6.2. A power system network is shown in Figure 6.18. The values marked are impedances in per unit on a base of 100 MVA. The currents entering buses I and 2 are I₁ =1.38j2.72 pu I2 0.69 1.36 pu (a) Determine the bus admittance matrix by inspection. (b) Use the function Y = ybus(zdata) to obtain the bus admittance matrix. The function argument zdata is a matrix containing the line bus numbers, resistance and reactance. (See Example 6.1.) Write the necessary MATLAB commands to obtain the bus voltages. In j0.5 j1.03 0.02 + j0.04 2 0.01+j0.03 0.0125+j0.025 3 FIGURE 6.18 One-line diagram for Problem 6.2. 0.4+ j0.2 12