Estimating Operational Flexibility from Active Distribution Grids

Savvopoulos, Nikolaos; Hatziargyriou, Nikos D.

doi:10.1109/eem49802.2020.9221991

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…The determination of the aggregate flexibility curve of an ADG is a challenging problem and has recently re-ceived significant academic interest. The proposed aggregation methodologies can be classified into two groups: (i) Monte-Carlo-based approaches [14], [15], [16] and (ii) optimization-based approaches [17], [18], [19], [20], [21], [22], [23], [24].…”

Section: Introductionmentioning

confidence: 99%

An Effective Method to Estimate the Aggregated Flexibility at Distribution Level

Savvopoulos

Hatziargyriou

2023

IEEE Access

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The exploitation of flexibility services provided by distributed energy resources (DERs) located in the distribution grid becomes increasingly important for the secure and reliable operation of power systems. These resources are typically small-scale and located close to end-users, however their aggregated flexibility can offset the imbalance caused by the stochastic variations of the renewable power sources. This paper proposes a methodology to estimate with increased accuracy the available flexibility of DERs in an Active Distribution Grid (ADG) at the points of interconnection with the transmission system. An optimization-based approach is used to estimate the available maximum active and reactive power flexibility at each TSO-DSO substation for specific directions formed by constant active to reactive power ratios. In order to keep calculations manageable and calculate the available flexibility with high accuracy, the search directions are sampled from a distribution that is iteratively updated at each step. Three variations are proposed for the angle sampling, both in the angle domain and in the p-q domain. Each variation is tested on a modified 18-bus radial distribution system and its effectiveness and convergence is compared.

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Section: Introductionmentioning

confidence: 99%

An Effective Method to Estimate the Aggregated Flexibility at Distribution Level

Savvopoulos

Hatziargyriou

2023

IEEE Access

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“…Despite the strides that have been made, this area also has obstacles to overcome. Most works on LV network flexibility tend to aggregate resources with disregard of network constraints [17], oversize energy devices [18], employ sensitive data-driven approaches [19], or assume complete controllability of the network [20]. Active aggregators managing LV networks have also been proposed, though this assumes that LV feeders never encounter technical issues [21] or that they are represented through approximated models, i.e., sensitivity factors and linearized flows [22].…”

Section: Introductionmentioning

confidence: 99%

In Pursuit of New Real-Time Ancillary Services Providers: Hidden Opportunities in Low Voltage Networks and Sustainable Buildings

Avramidis

Capitanescu

Evangelopoulos

et al. 2022

IEEE Trans. Smart Grid

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Following recent EU directives, the penetration of smart sustainable buildings (SSBs) in low voltage (LV) networks is expected to drastically increase. This open ups opportunities for developing novel frameworks to coordinate the provision of ancillary services (AS) stemming from SSBs. In pursuit of investigating the extent of the previously untapped potential of LV networks, this work proposes, for the first time, the development of an SSB-driven MV-LV coordination framework for the provision of AS, inspired by industrial HV-MV AS schemes from the European landscape. Analytical formulations of passive and active ancillary schemes are first presented, in the form of mixed-integer nonlinear programming problems. Analytical reformulations and approximations are then proposed, to derive computationally lighter mixed-integer linear programming models. The real-time management of AS provision is based on a novel 3-stage, model predictive control approach, driven by the collaboration between distribution system operator and SSBs, the latter considering environmental and phase balancing aspects in their optimizations. Emergency situations with network violations are also considered. The approach is validated, tested, and compared to its predecessor, i.e., its past, cruder version, on a multi-feeder LV network containing different types of SSBs.

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A Holistic Approach to the Efficient Estimation of Operational Flexibility From Distributed Resources

Savvopoulos,

Hatziargyriou,

Laaksonen

2024

IEEE Open J. Power Energy

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Estimating Operational Flexibility from Active Distribution Grids

Cited by 6 publications

References 21 publications

An Effective Method to Estimate the Aggregated Flexibility at Distribution Level

An Effective Method to Estimate the Aggregated Flexibility at Distribution Level

In Pursuit of New Real-Time Ancillary Services Providers: Hidden Opportunities in Low Voltage Networks and Sustainable Buildings

A Holistic Approach to the Efficient Estimation of Operational Flexibility From Distributed Resources

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