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Question 1 -
A bipolar HVDC link operates with ± 300 kV, 600 MW (rated voltage & power) at the rectifier end. The resistance of each line conductors is 20 Ohms. The converters transformers have leakage resistance of 0.15 pu on their own base. There are 2 series connected converters per pole. The AC bus voltages at bot rectifier & inverter are regulated at 230kV.
a. Compute the ratings & turns ratio of the converter transformers at both ends.
b. Find the reactive power supplied at the rectifier and inverter stations.
Assume the following operating conditions: α = γ = 18o.
Question 2 -
A monopolar HVDC link has one bridge at each terminal. The parameters of the links are as follows:
αmin = 5o; γmin = 18o; Rd = 5 Ohms; Rcr = 10 Ohms; Rci = 12 Ohms
Vdor = 115 kV; Iref at the rectifier = 1kA and Iref at the inverter = 900 A
a. If Vdoir = 117.5 kV; calculate Id; α; γ; P & Q
b. Repeat if Vdoir = 120 kV.
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