Research on Cluster Bi-level Planning Based on Virtual Substation for Weak Areas of Distribution Network

doi:10.12204/j.issn.1000-7229.2022.08.006

Abstract

Abstract:

The remote mountainous areas at the end of the distribution network are often regarded as weak areas of the distribution network due to insufficient power supply reliability. In order to improve the power supply reliability of such areas, the concepts and methods of virtual substation and cluster planning are introduced, and a bi-level location and capacity planning model based on virtual substation for distributed power sources and energy storage is proposed. The upper-level model takes the largest cluster efficiency index as the goal, and divides the weak areas of the distribution network into clusters from both structural and functional aspects, whose planning result is the division plan of each cluster. The lower-level model aims to minimize the annual comprehensive cost considering the user’s loss costs, and build virtual substations within each cluster, whose results are the access location and capacity of distributed power sources in the cluster, and the access capacity and power of energy storage devices. Focusing on the characteristics of the cluster planning model, a cost calculation method for users’ power outage loss considering island operation is proposed, and an iterative hybrid particle swarm algorithm is used to solve the problem. A typical scene with distributed small hydropower stations in Yunnan is taken as an example to verify the feasibility of the proposed model and the effectiveness of the solution method.

Key words: virtual substation, distribution network, reliability, weak area, cluster division, cluster planning

CLC Number:

TM73

LI Zhenkun, WANG Yilong, JI Liang, ZHANG Zhiquan. Research on Cluster Bi-level Planning Based on Virtual Substation for Weak Areas of Distribution Network[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(8): 53-65.

Figures/Tables 14

Fig.1 Distribution network structure with virtual substation

Fig.2 Architecture of the bi-level cluster planning model

Fig.3 Schematic diagram of the distribution network structure for reliability analysis

Fig.4 Main network structure

Fig.5 Diagram of reliability index calculation

Fig.6 The lower-level planning particle structure

Fig.7 Network structure of power distribution system in original planning area

Fig.8 Small hydropower output and load power situation on a typical day

Table 1

Fig.9 Cluster division result of the planning area

Table 2 The result of each plan

Fig.10 Reliability indexes of each plan

Fig.11 Voltage curves of the nodes of each plan in dry season

Fig.12 Iterative process of each plan

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