Q4. A synchronous generator with a synchronous reactance of 1.5 p.u. is connected to an infinite bus whose voltage is 1 p.u. The maximum permissible power output is 1.2 p.u. (a) Compute the excitation voltage. (b) The power output is gradually reduced to 0.7 p.u. with fixed field excitation. Find the new current and power angle δ. Q5. Compute the reactive power generated by the machine of problem Q4 under part (b). If the machine is required to generate a reactive power of 0.4 p.u. while supplying the same active power by changing the field excitation, find the new excitation voltage and power angle δ.
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.
Q4. A synchronous generator with a synchronous reactance of 1.5 p.u. is connected to an
infinite bus whose voltage is 1 p.u. The maximum permissible power output is 1.2 p.u. (a)
Compute the excitation voltage. (b) The power output is gradually reduced to 0.7 p.u. with fixed
field excitation. Find the new current and power angle δ.
Q5. Compute the reactive power generated by the machine of problem Q4 under part (b). If the
machine is required to generate a reactive power of 0.4 p.u. while supplying the same active
power by changing the field excitation, find the new excitation voltage and power angle δ.
answer Q5
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