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Bruce + West Bottling

Bruce + West Bottling. The IESO Transmission System. The transmission system is made up of a number of circuits all of which have unique capabilities and thermal limitations.

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Bruce + West Bottling

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  1. Bruce + West Bottling

  2. The IESO Transmission System • The transmission system is made up of a number of circuits all of which have unique capabilities and thermal limitations. • Our generation dispatching tool is designed to recognize these limitations and dispatch resources appropriately in order to respect them. • These limitations at times lead to an inability to utilize available generation due to a lack of paths out of a region – Bottled Energy

  3. The IESO Transmission System • These values are dynamic and can change every 5 minutes based on temperature, wind speed, day/night etc... • Result of which are two schedules (constrained and unconstrained) • As these limitations are automatically respected there is no formal operating instruction for how to manage these limits. • In other words, no SCO exists for these sub-areas

  4. Circuit Thermal Ratings • The thermal capabilities of the circuits are provided to us from each circuit’s asset owner • Revised thermal limits, in the form of a lookup table are provided to the IESO for each circuit every hour to reflect current real time conditions.

  5. Bottling Estimates Bottled generation is normally calculated by zone whereby: Bottled Gen = Available Gen-Zonal Demand -Ability to leave Zone Zones are generally divided by transmission interfaces.

  6. BRUCE FABCW Bruce + West Transmission BLIP NBLIP MICH-ONT INTERFACE WEST SOUTH WEST

  7. Interface Limits FABCW is the Flow Away from the Bruce Complex + Wind FABCW limit is dependent on a number of factors including actual flow on the BLIP interface. This limit is required to preserve plant stability in the area as well as to protect against voltage collapse post contingency. BLIP is the Buchanan Longwood Input. BLIP flow 0 is generally limited to 3,000 MW and Negative BLIP (NBLIP) generally varies between 500 to 1,500 MW. Both limits are based on voltage limitations

  8. Interface Limits At times, the transmission capability internal to a zone may be more limiting than the interface limit. In these cases, the traditional methodology for measuring Bottling is not adequate This is the case in the West and thus the zone was divided into 4 sub-areas, each divided by a boundary. The traditional bottling equation is then applied to each individual sub-area.

  9. The WEST Each sub-area contains both generation and load.  ```  NBLIP  ≈ 500 - 1,500 MW  G G G G```` MICH-ONT L L L L Boundary Thresholds • 3,058 MW – 4,045 MW • 3,010 MW – 3,981 MW • 2,218 MW – 2,836 MW

  10. Bottling In The West • These four boundary thresholds are based on simulations done by the IESO. • The simulation was designed to maximize generation. • The boundary threshold values are the estimated maximum total generation that can be produced before a thermal limit of a circuit out of that sub-area begins to encroach on its limit. • These boundary threshold values are used as estimates for modelling purposes only.

  11. Bottling In The West • Because these boundary are a result of thermal restrictions, each boundary has a different threshold for a number of temperature ranges. • The threshold range is based on temperatures from -20°C to 35 °C and change by 5°C increments

  12. Boundary Thresholds

  13. Looking Forward • Transmission enhancements throughout the province • The shutdown of coal fired generation • Bottled numbers are expected to decrease

  14. Thank You! Questions?

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