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

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Presentation on theme: "Some aspects of windpower supply into electrical grid Prof. Dr. Rainer Haller ZCU Pilsen/ HS Regensburg."— 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 110 kV220 kV380 kV Anzahl der Störungen VU = break of supply

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

4 Offshore-Projects in the North Sea (final status) 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 Kraftwerke MW DK Nordsee 8285 MW 3680 MW 4340 MW NL UW Dollern UW Brunsbüttel UW Flensburg UW Audorf 1200 MW UW Emden UW Conneforde UW Wilhemshaven UW Diele 3200 MW 380-kV-UW220-kV-UWKraftwerk Offshore-WP MW

5 Increasing of Windpower supply z.B. E.ON Netz Summe Onshore Offshore (Angaben in MW)

6 Increasing of grid facilities z.B. E.ON Netz (Angaben in MW) Summe Onshore Offshore 350 km (110 Mio. ) 700 km (400 Mio. ) km kumulierte zusätzlich wind- bedingte Trassen- kilometer 110/380 kV (550 Mio. )

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

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

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

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

11 increased overload of transmission capacity problems at voltage tolerances (missing reactive power) problems at short circuit failures for grid stability increased overload of transmission capacity problems at voltage tolerances (missing reactive power) problems at short circuit failures for grid stability Increasing problems at grid operations problems for grid operationdemands to the Wind Generators 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 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 dispatcher

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) 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/U N * ) cannot be allowed * ) VDEW Richtlinie "Eigenerzeugungsanlagen am Mittelspannungsnetz" grid code for WG e.g. for E.ON Netz [ Quelle:

16 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) 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) problems for power plants and 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 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 grids power plants

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

18 Realization of the project BorWin1 (connection of windpower plant BARD) Outlook 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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