Consider An Example Of Four Bus Systems As Shown In Figure 1 Generators Are Connected To The Buses And While The Load I 1 (85.48 KiB) Viewed 39 times
Consider An Example Of Four Bus Systems As Shown In Figure 1 Generators Are Connected To The Buses And While The Load I 2 (46.98 KiB) Viewed 39 times
Consider an example of four-bus systems as shown in Figure 1. Generators are connected to the buses and while the load is connected to all four buses. The base values for the transmission system are 100 MVA, 230 kV. The line data in Table 1 are presented as per unit serial impedances and half-line charge admittances for the transmission lines. L2 2 LL 3 4 LA G4 Figure 1: Example of a 4-bus system From bus- to bus Impedance Z (pu) Half-line charge admittances 10,05125 1 - 2 0,01008 + 0,05040 1-3 0,00744 +10,03720 10,03875 2-4 0,00744 +0,03720 10,03875 3-4 0,01272 +0,06360 10,06375 Table 1: Line data for figure 1 Note: Pi line model of the transmission lines is used. The admission corresponding to half of the operating capacity of each of the transmission lines is given in Table 1. a) Get the elements of the Ybus - matrix by inspection. Write the results in rectangular coordinates. Write out all equations (Y11... Y44), not just the results! b) Generation and load data corresponding to figure 1 are given in table 2. If bus 1 is selected as Slack bus, classify buses 2, 3 and 4 as P-Q or P-V. Explain the basis of your classification. Note: Index 'L' corresponds to load, while 'G' corresponds to the generator
Bus Generation QGI MW MVAR PG Load Pli MW Qli MVAR 30,99 1 ? ? 50 1,00 20° 2 0 0 170 105,35 Unknown 3 0 0 200 123,94 Unknown Magnitude is 4 1.02 318 ? 80 49,58 Angle is unknown Table 2: Generation and load data for figure 1 Partial answer check: Y22 = +(8,985190 - 144,83593)
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