) 33.The firing angle of the bridge1 was 23° 34.The DPF of bridge1 and bridge2 were 0.92 and 0.97 . Both DPF of bridge1 and bridge2 were acceptable . Higher the DPF , the lower the amount of reactive power
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