Elements of Electrical Power Station Design-M.v Deshpande. May 9, | Author: Imtiaz Aziz | Category: N/A. DOWNLOAD PDF - MB. Share Embed. Elements of. Electrical Power Station Design. M.V. DESHPANDE. Formerly Professor & Head. Department of Electrical Engineering. L.D. College of Engineering. download Elements Of Electrical Power Station Design by Deshpande MV PDF Online. ISBN from PHI Learning. Download Free Sample and Get.
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Elements of Electrical Power Station Design-M.v Deshpande - Ebook download as PDF File .pdf) or read book online. book. ELECTRICAL. POWER STATION. DESIGN. M. V. DESHPANDE. Am MHD systems. Chapter 6 Elements of nuclear power stations. Field of use. Rev 1 10 Dec Elements of Electrical Power Station Design. M.V. Deshpande. Chapter 8. Example Problem Page At a site for hydro- electric power.
The terminal voltage will increase with the capacitance, but it is limited by the iron saturation. Since the induction generator is actually an induction motor being driven by a prime-mover, it has several advantages when is compared with the synchronous generator as: It is less expensive and more readily available than a synchronous generator. It does not require a D. Its control is simpler and less expensive. It is robustand brushless construction.
It is ruggedness, ease of maintenance, absence of D. It is better transient performance, self — protection against short — circuits and large over — load. It operates as autonomous generator from a renewable energy source such as hydro-turbine to supply for ordinary growing energy demand loads in mainly rural areas owing to many economically advantages. For self-excitation to be occurs, the following conditions must be satisfied: The rotor of the machine should have sufficient residual magnetism.
The 3-phase capacitor bank should be of a sufficient value.
The minimum capacitance value. A precise calculation of the capacitance required to generate a given voltage under a specific load is only possible with knowledge of the electrical parameters of the induction machine in question.
These parameters can be obtained by means of a number of standard tests. In practice it is sufficient to calculate an approximate value of excitation capacitance and adjust the hydro turbine speed until the required system voltage is obtained.
This will mean that the operating frequency may differ from the rated frequency of the induction machine, which is acceptable provided that the frequency is kept within reasonable limits. Results The design procedure of micro-hydro-electric power plant was implemented by Matlab Simulink computer program. After introducing the site measurements and calculations as input data to the computer program, the weir dimensions, open channel dimensions, penstock dimensions, turbine type, turbine size, turbine power, turbine speed, turbine efficiency, generator specifications and gear box ratio were determined.
Figures 3,4 show the relation between turbine power and speed with gross head at different values of water flow rate. Figures 5,6 show the variation of turbine power and speed with water flow rate at different values of site head.
From these results, the turbine power and speed were directly proportional with the gross head but, there were specific points for maximum power and maximum speed in case of water flow variation. Figures 7,8 show the variation of head loss with the gross head and water flow rate. It can be shown that the head loss was increased very high with increasing the water flow rate than that with increasing the gross head.
Figure 9 shows the variation of turbine type, turbine power and turbine dimensions with head at different values of water flow rate. The Cross-Flow turbine was used for low head and low flow rate up to- 0.
Figure 10 shows the variation of turbine power with head for Pelton turbine. Pelton turbine was used for high head and very low flow rate. Figure 11 shows the variation of generator power with generator diameter at different values of speed.
It can be shown that the generator —stator diameter was inversely proportional with the generator speed. Conclusions and Outcomes I- Micro-hydro power continues to grow around the world, it is important to show the public how feasible micro-hydro systems actually are in a suitable site.
The only requirements for micro-hydro power are water sources, turbines, generators, proper design and installation, which not only helps each individual person but also helps the world and environment as a whole.
II-Run-of-river micro-hydro turbine schemes generate electricity when the water is available and provided by the river. When the river dries-up and the flow falls below predetermined amount or the minimum technical flow for the turbine, generation will cease.
III- Medium and high head schemes use Weirs to divert water to the intake. It is then conveyed to the turbines via a pressure pipe or penstock. Penstocks are expensive and the design is usually uneconomic due to the high penstock friction head loss. The head losses in the penstock could range from 5 to 10 percent of the gross head, depending on the length of the penstock, quantity of water flow rate and its velocity. An alternative is to convey the water by a low-slope canal, running a long side the river to the pressure intake or fore-bay and then in a short penstock to the turbine.
IV- The choice of turbine will depend mainly on the pressure head available and the water flow rate. There are two basic modes of operation for hydro power turbines: Impulse and reaction.
Impulse turbines are driven by a jet of water and they are suitable for high heads and low flow rates. Reaction turbines run filled with water and use both angular and linear momentum of the flowing water to run the rotor and they are used for medium and low heads and high flow rate.
V- The turbine power and speed were directly proportional with the site head, but there were specific points for maximum turbine power and speed with the variation of the site water flow rate.
VI- Regulated turbines can move their inlet guide vanes or runner blades in order to increase or reduce the amount of flow they draw.
Cross-flow turbines are considered best for micro-hydro projects with a head of 5 meters or less and water flow rate 1.
VII- Micro-hydro power installations are usually run-of-river systems, which do not require a dam, and are installed on the water flow available on a year round basis. An intake structure with trash rack channels water via a pipe Penstock or conduit down to a turbine before the water released downstream.
In a high head greater than 50 m and low water flow lessthan For low heads and up to 50 m , also the cross-flow impulse turbine can be used. IX- The cross-flow turbine is suitable for installing small hydro-electric power plants in case of low head and flow rate.
A complete design of such turbines has been presented in this paper. The complete design parameters such as runner diameter, runner length,water-jet thickness, blade spacingradius of blade curvature, turbinepower,turbinespeed and number ofbladeswere determinedat maximumturbineefficiency.
X-The speed of a hydro — electric generator depends on the speed of the turbine driving it, which in turn depends on the specific speed of the particular type of turbine. Thus, there is a limitation in the choice of speed in addition to the frequency requirement.
They are typically shaped like a disk large diameter and small axial or stator core length. From the electrical view point, slow- speed machines are considered to have lower internal reactance, high short circuit currents, small angular change in rotor position can cause large power swings and requiring good protection against faults occurring near the machineterminals.
Due to a difficult in manufacturing low speed synchronous generator to be used in the project site, the standard V, 8-poles,50 Hz, r.
References . Bryan, R. Khurana, S. Wazed, M.
Basarab Guzun , and et. Felix Mtalo , and et. Vineesh, V. Loice ,G. Sadrul Islam, A. Mockmore, C. Razak, J. Harvey, A. Pandey, V. Diesel-electric Stations: Preliminary Design 4.
Steam Stations: Preliminary Design 5. Gas Turbine Stations and Combined Cycles 6. Elements of Nuclear Power Stations 7. Hydro-electric Stations: Preliminary Design-I 8. Preliminary Design-II 9. Combination of Hydro-electric and Steam Stations Major Electrical Plant in Power Stations Power Stations Control and Interconnection This single location in All: University of Sydney Library.
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