SPIRA
Methodologies and tools
The studies to plan medium-long term expansion of wide and complex electric power systems call for the utilization of specific computing tools having the basic features that follow:
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- analysis and comparison of several expansion alternatives
- probabilistic approach in system adequacy analysis and operation costing evaluation
- optimisation of system operation states
- detailed analysis of dynamic system performances under critical energy conditions.
For the entire execution of technical studies, a set of tools has been implemented into specific digital computation programs.
This set of programs is integrated into a HW/SW unique environment specifically oriented to system planning and operational planning analyses (see the here under figure).
The SW package to be used for steady-state analyses is called SPIRA; dynamic studies are executed through the network simulator, called SICRE, which allows the simulation of both transient stability and long term dynamics.
The SPIRA&SICRE Systems have been developed by CESI and extensively used for many other large planning projects.
Among other projects, SPIRA has been successfully used in systems interconnection studies such as the SYSTMED grid and the Interconnection of the Balkan Countries to the Central-Western European Pool UCTE.
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SPIRA System
Within the SPIRA environment a set of specific functions are available especially tailored for planning purposes:
Preliminary optimisation of the network expansion plan
Probabilistic analysis of network adequacy and probabilistic cost evaluation
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AC load flow analysis in the normal state with and without automatically-selected contingencies
Optimum active and reactive dispatching, considering contingencies and network constraints
Short circuit current levels in the network
Appraisal of "flicker" disturbances caused by arc furnaces
Current/voltage harmonic propagation analysis
Network equivalents for load flow and adequacy analysis
Network equivalents for short-circuit current assessment
Network equivalent impedance as a function of frequencies
All the functions may be friendly operated by users by means of fully interactive and graphic man machine interface as well as data base management utilities for the creation of the network model to be studied and for the presentation of the relevant results.
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