Laboratory investigation of an amplitude comparator based directional comparison digital protection scheme

Prakash, K.S.; Malik, O.P.; Hope, G.S.; Hancock, G.C.; Wong, Kyle

doi:10.1109/61.103663

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…In other words, the superimposed algorithm is based on the fault-generated components and is only influenced by the network impedance parameters. Therefore, power system load flow has minimum impact on the superimposed algorithm [37]- [39].…”

Section: A Superimposed Quantitiesmentioning

confidence: 99%

“…In the frequency-domain approach, measured currents pass through a mimic filter to eliminate the exponentially decaying dc component [39]. The mimic filter's design criteria for superimposed quantities may differ from mimic filters used for phasor-based elements and are often referred to as a replica impedance filter.…”

Section: A Superimposed Quantitiesmentioning

confidence: 99%

“…First, analog voltage and current measurements are digitized after anti-aliasing filters. The digital quantities are then processed through per phase delta filters [37]- [39], where ϕ is phase-a, b, or c, as shown in Fig. 4 (c).…”

Section: Proposed Relaymentioning

confidence: 99%

“…The ΔS method detected FWD's fault, but the sine wave crossed to the positive plane because of the current angle of dc offset. The ΔSr overcomes this issue using the equivalent source-impedance behind the relay terminal to account for the phase angle mismatch [37], [39]. The proposed ΔWd1 method provided a more secure result but introduced a one-millisecond delay caused by the DDSRF filter.…”

Section: Relaymentioning

confidence: 99%

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Time-Domain Protection Scheme for Microgrids With Aggregated Inverter-Based Distributed Energy Resources

Samkari

Johnson

2023

IEEE Access

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This paper proposes a time-domain-based protection scheme for radial and loop microgrid systems with inverter-based resources (IBRs), such as solar photovoltaic (PV) and type-4 wind turbines. The protection scheme is designed to function during both grid-interconnected and grid-isolated modes. The proposed scheme provides an ultra-high-speed sub-cycle directional element aided with low bandwidth communication between relays. Like directional comparison schemes, relays identify whether faults are inzone or out-zone. The directional element is based on time-domain superimposed quantities and Park's transformation algorithms. More specifically, the element calculates the superimposed positive-sequence direct component of transient energy during faults. Superimposed voltage and current quantities are calculated using delta filters and decoupled double synchronous reference frame (DDSRF) filters. The proposed filtering method improves the reliability of the superimposed directional element when IBRs are present. The protection scheme is evaluated on a modified IEEE 34-bus distribution system simulated using an electromagnetic transients program.

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Section: A Superimposed Quantitiesmentioning

confidence: 99%

Section: A Superimposed Quantitiesmentioning

confidence: 99%

Section: Proposed Relaymentioning

confidence: 99%

Section: Relaymentioning

confidence: 99%

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Time-Domain Protection Scheme for Microgrids With Aggregated Inverter-Based Distributed Energy Resources

Samkari

Johnson

2023

IEEE Access

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“…Current reversal frequently occurs on unfaulted lines because the breakers at both ends of the faulted line do not clear the fault simultaneously. Depending on the reversal sequence, the unfaulted line may be tripped if adequate delays are not incoiporated into the relay logic scheme [14].…”

Section: Directional Relayingmentioning

confidence: 99%