Assessment of Alain Distribution Network Incidents and Lessons Learned

Rayees, A.M.; Dahmi, M. Al

doi:10.1049/cp.2017.0338

Cited by 1 publication

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“…17000 11/0.4 kV distribution substation to cover the nature and economic growth requirements referring to latest peak demand announced by AADC which reach around 2.6GW. However, there are two main indicators that measure customer satisfaction through continuity of supply which are System Average Interruption Duration Index (SAIDI) and System Average Interruption Frequency Index (SAIFI) [2]. In addition, the 11kV network is designed to be as ring achieving N-1 criteria by allocating the optimal location for the normally open point (NOP), which strengthens meeting one of distribution utility objective by achieving high level of quality of supply, referred as Security of Supply (SoS) in AADC, and minimize operational costs at the same time [3].…”

Section: Introductionmentioning

confidence: 99%

Parallel Operation for 11 kV Ring System with Normally Open Point at Distribution Networks in AADC

AlAhmad,

AlDahmi,

Rayees

2024

J. Phys.: Conf. Ser.

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Currently, Al Ain Distribution Company (AADC) 11 kV distribution circuits are electrically split by Normal Open Points (NOP)s. NOPs can be closed for load restoration in case of planned or unplanned outages. Also, changing the NOP locations helps in load shifting to achieve network optimization between adjacently located 33/11 kV primary substations. This paper discusses a new operation mode in medium voltage distribution power network of AADC at Al Ain area in the United Arab Emirates by introducing closed loops of parallel 11 kV feeders from different busbars or substations. This operation mode is intended to end the continuous debate of optimal NOP locations in addition to expected reduction in the required time for load restoration in case of failures at distribution (11/0.4 kV) substations. A detailed case study is performed to explore the achieved benefits and enhancements on load balancing, voltage profile, and power factor in medium voltage networks. On the other hand, the impact on load flow, protection scheme, and loading violation are evaluated. Furthermore, the proposed model is in line with the regulations of the Department of Energy (DoE), regulatory body in Abu Dhabi Emirate, and should fully comply with Electricity Distribution Code (EDC) of Security of Supply Standards. Accordingly, while the current used operation mode is still valid, it is found that closed loops arrangement can be only allowed for rings from same 33/11 kV substations feeding from same source with considerable protection limitations. Moreover, it was concluded that closed loops from different 33/11 kV Substations will result in load flow problems.

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Section: Introductionmentioning

confidence: 99%