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The Need for Water...

Load Management Projects at the Department of Water Affairs through an Integrated Systems Approach Chris Scheepers 15 August 2012. The Need for Water. South Africa is divided into 19 water catchment areas. Water is transferred to different areas and national key important instances. .

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The Need for Water...

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  1. Load Management Projects at the Department of Water Affairs through an Integrated Systems Approach Chris Scheepers15 August 2012

  2. The Need for Water... • South Africa is divided into 19 water catchment areas. • Water is transferred to different areas and national key important instances. Usutu-Vaal water scheme • Water needed for: • Agriculture • Municipalities • Power stations • Chemical processes(Sasol) • Mines

  3. Usutu-Vaal Government Water Scheme (GWS) Matla PS Secunda Standerton

  4. Usutu-Vaal GWS Pump Station and Clients • Pump Stations • Naauwpoort (Witbank); • Rietfontein (Secunda); • Grootfontein(CharlCilliers); • Grootdraai and Tutuka (Standerton); • Geelhoudboom; (Between Morgenstond- and Heyshope dam) and • Heyshope(Piet Retief). • Clients/Destinations • Duvha P/S (if needed) • Matla P/S (Kriel P/S) • Sasol and Rietfontein dam • Tutuka P/S and Grootfontein weir • Grootdraai- and Morgenstond dam • Geelhoutboom pump station

  5. Usutu-Vaal GWS Layout: Grootdraai (GD) Dam Supply • Grootdraai backup supply: • Heyshope- and • Geelhoutboom pump stations • Pump when GD is below minimum operating level (80%). • Usually during the winter/dry seasons.

  6. Usutu-Vaal GWS Layout: Client Supply • Installed Capacity • Tutuka (4x 1405 kW) • Grootdraai(4x 1650kW) • Grootfontein(1x 2200kW and 4x 2150kW) • Rietfontein(4x 3050 kW) • Target savings • 3.80 MW • 3.15 MW • 3.20 MW

  7. Usutu-Vaal GWS: Previous Control Philosophy • Relay logic control panels were used. • Limited remote control. • Limited condition monitoring available. • Limited monitoring of dam/reservoir levels. • Time of use (TOU) not taken into account. • No data trending was available.

  8. Load Shift Project: Usutu-Vaal GWS – Scope of Work Upgrades on Grootdraai, Grootfontein and Rietfontein: • Upgrade pumps to enable automatic control. • Upgrade centralise SCADA & include a REMS • Install additional communication infrastructure. • Monitor dam levels – GSM modems. • Control system to optimise load shifting potential.

  9. Usutu-Vaal GWS: New Control Philosophy • PLC panels allowed for remote control. • Previous control philosophy was used. • Pump station control updated – communication between pumps. • Detailed conditioned monitoring. • Dam levels monitoring by GSM modems. • Integrated control philosophy between the pump stations.

  10. Usutu-Vaal GWS: Introduced SCADA • New SCADA with condition monitoring.

  11. Usutu-Vaal GWS: Integration of pump stations • Grootdraai (GD) pump into Vlakfontein Canal to Grootfontein: • 24 hours with 1 GD pump • 11-12` hours with 2 GD pumps • Grootfontein pump water from forebay to Knoppiesfontein towers. • Water may not be spilled at the Grootfontein weir. 41 km Vlakfontein canal

  12. Usutu-Vaal GWS: Grootdraai Pump Station Results • Grootdraai pumps stopped at the following times: • 07h00 to 09h00 – To ensure water ‘shortage’ at Grootfontein. • 18h00 to 20h00 – Evening load shift. • Note: Tutuka pumps only stopped during evening peak. • Achieved load shift (3 months): 3.8 MW • 103% performance.(Load shift for Grootdraai and Tutuka)

  13. Usutu-Vaal GWS: Grootfontein Pump Station Results • The Grootfontein pumps were stopped: • From 06h00 due to evening load shift at Grootdraai. • 18h00 and 20h00 – Evening load shift. • Achieved load shift (3 months): 3.2 MW • 107% performance.

  14. Usutu-Vaal GWS: Rietfontein Pump Station Results • The Rietfontein pumps were only stopped during: • 18h00 and 20h00 – Evening load shift. • Achieved load shift (3 months): 6.34 MW • 198% performance.

  15. Conclusion • Large electrical loads were shifted out of the evening peak.(Average 3 month total of 13.4 MW) • The supply to the clients was not compromised. • The control philosophy was revised and updated. • The control between pump stations was successfully integrated. • Advanced condition monitoring are done by the SCADA. • Control allows for most efficient pump combinations to be operated. • Remote access is possible for maintenance, control and support. • Pumps were refurbished - not included in the initial contract.

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