Emergency reconfiguration and distribution system planning under the Single-Contingency Policy

Abstract

Abstract--Emergency reconfiguration can improve distribution systems' reliability by enabling load transfer among substations. Previous studies, although present its operation strategies, seldom explore emergency reconfiguration's effects on distribution system planning. This paper explores how reconfiguration affects planning decisions and what benefits reconfiguration can bring to distribution system planning. For this purpose, two specific planning problems, planning substation capacity and allocating transformers, are studied under the Single-Contingency Policy (SCP). LP models are developed to find the optimal decisions in above problems.The main implications of this paper are: (1) enabling reconfigurable feeders can increase reliability with lower capital investment and operational cost when comparing to reinforcing transformer capacity; (2) the max-load of individual substation depends on its neighboring substations' characteristics; (3) the reliability of a set of well interconnected substations depends on the max-shortage of one of its substations; and (4) allocating transformers according to distribution networks' reconfiguration capability can improve distribution systems' reliability.

Optimal allocation of distributed generation and remote control switches for reliability enhancement of a radial distribution system using oppositional differential search algorithm

“…However, ODS outperforms DS and DE in terms of simulation time. Table 9 shows that, for the multi-objective formulation, the average value of objective function obtained by ODS algorithm is close to the minimum value to a greater extent as compared to the average and 3,5,6,7,8,10,11,12,13,16,19,20,21,22,23,26,28,31 ,32 1041400 8069900 DS 0 -0 6999200 3, 6, 7, 11, 14, 15, 16, 20, 22, 23, 24, 27, 28, 29, 32 822162 7821362 ODS 0 -0 6768300 2,3 ,4,5,9, 12, 13, 15, 17, 20, 21, 23, 24, 25, 27, 28, 29, 31, 32 1041400 7809700 minimum values of DS algorithm and DE. This proves ODS to be better in terms of robustness.…”

“…Assis et al [15] proposed an optimisation methodology to allocate switches on radially operated distribution networks considering sectionalising and tie switches of different capacities, with manual or automatic operation schemes. Many studies have focused on network reconfiguration [16–20]. Kavousi‐Fard and Akbari‐Zadeh [21] proposed a multi‐objective improved shuffled frog leaping algorithm for network reconfiguration in order to optimise reliability indices and active power loss.…”

Heuristic optimisation for network restoration and expansion in compliance with the single‐contingency policy

“…The question of planning substations under the single-contingency scenario considering load transfer was first raised by Leung et al [2], who present a linear program (LP) to calculate optimal load reallocation and subsequently determine the optimal number of transformers in each substation. This approach was picked up by Wang et al [3], who also use LP to model the load transfer and study implications on service reliability.…”

Simultaneous optimisation of tie switches placement and reserve capacity margin of sub-transmission substations considering the conflict between short-term and long-term plannings

“…As mentioned earlier, studies which relate to reserve capacity margin of ST substations are rare regardless of vast studies in switching devices and load transferring capability. For example, the capacity of an ST substation was empirically analysed based on single-contingency policy (SCP), which assumes that adjacent ST substations should support one another when one of them is unavailable [11][12][13]. In addition to SCP for the determination of reserve capacity in ST substations, the capacity/load ratio is a popular and useful index in ST substations capacity planning [14,15].…”