A high-voltage dc (HVDC) converter station is designed to achieve very high power efficiency (about 99%) and, yet, the power losses still amount to a lot of heat being dispersed outside the valve hall. Consequently, the cooling system represents a critical component of an HVDC converter station, consisting of a network of pipes (where liquid coolant flows), outdoor fan-coolers (to disperse the heat to the ambient air), and an electric motor-compressor. Moving the coolant through this network of pipes represents a significant load, especially at start up. An industrial-grade induction motor has been chosen for this task and has the characteristics shown in Table A1. (i) (ii) When the HVDC converter station converts 1 GW, calculate the amount of power losses it generates and comment on the scale of the cooling system. Calculate (per phase and magnitude only) the start-up and full- load (i.e. at rated current) impedances for this induction motor. Calculate how much reactive power compensation is needed to correct the power factor back to 0.95 lagging. (iv) Suggest a few design options for managing the starting up of the cooling system. Make sure to provide a short argument to support your engineering solutions.
A high-voltage dc (HVDC) converter station is designed to achieve very high power efficiency (about 99%) and, yet, the power losses still amount to a lot of heat being dispersed outside the valve hall. Consequently, the cooling system represents a critical component of an HVDC converter station, consisting of a network of pipes (where liquid coolant flows), outdoor fan-coolers (to disperse the heat to the ambient air), and an electric motor-compressor. Moving the coolant through this network of pipes represents a significant load, especially at start up. An industrial-grade induction motor has been chosen for this task and has the characteristics shown in Table A1. (i) (ii) When the HVDC converter station converts 1 GW, calculate the amount of power losses it generates and comment on the scale of the cooling system. Calculate (per phase and magnitude only) the start-up and full- load (i.e. at rated current) impedances for this induction motor. Calculate how much reactive power compensation is needed to correct the power factor back to 0.95 lagging. (iv) Suggest a few design options for managing the starting up of the cooling system. Make sure to provide a short argument to support your engineering solutions.
Introductory Circuit Analysis (13th Edition)
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Transcribed Image Text:A high-voltage dc (HVDC) converter station is designed to achieve very
high power efficiency (about 99%) and, yet, the power losses still
amount to a lot of heat being dispersed outside the valve hall.
Consequently, the cooling system represents a critical component of an
HVDC converter station, consisting of a network of pipes (where liquid
coolant flows), outdoor fan-coolers (to disperse the heat to the ambient
air), and an electric motor-compressor. Moving the coolant through this
network of pipes represents a significant load, especially at start up.
An industrial-grade induction motor has been chosen for this task and
has the characteristics shown in Table A1.
(i)
(ii)
When the HVDC converter station converts 1 GW, calculate the
amount of power losses it generates and comment on the scale
of the cooling system.
Calculate (per phase and magnitude only) the start-up and full-
load (i.e. at rated current) impedances for this induction motor.
Calculate how much reactive power compensation is needed to
correct the power factor back to 0.95 lagging.
(iv) Suggest a few design options for managing the starting up of the
cooling system. Make sure to provide a short argument to
support your engineering solutions.
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