A refined general summation law for VU emission assessment in radial networks |
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| Affiliation: | 1. School of Electrical Engineering, Southeast University, Nanjing, People’s Republic of China;2. State Grid Jiangsu Electric Power Company, Nanjing, People’s Republic of China;1. LUNAM Université, Université de Nantes & IRCCyN UMR CNRS 6597, Nantes, France;2. University of Piraeus, Department of Business Administration, 80 Karaoli & Dimitriou St., 185 34 Piraeus, Greece;1. Department of Electrical Engineering and Automation, Aalto University, Espoo FI-00076 AALTO, Finland;2. Department of Energy Technology, Aalto University, Espoo FI-00076 AALTO, Finland;1. School of Computer Science and Technology, Harbin Institute of Technology Shenzhen Graduate School, HIT Campus Shenzhen University Town Xili, Shenzhen 518055, PR China;2. Shenzhen Key Laboratory of Internet Information Collaboration, Harbin Institute of Technology Shenzhen Graduate School, HIT Campus Shenzhen University Town Xili, Shenzhen 518055, PR China;3. Department of Computer Science, University of Moncton, Moncton, NB, Canada;4. Department of Computer Science and Information Engineering, National University of Kaohsiung, Kaohsiung, Taiwan, ROC;5. Department of Computer Science and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC;1. Federal University of Rio Grande do Sul, Osvaldo Aranha 103, Room 116, Porto Alegre, Brazil;2. Federal University of Pampa, Av. M. A. Gomes de Godoy 1650, Room 3125, Bagé, Brazil;3. University of Florida, 216 Larsen Hall, P.O. Box 116200, Gainesville, FL 32611-6200, United States |
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| Abstract: | Voltage unbalance (VU) management of power systems requires the development of well researched engineering practices to maintain acceptable VU levels while utilising the total VU absorption capacity of the power system. In this regard, IEC/TR 61000-3-13:2008 prescribes a VU emission allocation methodology based on a stochastic approach which uses a general summation law in order to aggregate numerous sources of unbalance to take into account their random variations. On the other hand, recent deterministic studies on VU emission assessment at the post-connection stage of unbalanced installations present a complex VU factor based approach to determine constituent components of the post-connection VU emission at a point of evaluation. The primary objective of the work presented in this paper is to develop statistical approaches for compliance assessment using the outcomes of the deterministic methodologies on VU emission assessment, thus refining the existing general summation law. A revised general summation law is established, introducing weighting factors to evaluate the influences made by different sources of unbalance separately, in order to assess VU emission in radial networks. |
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| Keywords: | Power quality Voltage unbalance Voltage unbalance emission assessment General summation law Network asymmetry Load asymmetry |
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