HVDC Homo polar links uses

One conductor usually of negative polarity

One conductor usually of positive polarity

Two conductors of positive and negative polarity

Two conductors of negative polarity

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 = -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

A DC reactor is connected in series with each pole of a converter station in order to

supply reactive power to the converter

prevent commutation failures in the inverter

supply reactive power to the converter

increase the power transfer capability

Explore topic-wise MCQs in Power Systems.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Power Systems knowledge and support exam preparation. Choose a topic below to get started.

1.	HVDC Homo polar links uses
A.	One conductor usually of negative polarity
B.	One conductor usually of positive polarity
C.	Two conductors of positive and negative polarity
D.	Two conductors of negative polarity
Answer» E.

Discussion

2.	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?
A.	V1 = -500 kV, V2 = -485 kV and I = 1.5 kA
B.	V1 = -485 kV, V2 = -500 kV and I = 1.5 kA
C.	V1 = 500 kV, V2 = 485 kV and I = -1.5 kA
D.	V1 = -500 kV, V2 = -485 kV and I = -1.5 kA
Answer» C. V1 = 500 kV, V2 = 485 kV and I = -1.5 kA

Discussion

3.	A DC reactor is connected in series with each pole of a converter station in order to
A.	prevent commutation failures in the inverter
B.	supply reactive power to the converter
C.	improve system stability
D.	increase the power transfer capability
Answer» B. supply reactive power to the converter

Discussion