Lab Report 1.pdf

Dc current a i2 dc voltage v e2 firing angle bridge1

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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 0.26 -273.5 165 25.3 -26.71 -70.76 0.97 0.90 Data Table 10. Vary the firing angle of bridge2 to make 0.5pu DC current 44. Readjust the firing angle of bridge2 (rectifier) to 23.0° so that DC line current was at 0.7 pu, which was 0.35. 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 -267.4 165 23.0 -73.18 -190.5 0.97 0.92 Data Table 11. Vary the firing angle of bridge2 to make 0.7pu DC current 45. The system operating point compensate the effect of decrease in voltage at the AC side of the bridge2 (rectifier) by decreasing the firing angle of the bridge2 (rectifier). It was because reducing the ac side voltage would results in decrease of DC voltage which would be compensated by decreasing the firing angle of the rectifier which causes DC voltage to increase . 46.The firing angle of the bridge2 was 23.0° 47. The DPF of bridge1 and bridge2 were 0.97 and 0.92 . Both DPF of bridge1 and bridge2 were 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. 48. Increase the ac voltage in bridge2 to its nominal value, which would cause another fluctuation at the rectifier bridge.
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, 49. Increase in the ac voltage at the rectifier causes DC current to increase rapidly. So that amount of power transferred also gets increased. It was because increase in ac voltage causes DC voltage to increase, which would increase the DC line current. Data Table 12. Vary the firing angle of bridge2 to make 0.7pu DC current 50. The System operating point does not compensates by increasing the firing angle of the bridge2 for the effect of increasing the ac voltage at bridge2. It was because of increasing the ac side at bridge2 would increase the dc voltage of bridge2 and increasing the firing angle of bridge2 would decrease the dc voltage of bridge2. 51. From the above observation, it was clear that despite the ac voltage fluctuation at the rectifier bridge, the dc current and power could be kept constant by readjusting the firing angle of bridge2(rectifier). 52.The firing angle of the bridge2 was 23° 53.The DPF of bridge1 and bridge2 were 0.97 and 0.92 . Both DPF of bridge1 and bridge2 were 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. Turned off the power supply. 5. CONCLUSION: From this experiment, following operations are done and observed by maintaining the optimum DPF and learned the importance of system operating point and DPF for the operation of HVDC transmission line. Basic operation of an HVDC Transmission system Reducing the AC voltage of the inverter bridge Voltage Fluctuation on the inverter bridge Both direction of power flow on the transmission line Voltage Fluctuation on the rectifier bridge DC current (A) (I2) DC voltage (V) (E2) Firing angle bridge1 Firing angle bridge 2 Active
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