2018 Navigating DER Interconnection Standards & Practices Supplemental - Part I

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* 1. Please identify yourself.

Full Name

Company

Email Address

Phone Number

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* 2. Does IEEE Std 1547 specify voltage and frequency ride-through as a mandatory capability requirement for DER?

Yes, but voltage and frequency trip settings within “ranges of allowable settings” allow for coordination with distribution protection and safety. Tripping of DER by utility-owned relays outside these ranges should only be implemented on a temporary basis and be coordinated with the regional reliability coordinator.

No, a distribution utility may choose to deactivate voltage and frequency ride-through as they see fit.

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* 3. What are the different causes for ‘Trip’ of non-islanded and islanded DER?

There is no difference.

Non-islanded DER are tripped latest by the specified clearing times because voltage or frequency remaining outside specified limits indicated either a close-up fault or a system collapse.

Whereas, islanded DER are tripped after max. 2 seconds because the DER anti-islanding function detects an isolated distribution feeder.

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* 4. Why is DER ride-through of voltage and frequency disturbances required?

Because the loss of aggregate DER active power during or following a bulk system disturbance may aggravate the disturbance and cause a cascading effect that may negatively impact bulk system reliability.

Because DER active power infeed can trigger distribution protection schemes to isolate local distribution faults.

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* 5. Why may some distribution utilities not assign abnormal performance Category III to all inverter-based DER?

Because the ride-through capability requirements of Category III are too onerous.

Because the ‘ranges of allowable settings’ of Category III do not permit distribution protection engineers to require voltage trip clearing times similar to the values specified in the former IEEE Std 1547a-2014.

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* 6. Can the ‘Momentary Cessation’ ride-through mode be combined with abnormal performance Category II?

Yes, ‘Momentary Cessation’ is a valid ride-through mode in Category II’s ‘Permissive Operation’ region. If used with Category II, a voltage threshold below which ‘Momentary Cessation’ is required should be specified.

No, ‘Momentary Cessation’ is only a valid ride-through mode in Category III.

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* 7. What should be considered when specifying ‘preferred’ voltage trip settings for DER, i.e., voltage trip thresholds and clearing times? (check all that apply)

Bulk system reliability

Distribution grid safety

Geographic extent of a voltage sag at the bulk system level and the affected DER capacity

Voltage sag propagation from bulk system to distribution level

Normally-cleared transmission fault clearing times

Delayed-cleared transmission fault clearing times

Fault-induced delayed voltage recovery (FIDVR) at distribution level

Existing typical transmission reclosing practices/times

No, existing typical transmission reclosing practices/times are rather to be considered when specifying an unintentional islanding clearing time between 2 seconds and 5 seconds

Existing typical distribution reclosing practices/times

No, existing typical distribution reclosing practices/times are rather to be considered when specifying an unintentional islanding clearing time between 2 seconds and 5 seconds

Acceptable arc flash energy content

Acceptable unintentional islanding run-on times

No, acceptable unintentional islanding run-on times are rather to be considered when specifying an unintentional islanding clearing time between 2 seconds and 5 seconds

2018 Navigating DER Interconnection Standards & Practices Supplemental - Part I - Training Module 2

Quiz related to Training Module 2: DER Ride-Through Performance Categories and Trip Settings

Question Title

* 1. Please identify yourself.

Question Title

* 2. Does IEEE Std 1547 specify voltage and frequency ride-through as a mandatory capability requirement for DER?

Question Title

* 3. What are the different causes for ‘Trip’ of non-islanded and islanded DER?

Question Title

* 4. Why is DER ride-through of voltage and frequency disturbances required?

Question Title

* 5. Why may some distribution utilities not assign abnormal performance Category III to all inverter-based DER?

Question Title

* 6. Can the ‘Momentary Cessation’ ride-through mode be combined with abnormal performance Category II?

Question Title

* 7. What should be considered when specifying ‘preferred’ voltage trip settings for DER, i.e., voltage trip thresholds and clearing times? (check all that apply)