A SNOP Capacity Planning Method Considering Network-loss Optimization Benefit and Investment Cost

doi:10.11930/j.issn.1004-9649.201911044

Abstract

Abstract: Soft normally open point (SNOP) has strong ability in distribution network power flow control, but its application in distribution network is limited due to its quite high investment costs. An optimal planning method is thus proposed with consideration of the network-loss reduction benefit and SNOP investment cost. Firstly, the operation scenarios of the distribution network are generated according to time-series based on the life cycle of SNOP. Based on the restrains of SNOP and system operation states, the network-loss reduction benefits of SNOP are quantitatively analyzed under different SNOP capacities. And then, the SNOP cost is analyzed according to the topologic structure of modular multilevel converter, and the relationship between SNOP capacity and cost is linearly fitted. At last, a planning scheme is proposed for optimal SNOP installation location and capacity allocation considering the balance between network-loss reduction benefit and SNOP investment cost in daily operations. Case study shows that, limited by the high investment and operation costs of SNOP, it is feasible to install one SNOP in a distribution network under most conditions.

Key words: active distribution network, power system planning, soft normally open point, network loss

HE Yingjing, SHEN Shuyi, HE Dong, ZHANG Jingrui, LI Fan, ZHU Keping, WANG Songyan. A SNOP Capacity Planning Method Considering Network-loss Optimization Benefit and Investment Cost[J]. Electric Power, 2020, 53(4): 32-40.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201911044

https://www.electricpower.com.cn/EN/Y2020/V53/I4/32

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