Q.6: A (500 MW) synchronous generator is delivering (100 Mw) to infinite bus through the unit transformer and double transmission lines. If the steady state stability for each line is (150 MW), assess the system stability for sudden large change in load?
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- Description The single line diagram of figure below shows a generator connected through parallel transmission line to a large metropolitan system considered as an infinite bus. The machine is delivering 1.0 per-unit power and both the terminal voltage and the infinite-bus voltage are 1.0 per unit. Numbers of the diagram indicate the values of the reactances on a common system base. The transient reactance of the generator is 0.2x per unit as indicated. Determine the power-angle equation for the given system operating conditions. When a three-phase fault occurs at point P, and the fault on the system is cleared by simultaneous opening of the circuit breakers at each end of the affected line, determine the power angle equation and the swing equation for the during fault and post-fault period. Take H= 5.5Q Mj/MVA. (Roll=PQXY) j0.5, j0.1y O X = 0.2X P j0. 5,-The sum of the armature reactance and.............reactance is the reactance of the synchronous generator after the short circuit fault is cleared. -The selection of number of generating sources to meet the expected load is called as economic dispatch. Select one: True FalseWhich of the following is true in the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of the round pole synchronous generator a) Due to the voltage Efd, the excitation current is large in capacitive operation and small in ohmic operation b) Due to the voltage Efd, the excitation current is large in ohmic operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation. d) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation.
- The one-line diagram of a simple power system is shown in Figure below. The neutral of each generator is grounded through a current-limiting reactor of 0.25/3 per unit on a 100-MVA base. The system data expressed in per unit on a common 100-MVA base is tabulated below. The generators are running on no-load at their rated voltage and rated frequency with their emfs in phase. G Stark Item Base MVA Voltage Rating X' x² 20 kV 20 kV 20/220 kV 20/220 kV 100 0.05 0.15 0.15 0.10 0.10 220 kV 0.125 0.125 0.30 0.15 0.25 025 0.7125 0.15 100 100 0.15 0.05 0.10 0.10 0.10 100 0.10 100 100 Lu La 220 kV 0.15 220 kV 0.35 100 A balanced three-phase fault at bus 3 through a fault impedance Zf= jo.I per unit. The magnitude of the fault current in amperes in phase b for this fault is: Select one: A. 345.3 B. 820.1 C. 312500 3888888 产产State True or false a- The DC load flow study is a linear analysis b- In a load frequency control, a generator unit equipped with a governor can be assumed to be a controlled unit.A network consisting of a set of generator and load buses is to be modeled with a DC power flow, for the sake of conducting a contingency analysis. The initial flows calculated with the DC power flow give the following information: f°2-4 = - 65.3 MW and fº4-5 = 13.6 MW. The following values of LODF and PTDF factors are given: PTDF54,2-4 = -0.2609, LODF2-4,4-5 = -0.6087. Calculate the contingency flow on line 2-4 due to outage of line 4-5. Select one: O a. -75.5MW O b. None of these O c. -68.85MW O d. -73.58MW O e. 75.5MW O f. -61.75MW
- A DC Optimal Power Flow problem is to be solved for a 3-bus network. The per-unit reactances of the lines interconnecting the buses are as follows: X12 = 0.1pu, X13 = 0.12 pu and X23 = 0.2 pu. There is a generator at each bus. The loads at buses 1, 2 and 3 are 150MW, 200mw, and 100MWrespectively. Bus 1 is taken as the reference bus, and SBase = 100 MVA. Which one of the below is a constraint of the DCOPF problem? Select one: O a. None of these O b. -500 0₂-1000 03 = P3 - 110 O c. 1500 0₂-500 03 = P₂ - 220 O d. 1500 0₂-500 03 = P₂ - 200 O e. -500 0₂-1000 03 = P3 - 150 O f. -1500 8₁-1000 03 = P₁ - 150Sketch the complete per-phase equivalent circuit of a symmetrical non-salient pole three-phase synchronous generator, including the field winding circuit. Your figure should include the synchronous reactance Xs, explain its relation to Xar and Xl. In addition, explain/describe the rest of the different elements of this equivalent circuit.A 60-Hz synchronous generator having inertia constant H = 6 MJ /MVA and a direct axis transient reactance X'd = 0.3 per unit is connected to an infinite bus through a purely reactive circuit as shown in Figure below. Reactances are marked on the diagram on a common system base. The generator is delivering real power Pe = 0.75 per unit and Q = 0.06 per unit to the infinite bus at a voltage of V = 1 per unit. A temporary three-phase fault occurs at the sending end of the line at point F. When the fault is cleared, both lines are intact. Determine the critical clearing angle (in radian) and the critical fault clearing time (in second). 1 Xt = 0.2 E X'd = 0.3 Select one: O a. Sc=1.75, tc= 0.36 Ob. 8c-1.15, tc= 0.25 O c. None O d. 8c=1.55, tc= 0.3 Clear my choice XL1 = 0.3 XL2 = 0.3 2 V = 1.0
- Discuss system demand and generator loadingProblem 2 Two shunt generators A and B operate in parallel and their load characteristics maybe taken as straight lines. The voltage falls from 240V at no load to 200V at200A, while that of B falls from 245V at no load to 220V at 150A. Determine the bus bar voltage when supplying 66.9KW load. How is the load divided between two generators?What is the need to conduct power flow analysis? Discuss about data needed and bus types too.