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GRID CONNECTION CODE for RENEWABLE POWER PLANTS (Rpps) CONNECTED to the ELECTRICITY TRANSMISSION SYSTEM (TS ) OR the DISTRIBUTION SYSTEM (DS ) in SOUTH AFRICA

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GRID CONNECTION CODE for RENEWABLE POWER PLANTS (Rpps) CONNECTED to the ELECTRICITY TRANSMISSION SYSTEM (TS ) OR the DISTRIBUTION SYSTEM (DS ) in SOUTH AFRICA GRID CONNECTION CODE FOR RENEWABLE POWER PLANTS (RPPs) CONNECTED TO THE ELECTRICITY TRANSMISSION SYSTEM (TS ) OR THE DISTRIBUTION SYSTEM (DS ) IN SOUTH AFRICA Version 2.8 (July 2014) This document is approved by the National Energy Regulator of South Africa (NERSA) Issued by: RSA Grid Code Secretariat Contact: Mr. B. Magoro or Mr. T. Khoza Eskom Transmission Division P.O Box 103, Germiston 1400 Tell: +27 (0)11 871 2774 / 2368 Fax: +27 (0)86 663 8418 Email: [email protected] or [email protected] Page 2 Grid Connection Code for RPPs in South Africa - Version 2.8 July 2014 Table of Contents Paragraph No./Title Page Number 1. Grid Connection Code Basis .......................................................................... 5 1.1 Legislation ................................................................................................................ 5 1.2 Handling of Non-compliances and Deviations ..................................................... 5 2. Objectives ........................................................................................................ 5 3. Scope ............................................................................................................... 5 4. Definitions and Abbreviations ........................................................................ 7 5. Tolerance of Frequency and Voltage Deviations ........................................ 12 5.1 Normal Operating Conditions .............................................................................. 12 5.1.1 Synchronising to the NIPS .......................................................................................... 14 5.2 Abnormal Operating Conditions .......................................................................... 14 5.2.1 Tolerance to sudden voltage drops and peaks ........................................................... 15 6. Frequency Response .................................................................................... 18 6.1 Power-frequency response curve for RPPs........................................................ 18 6.2 Power-frequency response curve for RPPs of Category C ............................... 19 6.3 Procedure for setting and changing the power-frequency response curves for RPPs of Categories C ....................................................................................................... 21 7. Reactive Power Capabilities ......................................................................... 21 7.1 RPPs of Category A ............................................................................................... 21 7.2 RPPs of Category B ............................................................................................... 22 7.3 RPPs of Category C ............................................................................................... 24 8. Reactive Power and Voltage Control Functions.......................................... 26 8.1 Reactive power (Q) Control .................................................................................. 26 8.2 Power Factor Control ............................................................................................ 27 8.3 Voltage Control ...................................................................................................... 27 9. Power Quality ................................................................................................ 28 10. Protection and Fault levels ........................................................................... 30 11. Active Power Constraint Functions ............................................................. 31 11.1 Absolute Production Constraint .......................................................................... 31 11.2 Delta Production Constraint ................................................................................. 32 11.3 Power Gradient Constraint ................................................................................... 32 12. Control Function Requirements ................................................................... 33 13. Signals, Communications & Control ............................................................ 34 13.1 Signals from the RPP available at the POC ........................................................ 34 13.1.1 Signals List #1 – General ............................................................................................ 35 13.1.2 Signals List #2 – RPP Availability Estimates ............................................................... 35 13.1.3 Signals List #3 – RPP MW Curtailment Data .............................................................. 35 13.1.4 Signals List #4 – Frequency Response System Settings ............................................ 36 13.1.5 Signals List #5 – RPP Meteorological Data. ............................................................... 36 13.2 Update Rates .......................................................................................................... 37 13.3 Control Signals Sent from SO to the RPPs ......................................................... 37 13.3.1 Active-Power Control .................................................................................................. 37 13.3.2 Connection Point CB Trip facility................................................................................. 37 13.4 MW Forecast .......................................................................................................... 37 13.5 RPP MW availability declaration .......................................................................... 38 13.6 Data Communications Specifications ................................................................. 38 14. Testing and Compliance Monitoring ............................................................ 39 Page 3 Grid Connection Code for RPPs in South Africa - Version 2.8 July 2014 15. Reporting to NERSA ...................................................................................... 40 16. Provision of Data and Electrical Dynamic Simulation Models ................... 41 Appendices ............................................................................................................ 44 Appendix 1 - Wind ............................................................................................................. 45 A1.1 High Wind Curtailment ................................................................................................... 45 Appendix 2 - Photovoltaic ................................................................................................ 46 Appendix 3 - Concentrated Solar Power ......................................................................... 47 Appendix 4 - Small Hydro ................................................................................................. 48 Appendix 5 - Landfill Gas ................................................................................................. 49 Appendix 6 - Biomass ....................................................................................................... 50 Appendix 7 - Biogas .......................................................................................................... 51 Appendix 8 - Documentation ........................................................................................... 52 A8.1 Master Data ................................................................................................................... 52 A8.2 Technical Documentation .............................................................................................. 54 A8.2.2 Single Line Diagram Representation .......................................................................... 55 A8.2.3 PQ Diagram ................................................................................................................ 55 A8.2.4 Short-circuit data ......................................................................................................... 55 Appendix 9 – Compliance test specifications ................................................................ 58 Page 4 Grid Connection Code for RPPs in South Africa - Version 2.8 July 2014 1. Grid Connection Code Basis 1.1 Legislation (1) The legal basis for this grid connection code is specified in terms of the Electricity Regulation Act (Act 4 of 2006), as amended. (2) This Grid Connection Code for Renewable Power Plants (RPPs) connected to the electricity Transmission System (TS) or the Distribution System (DS) in South Africa has, on the date of approval by NERSA , superseded the Grid Code Requirements for Wind Energy Facilities Connected to the Distribution or Transmission Systems in South Africa. 1.2 Handling of Non-compliances and Deviations (1) Amendments, derogations or exemptions shall be processed as specified in the RSA Grid Code, as amended. 2. Objectives (1) The primary objective of this grid connection code is to specify minimum technical and design grid connection requirements for Renewable Power Plants (RPPs) connected to or seeking connection to the South African electricity transmission system (TS ) or distribution system (DS). (2) This document shall be used together with other applicable requirements of the code (i.e. the Grid Code, the Distribution Code and the Scheduling and Dispatch Rules), as compliance criteria for RPPs connected to the TS and the DS . 3. Scope (1) The grid connection requirements in this code shall apply to all RPPs connected or seeking connection to the TS or DS, the SO, as well as to the
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