Problem 13.4 An HVDC system has the following parameters: rated voltage of 500 kV at the inverter, rated current of 2 kA, Rπ = 20 ohms, Rc = 3 ohms/bridge, B = 4 bridges, ignition angle 5β β€ πΌ β€ 30β, extinction angle 18β β€ πΎ β€ 25β , and current margin of 15%. The transformer ratio limits are sufficiently large so they do not come into consideration. The base voltage for the converter AC buses is 115 kV. Determine the operating condition (including the transformer tap ratios) and the active and reactive power transfer at the rectifier and the inverter, assuming that the converter AC buses are at rated voltage. For the rectifier, set the transformer ratio at unity. Calculate the HVDC system operating condition in Problem 13.4 if the AC rectifier bus voltage drops by 20%. Problem 13.4 An HVDC system has the following parameters: rated voltage of 500 kV at the inverter, rated current of 2 kA, Rπ = 20 ohms, Rc = 3 ohms/bridge, B = 4 bridges, ignition angle 5β β€ πΌ β€ 30β, extinction angle 18β β€ πΎ β€ 25β , and current margin of 15%. The transformer ratio limits are sufficiently large so they do not come into consideration. The base voltage for the converter AC buses is 115 kV. Determine the operating condition (including the transformer tap ratios) and the active and reactive power transfer at the rectifier and the inverter, assuming that the converter AC buses are at rated voltage. For the rectifier, set the transformer ratio at unity.

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