A 350 MVA, 11 kV three-phase generator has a sub transient reactance of 15%. The generator supplies a number of synchronous motors over 64-km transmission line having transformers at both ends, as shown in Figure B3. M1 m M2 Figure B3 Just two equivalent motors represent the motors, all rated 13.2 kV. Rated inputs to the motors are 100 MVA and 50 MVA for M1 and M2, respectively. For both motors X" = 12%. The three-phase transformer TI is rated 200 MVA, 11/220kV with leakage reactance of 10%. Transformer T2 is composed of three single-phase transformers each rated 220/13.2 kV, 180 MVA with leakage reactance of 12%. Series reactance of the transmission line is 0.5+j0.5 D/km. Draw the impedance diagram, with all reactance marked in per-unit. (Select the generator rating as base in the generator circuit) ute-
Load flow analysis
Load flow analysis is a study or numerical calculation of the power flow of power in steady-state conditions in any electrical system. It is used to determine the flow of power (real and reactive), voltage, or current in a system under any load conditions.
Nodal Matrix
The nodal matrix or simply known as admittance matrix, generally in engineering term it is called Y Matrix or Y bus, since it involve matrices so it is also referred as a n into n order matrix that represents a power system with n number of buses. It shows the buses' nodal admittance in a power system. The Y matrix is rather sparse in actual systems with thousands of buses. In the power system the transmission cables connect each bus to only a few other buses. Also the important data that one needs for have a power flow study is the Y Matrix.
Types of Buses
A bus is a type of system of communication that transfers data between the components inside a computer or between two or more computers. With multiple hardware connections, the earlier buses were parallel electrical wires but the term "bus" is now used for any type of physical arrangement which provides the same type of logical functions similar to the parallel electrical bus. Both parallel and bit connections are used by modern buses. They can be wired either electrical parallel or daisy chain topology or are connected by hubs which are switched same as in the case of Universal Serial Bus or USB.
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