Figure B2 shows an HVDC system connecting the 400 kV electricity networks of two countries (System A and System B) through a 400 km submarine link, capable of transferring up to 600 MW. Each cable has a dc voltage rating of 300 kV, and a resistance of 0.01 /km. (i) (ii) The primaries of the transformers at each end of the link are connected to the 400 kV ac network. Calculate the highest value for the transformer secondary line voltages. Is it the best option to select this highest value for the transformer secondary line voltage, and why? αд and ag are the delay angles of the converters at System A and System B respectively. 600 MW is to be transferred from System A to System B. Calculate ag if aд is 5 degrees. Two big power stations in System A are closed for maintenance, so 600 MW now needs to be transferred from System B to System A. (i) Explain how this would be achieved. How would this affect: (ii) (!!!) the direction of current flow in the cables; the voltage polarity of the cables? Sketch the waveform for the voltage (on the dc side) across one of the converters in System B when it is working with the delay angle calculated in part b). (Use the three-phase worksheet provided. Write your examination number on the worksheet, and fasten it into the exam script book). 사 411 HI + 400 kV (line) stem A 400 km System B
Figure B2 shows an HVDC system connecting the 400 kV electricity networks of two countries (System A and System B) through a 400 km submarine link, capable of transferring up to 600 MW. Each cable has a dc voltage rating of 300 kV, and a resistance of 0.01 /km. (i) (ii) The primaries of the transformers at each end of the link are connected to the 400 kV ac network. Calculate the highest value for the transformer secondary line voltages. Is it the best option to select this highest value for the transformer secondary line voltage, and why? αд and ag are the delay angles of the converters at System A and System B respectively. 600 MW is to be transferred from System A to System B. Calculate ag if aд is 5 degrees. Two big power stations in System A are closed for maintenance, so 600 MW now needs to be transferred from System B to System A. (i) Explain how this would be achieved. How would this affect: (ii) (!!!) the direction of current flow in the cables; the voltage polarity of the cables? Sketch the waveform for the voltage (on the dc side) across one of the converters in System B when it is working with the delay angle calculated in part b). (Use the three-phase worksheet provided. Write your examination number on the worksheet, and fasten it into the exam script book). 사 411 HI + 400 kV (line) stem A 400 km System B
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:Figure B2 shows an HVDC system connecting the 400 kV electricity
networks of two countries (System A and System B) through a 400 km
submarine link, capable of transferring up to 600 MW. Each cable has
a dc voltage rating of 300 kV, and a resistance of 0.01 /km.
(i)
(ii)
The primaries of the transformers at each end of the link are
connected to the 400 kV ac network. Calculate the highest
value for the transformer secondary line voltages.
Is it the best option to select this highest value for the
transformer secondary line voltage, and why?
αд and ag are the delay angles of the converters at System A and
System B respectively. 600 MW is to be transferred from System A to
System B. Calculate ag if aд is 5 degrees.
Two big power stations in System A are closed for maintenance, so
600 MW now needs to be transferred from System B to System A.
(i) Explain how this would be achieved.
How would this affect:
(ii)
(!!!)
the direction of current flow in the cables;
the voltage polarity of the cables?
Sketch the waveform for the voltage (on the dc side) across one of the
converters in System B when it is working with the delay angle
calculated in part b).
(Use the three-phase worksheet provided. Write your examination
number on the worksheet, and fasten it into the exam script book).
사
411
HI
+
400 kV
(line)
stem A
400 km
System B
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