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Transmission Distribution Interface bottlenecks and strategies for improved grid Stability

Transmission Distribution Interface bottlenecks and strategies for improved grid Stability. By Engr. A.S.A Bada CEO (TCN). GRID INTERFACE BOTTLENECKS. Major Causes include : Radial state of network Spatial network coverage Transformer Capacity Constraints Line Capacity Constraints

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Transmission Distribution Interface bottlenecks and strategies for improved grid Stability

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  1. Transmission Distribution Interface bottlenecks and strategies for improved grid Stability By Engr. A.S.A Bada CEO (TCN)

  2. GRID INTERFACE BOTTLENECKS Major Causes include: • Radial state of network • Spatial network coverage • Transformer Capacity Constraints • Line Capacity Constraints • Switchgear Conditions • Grid indiscipline • Distribution network Conditions • Frequent trippings/Persistent faults

  3. STATE OF NETWORK • Radial State of network • Steps Taken: NIPP presently constructing the closing of the loop to Jos with a DC 330KV line • Spatial Network Coverage • Steps Taken: 26No. Lines and Substation projects awarded in 2010 and 18No. Lines and Substation projects to be awarded before the end of this year (4 New substations to be constructed in the North Eastern part and 5 New Substations in the NW )

  4. Transformer Capacity Constraints Steps Taken: On-going Capacity Strengthening Projects

  5. ON-GOING CAPACITY STRENGTHENING PROJECTS...............Ctd

  6. ON-GOING CAPACITY STRENGTHENING PROJECTS...............Ctd • TCN expects delivery of Power Transformers from 1st quarter of 2012 • 4No. 300MVA 330/132KV Transformers • 5No. 150MVA 330/132KV Transformers • 10No. 100MVA 132/33KV Transformers • 10No. 60MVA 132/33KV Transformers

  7. LINE CAPACITY CONSTRAINTS Steps Taken: • Gombe – Yola 330kV line has been energized • 2nd Benin – Ajaokuta 330kV line has finally been rehabilitated • 3rd Benin –Onitsha DC 330kV line to be commissioned soon • Re-conductoring of weak and old lines (e.gAba – Itu, Itu – Calabar , Afam – PH, Delta – Effurun, Ota - Papalanto) with higher thermal capacity conductors are in various stages.

  8. OUTCOME OF STRATEGY MEETINGS

  9. URGENT CONCERNS • Too frequent 33KV trippings • Inadequate notification of expansion projects

  10. 33KV TRIPPINGS FOR NOV. WK 1

  11. MITIGATION STRATIGIES FROM DISCO’s • Submission of accurate data on customer population and installed capacity (MVA) • De-loading of 33KV Feeders through network expansion • Explore use of lattice towers for long 33KV Lines • Due to inadequate generation power should be given to some feeders then transferred to the others over time RATHER THAN pro-lateral sharing of power on all the feeders at the same time

  12. MITIGATION STRATIGIES FROM DISCO’s • Adherence to operational instructions • Gradual phase out of wooden cross arms with fibre • Movement of load on designated under frequency relays should henceforth stop • Disciplinary actions should be meted out on erring staffs

  13. MITIGATION STRATIGIES FROM DISCO’s....... • Supervising operators should henceforth be alive to their responsibilities • Issuance of a circular from their respective CEO’s demanding strict adherence to operational instructions

  14. Further Key Transmission Grid Challenges • Due to urbanization and environmental issues, it is becoming increasing difficult to acquire Right- Of-Way for new lines • Increased power demand due to growth in industries and population • Vandalization of transmission lines • Adverse Weather Conditions • Poor power quality • Transmission grid upgrades cannot keep pace with power demand

  15. STRATEGIES - Work is on-going on grid expansion. - Significant Investment is being made to effectively double existing capacity through the NIPP intervention • Line trace issues (mitigation against frequent line trips) have been taken more seriously with focus on contracting companies with requisite tools to work on difficult terrains • Frequency stability has been largely achieved with some units in Delta, Kainji and Egbin providing frequency support in form of reserve margins • Deployment of FACTS facility at strategic node of the network (e.g Kano, Gombe) • Work has commenced in deploying the Supergrid network

