What IBR plants must do for IEEE 2800 voltage ride-through
With design compliance under NERC Protection and Control standard PRC-029-1 starting October 1, 2026 for BES IBR facilities, IEEE 2800 voltage ride through and frequency ride-through keep inverter-based resources (IBRs) online through grid disturbances for solar, wind, and storage, using IEEE 2800 performance curves that are more stringent than the older PRC-024 requirements. Ride-through is one piece of IEEE 2800 compliance. Under PRC-029-1, compliance covers design evaluation and actual ride-through behavior during real disturbances, so every plant needs to know what its event data shows.
What is IEEE 2800 ride-through?
The NERC Glossary defines ride-through as “the plant/facility remains connected and continues to operate through voltage or frequency system disturbances.” IEEE 2800 places the requirements in Clause 7: voltage in 7.2, frequency in 7.3. Voltage and frequency ride-through have a “highly critical” rating in NYSRC’s implementation review because lack of ride-through can threaten system reliability.
IEEE 2800 voltage ride through at a glance
When grid voltage dips (low-voltage ride-through, LVRT) or spikes (high-voltage ride-through, HVRT), the inverter must stay connected and keep operating within a specified time-voltage curve rather than trip offline. Most IEEE 2800 requirements, ride-through included, apply at the plant level rather than at individual inverters.
Continuous, mandatory, and permissive operation regions
In continuous operation, the plant stays connected inside the normal envelope. Mandatory operation applies when voltage or frequency is outside the continuous envelope but inside the ride-through envelope; the plant must stay connected for the minimum ride-through time and keep exchanging current. The deepest dips fall in permissive operation, where a plant may continue exchanging current or enter current-blocking mode.
IEEE 2800 labels its highest overvoltage band “may ride through or may trip.”
LVRT and HVRT: what the bands require
IEEE 2800 writes voltage ride-through as tables of voltage bands, each paired with an operating mode and a minimum ride-through time. LVRT bands step down below the continuous envelope; HVRT bands step up above it. Separate tables apply to plants with and without ride-through-limiting auxiliary equipment.
Momentary cessation: when it is and is not allowed
IEEE 2800 requires IBRs to remain online during voltage disturbances and permits current blocking for severe dips at or below 0.1 per unit. That is the permissive region, where a plant may continue exchanging current or enter current-blocking mode.
PRC-029-1 defines a must ride-through zone that spans the continuous, mandatory, and permissive regions, and it bars momentary cessation in the continuous and mandatory regions. Current blocking in the permissive region is allowed only if necessary to avoid tripping.
Current injection during voltage ride-through
During low-voltage ride-through, IEEE 2800 gives priority to reactive current. The type and magnitude of injected current depend on the voltage conditions. Clause 7.2.2.3.4 sets the fault current injection requirements for IBR units, and some interpretation challenges remain.
Consecutive voltage deviations
The plant must ride through consecutive voltage deviations. The consecutive-deviation clause is under discussion for a future IEEE 2800 revision.
Frequency ride-through, ROCOF, phase angle jump, and transient overvoltage
Clause 7.3 covers frequency ride-through, including rate of change of frequency up to 5 Hz/sec and phase angle jumps up to 25 degrees. Transient overvoltage ride-through sits in Clause 7.2.3, which is also on the revision list.
Where ride-through is measured
The reference point depends on the applicable requirements:
Most IEEE 2800 requirements apply at the plant’s Point of Measurement by default. Most requirements sit at the Point of Metering or Point of Interconnection in NYSRC’s review. Under PRC-029-1, voltage is measured at the high side of the main power transformer.
IEEE 2800 ride-through vs NERC PRC-029
PRC-029-1 aligns with IEEE 2800 ride-through criteria in key areas, but compliance teams evaluate performance differently under each:
| Topic | IEEE 2800 | NERC PRC-029-1 |
|---|---|---|
| What it is | Industry standard, enforceable once an authority governing interconnection requirements (AGIR) adopts it | NERC reliability standard |
| Curves | Defines the ride-through performance curves | Uses IEEE 2800 performance curves, more stringent than PRC-024 |
| Evaluation | Performance requirements an AGIR adopts | Actual behavior from event data and validated models; PRC-024 focused on protection settings |
| Momentary cessation | Current blocking permitted in the permissive region | Barred in continuous and mandatory regions; permissive only to avoid tripping |
| Scope | Sets the ride-through performance requirements | Under one interpretation, PRC-029-1 disallows tripping in some low-voltage durations where IEEE 2800 permits it |
| Start dates | Set by the adopting authority | Design compliance: October 1, 2026 (BES); January 1, 2027 (Non-BES) |
FERC approved PRC-029-1 in Order 909 on July 24, 2025. PRC-028-1 (disturbance monitoring) and PRC-030-1 (analyze and mitigate unexpected output changes) apply alongside it.
