Matches in SemOpenAlex for { <https://semopenalex.org/work/W2103184064> ?p ?o ?g. }
- W2103184064 abstract "The significance of load modeling for voltage stability studies has been emphasized by several disturbances, which have taken place in the past years. They have shown that the loads in combination with other dynamics are among the main contributors of prolonged low voltage conditions, voltage instability and collapse in the power system. As a result of these disturbances new investigations have come up to better understand the nature of the load. However, power system loads keep being very difficult to model; the load generally aggregates a large number of individual components of different nature, different load dynamics are excited depending on the time frame of actuation and the type of disturbance affecting the system, and the load is highly dependent on external factors such as weather conditions. This thesis investigates the load-voltage characteristic during two different time scales, long-term over several minutes, and short-term covering ms to several seconds, for different sized disturbances, and its impact on the calculation of transfer limits and security margins in voltage stability studies. The accurate determination of transfer limits will be an increasingly important task to maintain the operational security and economic dispatch of the power system. The location of the stability limits and the determination of transfer limits depend on the load-voltage characteristic since load relief due to the load-voltage dependency results in larger transfer limits. Moreover, the importance of using dynamic load models instead of static ones in stability studies is highlighted in this thesis. Due to the large amount of electrical heating loads in Sweden and its effect on voltage stability, a dynamic load model with exponential recovery, previously proposed by Hill and Karlsson, [Karlsson and Hill, 1994], has been the starting point for the investigations. Field measurements from continuous normal operation at the 20 kV-level from a substation in Sweden have provided a large amount of data covering all seasons during the time period July 2001-June 2002, and have resulted in extensive, unique and interesting recordings of active and reactive load characteristic and its dependency with small voltage variations. The data have revealed the variation of the load parameters and their dependency with weather and season of the year. The work has also contributed to a better approach for the normalization of traditional reactive load models. Furthermore the load-voltage characteristic during large disturbances has been investigated based on field measurements of phase-to-phase faults in a non-effectively earthed 50 kV system in Sweden. Three-phase currents and voltages have been used to estimate the active and reactive power. The recordings exhibited voltage dips up to 30% in the positive sequence voltage. The severity of the disturbances accentuates the nonlinear behavior of the load; the active and reactive power rapidly increase after fault clearing to levels even above the pre-disturbance value due to the re-acceleration of motors. The full recovery of the voltage is delayed due to the re-connection of tripped load. Moreover, it is shown that traditional load models do not accurately reflect the load behavior during these disturbances, for voltage dips around 12 % or larger due to the nonlinearities. An alternative load model, which represents the nonlinearities, has been tested. The superior behavior is demonstrated with the field measurements. Finally, some guidelines for industry to better account for the load in future stability studies have been included as a corollary of this thesis. (Less)" @default.
- W2103184064 created "2016-06-24" @default.
- W2103184064 creator A5042563656 @default.
- W2103184064 date "2005-01-01" @default.
- W2103184064 modified "2023-09-25" @default.
- W2103184064 title "Dynamic Power System Load -Estimation of Parameters from Operational Data" @default.
- W2103184064 cites W1482578125 @default.
- W2103184064 cites W1518201996 @default.
- W2103184064 cites W1524707205 @default.
- W2103184064 cites W1526889594 @default.
- W2103184064 cites W1527458030 @default.
- W2103184064 cites W1538056276 @default.
- W2103184064 cites W1602240847 @default.
- W2103184064 cites W1630684802 @default.
- W2103184064 cites W1763243278 @default.
- W2103184064 cites W1769701575 @default.
- W2103184064 cites W1884591364 @default.
- W2103184064 cites W1918556036 @default.
- W2103184064 cites W1941081195 @default.
- W2103184064 cites W1968456332 @default.
- W2103184064 cites W1978789812 @default.
- W2103184064 cites W1983035063 @default.
- W2103184064 cites W2007882880 @default.
- W2103184064 cites W2027364201 @default.