  16. 330KV GRID STRUCTURE AFTER COMPLETION OF ALL ON-GOING PROJECTS REPUBLIC OF CHAD Niamey NIGER SOKOTO Sokoto Katsina 132 kV YOBE Hadejia JIGAWA BORNO Birnin Kebbi Gusau KATSINA Damaturu ZAMFARA Potiskum Kano Maiduguri KEBBI KANO REPUBLIC OF BENIN KADUNA BAUCHI Bauchi Kaduna SHIRORO Jos NIGER Gombe KAINJI ADAMAWA GOMBE REPUBLIC OF CAMEROON Minna KWARA JEBBA/GS Yola Abuja PLATEAU Jalingo JEBBA/TS ABUJA NIGERIA IIorin OYO NASSARAWA Lafia TARABA Lokoja Osogbo Makurdi Ado Ekiti Ibadan AJAOKUTA MAKURDI EKITI Bali OSUN OGUN BENUE KOGI Abeokuta Mambila Akure Aliade ALAGBADO ONDO 2015 : new 2015 : new 2015 : new 2010 : new 2015 : 3rd Circuit ENUGU 2010: new 2015 : new 2015 : new EGBIN P/ST. EDO Benin Enugu EBONYI Ikeja Akwa Asaba 2005 : new LAGOS ONITSHA Abakaliki AN AMBRA 2 2 2 4 2 2 3 2 2 2 2 2 3 2 4 2 SAPELE P/ST. 330KV LINES – MULTIPLE CIRCUITS NOTE: CROSS RIVER IMO Umuahia 330KV LINES - EXISTING ABIA DELTA POWER ST. Owerri BULK SUPPLY POINT 330 KV DELTA RIVERS H Uyo Calabar HYDROELECTRIC POWER STATION Port Harcourt AKWA IBOM BAYELSA THERMAL POWER STATIONS ATLANTIC OCEAN AFAM POWER ST. 2015 : new 2015 : new 2015 : new Zaria 2015 : 2nd Circuit SAPELE P/ST. 2015 : new Geregu Mambila Hydro Okitipupa Agip Some 330kV lines especially in Lagos and Delta areas could not be indicated on this geographical Map. See attached single diagram for Details.

  17. TRANSMISSION GRID STRUCTURE WITH THE SUPER GRID IN PLACE TCN NETWORK WITH SUPERGRID REPUBLIC OF CHAD Niamey NIGER SOKOTO Sokoto Katsina 132 kV YOBE Hadejia JIGAWA BORNO Birnin Kebbi Gusau KATSINA Damaturu ZAMFARA Potiskum Kano Maiduguri KEBBI KANO REPUBLIC OF BENIN KADUNA BAUCHI Bauchi Kaduna SHIRORO Jos NIGER Gombe KAINJI ADAMAWA GOMBE Minna KWARA JEBBA/GS Yola Abuja PLATEAU Jalingo JEBBA/TS ABUJA NIGERIA IIorin REPUBLIC OF CAMEROON OYO NASSARAWA Lafia TARABA Lokoja Osogbo Makurdi Ado Ekiti Ibadan AJAOKUTA MAKURDI EKITI Bali OSUN OGUN BENUE KOGI Abeokuta Mambila Akure Aliade ALAGBADO ONDO 2015 : new 2015 : new 2015 : new 2010 : new 2015 : 3rd Circuit ENUGU 2015 : new 2010: new 2015 : new EGBIN P/ST. EDO TRANSMISSION LINE LEGEND Benin Enugu EBONYI Ikeja Akwa Asaba 2005 : new LAGOS ONITSHA Abakaliki AN AMBRA 2 2 2 4 2 3 2 2 2 2 2 2 4 3 2 2 SAPELE P/ST. 330KV LINES – MULTIPLE CIRCUITS CROSS RIVER IMO Umuahia 330KV LINES - EXISTING ABIA DELTA POWER ST. Owerri BULK SUPPLY POINT 330 KV DELTA RIVERS H Uyo Calabar HYDROELECTRIC POWER STATION Port Harcourt AKWA IBOM BAYELSA THERMAL POWER STATIONS ATLANTIC OCEAN AFAM POWER ST. 2015 : new 2015 : new 2015 : new Zaria 2015 : 2nd Circuit SAPELE P/ST. 2015 : new Geregu Mambila Hydro Okitipupa 700KV LINES – SUPER GRID Agip 700 / 330KV SUBSTATION NOTE: Some 330kV lines especially in Lagos and Delta areas could not be indicated on this geographical Map. See attached single diagram for Details.

  18. THANK YOU

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