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Report RSE 18000038

Extension of the technical-economic comparison of the use of standard (reactive) or superconducting current fault limiters in different public and private power grid scenarios.

Report

2017

Request Document (2.91 MB, .pdf)

M. Bocchi (RSE SpA), G. Angeli (RSE SpA), L. Serri (RSE SpA)

MON4-GRID 2017 - Management, monitoring and control of the transmission grid

Using the previously developed calculation tools, it was possible to extend the quantitative technical-economic comparison between different methods for the limitation of short-circuit currents in electrical networks to different situations. In particular, the use of a traditional technology, represented by the air limiting reactors, and of an innovative technology, consisting of SFCL (Superconducting Fault Current Limiter) in a network with a given configuration according to the variation of the factor, was evaluated. of limitation, of the nominal current and of the ratio between active and reactive power in the network itself.

Starting from the models and the tools previously developed, it was possible to conduct a technical-economic comparison between different methods for limiting the short-circuit currents in the electrical networks according to the variation of three parameters: the limiting factor, the nominal current and the ratio between active and reactive power in the chosen grid. In particular, the use of a traditional technology, represented by air limiting reactors, and the use of an innovative technology, consisting of SFCL (Superconducting Fault Current Limiter), is considered.
The comparison was conducted taking into account the following general criteria:

• the two technologies were compared on the same power grid, having a predetermined topology and parameters;

• the two technologies have been compared with the same net effect on the grid, ie with the same short-circuit current limitation factor;

• the most significant economic aspects related to the use of the two technologies in the grid were considered. An assessment of capital and operating costs for both the technologies was performed and the differential simple payback time was calculated.

Starting from the results of the 30 case studies already conducted - which provided for both types of FCL the sizing parameters, the grid load-flow in operation and in short circuit and related economic evaluations - fixing the standard tariff in force, technical-economic evaluations were carried out varying in one case the nominal current and in another case the ratio between active and reactive power in the grid.

The results obtained from these specific applications show once again that the methodology, the models and the software developed allow to perform a quantitative, parametric and homogeneous comparison between the two technologies and confirm the high potential and versatility of this tool for the execution of comparisons varying a large number of parameters concerning not only the technology, but also the configuration of the network and the economic aspects.

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