Obervermuntwerk II

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Obervermuntwerk II
The Vermuntsee with the Obervermuntwerk I on the right edge of the picture. The Obervermuntwerk II is located between the Obervermuntwerk I and the dam in the mountain.
The Vermuntsee with the Obervermuntwerk I on the right edge of the picture. The Obervermuntwerk II is located between the Obervermuntwerk I and the dam in the mountain.
location
Obervermuntwerk II (Vorarlberg)
Obervermuntwerk II
Coordinates 46 ° 56 '10 "  N , 10 ° 3' 45"  E Coordinates: 46 ° 56 '10 "  N , 10 ° 3' 45"  E
country AustriaAustria Austria
VorarlbergVorarlberg Vorarlberg
place Gaschurn
Waters Ill, Bieltalbach
Height upstream 2030  m above sea level A.
power plant
owner illwerke vkw AG
operator illwerke vkw AG
Start of planning 2010
construction time 2014-2019
Start of operation 2019
technology
Bottleneck performance 360 megawatts
Average
height of fall 		Max. 311.2 m
Expansion flow in turbine operation 150 m³ / s
Turbines 2
Generators Three-phase generators
Others
Website www.illwerkevkw.at
was standing 2019
Above-ground pressure pipeline from the Silvretta reservoir to Obervermuntwerk I - will be dismantled after the completion of Obervermuntwerk II.

The Obervermuntwerk II (OVW II) is a high-pressure pumped storage power plant of illwerke vkw AG on Lake Vermunt in the Austrian state of Vorarlberg .

It is part of the Obere Ill-Lünersee power plant group and, located in the municipality of Gaschurn , uses the difference in altitude from the Silvretta reservoir ( 2030  m above sea level ) to the Vermunt reservoir at 1743  m above sea level. A. to generate electrical energy . The power plant is located underground on Lake Vermunt and has a bottleneck capacity of 360  megawatts .

history

The construction of the Obervermuntwerk I began in 1938. Shortly after completion, plans were drawn up to implement a further power plant stage between the Silvretta and Vermunt storage facilities. In the 1980s, replacement solutions for the above-ground pressure pipeline with an underground variant were considered and various project variants were developed. Between 2000 and 2009, several options for renewing the Obervermunt penstock were examined.

The construction of the Obervermuntwerk II started on May 5, 2014 and will result in an optimization of the energy resources that are considered necessary, which are currently only partially used by the existing Obervermuntwerk I (parallel power plant). The planning for the Obervermuntwerk II began in 2010. By 2013, the necessary administrative procedure had been completed.

With the Obervermuntwerk II, the full capacity of both Silvrettasee and Vermuntsee storage facilities can now be used for energy purposes. The aim is to achieve a pumped storage efficiency of around 80 percent. No new water resources are required for Obervermuntwerk II, as existing storage capacities can be used.

The investment volume was around 500 million euros, with around half of the investments being covered by own funds.

After the trial commissioning of the second machine set at the end of 2018 and a review in the first half of 2019, the power plant was opened on June 7, 2019. As early as October 2019, as part of an inspection, damage to the power plant was found and it was shut down. Both machine sets had to be repaired. One of the machine sets was able to go back into operation in mid-December 2019.

technology

Power plant group Obere Ill-Lünersee
Schematic representation

                  
Transfer from the Brandner Glacier 2480  m above sea level A.
                  
Ill origin ( Ochsentaler Glacier ) 2460  m
                  
                  
Tributaries
                  
Silvretta reservoir 2030  m
                  
Drain to Ill  |  Lünersee 1970  m
                  
Tributaries
                  
Kleinvermunt pumping station 1670  m
                  
Stream crossing Fasulbach and Rosanna
                  
Kops reservoir 1809  m
                  
Obervermuntwerk I 1743  m
                  
Transfer Kops-Vermunt with tributaries
                  
Tributaries
                  
Vermuntsee 1743  m
                  
Lockroom salonies 1690  m
                  
Obervermuntwerk II 1655  m
                  
                  
Rells-, Vilifau- and Zaluandabach tributaries
                  
Storage basin rells 1456  m
                  
Rellswerk 1430  m
                  
                  
Kopswerk II   |   Kopswerk  I   |   Vermuntwerk 1025  m
                  
                  
Partenen compensation pool 1025  m
                  
Free-flow tunnel Partenen-Latschau
                  
Rifawerk 1005  m
                  
                  
Rifa compensation pool 1007  m
                  
Tributaries Garnera, Vermilbach, Suggadin
                  
Lünerseewerk 992  m
                  
Latschau reservoir 992  m
                  
Latschauwerk 985  m
                  
                  
                  
