2. Consider the single-line diagram of a three-phase power system shown below. T2 (50 + j200) 2 (G2 (25+j100) Q|(25+j100) 2 i Load Generator G1 : 50 MVA, 13.2 kV, X = 0.15 p.u. Generator G2 : 20 MVA, 13.8 kV, X = 0.15 p.u. A-Y transformer T1 80 MVA, 13.2 /165 kV, X = 0.1 p.u. : Y-A transformer T2 40 MVA, 165 /13.8 kV, X = 0.1 p.u. : Load 40 MVA, 0.8 PF lagging, operating at 150 kV Choose a base of 100 MVA for the system and 132-kV base in the transmission-line circuit. Let the load be modeled as a parallel combination of resistance and inductance. Neglect transformer phase shifts. Draw a per-phase equivalent circuit of the system showing all impedances in per unit. Calculate the current drawn from generator 1 and 2.
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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