Module EE3603: Power Engineering Examiner: Dr D Nankoo Question 1 a) Flexible AC Transmission Systems offer a technical

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Module Ee3603 Power Engineering Examiner Dr D Nankoo Question 1 A Flexible Ac Transmission Systems Offer A Technical 1 (70.97 KiB) Viewed 27 times

Module EE3603: Power Engineering Examiner: Dr D Nankoo Question 1 a) Flexible AC Transmission Systems offer a technical solution to the possibility of increasing the efficiency and flexibility of existing transmission lines. You have been asked to provide an overview of the benefits of using FACTS to the Evergreen Power Grid company. How would you summarise the use of FACTS to this company. [5 Marks] b) A concern of the Evergreen Power Grid is the amount of active power that can be transmitted through one of their transmission lines. Given that this particular transmission line links two AC voltage sources, explain how the active power flow in this line could be calculated. Further, how can the direction of power flow be determined, and what factor has the greatest effect on the amount of power flow possible? Use a circuit diagram and phasor diagram to aid your answer. [8 Marks] c) One of the FACTS devices that the Evergreen Power Grid has chosen to put in place is the Thyristor Switched Series Capacitor (TSSC), as shown below in Figure Q1.c). The TSSC is a series compensator. Explain its function and operation. + + Ver +Vcm-1 Vom 1 DK 4 4 Figure Q1.c) d) Explain the function of the circuit shown below in Figure Q1.d). +V« R₁ IT ww V₁ NN DISZ Photo-SCR DK R₂ A TL G Figure Q1.d) Page 2 of 5 m-1 DK Cm PK DK [3 marks] [4 Marks]