Hydropower Plant Pump Englisch

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    HydropowerPlant Kops IIHydropower

    Plant Kops IIThe new pump storage plant

    of Vorarlberger Illwerke AGin Gaschurn-Partenen

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    The Hydropower Plant Kops II is located parallel to the existing Kops

    Plant I in the Inner Montafon. The complete power plant in the munici-

    pal territory of Gaschurn extends from Kops (1,800 m) over Tafamunt

    (1,700 m) into the valley to Rifa (1,000 m) between the tourist centres

    Gaschurn and Partenen.

    All parts of the plant, including the power house, are situated inside

    the mountain. Only the 220 kV switching station executed with space

    saving indoor SF6technology and access roads and gates to the facilities

    situated inside the mountain are visible.

    March 20th, 2003 Policy decision to build the

    Hydropower Plant Kops II

    April 2003 Initiation of preliminary examination

    procedure for environmental impact

    assessment (EIA)

    September 2003 Application for implementation of an

    environmental impact assessment (EIA)

    March 2004 Verbal permission request procedure

    pursuant to the law on the environmental

    impact assessment

    July 2004 Definitive decision by the supervisory board

    of Illwerke to proceed with construction

    August 2004 Building permit becomes legally valid

    September 2004 Start of construction

    End of 2007/ Planned commissioning of the first

    beginning 2008 set of machines

    June 2008 Commissioning of machines 2 and 3

    Construction time 3.5 years

    Sum invested approx. EUR 360 million

    The Vorarlberger Illwerke AG (Illwerke) operate in total nine Alpine Hy-

    droelectric Power Plants in the most western part of Austria in Vorarl-

    berg (Montafon and Walgau) . The first power plant, the Vermunt plant

    started operation in 1930. In the course of different extension programs

    a compound group of Hydroelectric Power Plants and water resources

    was implemented until 1984.

    The liberalization of the electricity market and the rapid development

    of wind energy with wind-forces that cannot be influenced have led

    to an increasing demand for peak and control energy as well as for the

    possibility of a pump storage in large Alpine reservoirs. Illwerke respon-

    ded to this demand by developing and constructing the highly efficient

    pump storage Power Plant Kops II.

    In March 2003 the supervisory boards of the Illwerke made the policy

    decision to build Hydropower Plant Kops II into the existing Upper Ill

    Lner Reservoir scheme ( = power plants in the Montafon) for the ge-

    neration of highly efficient peak and control energy. Hydropower Plant

    Kops II increases the capacity of Illwerke in pumping mode by 85% and

    in turbine operation by 36%. No additional water resources are needed,

    as Kops II uses the existing Kops Reservoir as upper reservoir and the

    existing balancing reservoir Rifa as lower reservoir.

    HYDROPOWER PLANT KOPS II3 GEOGRAPHICAL SITUATION3

    Important benefits and synergies

    of Hydropower Plant Kops II:

    n 450 MW additional turbine and pump capacity for flexible

    supply of peak and control energy for the European grid

    n Expansion of combined use of other renewable sources of

    energy, e.g. wind energy

    n Strong positioning in the liberalized electricity market

    n Increase in the economic viability of the entire Upper Ill

    Lner Reservoir hydroelectric scheme

    n Value-added activities and economic boost for the Province

    of Vorarlberg and the Montafon

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    The Hydropower Plant Kops II is a pump storage plant that can be used

    to regulate the grid in turbine mode as well as in pump mode and is

    located parallel to Hydropower Plant Kops I.

    System components

    nIntake / outlet structures in Kops Reservoir

    n Valve chamber and bypass shaft

    n Pressure tunnel (Versal tunnel II)

