Setting transmission line out-of-step relays in complex power systems
| dc.contributor.author | Gole, Anand | |
| dc.contributor.examiningcommittee | Muthumuni, Dharshana (Electrical and Computer Engineering) | |
| dc.contributor.examiningcommittee | Perera, Nuwan (Electrical and Computer Engineering) | |
| dc.contributor.supervisor | Rajapakse, Athula | |
| dc.date.accessioned | 2023-09-03T00:26:49Z | |
| dc.date.available | 2023-09-03T00:26:49Z | |
| dc.date.issued | 2023-08-24 | |
| dc.date.submitted | 2023-08-24T21:46:38Z | en_US |
| dc.degree.discipline | Electrical and Computer Engineering | en_US |
| dc.degree.level | Master of Science (M.Sc.) | |
| dc.description.abstract | Large disturbance in power systems such as network faults, line switching, generator disconnections and rejection of large loads may result in a transient mismatch between the power generation and consumption that could lead to oscillations in the synchronous machine rotor angles. These oscillations, (referred to as power swings) can be damaging if they result in out-of-step (OOS) conditions. Power swings can result in unwanted relay operations that may further aggravate the disturbance leading to blackouts as the August 10, 1996, Western North America blackout. OOS protection can be employed to detect such power swings and strategically block certain protection elements to avoid undesired operations or trip and disconnect the network at specific points to minimize outages. Typically, OOS protection examines the measured impedance at the relay location to detect power swings and determine whether they result in OOS conditions. The settings for OOS relays are specific to the power system and relay location. The current practice of determining OOS relay settings is not an exact science and requires engineering judgement. There may be scenarios where a relay cannot perfectly protect against all out-of-step events without compromising the security. In this thesis, a general methodology which can be used to identify OOS relay settings is presented. It exploits the OOS relay models available in dynamic simulation programs to measure swing speeds and determine preliminary relay settings which are further refined to fit specific conditions. A test system developed in PSSE is used to test the proposed methodology with simulations performed in PSSE software. The settings found from the proposed methodology are further tested by applying to a detailed electromagnetic transient simulation performed in PSCAD software. | |
| dc.description.note | October 2023 | |
| dc.identifier.uri | http://hdl.handle.net/1993/37544 | |
| dc.language.iso | eng | |
| dc.rights | open access | en_US |
| dc.subject | Out-of-step protection | |
| dc.subject | Out-of-step protection relay settings | |
| dc.title | Setting transmission line out-of-step relays in complex power systems | |
| dc.type | master thesis | en_US |
| local.subject.manitoba | no |