Rodundwerk I   |   Rodundwerk II 645  m
                  
Inflow from Ill
                  
Rodund basin  I to III 645  m
                  
Drain to Ill
                  
Alvier tributary
                  
Inflow quantity
                  
Walgauwerk 492  m
                  
Walgau compensation basin 492  m
                  
Drain to Ill

It is the second largest power plant operated by illwerke vkw and is monitored fully automatically and remotely by the illwerke vkw control center (icc) in Vandans .

Power house - machine cavern

With the two horizontal machine sets, the power plant is also used especially for rapid deployment to compensate for grid fluctuations through renewable energy sources ( wind energy , solar energy - photovoltaics ). Each machine set consists of a Francis turbine , a motor generator , a clutch and a pump, the associated regulation and control equipment and other ancillary systems.

Like the Kopswerk I and Kopswerk II power plants, this power plant is designed as a cavern power plant . This significantly reduces visual interventions in the landscape and the risk to power plants from avalanches. The machine cavern is around 117 m long and 33 m high, has a maximum width of around 33 m and the bottom width is around 25 m. Two bridge cranes with a load capacity of 130 t each, which can be coupled to lift 250 t, are installed under the roof.

Technical specifications

Energy generation
  • Manufacturer turbine: Andritz AG
  • Turbine type: Francis
  • Total turbine capacity (bottleneck capacity): 360 MW
  • Single turbine output: 180 MW
  • Generator nominal power: 200 MVA
  • Total flow rate of the turbines: 150 m³ / s
  • Speed: 428.5 / min
  • smallest fall height 243.20 m,
  • greatest fall height 311.20 m.
Pumping operation

Pump manufacturer: Voith

  • Power consumption of the pumps: 2 × 180 MW
  • Total flow rate of the pumps: 135 m³ / s

The machine sets are used to generate control energy and peak energy . The full adaptability of the power consumption of the machine sets in pumping operation is achieved through the use of the hydraulic short circuit .

Drive / generator

Both assemblies are driven by a seven-pole motor generator from General Electric with a nominal speed of 428.5 per minute. The motor-generators are arranged between the turbine and the pump and are separated from the turbine by a load clutch and from the pump by a converter.

Management and transformation

Section of the new power plant line Obervermuntwerk II

The transformer cavern is connected to the machine cavern (viewed from the north on the front side in front of the machine cavern). It has a total length of around 46 m, is around 19 m high and 19.5 m wide. The transformers of the two machine sets and an additional network coupling transformer, the SF6 high-voltage switchgear , parts of the ventilation system and the heating are installed in the transformer cavern . For safety reasons, the transformers from Siemens are housed in their own transformer boxes, which are equipped with automatic extinguishing systems. The main transformers weigh 270 tons.

The Obervermuntwerk II is connected to the 220 kV voltage level. A cable system leads from the switchgear in the transformer cavern to the switchgear of Kopswerk I in Partenen and from there via the existing 220-kV overhead line systems from Partenen to Bürs (Bürs transformer station). Since high-voltage pylons are not erected in the narrow valley above Partenen due to the danger of avalanches, the current is first conducted through the tunnels of the former Höhenbahn to Trominier and from there along the Vermuntbahn route to Partenen.

The power station cavern is self-sufficient in three ways:

  • a 40 MVA transformer via the 220 kV connection,
  • via the existing 20 kV infrastructure network via "Partenen Loch" and the Vermunt station,
  • via an autonomous 20 kV feed from Obervermuntwerk I.

Hydraulic data

Any change in the headrace caused by the load changes of the machine sets, such as B. starting or braking of the machines, opening or closing the shut-off devices, is compensated by the moated castle Krespa (near the Silvretta high alpine road ) or the moated castle Seelikopf (for the underwater guidance). This limitation of pressure surge and vibration processes is made possible by appropriate dimensioning of the lines and the surge tank.

