Canada (Alberta AESO) — ride-through requirements

The LVRT, HVRT, FRT envelopes a grid-scale battery must meet under Canada (Alberta AESO) (Canada), digitized breakpoint by breakpoint and checked against the clause it came from.

By Sergey Syrvachev — Director of Product Engineering, grid-scale BESS · 10+ GWh delivered

Part of: the grid-code ride-through chart — compare this against 63 other standards in 42 countries.

What this is, and is not. A reading aid compiled from the clause cited below — not a compliance document. The primary text governs. Every value here was read from a current primary source.

Breakpoints

Times are seconds from the start of the disturbance. Voltage is per-unit of nominal; frequency in hertz. An LVRT curve is a lower boundary (stay connected while voltage is on or above it), an HVRT curve an upper boundary, and FRT gives the band between its High and Low boundaries.

Event Duty Breakpoints Status
low-voltage ride-through (LVRT) ride-through 0.001s → 0 pu; 0.15s → 0 pu; 0.151s → 0.45 pu; 0.3s → 0.45 pu; 0.301s → 0.65 pu; 2s → 0.65 pu; 2.001s → 0.75 pu; 3s → 0.75 pu; 3.001s → 0.9 pu verified
high-voltage ride-through (HVRT) ride-through 0.001s → 1.2 pu; 0.2s → 1.2 pu; 0.201s → 1.175 pu; 0.5s → 1.175 pu; 0.501s → 1.15 pu; 1s → 1.15 pu; 1.001s → 1.1 pu verified
frequency ride-through (FRT) ride-through High: 0.1s → 61.7 Hz; 30s → 61.7 Hz; 30.001s → 61.6 Hz; 180s → 61.6 Hz; 180.001s → 60.6 Hz | Low: 0.1s → 57 Hz; 0.75s → 57 Hz; 0.751s → 57.3 Hz; 7.5s → 57.3 Hz; 7.501s → 57.8 Hz; 30s → 57.8 Hz; 30.001s → 58.4 Hz; 180s → 58.4 Hz; 180.001s → 59.4 Hz verified

Where these values come from

  • LVRT AESO ISO Rules Section 503.5 Voltage Ride-Through, Appendix 1 'Voltage Ride-Through Requirements', Low Voltage Ride-Through Duration table: '< 0.45 / 4 to 9 cycles', '< 0.65 / 0.30 seconds', '< 0.75 / 2.00 seconds', '< 0.90 / 3.00 seconds', '>= 0.90 / Continuous operation'; plus subsection 2(2)(c). Effective 2024-04-01.
  • HVRT AESO ISO Rules Section 503.5, Appendix 1, High Voltage Ride-Through Duration table: '>= 1.200 / Instantaneous trip', '>= 1.175 / 0.20 seconds', '>= 1.15 / 0.50 seconds', '>= 1.10 / 1.00 seconds', '< 1.10 / Continuous operation'. Also subsection 2(2)(a): continuous operation between 0.90 and 1.10 pu. Effective 2024-04-01.
  • FRT AESO ISO Rules Section 503.6, Appendix 1 'Trip Settings for Off-Nominal Frequency Protective Relays': High - '>=61.7 Instantaneous trip', '>=61.6 / 30', '>=60.6 / 180', '<60.6 Continuous operation'; Low - '<=57.0 Instantaneous trip', '<=57.3 / 0.75', '<=57.8 / 7.5', '<=58.4 / 30', '<=59.4 / 180', '>59.4 Continuous operation'. Contrast IESO Market Rules Appendix 4.2 Issue 16.0 category 1 'Off-Nominal Frequency Operation'.

Last checked against the source document on .

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