AVS1230 Electrical SystemsF23 (1)

Sketch and label the main working components of a wind turbine. Describe the functionality of each of the parts.  List various foundation structure for offshore wind turbines and describe their advantages and disadvantages and relate their configuration to appropriate water depth.

Q2 (a) Outline with the aid of a suitable diagram the necessary power conversion stages required to interface a small permanent magnet (PM) wind generator to a 3 phase AC grid. (b) Given the operating conditions for a stand alone star connected 3 phase synchronous generator outlined in Table Q2b construct a scaled phasor diagram and determine the resultant load current and power factor. On the same phasor diagram indicate the resultant changes when the load current increases by approximately 20% for no change in (lagging) power factor or excitation voltage. Value Parameter V. 415V Excitation Voltage Load Angle 300V 20° Xs 1.50 Table Q2b A star connected 3 phase wound field synchronous generator with a synchronous reactance of 120 is connected to a 11kV (line) grid and supplies 1MW at 0.92 lagging power factor at its terminals. Calculate the phase current and resultant voltage across the synchronous reactance (Vxs), and from a scaled phasor diagram graphically determine the required…

(Q1f, Draw and compare the per-phase electrical equivalent circuits of a transformer and of an induction motor. Using simple magnetic circuits, explain how the values of the magnetising (shunt) impedances compare in the two devices and what is the cause of the difference between the two? Figure 2. A transformer and an induction motor. Among other differences, one is typically rectangular, and the other one is round :D

ELECTRIC MACHINERY  do the (iii, iv v)

Full calculation with any assumption needed. All sub questions please as it is all related.

subject

What are FACTS (Flexible AC Transmission Systems) devices, and how do they enhance power system stability and control?

What are FACTS (Flexible Alternating Current Transmission Systems) devices, and how do they enhance power system control?

Which one of the following d-c machine losses is determined by applying a standard value rather thanby measurement?A. Friction and windage lossB. Core lossC. Copper lossD. Stray-load loss Note: I have doubts if it is the letter B or the letter D, can you help me in this question, thanks.

What is FACTS (Flexible AC Transmission System), and how does it enhance the control and stability of power systems?

. A 20 kW compound generator works on full load with terminal voltage of 250 V. The armature, series, and shunt windings have resistances of 0.05-ohm, 0.025 ohm, and 100 ohms, respectively. If the machine is connected short shunt, the emf generated is nearest to. (Our subject is Electrical Machines 1 ) (I need a clear answer and solution. Thank you so much)

Q4. Figure Q4. shows a power system with one generator, two transformers, a line and a load. Zload=0.3+j0.102 G Vgen-415/0°V R = 0.02 2 tot ZLine=1+j0.10 600 kVA 0.415/11 kV Y-Y XT1=6% tot 500 kVA 11/0.415 kV Y-Y XT2=5% Figure Q4. A Simple Power System