- W2103184064 cites W2033571036 @default.
- W2103184064 cites W2038361787 @default.
- W2103184064 cites W2042297666 @default.
- W2103184064 cites W2043568106 @default.
- W2103184064 cites W2048409271 @default.
- W2103184064 cites W2049501310 @default.
- W2103184064 cites W2062841339 @default.
- W2103184064 cites W2063485288 @default.
- W2103184064 cites W2072305550 @default.
- W2103184064 cites W2075373489 @default.
- W2103184064 cites W2085405268 @default.
- W2103184064 cites W2094192524 @default.
- W2103184064 cites W2095935494 @default.
- W2103184064 cites W2096573937 @default.
- W2103184064 cites W2097415784 @default.
- W2103184064 cites W2100134099 @default.
- W2103184064 cites W2103389565 @default.
- W2103184064 cites W2104843837 @default.
- W2103184064 cites W2106935068 @default.
- W2103184064 cites W2114884401 @default.
- W2103184064 cites W2125659410 @default.
- W2103184064 cites W2128437892 @default.
- W2103184064 cites W2136545262 @default.
- W2103184064 cites W2149926079 @default.
- W2103184064 cites W2154724099 @default.
- W2103184064 cites W2155537657 @default.
- W2103184064 cites W2157617456 @default.
- W2103184064 cites W2159683369 @default.
- W2103184064 cites W2165305513 @default.
- W2103184064 cites W2166226698 @default.
- W2103184064 cites W2166773501 @default.
- W2103184064 cites W2169100047 @default.
- W2103184064 cites W2169935210 @default.
- W2103184064 cites W2411450459 @default.
- W2103184064 cites W251300613 @default.
- W2103184064 cites W2540325009 @default.
- W2103184064 cites W296139669 @default.
- W2103184064 cites W3136837693 @default.
- W2103184064 cites W326831998 @default.
- W2103184064 cites W93303346 @default.
- W2103184064 cites W2187792947 @default.
- W2103184064 cites W2188960656 @default.
- W2103184064 hasPublicationYear "2005" @default.
- W2103184064 type Work @default.
- W2103184064 sameAs 2103184064 @default.
- W2103184064 citedByCount "9" @default.
- W2103184064 countsByYear W21031840642012 @default.
- W2103184064 countsByYear W21031840642013 @default.
- W2103184064 countsByYear W21031840642014 @default.
- W2103184064 countsByYear W21031840642019 @default.
- W2103184064 countsByYear W21031840642020 @default.
- W2103184064 crossrefType "dissertation" @default.
- W2103184064 hasAuthorship W2103184064A5042563656 @default.
- W2103184064 hasConcept C112972136 @default.
- W2103184064 hasConcept C119599485 @default.
- W2103184064 hasConcept C119857082 @default.
- W2103184064 hasConcept C121332964 @default.
- W2103184064 hasConcept C127413603 @default.
- W2103184064 hasConcept C12839126 @default.
- W2103184064 hasConcept C154945302 @default.
- W2103184064 hasConcept C163258240 @default.
- W2103184064 hasConcept C165801399 @default.
- W2103184064 hasConcept C196226539 @default.
- W2103184064 hasConcept C207821765 @default.
- W2103184064 hasConcept C2775924081 @default.
- W2103184064 hasConcept C41008148 @default.
- W2103184064 hasConcept C47446073 @default.
- W2103184064 hasConcept C57879066 @default.
- W2103184064 hasConcept C62520636 @default.
- W2103184064 hasConcept C66938386 @default.
- W2103184064 hasConcept C67186554 @default.
- W2103184064 hasConcept C77715397 @default.
- W2103184064 hasConcept C89227174 @default.
- W2103184064 hasConceptScore W2103184064C112972136 @default.
- W2103184064 hasConceptScore W2103184064C119599485 @default.
- W2103184064 hasConceptScore W2103184064C119857082 @default.