Please solve Q6.9(b) and Q6.10

6.9 For the sample system of Example 6.4 with bus 1 as slack, use the following methods to obtain a load flow solution. (a) Gauss-Seidel using YBUS, with acceleration factor of 1.6 and tolerances of 0.0001 for the real and imaginary components of voltage. (b) Newton-Raphson using Yous, with tolerances of 0.01 pu for changes in the real and reactive bus powers. Note: This problem requires the use of the digital computer. 6.10 Perform a load flow study for the system of Problem 6.4. The bus power and voltage specifications are given in Table P-6.10. Table P-6.10 Bus power, pu Bus Voltage magnitude, pu Bus type Real Reactive 1 2 3 4 Unspecified 0.95 - 2.0 - 1.0 Unspecified Unspecified - 1.0 - 0.2 1.02 1.01 Unspecified Unspecified Slack PV PQ Compute the unspecified bus voltages, all bus powers and all line flows. Assume unlimited Q sources. Use the NR method. 6.4 (a) Find the bus incidence matrix A for the four-bus system in Fig. P-6.4. Take ground as a reference. (b) Find the primitive admittance matrix for the system. It is given that all the lines are characterized by a series impedance of 0.1 + j0.7 12/km and a shunt admittance of j0.35 x 10-9 W/km. Lines are rated at 220 kV. (c) Find the bus admittance matrix for the system. Use the base values 220 kV and 100 MVA. Express all impedances and admittances in per unit. 100 km 2 110 km 150 km 100 km 3 120 km 4 Fig. P-6.4