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Some aspects of windpower supply into electrical grid

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Presentation on theme: "Some aspects of windpower supply into electrical grid"— Presentation transcript:

1 Some aspects of windpower supply into electrical grid
Prof. Dr. Rainer Haller ZCU Pilsen/ HS Regensburg

2 Reliability of electrical energy supply in Germany
Anzahl der Störungen 110 kV 220 kV 380 kV VU = break of supply

3 Wind energy supply into electrical grid
realization of state rules (EEG) 50 x kW 1 x 200 kW

4 Offshore-Projects in the North Sea (final status)
380-kV-UW 220-kV-UW Kraftwerk DK UW Dollern UW Brunsbüttel UW Flensburg UW Audorf 1200 MW UW Emden UW Conneforde UW Wilhemshaven UW Diele 3200 MW Amrumbank West 1760 MW Nordsee-Ost 400 MW Borkum West 1040 MW Borkum Riffgrund West 2290 MW Borkum Riffgrund 625 MW Hochsee WP Nordsee 2900 MW Dan Tysk 1500 MW Bürgerwindpark Butendiek 240 MW Nordergründe 240 MW Meerwind 1020 MW North Sea Windpower 1430 MW Sandbank 2600 MW OWP Nordsee ? MW Nördlicher Grund 2100 MW Schl.-Holst. Nordsee 500 MW Nordsee 4340 MW 3680 MW 8285 MW Offshore-WP MW NL Kraftwerke MW

5 Increasing of Windpower supply z.B. E.ON Netz
(Angaben in MW) 3.800 6.400 12.800 15.700 Summe 800 6.000 7.500 Offshore 3.800 5.600 6.800 8.200 Onshore 2001 2006 2011 2016

6 Increasing of grid facilities z.B. E.ON Netz
(Angaben in MW) 3.800 6.400 12.800 15.700 Summe 350 km (110 Mio. €) 700 km (400 Mio. €) 1.000 km kumulierte zusätzlich wind- bedingte Trassen- kilometer 110/380 kV (550 Mio. €) Offshore Onshore 2001 2006 2011 2016

7 Power flow and Windpower supply
without Wind additional windpower G 380/220 kV G 380/220 kV Netz Netz 110 kV 110 kV Netz Netz 20 kV 20 kV Last Netz Last Netz Verteilnetz Sammelnetz

8 Consequences of WP supply for grid facilities and structure
Erheblicher Ausbaubedarf des Höchst- und Hochspannungsnetzes für den Anschluss von großen Windenergieanlagen Bisherige Dimensionierung entsprechend der maximalen Verbraucherleistung Zukünftige Dimensionierung entsprechend dem Abtransport der eingespeisten Windleistung

9 Problems of „power steps“
Dispatcher ohne Windenergie im November 1994 mit Windenergie im Januar 2000

10 Increasing demand of regulating energy
dispatcher 400 MW in 15 min power steps during one day Mo Di Mi Do Fr Sa So Varianz 1700 MW stochastical change during one week

11 Increasing problems at grid operations
dispatcher problems for grid operation demands to the Wind Generators increased overload of transmission capacity problems at voltage tolerances (missing reactive power) problems at short circuit failures for grid stability Regulation of active power (rated value and gradient) additional reactive power by WG in a large range of cos reducing of active power by WG over 51,5 Hz no switching of WG at grid short circuits

12 Technical realization of WG
ASG Ge- triebe Asynchrongenerator (AG) ~ ASG Ge- triebe Umrichter Doppelt gespeister ASG (DG) SG ~ DC Umrichter Synchrongenerator (SG)

13 Voltage profil after a three phase short circuit
Short circuit simulation in real grid (E.ON) Voltage profil after a three phase short circuit Wind power will be switched off at short circuit

14 Wind (outage) power versus UCTE- primary regulating power
installed power outage power Converter DG/SG outage power Mix AG/DG/SG max permissible outage power accord. UCTE

15 Problems of three phase short circuit in transmission grid
Voltage significant under 90 % large area outage of wind power primary regulating power no sufficient (UCTE max MW) decreasing of frequency under 50 Hz switching off for large power consumers (DVG 5-Stufenplan possible outage into UCTE grid at short circuit the switching off for WG under 0,8 U/UN *) cannot be allowed grid code for WG e.g. for E.ON Netz [ Quelle: *) VDEW Richtlinie "Eigenerzeugungsanlagen am Mittelspannungsnetz"

16 problems for power plants and grids
increasing regulation power and higher demands for regulation possibilities of power units (esp. basic load power plants) Increasing taking into account of wind power for dispatching of planning power plants (nighty at large wind only KKW and WG on grid) changing of power flow in the UHV- and HV- grid (problems of power trading) grids increasing problems of transmission capacities of important power connection lines (bottleneck problems) increasing problems in additional generating of reactive power increasing problems for grid stability at short circuit failures

17 Conclusions and outlook
political rules and energy laws modification of WG (no separation at short circuit) large wind power plants repowering and optimization of grids and pp increasing of regulating power (conv. pp) grid operation increasing of planned wind power plants and their connection into the transmission grid requests significant technical and economical efforts

18 Realization of the project „BorWin1“
Outlook Realization of the project „BorWin1“ (connection of windpower plant „BARD“) technical data: length ca. 200 km transmission line (2 x 200 MW, HVDC) 2 converter units (HVDC- HVAC, HVDC – HVAC)

19

20 problems of on- shore grid

21 principle for on- shore grid:
grid optimization (repowering, monitoring, ..) additional lines

22 influence of climate conditions for current load capacity

23 principle of overhead- line- monitoring

24 introduction of monitoring system requests the repowering of all components of grid

25 on- site testing of monitoring [E.ON- Netz]

26 Increased transmission capacity by using of monitoring
one week

27 advantages by using of monitoring system


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