    n Two chamber surge tank with inclined shaft and 3 throttles

    nPressure shaft

    n High-head manifold piping

    n Underground power house

    - machine cavern- 3 hydroelectric generating sets with Pelton turbine,

    motor generator, clutch and storage pump

    - transformer cavern

    nTailwater system

    - 3 compressed air surge chambers

    - tailrace to Rifa balancing reservoir

    - two chamber trailrace surge tank

    - low pressure manifold pipes

    n Outlet / intake structures in Rifa balancing reservoir

    n 220-kV-SF6switching station

    THE TECHNOLOGY3

    surge tank pressure tunnel

    pressure shaft

    gallery Tafamunt

    tailrace tunnel

    underground power house

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    pressure tunnel

    Headrace

    Pressure tunnel Versal tunnel II

    The pressure tunnel runs parallel to the existing pressure tunnel of Hy-

    dropower Plant Kops I and was excavated mechanically by a double-

    shield tunnel boring machine. The favourable geological and hydrogeo-

    logical conditions permitted a lining of the 5.5 km long pressure tunnel

    with precast concrete elements. This type of lining is a construction me-

    thod perfectly adapted to the high-alpine location of the construction

    site.

    Surge tank Aussertafamunt

    With control procedures, e.g. changing from turbine into pump opera-

    tion, the water flow must abruptly be slowed down in the tunnel and

    has to be accelerated into the opposite direction. In order to avoid high

    dynamic pressures that would have an additional effect upon the head

    THE TECHNOLOGY3

    n Length 5,552 m

    n Internal diameter 4.90 m

    n Longitudinal gradient 0.4 %

    race system, certain amounts of water can get out towards the surge

    tank. The surge tank is sort of an equalizing reservoir reducing the pres-

    sure fluctuations and/or limiting the high dynamic pressures in the en-

    tire headwater.

    The surge tank Aussertafamunt is located in the transition area from thepressure tunnel to the pressure shaft and consists of a lower chamber

    with two connections to the pressure tunnel, an inclined shaft with a

    throttle in its lower end, as well as of an upper chamber and a ventilati-

    on shaft leading into the access tunnel Tafamunt.

    n Lower chamber total length 250 m

    internal diameter 7.00 m

    n Inclined shaft length 185 m

    internal diameter 5.10 m

    longitudinal gradient 49

    n Upper chamber length 235 m

    internal diameter 6.20 m

    discharge shaftsurge tank

    galleryOberwald

    valve chamber

    galleryTafamunt

    pressure shaft

    Kops Reservoir

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    Storage pumps can only be used if operated with 100% load. With a

    surplus of power in the grid the adaptation to the fluctuations have to

    be compensated by a controllable pump. In order to be able to assure a

    power control also in pump mode, the principle of the hydraulic short-

    circuit is used in Hydropower Plant Kops II. The difference between the

    steady take of full load of the pump and the lesser surplus of power in the

    grid is compensated by the simultaneous operation of the turbines to the

    necessary extent. Since the turbine is assuring a good control ability in the

    complete range, a good control ability will also be given in pump mode.

    In Hydropower Plant Kops II the time for changing between turbine ope-

    ration and pump mode will be short in accordance with the requests of

    the grid.

    In order to satisfy the market demands, Hydropower Plant Kops II has a

    full range of control ability of +/- 100 % in turbine operation and in pump

    mode.

    Power control should as much as possible be provided in a range between

    0 % and 100 % in turbine operation as well as in pump mode in order to

    cover the deviation of the real and the predicted power demand in the

    grid.

    Pelton turbines are used because they guarantee a highest possible effi-

    ciency for minor power demands and/or power surplus in the grid and an

    optimal control ability. To this effect the pump and the turbine must be

    separated, a clutch must be provided and the elements have to be arran-

    ged on a machine axis together with the motor generator.

    POWER CONTROL

    IN PUMPING MODE3

    Example of an hydraulic short-circuit

    with surplus of power in the grid 100 MW, pump capacity 150 MW

    G/M generator/motorruns with 100 MW

    T turbine(Pelton with Hydropower Plant Kops II)

    supplies additional 50 MW

    P pump receives 150 MW

    Q water flow

    Pgrid = 100 MW surplus

    balancing reservoir Rifa

    Q with 100 MWQ with 50 MW

    Q with 150 MWQ with 150 MW

    150 MW

    Q with 100 MW

    Kops Reservoir

    50 MW

    100 MW G/M

    T

    P

    Q with 50 MW

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    In general, the geological conditions were favourable for the construc-

    tion of the power plant, in several sections however, difficult geological

    conditions were encountered, as anticipated.

    The facilities of Hydropower Plant Kops II are located completely in the

    rock seri