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Study of Current Unbalance Propagation Pattern and HV Systems Share of Downstream Networks

Mehrabian, Mohammad Amin | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54612 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. Electrical systems are prone to voltage or current unbalance due to unbalance loads or asymmetries in network elements such as untransposed lines. Voltage and current unbalance can cause malfunction or reduction in lifetime of different elements. Voltage unbalance has been studied in a variety of publications, due to its high importance and significant effects. However, current unbalance has not gained much attention despite its undeniable influence on transformers’ and line’s lifetime. Observing high values of current unbalance in LV systems is predictable and inevitable. On the other hand, HV systems must be much more balance due to their different structure and absence of large unbalance loads. However, LV systems can play their role as sources of unbalance in HV systems. In this study, a novel method for tracing sources of unbalance in downstream networks that inject current unbalance to upstream networks is proposed. For this purpose, downstream lines are modeled as unbalance loads in upstream network. Correlation between loads’ power and current unbalance index of lines is calculated. Correlations are calculated in different window sizes. As a result, we can estimate the period each certain modeled load injects unbalance to upstream network. Moreover, the magnitude of correlation coefficient indicates the effectiveness of each load and its share on unbalance in all lines of the network
  9. Keywords:
  10. Current Unbalance ; Correlation ; Unbalance Loads ; Untransposed Lines ; High Voltage Systems ; Downstream Networks

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