A Fast and Accurate determination of the Feasible Operating Region for Aggregation of Distribution Grid Potentials using Linearized Optimization

authored by

Neelotpal Majumdar, Marcel Sarstedt, Lutz Hofmann

Abstract

Increased renewable penetration over the years result in the decommissioning of thermal power plants, that reliably contribute to ancillary service provision. In order to alleviate this deficiency, an increasing number of Distributed Energy Resources (DERs) are required to provide ancillary system services. The major share of the DERs are installed at the distribution grid level. Therefore, the medium and the low voltage grid level, that passively consumed electricity, are transitioning towards a more active role. Active distribution grid services to support the transmission level operation include, for example, frequency control, voltage control, congestion management. In order to evaluate the distribution grid potentials for ancillary service provision, an aggregation of potentials can serve as a bridge between the Transmission System Operators (TSO) and Distribution System Operators (DSO). The Feasible Operating Region (FOR) is an aggregation of the distribution grid active and reactive power flexibility (PQ- flexibility) potentials, subject to technical grid and device constraints. The FOR can be used by the network operators during planning of system support services. Over the years, different approaches for evaluating the FOR have been determined, considering mathematical optimization, stochastics and metaheuristic programming approaches. In this paper, strategies for a fast and accurate determination of the FOR using a linearized optimization are discussed. Results reveal the efficiency of the methods to aggregate distribution grid flexibility potentials by using linearized power flow equations.

Organisation(s)

Electric Power Engineering Section

Type

Paper

Publication date

2021

Publication status

Published

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy