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POWER SYSTEMS

Power Systems
Two generating stations delivering a powers of P1 = 150 MW, P2 =100 MW and the B coefficients are B11 = 0.005, B22 = 0.002, B12=B21= -0.001. Find the transmission line losses?

 95.5
 105.2
 85.5
 102.5

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Power Systems
Incremental cost of two generators Ic1 = 0.2 P1+60, Ic2 = 0.3 P2+40 and the ratings of the generator are 150 and 250 MW. Find the load sharing of each generator for a load of 200 MW?

 P1 = 60 MW, P2 = 140 MW
 P1 = 80 MW, P2 = 120 MW
 P1 = 100 MW, P2 = 100 MW
 P1 = 120 MW, P2 = 80 MW

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Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 250
 900
 500
 450

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Power Systems
A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support buses and 15 buses are ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson Jacobian matrix is

 553×553
 554×554
 555×555
 540×540

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Power Systems
The Gauss Seidel load flow method has following disadvantages. Which of the following statement is wrong?

 Slow convergence
 A good initial guess for voltages is essential for convergence
 Unreliable convergence
 Choice of slack bus affects the convergence

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