Q.5. (E3 10) State True or false a- The DC load flow study is an iterative process b- In a load frequency control, a generator unit equipped with a governor can be assumed to be a controlled unit. c- In order to keep a constant frequency in a power system the following relation has to be satisfied: E Peneration = E PLoad +EPiosses d- The direction of the active power flow is from the bus with a high voltage magnitude to the bus with a less voltage magnitude.
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Q: Discuss any two methods for power factor improvement.
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- State True or false e-In a multi area power system, the objective of a load frequency control is to maintain a constantfrequency f- Reduction of the droop characteristics R reduces the static frequency error. g-The area frequency response characteristic is inversely proportional to the droop characteristic.The impedance of the 500 km long transmission line is Z = 0.1 + j * 0.4 ohm / km. At the end of the line, 988.1 A current is drawn under 400 kV interphase voltage. The angle of the current is -68. It is 6 degrees. With the short transmission line equations, the amplitude value of the phase neutral value of the busbar voltage to which the generator at the beginning of the line is connected is given correctly. A) 231.34 B) 52.35 C) 400 D) 380.28 E) 388.57S.2) The serial impedance of the 300 km power transmission line is 23 + j75 ohm / phase and the shunt acceptance is j500 microS / phase. A power of 50 MW with a power factor of 0.88 under 220 kV interphase voltage from the end of the power transmission line being shot. Using these data of the energy transmission line, a) Characteristic impedance of the energy transmission line, b) Natural apparent power of the energy transmission line according to the 220 kV interphase operating voltage, c) The values of the line parameters A, B, C and D of the transmission line using hyperbolic functions, d) Calculate the maximum power that the power transmission line can transmit.
- The load flow data for the sample power system are given below. The voltage magnitude at bus 2 is to be maintained at 1.04 p.u.Determine the set of load flow equations at the end of first iteration by using N-R method. Impedance for sample system Bus Code Impedances line charging admittance 1-2 0.08 + j0.24 0.0 1-3 0.02 + j0.06 0.0 2-3 0.06 + j0.18 0.0 Schedule of generation and loads: Bus Code Assured Voltages Generation Load…In an energy transmission system with a power value of 100 MVA and a power coefficient of 0.8 reverse (inductive), the generator in a hydroelectric power plant was operated as an over-excited synchronous motor for grid power compensation and was connected to this system as a capacitive load of approximately 40 MVAR. Show the active, reactive and apparent powers on the phasor diagram (power triangle) and calculate the new power factor after the synchronous capacitor is connected.Shown are two buses connected via a transmission line. Connected to Bus 1 is a generator(modelled as a voltage source V1), and to Bus 2 is a generator( with Voltage V2) and a load. The line impedance Z = R + jX is not known. Three-phase load is forecasted as 100MW + 60MVar. Generator at Bus 2 is scheduled to deliver 40MW and its excitation is adjusted for the machine to deliver 55 MVar. Voltage at Bus 1 is 241 KV angle 10 deg, while voltage at bus is 230 kV; use V2 as the reference for all angles. 1. What is the current (RMS) in amperes drawn by the load connected to Bus 2? 2. How much real power (in MW) is delivered by the generator connected to Bus 1? 3. What is the total real power loss along the line, in percent of the load? 4. What is the X/R Ratio of the line impedance?
- It is desired to purchase a synchronous condenser to correct the 2,400-KVA 0.67-lagging power factor load in an industrial plant to 0.95 lagging. Neglect losses, calculate: (a) the kilovolt-ampere input rating of the required synchronous condenser; (b) the total kilovoltamperes of the plant. Using the phasor diagram.4 Sinusoidal voltage source of us(t) = [100 cos ωt]V , (ω = 20Mrad s ) voltage is connected to the input of a transmission line of h = 10m length. The wawe parameters of the line and the impedance of the loading two-pole connected to the output at ω angular frequency are: Z0 = (49, 5 - j2)Ω, γ = (0, 5 + j40)km-1, and Z2 = Z0. Find the voltage amplitude at the nearest point to the source where the voltage phase angle is 0! a) U = 100V b) U = 92, 4V c) U = 36, 8V d) U = 50VA Z0 = 50 Ω transmission line of length l = 4.25 m (with dielectric material with parameters εr= 4, µr = 1) is attached to a time-harmonic generator (V0rms = 30 V, Rg = 20 Ωf = 75 MHz). The line is terminated with a load ZL = 100 + j50 Ω.Write Matlab (or similar high level language) code to find the complex instantaneous voltagesand currents along the line and time averaged losses in the load and generator. Use this codeto make a movie of the instantaneous total voltage and current along the line, and plot thecomplex voltage and current for the line in the following two cases:a) Assume the line is losslessb) Assume the line has a small loss equivalent to R’ = 1.2 Ω/m please solve part b
- A ower system is operating at 1000Mw, 132kV, 50Hz, with 0.8 p.f. laging in parallelwith another line at 750OMW, 132kV, 50Hz with 0.707 p.f. lagging. Both are interconnectedat the station and when the compensating device is on, the overall power factor isimproved to 0.9 lagging. Suggest suitable capacitors, shunt and series. Individual loadsand combined load are to improve power factor to 0.9 in all cases.Consider a 3-phase delta induction motor that is operating at 120 Hz. The motor (load) impedance, Z_Δ is given as (9+j12)Ω. The line-to-line voltage at the load is, ?_ab=416 ∠30ºVrms. Let the source be wye-connected, and line impedance be negligible. a) Draw the single-phase wye equivalent circuit and label all known parameters numericallyincluding load voltage. b)Determine the rms phase current phasors for each phase. c) Calculate the complex power consumed by the 3-phase load. d) Determine the capacitance value of each capacitor in a 3-phase delta capacitor bank needed to correct the load to a power-factor of 0.9, lagging.1/In the Transmission Line Simulator, the Transmission Line is connected in Nominal-Pi Circuit. Select one: True False