System strength considerations in a converter dominated power system

Helge Urdal; Richard Ierna; Jiebei Zhu; Chavdar Ivanov; Amir Dahresobh; Djaved Rostom

System strength considerations in a converter dominated power system

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Author(s): Helge Urdal ^{1, 2} ; Richard Ierna ³ ; Jiebei Zhu ³ ; Chavdar Ivanov ⁴ ; Amir Dahresobh ² ; Djaved Rostom ³
- Affiliations: 1: Urdal Power Solution Ltd, Warwick, UK;
  2: Previously with National Grid UK during the preparation of this paper;
  3: National Grid, Warwick, UK;
  4: European Network of Transmission System Operators for Electricity
Source: Volume 9, Issue 1, January 2015, p. 10 – 17
DOI: 10.1049/iet-rpg.2014.0199 , Print ISSN 1752-1416, Online ISSN 1752-1424

Received 08/06/2014, Accepted 27/10/2014, Revised 21/10/2014, Published 16/12/2014

The drive towards renewable energy sources (RES) is dramatically changing the dynamic electrical characteristics of Generators, which are traditionally the dominant dynamic component in Power Systems. Non-synchronous generation (NSG) approaching or even exceeding control area demand is now happening on a rapidly expanding scale. The study identifies from National Grid's perspective as Great Britain transmission system operator, the key challenges during periods of operation with high proportion of RES relative to demand. It raises some major questions. What determines system strength in an HVAC system largely without synchronous generators and what is adequate for stability? What levels of %NSG can be expected in the future energy scenarios? What are the financial consequences of constraining RES production if the technical capabilities create an upper limit of %NSG which the system can be operated at? The study finally proposes closer collaboration across the industry to find the optimal missing solutions.

References

1. 1)
  - 13. Gavrilovic, A.: ‘AC/DC system strength as indicated by short circuit ratios’. Int. Conf. on AC and DC Power Transmission, 17–20 September 1991, pp. 27–32.
2. 2)
  - P. Kundur , J. Paserba , V. Ajjarapu . Definition and classification of power system stability. IEEE Trans. Power Syst. , 3 , 1387 - 1401
3. 3)
  - 9. European Commission on ‘Single market for gas and electricity’. Available at http://ec.europa.eu/energy/gas_electricity/codes/codes_en.htm.
4. 4)
  - 3. National Grid: ‘Electricity Ten Year Statement’. Available at http://www2.nationalgrid.com/UK/Industry-information/Future-of-Energy/Electricity-ten-year-statement/Current-statement, accessed on 5th June 2014.
5. 5)
  - 16. Zhu, J., Guerrero, J.M., Hung, W., Booth, C.D., Adam, G.P.: ‘Generic inertia emulation controller for multi-terminal voltage-source-converter high voltage direct current systems’, IET Renew. Power Gen., 2014, 8, (7), pp. 740–748 (doi: 10.1049/iet-rpg.2014.0109).
6. 6)
  - 7. ENTSO-E: ‘Network Code Requirements for Generators’. Available at https://www.entsoe.eu/major-projects/network-code-development/requirements-for-generators/, accessed on 02 August 2014.
7. 7)
  - 11. National Grid: ‘UK Future Energy Scenarios’, 2013. Available at http://www2.nationalgrid.com/uk/industry-information/future-of-energy/future-energy-scenarios/ accessed on 29 may 2013.
8. 8)
  - 17. IEEE Guide for Planning DC Links Terminating at AC Locations Having Low Short-Circuit Capacities’, IEEE Std 1204–1997, 1997.
9. 9)
  - 11. Qing-Chang, Z., Weiss, G.: ‘Synchronverters: inverters that mimic synchronous generators’, IEEE Trans. Ind. Electron., 2011, 58, pp. 1259–1267 (doi: 10.1109/TIE.2010.2048839).
10. 10)
  - 12. ENTSO-E: NC HVDC- Call for Stakeholder Input, Available online [accessed on 09/08/2013]: https://www.entsoe.eu/fileadmin/user_upload/_library/resources/HVDC/130507-NC_HVDC_-_Call_for_Stakeholder_Input.pdf.
11. 11)
  - 2. Johnson, A., Tleis, N.: ‘The development of grid code requirements for new and renewable forms of generation in Great Britain’. Int. Workshop on Large-scale Integration of wind Power and Transm. Networks for Offshore Wind Farms, Scotland, April 2005.
12. 12)
  - 18. Anaya-Lara, O., Hughes, F.M., Jenkins, N., Strbac, G.: ‘Provision of a synchronising power characteristic on DFIG-based wind farms’, IET Gener., Transm. Distrib., 2007, 1, (1), pp. 162–169 (doi: 10.1049/iet-gtd:20050262).
13. 13)
  - 10. Hamidi, V., Vilde, L. (National Grid, UK): ‘Considerations of future small signal stability in GB networks’, 12th Wind Integration Workshop, London, UK, 2013.
14. 14)
  - 8. ENTSO-E: ‘Network Code Demand Connection Code’. Available at https://www.entsoe.eu/major-projects/network-code-development/demand-connection/.
15. 15)
  - 15. System Operability Framework 2014. Available at http://www2.nationalgrid.com/UK/Industry-information/Future-of-Energy/System-Operability-Framework/, accessed on 12 September 2014.
16. 16)
  - 10. Zhu, J., Booth, C.D., Adam, G.P., Roscoe, A.J., Bright, C.G.: ‘Inertia emulation control strategy for VSC-HVDC transmission systems’, IEEE Trans. Power Syst., 2013, 28, (2), pp. 1277–1287 (doi: 10.1109/TPWRS.2012.2213101).
17. 17)
  - 6. Gargov, N., Dahresobh, A., Rostom, D., Hamidi, V. (National Grid, UK): ‘Demand side response contributing to meet the emerging challenge of decreasing total system inertia’. 12th Wind Integration Workshop, London, UK, 2013.
18. 18)
  - 5. Zhu, J. (National Grid, UK), Urdal, H. (National Grid, UK): ‘Synthetic inertia control strategy for double-fed induction generator wind turbine generators using energy from DC capacitor’. 12th Wind Integration Workshop, London, UK, 2013.

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System strength considerations in a converter dominated power system

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