Assessing Distribution Network Flexibility via Reliability-based P-Q Area Segmentation

TL;DR

This paper introduces a framework using P-Q area segmentation and MIQCP modeling to evaluate the flexibility and reliability of active distribution networks, aiding DSOs in optimal flexibility management.

Contribution

It presents a novel MIQCP-based approach for assessing distribution network flexibility considering reliability and network reconfiguration effects.

Findings

Optimal flexibility support identified for different FUs

Reliability of FUs quantified in the framework

Network reconfiguration impacts flexibility provision

Abstract

This paper proposes a framework to assess the flexibility of active distribution networks (ADNs) via P-Q area segmentation, considering the reliability of flexible units (FUs). A mixed-integer quadratically constrained programming (MIQCP) model is formulated to analyse flexible active and reactive power support at the interface with transmission networks, explicitly capturing the contributions and reliability of FUs that provide flexibility services within an ADN. The numerical simulations performed for a real 124-bus UK distribution network demonstrate the optimal flexibility provision by different FUs, as well as the corresponding reliability and the impact of network reconfiguration. Distribution system operators (DSOs) can use the proposed framework to identify critical units, select an adequate combination of flexibility volumes, and manage its reliability.