Proving IBR ride-through compliance: event data and evidence
Under PRC-029-1, plant owners must demonstrate recorded ride-through behavior at the high side of the main power transformer during each disturbance.
- Capture event data at the high side of the main power transformer for every disturbance.
- Review each disturbance against the applicable voltage and frequency regions.
- Analyze any trip or output drop to find the cause.
- Fix the cause and document the mitigation.
- Keep the evidence package ready for an audit request.
PowerCompliance connects to plant historians, SCADA, inverter data feeds, and ISO connections.
- Evidence capture (steps 1–2): PowerCompliance continuously captures sequence-of-events (SER), fault, dynamic disturbance (DDR), and real power performance data and flags threshold breaches in real time.
- Analysis and mitigation tracking (steps 3–4): It routes analysis tasks and tracks each mitigation to completion with a full evidence trail. Plant fixes stay with your engineers.
- Audit readiness (step 5): Compliance teams use automated audit trails in a living audit package that is ready when an auditor asks.
- Security: SOC 2 Type II and aligned with NERC CIP.
FAQ
Ride-through requirements cover plant-level performance during voltage and frequency disturbances. Compliance teams need event data to evaluate that performance and retain evidence.
What does ride-through mean in IEEE 2800?
In the NERC Glossary’s wording, the plant remains connected and continues to operate through voltage or frequency system disturbances. IEEE 2800 covers voltage in Clause 7.2 and frequency in Clause 7.3. Most requirements apply at the plant level rather than at individual inverters.
What is IEEE 2800 voltage ride-through?
IEEE 2800 voltage ride-through is a set of voltage bands, each paired with an operating mode and a minimum time the plant must stay online. Plants with and without auxiliary-equipment limits, such as wind and solar respectively, get separate tables.
What is the difference between LVRT and HVRT?
LVRT covers dips below the continuous envelope, and HVRT covers spikes above it. In both, outside the permissive region, the plant must stay connected for each band’s minimum ride-through time. Reactive current gets priority during LVRT, and the deepest dips fall in the permissive region.
Is momentary cessation allowed under IEEE 2800?
Only in the permissive region. IEEE 2800 permits current blocking there, for severe dips at or below 0.1 per unit, and current exchange must continue in the mandatory region. Under PRC-029-1, momentary cessation is barred in the continuous and mandatory regions, and permissive-region current blocking is allowed only to avoid tripping.
How is IEEE 2800 ride-through different from NERC PRC-029?
IEEE 2800 is an industry standard; PRC-029-1 is an enforceable NERC reliability standard. IEEE 2800 becomes enforceable once an authority governing interconnection requirements (AGIR) adopts it. Under PRC-029-1, compliance teams use IEEE 2800 performance curves to evaluate design and actual behavior from event data; under PRC-024, they focused on protection settings.
When does PRC-029 ride-through compliance start?
Design compliance starts October 1, 2026 for BES IBR facilities and January 1, 2027 for Non-BES facilities. PRC-028-1 disturbance monitoring and PRC-030-1 analysis of unexpected output changes operate alongside it. FERC approved PRC-029-1 in Order 909 on July 24, 2025.
How do IBR owners prove ride-through compliance?
Your compliance team reviews each disturbance recorded at the high side of the main power transformer and retains the event data. The team analyzes and mitigates any trip. PowerCompliance captures that data and maintains a living audit package.
Next steps
From October 1, 2026, ride-through becomes an ongoing, data-driven obligation for BES IBRs, judged on recorded event data from each disturbance, and it sits inside broader IEEE 2800 compliance. To see PowerCompliance in action, Schedule a Demo.
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