CVE 471 WATER RESOURCES ENGINEERING HYDROELECTRIC POWER. Assist. Prof. Dr. Bertuğ Akıntuğ
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1 CVE 471 WATER RESOURCES ENGINEERING HYDROELECTRIC POWER Assist. Prof. Dr. Bertuğ Akıntuğ Civil Engineering Program Middle East Technical University Northern Cyprus Campus CVE 471 Water Resources Engineering 1/28
2 Overview Characteristics of Electrical Power Plants Terminology Hydroelectric Power Plants Run-of-River Plants Storage Plants Pumped-Storage Plants Components of Hydroelectric Power Plants Availability of Hydroelectric Power and Energy Flow Duration Method Sequential Streamflow Routing Method CVE 471 Water Resources Engineering 2/28
3 Characteristics of Electric Power Plants Electricity is commonly generated in Hydropower Plants, Thermal Plants, and Nuclear Plants. Hydropower plants generate electricity by water turbines which operates by means of falling water. Thermal plants generate electricity by steam turbines, which require fossil fuel (coal, oil, or natural gas). Nuclear power plants use an atomic fuel like uranium, thorium, and plutonium. Alternative sources: Wind energy, Solar energy, and Wave energy. CVE 471 Water Resources Engineering 3/28
4 Characteristics of Electric Power Plants The process of use of fuel converts 30 to 40% of energy content of the fuel to electrical energy. Operational scheme of thermal power plant: CVE 471 Water Resources Engineering 4/28
5 Characteristics of Electric Power Plants Initial cost of a hydroelectric plant is normally higher than that of a thermal plant producing almost the same amount of power. The maintenance and repair costs of a thermal plant are much higher than for a hydroelectric plant. Thermal plant needs one month of maintenance each year. Operation costs of thermal plant is also high because of high cost of fuel. The cost of hydro energy is approximately one-fifth of the cost of energy generated by fossil, and one-tenth of the cost of energy generated by nuclear plants. CVE 471 Water Resources Engineering 5/28
6 Characteristics of Electric Power Plants Hydroelectric plants put in operation in only a few minutes. relatively high efficiency (80 to 90%). lifetime is about 75 years. non-pollutant. Thermal plants needs a few hours for their startup. lifetime is about 25 years. may lead to environmental pollution if any air-pollution-control systems and cooling towers are not implemented. CVE 471 Water Resources Engineering 6/28
7 Characteristics of Electric Power Plants Nuclear power plants low efficiency (i.e. about 25%) annual maintenance and refueling period: two months excessive safety precautions should be taken against nuclear pollution Optimum use of combined system: The generation of base load by thermal or nuclear plants The generation of peak loads by hydroelectric plants. Worldwide: Thermal plants: ~75% Hydroelectric plants: ~23% Others: ~2% CVE 471 Water Resources Engineering 7/28
8 Characteristics of Electric Power Plants As of 2004, the annual energy generation in Turkey: Hydraulic: 21% Natural gas: 43% Fuel oil: 9% Lignite: 27% Geothermal and wind: <1% The present total installed capacity of all power plants in Turkey : ~29000 MW CVE 471 Water Resources Engineering 8/28
9 Characteristics of Electric Power Plants Above power plants generates almost 70% of hydroelectric energy in Turkey. CVE 471 Water Resources Engineering 9/28
10 Overview Characteristics of Electrical Power Plants Terminology Hydroelectric Power Plants Run-of-River Plants Storage Plants Pumped-Storage Plants Components of Hydroelectric Power Plants Availability of Hydroelectric Power and Energy Flow Duration Method Sequential Streamflow Routing Method CVE 471 Water Resources Engineering 10/28
11 Terminology The gross head, H g : The vertical difference between the water surface elevations at the upstream and downstream. The net effective head, H n : The head available for energy production. H n = H g - (head loss) Hydraulic efficiency, e h : The ratio of net head to gross head. Overall efficiency, e: e h x e t x e g e t : efficiency of turbines e g : efficiency of generators e is around 60-70% CVE 471 Water Resources Engineering 11/28
12 Terminology The capacity (installed capacity): The maximum power which can be developed by the generators. Firm (primary) power (base load): The power, which can be produced by a plant with no risk. For a single hydroelectric plant, it corresponds to the min. availability of storage. Firm energy is marketed with high price. Surplus (secondary) power: All the power available in excess of firm power. Secondary power cannot be relied upon. Its rate is usually less than that of firm power. It can be generated ~9 to 14 hours/day. Peaking load: The power required to meet peak demands. It can be generated for less than ~8 hours/day. CVE 471 Water Resources Engineering 12/28
13 Terminology Dump energy: The energy generated that cannot be stored and is beyond instantaneous needs. Usually sold at low price. The load curve: The variation of power requirement against time. Evening hours High demands Midnight Low demands Weekend Low demands Winter High demands The load duration curve: It gives the relation between the power generated and the corresponding time interval that can guarantee the generation of that power. CVE 471 Water Resources Engineering 13/28
14 Terminology Generally hydro and thermal plants operate together in an interconnected power distribution system. Hydroelectric power plants and thermal plants are utilized in a rotational manner by considering The quantity of water stored behind the reservoir, The future hydrometeorological conditions expected, and The availability of the fuel. In periods with plenty of water: Hydroelectric power plants are mainly used to generate base load in order to save fuel. In periods with low flow season: Thermal plants are used to produce the firm or base load. Combined system allows max. efficiency for optimum economic utilization. Load distribution CVE 471 Water Resources Engineering 14/28
