The sensitivity of a node to real power changes is 100 MW/kV of line voltage and that to reactive power changes is 10 MVAr/kV of line voltage. (v) How much reactive compensation would have to be introduced at a point to maintain the voltage constant for a real power change of 55MW?
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- Discuss the concept of reactive power and its role in grid stability.2) The one-line diagram of a three-phase power system is as shown in Figure. Impedance are marked in per-unit on a 100-MVA, 400-kV base. The load at bus 2 is S2=15.93 MW - j33.4 Mvar, and at bus 3 is S3-77 MW + j14 Mvar. It is required to hold the voltage at bus 3 at ...L0 kV. Working in per-unit, determine the voltage at buses 2 and 1. (Please determine the voltage magnitude within the specified limits: 410-450 V. By considering the voltage magnitude value you determined yourself, solve the question.) V₁ j0.5 pu V₂ j0.4 pu S₂ Figure V3 S3For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ??.and ??Find the value of the maximum average power transferred to ? (Can you write the steps in detail in sentences?)
- A surge of 100 kV travels along an overhead line towards its junction with a cable. The surge impedance for the overhead line and cable are 400 ohms and 50 ohms respectively. The magnitude of the surge transmitted through the cable is ?In the context of power quality, what are common issues like voltage sags, swells, harmonics, and transients? How can these issues be mitigated or corrected in a power system?For the maximum average power transfer in the circuit shown in Figure 2, use the impedance ZLand ZLFind the value of the maximum average power transferred to ? (Can you write the steps in detail in sentences?)
- What are FACTS (Flexible Alternating Current Transmission Systems) devices, and how do they enhance the control and stability of power systems?The steady-state voltage drop between the load and the sending end of the line seen in (Figure 1) is excessive Suppose that V-4950/0° V (rms). A capacitor is placed in parallel with the 192 kVA load and is adjusted until the steady-state voltage at the sending end of the line has the same magnitude as the voltage at the load end, that is, 4950 V (rms). The 192 kVA load is operating at a power factor of 0.8 lag. Part A Calculate the size of the capacitor in microfarads if the circuit is operating at 60 Hz. In selecting the capacitance, use the value that results in the lowest possible power loss in the line. Express your answer in microfarads to three significant figures. ▸ View Available Hint(s) Figure 1 of 1 202 1100 192 kVA 0.8 lag ΜΕ ΑΣΦ. 11 vec C= 22.8 Submit Previous Answers Incorrect; Try Again; 5 attempts remaining Provide Feedback ? FA 60Hz sourcewith an effective voltage of 240 volts supplies 4500 volt-amp to a load with a p.f. of 0.75 lagging. Determine the parallel capacitance required to improve the power factor to: a) 0.9 lagging and b) 0.9 leading. What per cent reduction in line current resulted in part (a)?
- Explain the concept of FACTS (Flexible Alternating Current Transmission Systems) devices. How do they enhance the control and stability of power systems? Provide examples of FACTS devices and their applications.Can ripple factors be grater then unity . Justify?Two alternators rated 400 MW and 600 MW are operating in parallel. The droopcharacteristics of their governors are 3% and 4% respectively from no loadto full load. Assuming that the alternators are operating at 50 Hz at noload, how would a load of 1000 MW be shared between them? What will be thesystem frequency at this load?