Q1- Consider a small hydro scheme with a head of 60 m and a flow rate of 5 m³/s. If the efficiencies of the main components at rated output are penstock efficiency: 0.88 turbine efficiency: 0.78 generator efficiency: 0.95. The generator to be used is a 24 pole synchronous generator operating at 60Hz, and the reservoir supplying the scheme has a useable storage capacity of 800,000 m³. a) Calculate the normal speed and the electrical output. b) How much electrical energy can be generated without the reservoir being replenished? Ignore the effect of changes in the depth of the reservoir c) Calculate the specific speed d) which type of turbine is suitable for this hydro power scheme
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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