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Report RSE 17001173

Modeling developments for power transmission optimisation



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G. Ceresa (RSE SpA), A. L´Abbate (RSE SpA), V. Viscardi (RSE SpA) , R. Calisti (RSE SpA), M. Cazzol (RSE SpA)

RETE-TRA 2016 - Evolution and development of the power transmission network

The report describes the ongoing modeling developments relevant to ACRE++ and ACRE++DC software prototypes aimed at OPF (Optimal Power Flow) analyses for large-size composite systems, and to a graphic interface tool for the visualisation of results of grid studies. Several case studies and application examples are reported.

In a European electric power system featured by different changes in the latest years, a crucial challenge for transmission grid operators mostly (and critically) concerns the need to integrate into power grids a continuously increasing amount of electricity produced by variable renewable energy sources (RES) towards the decarbonisation targets set by the European Union energy policy.

In this sense, the development of adequate power infrastructures is of vital importance, also to realise the European Energy Union. This situation, which is rapidly evolving, in terms of transmission network expansion planning, poses the need for the availability of proper and robust simulation tools to support the optimal system development: these tools shall allow to precisely and adequately evaluate the impact of the transmission grid expansion in terms of economics, reliability and security of the system. Moreover, these tools shall be able to properly represent the different innovative technologies, either available or in a continuous progress trend, that can increase the flexibility of transmission systems and foster the integration of variable RES.

This context is the background in which the ongoing development of the ACRE++ tool is carried on by RSE in a Fortran environment. ACRE++ is an advanced tool able to perform a coupled active/reactive OPF (Optimal Power Flow) calculation to optimise large-size composite generation and transmission systems with mixed AC (Alternating Current) and DC (Direct Current) grids on a variable time horizon. By simulating the operation of the modeled system, ACRE++ is able to determine the optimal dispatch of active and reactive power for generating units, the related (active and reactive) power flows and the levels of current through all network elements, among others.

Moreover, the simplified version of ACRE++, named ACRE++DC, has been also developed: it is based on an active OPF featuring a DC representation of the transmission network and a quadratic model of grid losses.

In the present report, an important role is also played by the extensive and detailed description related to the ongoing development of a graphical interface, based on QGIS, for the visual representation of results of optimisation studies. Starting from the build-up of a graphical representation of the Italian 380 kV/220 kV transmission network, several different examples of cases, test elaborations and applications of network analyses visualisation are reported and detailed.

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