OR-Tools integration

OR-Tools is an open-source software suite for optimization developed by Google. It is compatible with most of existing open-source & commercial solvers.
Antares Simulator uses OR-Tools as an interface, in order to ensure its own compatibility with multiple solvers.

Available solvers

These are the solver names and enum, defined in the OR-Tools API.

Linear optimization

OR-Tools solver name	Enum	Usage	Website
clp	CLP_LINEAR_PROGRAMMING	Free-to-use	https://github.com/coin-or/Clp
glpk_lp	GLPK_LINEAR_PROGRAMMING	Free-to-use	https://www.gnu.org/software/glpk
glop	GLOP_LINEAR_PROGRAMMING	Free-to-use	https://developers.google.com/optimization/lp/glop
highs_lp	HIGHS_LINEAR_PROGRAMMING	Free-to-use	https://highs.dev
pdlp	PDLP_LINEAR_PROGRAMMING	Free-to-use	https://developers.google.com/optimization/lp/pdlp_math
sirius_lp 1	SIRIUS_LINEAR_PROGRAMMING	Free-to-use	https://github.com/rte-france/sirius-solver
gurobi_lp	GUROBI_LINEAR_PROGRAMMING	Commercial	https://www.gurobi.com
cplex_lp	CPLEX_LINEAR_PROGRAMMING	Commercial	https://www.ibm.com/fr-fr/analytics/cplex-optimizer
xpress_lp	XPRESS_LINEAR_PROGRAMMING	Commercial	https://www.fico.com/en/products/fico-xpress-solver

Mixed real integer optimization

OR-Tools solver name	Enum	Usage	Website
scip	SCIP_MIXED_INTEGER_PROGRAMMING	Free-to-use	https://www.scipopt.org
glpk	GLPK_MIXED_INTEGER_PROGRAMMING	Free-to-use	https://www.gnu.org/software/glpk
cbc	CBC_MIXED_INTEGER_PROGRAMMING	Free-to-use	https://github.com/coin-or/Cbc
highs	HIGHS_MIXED_INTEGER_PROGRAMMING	Free-to-use	https://highs.dev
sirius 1	SIRIUS_MIXED_INTEGER_PROGRAMMING	Free-to-use	https://github.com/rte-france/sirius-solver
gurobi	GUROBI_MIXED_INTEGER_PROGRAMMING	Commercial	https://www.gurobi.com
cplex	CPLEX_MIXED_INTEGER_PROGRAMMING	Commercial	https://www.ibm.com/fr-fr/analytics/cplex-optimizer
xpress	XPRESS_MIXED_INTEGER_PROGRAMMING	Commercial	https://www.fico.com/en/products/fico-xpress-solver

Constraint optimization

OR-Tools solver name	Enum	Usage	Optimization type
bop	BOP_INTEGER_PROGRAMMING	Free-to-use	Boolean
sat	SAT_INTEGER_PROGRAMMING	Free-to-use	Boolean integer
knapsack	KNAPSACK_MIXED_INTEGER_PROGRAMMING	Free-to-use

Integration in Antares Simulator

Antares Simulator needs 2 types of solvers: * A linear solver * A mixed real integer solver

While the OR-Tools interface allows using multiple solvers, Antares restricts this usage.
The Antares Simulator user can select the solvers using the ortools-solver command-line option. Here are the allowed values:

ortools-solver	Linear solver	Mixed real integer solver
sirius (default)	SIRIUS_LINEAR_PROGRAMMING	SIRIUS_MIXED_INTEGER_PROGRAMMING
coin	CLP_LINEAR_PROGRAMMING	CBC_MIXED_INTEGER_PROGRAMMING
xpress	XPRESS_LINEAR_PROGRAMMING	XPRESS_MIXED_INTEGER_PROGRAMMING
glpk	GLPK_LINEAR_PROGRAMMING	GLPK_MIXED_INTEGER_PROGRAMMING
scip	SCIP_MIXED_INTEGER_PROGRAMMING	SCIP_MIXED_INTEGER_PROGRAMMING

The following commercial solvers are not yet supported by Antares Simulator, because of unmet pre-requisites:

ortools-solver	Linear solver	Mixed real integer	Waiting for
cplex	CPLEX_LINEAR_PROGRAMMING	CPLEX_MIXED_INTEGER_PROGRAMMING	Update OR-Tools building process for CPLEX support
gurobi	GUROBI_LINEAR_PROGRAMMING	GUROBI_MIXED_INTEGER_PROGRAMMING	Update OR-Tools building process for GUROBI support

---

1. SIRIUS solver is only supported in RTE's builds of OR-Tools. ↩↩