Online Aggregation of the Flexibility Potential in Distribution Grids Using State Estimation

Muller, Sharon; Contreras, Daniel; Fruh, Heiner; Rudion, Krzysztof; Exner, C.; Haken, Alix von

doi:10.1049/icp.2021.2085

Cited by 6 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Time-coupling of flexibility provision is presented in [16] [18]. Research in [19] adopts an adapted version of the FOR determination in [12], for a time-based aggregation of flexibilities with grid state estimation. This addresses the reduced observability of distribution grids.…”

Section: Introductionmentioning

confidence: 99%

Linear Optimization Based Distribution Grid Flexibility Aggregation Augmented With OLTC Operational Flexibilities

et al. 2022

View full text Add to dashboard Cite

The research project "SiNED -System Services for secure electricity grids in times of advancing energy transition and digital transformation" acknowledges the support of the Lower Saxony Ministry of Science and Culture through the "Niedersächsisches Vorab" grant program (grant ZN3563) and of the Energy Research Centre of Lower Saxony."ABSTRACT Ancillary services e.g., voltage control, congestion management and frequency control, require to be compensated increasingly from the Distributed Energy Resources (DERs). DERs are predominantly wind and photo-voltaic power plants, the major share of which are installed at the distribution grid level. Therefore, the previously passive distribution grids require transformation towards a more active role. Provision of ancillary services from the distribution grid level, requires assessment of active and reactive power flexibility (PQ-flexibility) potentials. Furthermore, increased renewable penetration correlates to increased responsibility of the Distribution System Operators (DSOs) for assessing the flexibility potentials. An aggregation of distribution grid potentials, subject to technical grid constraints and technological power limitations, is termed as Feasible Operating Region (FOR) of the distribution grid. The FOR effectively serves as an interface between the DSOs and the Transmission System Operators (TSO), for flexibility exchanges and planning of ancillary services provision. The determination of the FOR is established in current research, using different algorithms e.g stochastic methods, meta-heuristic programming and mathematical optimization techniques. In this paper, an FOR determination algorithm using successive linear programming (sLP) is proposed and validated against established optimization approaches on a uniform medium voltage (MV) grid model. Comparisons reveal competitiveness with established methods and an added advantage of fast calculation times, suitable for real time assessments. Further enhancement of the FOR is proposed, by integrating discrete transformer tap-changing operational flexibilities using a successive mixed integer linear programming (sMILP). Results demonstrate an increase in the flexibility potential from the distribution grid.

show abstract

Section: Introductionmentioning

confidence: 99%

Linear Optimization Based Distribution Grid Flexibility Aggregation Augmented With OLTC Operational Flexibilities

et al. 2022

View full text Add to dashboard Cite

show abstract

Flexibility Aggregation Perimeter for Ancillary Services in Radial Distribution Systems

Casolino

Losi

2023

IEEE Access

View full text Add to dashboard Cite

The flexibility provided by prosumers is recognized as a key element for the management of the electrical grids, in particular distribution grids, in the changing scenario of electricity generation and consumption. The flexibility useful to Distribution System Operators (DSOs) is strongly local, and it is necessary to identify the busses of the grid where the flexibility can be usefully provided for a service requested by the DSO. For this purpose, the concept of flexibility perimeter is adopted; it is defined as a set of busses such that flexibility can be provided by any set of prosumers within it while the grid operation remains secure. The flexibility perimeter is a relevant concept for flexibility markets; in particular, for aggregators, since the flexibility provided by the prosumers within the perimeter can be offered as a single product to participants to electricity markets requiring grid services. The identification of flexibility aggregation perimeters for congestion-relief services in a radial grid is straightforward; for flexibility services intended to solve voltage profile problems, the identification of perimeters is not easy, even in radial grids. The paper proposes a method for the identification and evaluation of flexibility perimeters for grid services in radial distribution grids, based on the concept of Load Area; it can help decision-makers choose a compromise between technical and market efficiency of the aggregation perimeter dimension. For voltage This article has been accepted for publication in IEEE Access.

show abstract

Flexibility Procurement for Local Ancillary Services and Provider Aggregation Perimeter in Radial Distribution Systems

Casolino,

Greco,

Losi

2024

IEEE Access

View full text Add to dashboard Cite

Online Aggregation of the Flexibility Potential in Distribution Grids Using State Estimation

Cited by 6 publications

References 0 publications

Linear Optimization Based Distribution Grid Flexibility Aggregation Augmented With OLTC Operational Flexibilities

Linear Optimization Based Distribution Grid Flexibility Aggregation Augmented With OLTC Operational Flexibilities

Flexibility Aggregation Perimeter for Ancillary Services in Radial Distribution Systems

Flexibility Procurement for Local Ancillary Services and Provider Aggregation Perimeter in Radial Distribution Systems

Contact Info

Product

Resources

About