Pre-Selection of the Optimal Sitting of Phase-Shifting Transformers Based on an Optimization Problem Solved within a Coordinated Cross-Border Congestion Management Process

Endika Urresti-Padrón,Wojciech Jaworski,Marcin Jakubek,Michał Kłos

doi:10.3390/en13143748

Endika Urresti-Padrón, Wojciech Jaworski + Show 2 more

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https://doi.org/10.3390/en13143748

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Journal: Energies	Publication Date: Jul 21, 2020
Citations: 4	License type: CC BY 4.0

Affiliation: National Centre for Nuclear Research

Abstract

The current European policy roadmap aims at forcing the TSOs to coordinate remedial actions used for relieving the congestions in the synchronous power system. In this paper, an optimization problem for coordinated congestion management is described and its results obtained for a real European use cases created in the H2020 EU-SysFlex project are presented. First of all, these results prove the feasibility of a central optimization problem for the coordination of the cross-border congestion management process. Next, the formulated optimization problem is used to tackle the issue of planning the investments in phase-shifting transformers (PSTs), for the purpose of increasing the efficiency/decreasing the cost of congestion management. Finally, this paper introduces two optimization-based indicators for pre-selecting the investment sites, which may be used to support the decision makers aiming at decreasing the costs of coordinated congestion management.

Highlights

In the European cross-border congestion management process, taking place after settling the zonal day-ahead European energy market, TSOs cooperate to relieve congestions within the synchronous power system
Costly actions—shifting the operating points of generating units located in affected areas, reducing demand with DSR or, if other means fail, shedding load (which results in non-zero Energy Not Served (ENS)), non-costly actions—switching taps of phase shifting transformers (PSTs) or topology switching
As the input data used for obtaining the results presented in the article, we used a set of 24 scenarios developed as a part of the H2020 EU-Sysflex project [24,25,26], which cover a significant part of the Continental European synchronous power system in specific conditions, namely minimal inertia, maximal demand and minimal reactive power availability in selected countries

Summary

Introduction

In the European cross-border congestion management process, taking place after settling the zonal day-ahead European energy market, TSOs cooperate to relieve congestions within the synchronous power system. Congestions may be identified when the hourly settlements of the European zonal day-ahead energy market are mapped onto the power system model in nodal resolution, for which the power flow algorithm is applied, e.g., within a security assessment process. Costly actions—shifting the operating points of generating units located in affected areas, reducing demand with DSR (demand side response) or, if other means fail, shedding load (which results in non-zero Energy Not Served (ENS)), non-costly actions—switching taps of phase shifting transformers (PSTs) or topology switching (turning selected power system elements on or off by TSOs).

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