Enhanced Flexibility Aggregation Using LinDistFlow Model with Loss Compensation

TL;DR

This paper improves flexibility aggregation in integrated transmission-distribution systems by analyzing errors in the LinDistFlow model and proposing a compensation method to enhance coordination accuracy.

Contribution

It introduces a novel compensation approach to correct LinDistFlow model errors, improving flexibility set accuracy for better system coordination.

Findings

The proposed method effectively reduces LinDistFlow approximation errors.

Simulation results show improved coordination efficiency in ITD systems.

The approach enhances data privacy while maintaining system performance.

Abstract

With the increasing integration of renewable energy resources and the growing need for data privacy between system operators, flexibility aggregation methods have emerged as a promising solution to coordinate integrated transmissiondistribution (ITD) systems with limited information exchange. However, existing methods face significant challenges due to the nonlinearity of AC power flow models, and therefore mostly rely on linearized models. This paper examines the inherent errors in the LinDistFlow model, a linearized approximation, and demonstrates their impact on flexibility aggregation. To address these issues, we propose an intuitive compensation approach to refine the LinDistFlow-based flexibility set. Simulation results demonstrate the effectiveness of the proposed method in efficiently coordinating ITD systems.