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Large Scale Renewables

Large Scale Renewables. Present Position Future demand for connections Special Protection Schemes Post fault Pre fault. Large Scale Renewables Oct 2008. 1 as of August 2008. NI Summer min 550MW Winter max 1850MW RoI Summer min 1800MW Winter max 4930MW.

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Large Scale Renewables

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  1. Large Scale Renewables • Present Position • Future demand for connections • Special Protection Schemes • Post fault • Pre fault

  2. Large Scale Renewables Oct 2008 1as of August 2008 NI Summer min 550MW Winter max 1850MW RoI Summer min 1800MW Winter max 4930MW

  3. Large Scale Renewables Oct 2008 *estimate

  4. NIE Actions to date • Promised 250MW connected to our network in 2003 • Now promised 420MW with some non-firmness (about 280MW firm) • Sense that the decision to require planning permission has been generally helpful but does giving development timing issues • NIAUR has been supportive of clustering approaches to optimise network development • This network capacity using creative ways of network management – other utilities following in the use of SPS schemes. • Has involved some risk sharing with renewables developers

  5. NIE TRANSMISSION NETWORK with 350MW of wind LOGUESTOWN COLERAINE COOLKEERAGH POWER STATION LIMAVADY LISAGHMORE BALLYLUMFORD POWERSTATION TO LETTERKENNY BALLYMENA LARNE KELLS B CREAGH MOYLE INTERCONECTOR STRABANE MAGHERAFELT E KILROOT POWER STATION NORFIL CR ANTRIM 275KV DOUBLE CCT G RATHGAEL PSW 275KV SINGLE CCT K BC R 110KV DOUBLE CCT DG CE NEWTOWNARDS H 110KV SINGLE CCT MOYLE HV DC LINK CASTLEREAGH F OMAGH POWERSTATION TYRONE LISBURN DUNGANNON 275KV SUBSTATION WARRINGSTOWN DRUMNAKELLY 110KV SUBSTATION POWER FLOW CONTROLLER BALLYNAHINCH TANDRAGEE MECH SWITCHED CAPACITANCE ENNISKILLEN BANBRIDGE NEWRY TO SWANLINBAR LOUTH Note – present commitment 420MW reached with Remedial Action Schemes and non-firm access

  6. Post-fault and pre-fault constraints • Post-fault • Allows the system to be used to some capacity or security limit, and trips wind farms if part of the system is unexpectedly outages. Little downtime for windfarms but network maintenance has to be managed. Windfarm contracts allow for this. • Pre-fault • A stability limit prevents shedding more windfarms after a fault so further windfarms can only be generating when the system security is not threatened. A full range of conditions has been examined and wind farms have been allowed to connect and operate depending upon: • Seasonality and line rating • Other active generation levels in the region

  7. Typical Post fault schemes If any of the three lines is outaged at times of low load then Line A or B can overload C S/S A G G B Monitor for overloads and instruct windfarm constraint [The scheme needs a backup so that scheme failure does not damage the line. If one of the lines is planned to be out of service, constrain wind farms output.]

  8. Typical pre-fault constraint scheme • Windfarm can generate X MW provided that: • NI or local system load is above Y MW • Summer line ratings are not being applied • Other system conditions are above or below a threshold • NIE and SONI are satisfied that the windfarm can respond to the conditions with certainty • NIE and SONI are satisfied that the failure of any scheme does not create damage or an uncertain outcome. • Temporary measure until infrastructure is available

  9. Scheme modifiers for the future • Possible further reduction of risk for wind farms if dynamic line ratings could be incorporated into RAS operation. • This will require a technical and risk analysis for operating

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