Disused pressure pipeline to Obervermuntwerk I

The water for the Obervermuntwerk II comes from the Silvretta reservoir ( upper reservoir )

  • an inlet tunnel (length: 170 m, diameter: 6.80 m),
  • a pressure tunnel laid in the rock (length: 2800 m, diameter: 6.80 m) or
  • Pressure shaft (length 110 m, diameter: 4.50 m)

led to the cavern power house at Vermuntsee . The Vermuntsee serves as a sub-storage facility and is connected to the cavern with an underwater tunnel (length: 380 m, diameter: 6.40 m).

The existing above-ground pressure pipeline of the Obervermuntwerk I (3.3 km long) was replaced by the joint new underground headwaters with the Obervermuntwerk II. The pressure tunnel is designed as a pipe tunnel. Not the entire broken cross-section is used for the pressure tunnel. In the excavated pipe tunnel there is a steel pressure pipeline with a diameter of around 3.80 meters that rests on so-called “supports”. The connection from the valve chamber of the power plant to the Silvretta tunnel is around 1,270 meters long.

Construction phases

Mountain station of the temporary material cable car Obervermuntwerk II in Partenen, Vorarlberg, Austria at 1741 m above sea level.

The project phase for the construction of the power plant began in 2010, the necessary environmental impact assessment was carried out from 2011 and completed in 2013. The excavation work began in 2014. Concrete work began in 2015, somewhat delayed after the excavation work.

The mechanical and electrical work was carried out according to the construction progress. The hydraulic steelwork began in 2015. The old pressure pipeline to Obervermuntwerk I, which is no longer required, is to be dismantled by the end of 2021.

The Silvrettasee was always frozen over in winter. In the area of ​​the lake, this enabled an approach to the Wiesbadener Hütte, largely free from avalanches . Furthermore, a cross-country ski trail was always laid out on the lake in winter. Due to the fact that the outflow and inflow has increased several times compared to the Obervermuntwerk I, the lake in the northern part no longer freezes over. For this reason, a tunnel was driven through the northeast foothills of the Lobspitz massif in the south of the dams at the beginning of the construction work.

For the construction phase of the power plant and especially to supply the construction site in winter (closure of the Silvretta-Hochalpenstraße ), a temporary material ropeway was built.

Technical data cable car

  • Manufacturer: LCS Cable Cranes ( Sulz )
  • Construction: June to September 2014
  • Valley station: near the toll station Silvretta Hochalpenstraße ( 1143  m above sea level )
  • Mountain station: at Vermuntsee ( 1741  m above sea level )
  • Difference in altitude: 598 m
  • Inclined length: 2640 m
  • Free-standing supports: 7
  • Support height: 20 to 37 m
  • Drive: two regulated three-phase drives with 400 kW each
  • Travel speed: 2 m / s (at 20 to) or 3 m / s (up to 17 to)
  • Due to the high water intake and supply through the Obervermuntwerk II, the Silvrettasee no longer completely freezes over in winter.
    Payload: 20 tons

Web links

Commons : Obervermuntwerke  - collection of images, videos and audio files

swell

Individual evidence

  1. ↑ Quoted from: OBERVERMUNTWERK II, UVP procedure , p. 41 f.
  2. ↑ Obervermuntwerk II: start of construction for the 500 million euro project. on: vol.at. However, these investments in a pumped storage power plant with regard to the current electricity market are already under criticism: Pumped storage power plants are becoming unprofitable.  ( format.at ( Memento from May 18, 2014 in the Internet Archive ))
  3. ↑ Obervermuntwerk II was officially opened. on: ORF of June 7, 2019, accessed on June 7, 2019.
  4. ↑ Still not at full speed , Vorarlberger Nachrichten of January 16, 2020, p. D1.
  5. ↑ It is calculated with rock excavation material in an order of magnitude of about 800,000 cubic meters (vol.at) .
  6. ↑ obervermuntwerk2.at
  7. ^ Illwerke: Obervermuntwerk 2. Accessed June 7, 2019 .
  8. ↑ Power plant tour in the Lünerseewerk , 2014.