Browsing by Author "Mvungi, Nerey"

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    Fault detection and monitoring in secondary electric distribution network based on distributed processing
    (IEEE, 2018) Mnyanghwalo, Daudi; Kawambwa, Shamte; Mwifunyi, Rukia; Gilbert, Gilbert M.; Makota, David; Mvungi, Nerey
    Inefficient fault management is one of the major challenges facing the only electrical utility company, the Tanzania Electric Supply Company to ensure safe, reliable and efficient power supply in the electrical Secondary Distribution Network (SDN). Currently, faults management processes from detection to clearance are performed manually and therefore inefficient. There have been initiatives by utility electrical company to automate faults clearance in the transmission and primary distribution parts of the network using SCADA and DMS, which are largely centralized. However, due to the complexity and ubiquitous nature of the SDN, automation is still challenging. This study proposes a distributed processing architecture for automatic faults detection and monitoring for the Tanzanian electrical SDN as it has been identified to fit well in network monitoring compared to the centralized approach. The proposed architecture consists of remote sensing units, distributed central processing units, central monitoring and communication platform. The architecture was implemented and tested in live network at UDSM-Kijitonyama Campus and found to work well.
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    An improved backward/forward sweep power fow method based on network tree depth for radial distribution systems
    (SpringerOpen, 2021) Kawambwa, Shamte; Mwifuny, Rukia; Mnyanghwalo, Daudi; Hamisi, Ndyetabura; Kalinga, Ellen; Mvungi, Nerey
    This paper presents an improved load flow technique for a modern distribution system. The proposed load flow technique is derived from the concept of the conventional backward/forward sweep technique. The proposed technique uses linear equations based on Kirchhoff’s laws without involving matrix multiplication. The method can accommodate changes in network structure reconfiguration by involving the parent–children relationship between nodes to avoid complex renumbering of branches and nodes. The IEEE 15 bus, IEEE 33 bus and IEEE 69 bus systems were used for testing the efficacy of the proposed technique. The meshed IEEE 15 bus system was used to demonstrate the efficacy of the proposed technique under network reconfiguration scenarios. The proposed method was compared with other load flow approaches, including CIM, BFS and DLF. The results revealed that the proposed method could provide similar power flow solutions with the added advantage that it can work well under network reconfiguration without performing node renumbering, not covered by others. The proposed technique was then applied in Tanzania electric secondary distribution network and performed well