Simplified three-phase lateral and feeder models for fast distribution system calculations |
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| Affiliation: | 1. School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China;2. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China;1. Joint Mass Spectrometry Centre, Chair of Analytical Chemistry, University of Rostock, Germany;2. Joint Mass Spectrometry Centre, Cooperation Group Comprehensive Molecular Analytics, Helmholtz Zentrum München – German Research Centre for Environmental Health, Germany;1. Servicio de Oncología Médica, Hospital Universitario de Salamanca, Salamanca, España;2. Instituto de Investigación Biomédica de Salamanca (IBSAL), Salamanca, España;3. Servicio de Medicina Interna, Hospital Universitario Río Hortega, Valladolid, España;4. Facultad de Medicina, Universidad de Valladolid, Valladolid, España;5. Facultad de Medicina, Universidad de Salamanca, Salamanca, España;1. Sifang Research Group, Department of Electrical & Electronic Engineering, University of NCEPU, Beijing, China;2. State Grid AC Project Construction Co., Beijing, China;3. Department of Electrical & Electronic Engineering, University of Nottingham, NG7 2RD, United Kingdom |
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| Abstract: | This paper introduces three simplified three-phase lateral models for fast distribution system calculations. The models can also be applied to model a feeder with short laterals, whose impedances are negligible. These models are formulated using three lumped individual phase loads to represent single-phase, three-phase unbalanced, and nonuniformly distributed loads along a lateral or feeder. Proposed voltage-drop and line-loss models are developed to accurately simulate the total series voltage drop at the end and the total copper loss of a given lateral, respectively. A hybrid model is then developed to simulate both voltage drop and line loss accurately. All of the proposed models are used to represent the unbalance features of a physical distribution system in which various transformer connections are presented. The proposed models are applied to a physical feeder of Taiwan Power Company (Taipower). The simulation results show that it is possible to simplify complicated laterals or feeders to simple equivalent models in the calculations of voltage profiles and line losses with negligible error, even if there are various transformer connection schemes in the lateral or feeder. |
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