Q6) A three-phase synchronous generator 4.6-KV and 500-KVA and 60-HZ and 4 poles with star connection Has synchronous reactance Xc=1. 25pu The relationship between output voltage and generator excitation current is Ea = If / 7.5 pu and the nominal excitation current is 15 A and the generator with infinite grid is 4.6-KV synchronous. A) Measurements show that the armature current and the excitation current are approximately at their nominal values. Draw the phasor diagram accurately and calculate the active reactive power exchanged in the network B) If the active power exchanged in the previous two parts is assumed to be infinite, then the excitation current is reduced to 80% of the nominal value. Draw the new phasor diagram on the previous phase phasor diagram and calculate the armature current and the reactive power factor. C) In part (b) at most what percentage can we reduce the excitation current without the machine going out of sync mode?
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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