Consider a HVDC link which uses thyristor based line commutated converters as shown in the figure. For a power flow of 750 MW from system 1 to system 2, the voltages at the two ends, and the current, are given by: V 1 = 500 kV, V 2 = 485 kV and I = 1.5 kA. If the direction of power flow is to be reversed (that is, from system 2 to system 1) without changing the electrical connections, then which one of the following combinations is feasible?

Correct Answer is : V1 = -485 kV, V2 = -500 kV and I = 1.5 kA

V 1 = -500 kV, V 2 = -485 kV and I = 1.5 kA

V 1 = -485 kV, V 2 = -500 kV and I = 1.5 kA

V 1 = 500 kV, V 2 = 485 kV and I = -1.5 kA

V 1 = -500 kV, V 2 = -485 kV and I = -1.5 kA

GATE Electrical Engineering (EE) 2015 Shift 1 Solved Paper

Question : 26 of 65

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Consider a HVDC link which uses thyristor based line commutated converters as shown in the figure. For a power flow of 750 MW from system 1 to system 2, the voltages at the two ends, and the current, are given by: V₁ = 500 kV, V₂ = 485 kV and I = 1.5 kA. If the direction of power flow is to be reversed (that is, from system 2 to system 1) without changing the electrical connections, then which one of the following combinations is feasible?

V₁ = -500 kV, V₂ = -485 kV and I = 1.5 kA
V₁ = -485 kV, V₂ = -500 kV and I = 1.5 kA
V₁ = 500 kV, V₂ = 485 kV and I = -1.5 kA
V₁ = -500 kV, V₂ = -485 kV and I = -1.5 kA

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