15 Overview Characteristics of Electrical Power Plants Terminology Hydroelectric Power Plants Run-of-River Plants Storage Plants Pumped-Storage Plants Components of Hydroelectric Power Plants Availability of Hydroelectric Power and Energy Flow Duration Method Sequential Streamflow Routing Method CVE 471 Water Resources Engineering 15/28
16 Hydroelectric Power Plants Hydroelectric power plants are generally classified according to their operative mode, such as Run-of-river plant, Storage plant, and Pumped-storage plant. Run-of-River Plants Uses river flow with no storage Productivity depends on the river regime. Considered as base load plants CVE 471 Water Resources Engineering 16/28
17 Hydroelectric Power Plants Run-of-River Plants (con t) The flow is diverted from the river to the lined canal (min. slope for max. head). Settling basin is used to minimize the sediment entrainment into the canal. Some of the plants have regulating head water pond called forebay. Forebay facilitates daily or weekly storage to meet intermediate or peaking loads. Forebay also facilitates gentle approach flow conditions to intake, surge reduction, and sediment removal. A penstock transmits the flow to the power house. CVE 471 Water Resources Engineering 17/28
18 Hydroelectric Power Plants Storage Plants It has a reservoir of sufficient size to develop a firm flow substantially. Depending on the size of the storage, it can meet intermediate and peaking loads. Water is withdrawn from the reservoir by means of penstocks to the turbines for electricity generation. To obtain high head sometimes a power house is to be constructed at a sufficiently lower elevation on the other side of a hill. In this case water is diverted to the penstocks by pressure tunnels. CVE 471 Water Resources Engineering 18/28
19 Hydroelectric Power Plants Pumped-Storage Plants A pumped-storage plant incorporates a headwater and a tailwater pond jointly by a penstock and a reversible pump-turbine. During low demand hours: The hydraulic machine pumps water from the tailwater pond to the headwater pond using surplus power generated by a fuel-fired plant in the power system with relatively low cost. During peak hours: Water falls from the headwater pond by means of a penstock and passes through the turbine to generate electricity. Overall efficiency is ~70%. A reversible pump-turbine may operate up to ~300 m of heads with high efficiency. CVE 471 Water Resources Engineering 19/28
20 Overview Characteristics of Electrical Power Plants Terminology Hydroelectric Power Plants Run-of-River Plants Storage Plants Pumped-Storage Plants Components of Hydroelectric Power Plants Availability of Hydroelectric Power and Energy Flow Duration Method Sequential Streamflow Routing Method CVE 471 Water Resources Engineering 20/28
21 Components of Hydroelectric Power Plants Dam: to create head. Water intake: to take water and convert it to the penstock. Penstock: to take water with a high velocity to rotate turbines. Water-hummer problem in the penstock. Surge tank: to absorb water-hummer pressure. Powerhouse Substructure: electrical and mechanical instruments. Superstructure: the structural elements to protect and house the operating equipment. Tailrace: the channel at the downstream of the powerhouse, which receives water from the turbines. Transformers and transmission lines: to transmit electricity to consumers. CVE 471 Water Resources Engineering 21/28
22 Overview Characteristics of Electrical Power Plants Terminology Hydroelectric Power Plants Run-of-River Plants Storage Plants Pumped-Storage Plants Components of Hydroelectric Power Plants Availability of Hydroelectric Power and Energy Flow Duration Method Sequential Streamflow Routing Method CVE 471 Water Resources Engineering 22/28
23 Availability of Hydroelectric Power and Energy Streamflow data are required to estimate the availability of water for power generation. Flow-Duration curves may be generated to study the variation of flow in the river but they cannot provide info about chronological sequence of flow. Sequential streamflow routing method is used. To estimate the power potential of the river or reservoir, Sequential streamflow routing method considers: tailwater rating curve, reservoir operation studies, and downstream flow information CVE 471 Water Resources Engineering 23/28
24 Availability of Hydroelectric Power and Energy Hydroelectric Power: P = γ Q H g e Generated Energy: E = γ Q H g e t where P: power (kw) γ : specific weight of water (kn/m 3 ) Q : discharge (m 3 /s) H n : the net head (m) e : overall efficiency, e = e h e g e t (%) E : hydroelectric energy (kwh) t: time interval for power generation (hours). Electric energy is generally expressed in terms of its annual value ( t=8760 hr). CVE 471 Water Resources Engineering 24/28
25 Availability of Hydroelectric Power and Energy The mean annual energy productions of some of the large Turkish dams are: Ataturk Dam: 8.9 x 10 9 kwh Karakaya Dam: x 10 9 kwh Keban Dam: 6.0 x 10 9 kwh For small hydropower porjects (run-of-river projects), flow-duration curves can be converted to power-duration curves (Ex. 12.5). This curve then be used to estimate the energy potential of the river (Ex. 12.4) The installed capacity, P ins : The maximum power that a generator can develop. The load factor = (Average Power) / (Max. Power) Average annual plant factor (L) = E /(8760 P ins ) CVE 471 Water Resources Engineering 25/28
26 Availability of Hydroelectric Power and Energy Flow Duration Method Used particularly for run-of-river projects. Not applicable for more than one project. Procedure for determining the power-duration curve and average annual energy production: Example 12.5 Sequential Streamflow Routing Method Computes the energy output for each time interval in the period of analysis The method considers the effect of reservoir operation based on the continuity equation. This method is repeated for various installed capacities to determine an optimum size (installed capacity) that maximizes the annual energy production. Procedure best suits to computer application. CVE 471 Water Resources Engineering 26/28
27 Examples CVE 471 Water Resources Engineering 27/28
28 Examples Solution CVE 471 Water Resources Engineering 28/28
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