(a) With SCR control, every electric light switch in the home becomes a potential light dimmer...

 

Transcribed Image Text:

(a) "With SCR control, every electric light switch in the home becomes a potential light dimmer that provides continuously variable operation from full off to full on. In living and dining rooms, light dimmers can provide just the right degree of illumination to fit any mood and, for amateur puppeteers, the basement rumpus room can be converted into a theater, complete with theater as well as stage light dimming equipment." From the above statement, you are required to give suggestion and answer comprehensively to the problems as following, (i) Suggest a home appliance that can be controlled using SCR devices and list down the suitable electrical specifications, control circuit and grid requirement. (4 marks) (ii) Suggest an appropriate converter circuit for controlling the suggested load using SCR devices. The suggested circuit must be clearly and appropriately sketched and labeled. (4 marks) (iii) Explain the operation of the suggested converter circuit in order to fulfil the suggested load and grid requirements. Diagrams, circuits or equations might be required to support your explanation. (4 marks) (b) For this question, Figure Q3(b)(i) and Figure Q3(b)(ii) are referred. Initially the switching profiles of switch voltage Vswi(t) and switch current Iswi(t) is shown in Figure Q3(b)(i) with high switching loss, Pawi(t) during transition from turn-on to turn-off. It causes electromagnetic interference (EMI) noise to gate driver circuit. From this condition, you are requested to (i) Explain the switching loss condition as shown in Figure Q3(b)(i) and Figure Q3(b)(ii), respectively. Diagrams, circuits or equations might be required to support your explanation. (4 marks) (ii) Suggest a suitable circuit that able to reduce the switching loss from Pswl(t) to Psw2(t). A comprehensive explanation of the suggested circuit operation is required. In addition, the suggested circuit must be clearly and appropriately sketched and labeled. (5 marks) (c) In Flexible AC Transmission Systems (FACTS), compensation techniques of critical parameters are crucial in order to enhance controllability and power transfer capability in AC systems. Thus, you are require to identify and explain the operation and characteristics of common compensation techniques. Diagrams, circuits or equations might be required to support your explanation. (4 marks) (a) "With SCR control, every electric light switch in the home becomes a potential light dimmer that provides continuously variable operation from full off to full on. In living and dining rooms, light dimmers can provide just the right degree of illumination to fit any mood and, for amateur puppeteers, the basement rumpus room can be converted into a theater, complete with theater as well as stage light dimming equipment." From the above statement, you are required to give suggestion and answer comprehensively to the problems as following, (i) Suggest a home appliance that can be controlled using SCR devices and list down the suitable electrical specifications, control circuit and grid requirement. (4 marks) (ii) Suggest an appropriate converter circuit for controlling the suggested load using SCR devices. The suggested circuit must be clearly and appropriately sketched and labeled. (4 marks) (iii) Explain the operation of the suggested converter circuit in order to fulfil the suggested load and grid requirements. Diagrams, circuits or equations might be required to support your explanation. (4 marks) (b) For this question, Figure Q3(b)(i) and Figure Q3(b)(ii) are referred. Initially the switching profiles of switch voltage Vswi(t) and switch current Iswi(t) is shown in Figure Q3(b)(i) with high switching loss, Pawi(t) during transition from turn-on to turn-off. It causes electromagnetic interference (EMI) noise to gate driver circuit. From this condition, you are requested to (i) Explain the switching loss condition as shown in Figure Q3(b)(i) and Figure Q3(b)(ii), respectively. Diagrams, circuits or equations might be required to support your explanation. (4 marks) (ii) Suggest a suitable circuit that able to reduce the switching loss from Pswl(t) to Psw2(t). A comprehensive explanation of the suggested circuit operation is required. In addition, the suggested circuit must be clearly and appropriately sketched and labeled. (5 marks) (c) In Flexible AC Transmission Systems (FACTS), compensation techniques of critical parameters are crucial in order to enhance controllability and power transfer capability in AC systems. Thus, you are require to identify and explain the operation and characteristics of common compensation techniques. Diagrams, circuits or equations might be required to support your explanation. (4 marks)

Answer rating: 100% (QA)

a i A suitable home appliance that can be controlled using SCR devices is a fan or pump The electrical specifications for the fan or pump include the power rating of the motor the number of poles the ... View the full answer