Suppose two generators supplying a load. Generator-1 has a no-load frequency of 61.5 Hz and a slope sp1 of 1 MW/Hz. Generator-2 has a no-load frequency of 62 Hz and a slope sp2 of 1MW/Hz. The two generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. Draw the resulting system power-frequency or house-diagrams. Determine (a) at what frequency is the system operating, and how much power is supplied by each of the generators? (b) if an additional 0.75-MW load were attached to this power system. What would the new system frequency be, and how much power would the each generator supply now? (c) with the system in the configuration described in part (b), what will the system frequency and generators power be if the governor set points on generator-1 are increased by 0.5 Hz?
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.
Suppose two generators supplying a load. Generator-1 has a no-load frequency of 61.5 Hz and a slope
sp1 of 1 MW/Hz. Generator-2 has a no-load frequency of 62 Hz and a slope sp2 of 1MW/Hz. The two
generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. Draw the resulting system
power-frequency or house-diagrams. Determine (a) at what frequency is the system operating, and
how much power is supplied by each of the generators? (b) if an additional 0.75-MW load were
attached to this power system. What would the new system frequency be, and how much power
would the each generator supply now? (c) with the system in the configuration described in part (b),
what will the system frequency and generators power be if the governor set points on generator-1 are
increased by 0.5 Hz?
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