Network clustering for voltage control in active distribution network including energy storage systems

Abstract

Abstract-This paper presents a network partitioning strategy for the optimal voltage control of Active Distribution Networks (ADNs) by means of Dispersed Energy Storage Systems (DESSs). The proposed partitioning is based on the concept of voltage sensitivity coefficients and is adopted for a decentralized voltagecontrol strategy specifically developed for radial ADNs. The aim of the partitioning is to decompose the network into quasiautonomous areas and to limit the information exchange only at the interfacing nodes between adjacent areas. The information exchange relies on Thévenin equivalents to represent the external grids of each cluster/area. The effectiveness of the proposed decentralized control approach is assessed with respect to an equivalent centralized control approach. Such an assessment is carried out using a numerical example referring to IEEE 123 buses distribution test feeder suitably adapted to include stochastic generation and DESSs.

An adaptive model-based real-time voltage control process for Active Distribution Networks using Battery Energy Storage Systems

“…In a previous work [4], the Authors of this manuscript have proposed a similar control process where DESSs have been used for the grid voltage control. In that preliminary work, the DESSs have been modeled as ideal energy reservoirs and their dynamic behavior was not taken into account.…”

“…In that preliminary work, the DESSs have been modeled as ideal energy reservoirs and their dynamic behavior was not taken into account. In this paper, an adaptive model-based control (MBC) relying on the accurate dynamic representation of BESSs is proposed and compared with the equivalent controller of [4]. For this purpose, an experimentally-fitted two-time constant dynamic model of Lithium-Titanate battery, is used.…”

Decentralized voltage control of clustered active distribution network by means of energy storage systems

“…Several methods have been proposed in the literature to overcome this issue including centralized and decentralized schemes [5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

“…A possible solution is to move from the centralized operation paradigm to the decentralized one by subdividing the network into quasi-autonomous entities defined as areas, zones or clusters (these terms are used as synonyms in the rest of the paper). To this end, starting from the work presented in [6], this paper first discusses the network clustering and, then, two consequent decentralized control strategies. Both network clustering and decentralized controls make use of a linear programming technique relying on the so-called voltage sensitivity coefficients (e.g., [7][8][9][10]).…”

Zoning Evaluation for Voltage Optimization in Distribution Networks with Distributed Energy Resources

“…In each VCZ a centralized control is present whereas the coordination is obtained by a distributed control among the PNs. This approach guarantees the optimal solution for each VCZ and it requires a communication infrastructure lighter than the centralized control [11,12].The division of the network in VCZs require the definition of an electrical distance, a clustering criterion and, in some case, a clustering quality index [13]. In literature, various measures of the electrical distance have been proposed, based on geographical distance, line impedance, voltage sensitivity coefficients [14] and the most commonly used involves the sensitivity of the nodal voltages to the reactive power injections [13,[15][16][17][18][19][20][21].…”