PVstation8.6 Consider the microgrid given in Figure 8.56.The positive sequence impedance of the transmission lines is given inthe one-line diagram (Figure 8.56). The system data are as follows:PV generating station: 2 MW, 460 V AC; positive, negative, and zerosequence impedance of each line is equal to 10%. The gas turbine gen-erating station is rated at 10 MVA, 3.2 kV, with positive sequence reac-tance of 10%. The generator negative sequence impedance is equal tothe positive sequence, and the zero sequence impedance is equal to half(1/2) of the positive sequence impedance. Transformers' positivesequence impedance is equal to the negative sequence and equal tothe zero sequence impedance.DC/AC3CBT₁AC PV bus YA61+/1020CBCBCBm0.5+15личи5AS52Gasturbine0.3+167 wwNALocalS6STutilityFigure 8.56 A one-line diagram for Problem 8.6.

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Answered: PV station 8.6 Consider the microgrid…

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter8: Symmetrical Components

Section: Chapter Questions

Problem 8.23P

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Example 8.4 The one line diagram of a simple three-bus power system is shown in the figure. Each generator is j0.1 j0.2 represented by an emf behind the transient reactance. All impedances are expressed in per unit j0.1 j0.2 in a common 100 MVA base, and for simplicity, j0.8 resistances are neglected. The following assumption 2 are made: j0.4 j0.4 •shunt capacitances are neglected and the system is considered on no load. •all generators are running at their rated voltage 3 and rated frequency with their emf in phase Determine the fault current, the bus voltages and the line currents during the fault when a balanced three-phase fault with a fault impedance Z; = j0.16 %3D p.u. fault occurs on bus 3
Three zones of a single-phase circuit are identified shown in Figure below. The zones are connected by transformers T1 and T2, whose ratings are also shown. Using base values of 33 kVA and 232 volts in zone 1, Find: 1- Draw the per-unit circuit including the per-unit impedances and the per-unit source voltage. 2- Calculate the load current both in per-unit and in amperes (actual or original value). Vs Zone 1 232.940° Vs G. 38 T₁ 30 KVA 240/480 volts Xeq = 0.10 p.u. Zone 2 Xiine = 4 Ω T₂ 20 KVA 460/115 volts Zload = Xea = 0.10 p.u. Zone 3 u 1+j2.2 Ω 2
In the above figure, a single line model of a three-phase power system is given. Base power 50MVA, base voltage 13.8kV according to its value, a) Per-unit values of power system circuit elements according to the given base power and base voltage values. calculate. b) The perunit you calculate by drawing the equivalent impedance circuit for one phase of the power system given in the figure. show on the values.
The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of an unloaded synchronous machine decreases from a high initial value to a lower steady-state value, going periods through the stages of __________ and ________ periods.
Three single-phase transformers, each rated 10 MVA , 66.4/12.5 kV, 60 Hz , with an equivalent series reactance of 0.1 per unit divided equally between primary and secondary, are connected in a three-phase bank. The high-voltage windings are Y-connected and their terminals are directly connected to a 115-kV three-phase bus. The secondary terminals are all shorted together. Find the currents entering the high-voltage terminals and leaving the low-voltage terminals if the low-voltage windings are (a) Y-connected and (b) Δ- connected.
In power distribution systems, what is sometimes necessary to install to reduce harmonic frequencies and distortion between the three-phase transformers and distribution panels?
Subject - Design electrical circuits for single-phase AC networks Question - Compare the effect of varying resistance, capacitance and inductance in parallel and series AC circuits on voltage, resistance and impedance
Subject - Design electrical circuits for single phase AC networks Question - Compare the effect of varying resistance, capacitance and inductance in a pararllel and series AC circuits on voltage resistance and impedance.
6. For a three bus power system assume bus 1 is the swing with a per unit voltage of 1.020 , bus 2 is a PQ bus with a per unit load of 2.0 + j0:5, and bus 3 is a PV bus with 1.0 per unit generation and a 1.0 voltage setpoint. The per unit line impedances are j0.1 between buses 1 and 2, j0.4 between buses 1 and 3, and j0.2 between buses 2 and 3. Using a flat start, use the Newton-Raphson approach to determine the first iteration phasor voltages at buses 2 and 3.
Power system protection
Three single-phase two-winding transformers, each rated 400 MVA, 13.8/ 199.2 kV, with leakagereactance Xeq = 0.10 per unit, are connected to form a three-phase bank. Winding resistances andexciting current are neglected. The high-voltage windings are connected in Y. A three-phase loadoperating under balanced positive-sequence conditions on the high-voltage side absorbs 1000 MVA at0.90 p.f. lagging, with VAN = 199.2 ∠00 kV. Determine the voltage Van at the low-voltage bus if the lowvoltage windings are connecteda) in Y,b)
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.

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