High Voltage Direct Current (HVDC) Transmission System use Direct Current for transmission of bulk power over...

   

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High Voltage Direct Current (HVDC) Transmission System use Direct Current for transmission of bulk power over long distances. Figure 1 show the general construction of a HVDC transmission system. HE First Power grid/ network HOW HVDC transformer Converter 1 Converter station Overheadline DO Converter 2 HVDC transformer Converter station Figure 1 HVDC Substation Layout Lo Second Power grid/ network a) Elaborate the operation of HVDC in transmitting DC power from one point to another point. (4 marks) b) Say that the converter station is operating on a three-phase bridge system, propose a suitable improved/upgraded circuit for both converter station and discuss how the magnitude of the power being transmitted is being controlled. Sketch the circuit and draw appropriate input/output waveforms with respect to the controlling parameter. (6 marks) c) Converter 2 can be replaced with a multilevel inverter so that the performance can be improved. Proposed a suitable circuit arrangement for the converter 2 if it is to be replaced by multilevel inverter. Discuss on how the multilevel structure can improved the output waveform of converter 2. (4 marks) High Voltage Direct Current (HVDC) Transmission System use Direct Current for transmission of bulk power over long distances. Figure 1 show the general construction of a HVDC transmission system. HE First Power grid/ network HOW HVDC transformer Converter 1 Converter station Overheadline DO Converter 2 HVDC transformer Converter station Figure 1 HVDC Substation Layout Lo Second Power grid/ network a) Elaborate the operation of HVDC in transmitting DC power from one point to another point. (4 marks) b) Say that the converter station is operating on a three-phase bridge system, propose a suitable improved/upgraded circuit for both converter station and discuss how the magnitude of the power being transmitted is being controlled. Sketch the circuit and draw appropriate input/output waveforms with respect to the controlling parameter. (6 marks) c) Converter 2 can be replaced with a multilevel inverter so that the performance can be improved. Proposed a suitable circuit arrangement for the converter 2 if it is to be replaced by multilevel inverter. Discuss on how the multilevel structure can improved the output waveform of converter 2. (4 marks)

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