Lab Report 1.pdf

Therefore dc current flow on the transmission line

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. Therefore, dc current flow on the transmission line was always from station 1 to station 2 . The DC power on the transmission was positive so that the power flow flows from station1 to station2. 8. DPF of bridge2 decreases as the firing angle of bridge2 (inverter) decrease . DPF was equal to maximum value (1) for the firing angle 0° and 170° due to there was no phase shift between voltage and current . The value of the DPF decreases rapidly for the firing angle of the bridge2 (inverter) from 170° to 90 ° because of line current lags behind phase voltage due to inductance. 9. The DPF of bridge2 was 0.83, which was not acceptable due to the value of 0.88 was considered to be bit low and unacceptable. DPF values were range from 0 to 1. DPF values of 0.9 and above were generally acceptable. Varying the firing angle of the rectifier bridge 10. Set the firing angle of bridge2 to 150 °, so that the dc line current I dc was at 0.75 pu which was 0 . 375A. 11. Vary the firing angle of bridge1 to set the dc line current I dc to each value listed in the Table1. For each DC line current measure the system parameters like firing angle of bridge 1 & 2, DC line current and voltage, active power, reactive power and DPF.
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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 bridge 1 DPF bridge 2 0.15 288 23 150 63.25 145.5 0.93 0.88 0.2 285.2 25 150 54.72 127 0.91 0.88 0.25 283.4 26 150 50.32 116.7 0.90 0.89 0.3 280.7 28 150 41.96 95.7 0.89 0.88 0.35 279.2 29 150 38.26 87.06 0.88 0.87 0.4 277.2 30 150 33.5 74.46 0.87 0.88 0.45 275.5 31 150 29.8 64.4 0.86 0.87 0.5 273.6 32 150 25.71 52.63 0.85 0.88 Data Table 2. Varying the firing angle of bridge1 at constant bridge2 firing angle 150° 12. According to the recorded data, by increasing the firing angle of bridge2, the dc current was increasing . So that dc current flowing through transmission system can be varied by firing angle of the bridge1 (rectifier) and thus the amount of power transferred to be adjusted. To operate an HVDC transmission, system operating point was required. The point where the voltage-current relations of the rectifier and inverter bridges intersect was considered to be the operating point and it was done by varying the firing angles of thyristor bridges 1 and 2. 13. DPF of bridge1 decreases as the firing angle of bridge1 (rectifier) increase . DPF was equal to maximum value (1) for the firing angle 0° and 170° due to there was no phase shift between voltage and current . The value of the DPF decreases for the firing angle of the bridge1 (rectifier) from to 90 ° because of line current lags behind phase voltage due to inductance. 14. The DPF of bridge1 was 0.85, which was not acceptable due to the value of 0.88 was considered to be bit low and unacceptable. DPF values were range from 0 to 1. DPF values of 0.9 and above were generally acceptable. Effect of reducing the voltage at the AC side of the inverter bridge 15. Set the firing angle of bridge1 to 75° to decrease the bridge1 dc voltage near the minimum value. The dc line current I dc (I2) should be null.
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, 16. Set the firing angle of bridge2 to 165° 17. On the Regulating Autotransformer of converter station 2, set the Buck-
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