This suite of tools is adapted to the representation under uncertainty of integrated energy systems – involving multiple generation technologies and taking into account the availability of renewable resources, fuels and transport restrictions in transmission lines and pipelines. The various models use stochastic optimization techniques to solve operational and planning problems.

OptGen – Model for generation expansion planning and regional interconnections

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Is a computational tool for determining the least-cost expansion (generation and interconnections) of a multi-regional hydrothermal system. It represents details of the system operation taking into account inflow uncertainties, emission constraints, and minimum capacity constraints, among other features. It is used both by planners in environments with centralized and state-owned companies and by regulators and investors in modeling competitive environments.

Modeling Aspects:

The integrated expansion is formulated as a large scale mixed integer programming problem with the following features:

  • Flexibility of investment & operation steps (year, semester, quarter, month);
  • Investment decisions represented either by integer or continuous variables;
  • Optional and obligatory projects;
  • Sets of associated projects;
  • Sets of mutually exclusive projects;
  • Precedence constraints;
  • Minimum capacity constraints for different groups of technology and for different time intervals allowing to represent governmental energy policies;
  • Reference marginal cost calculation;
  • Environmental constraints: emission of greenhouse gases;
  • Fuel availability constraints;
  • Multiple scenario analysis;
  • Analysis of a complete or partial expansion plan defined by the user.

The solution is obtained using advanced MIP techniques and Benders decomposition.

System Characteristics

  • Full graphic interface in Windows operational system;
  • Integrated graph visualizer model;
  • Input and output files are CSV files that can be handled by Excel;
  • Data can be imported from either Super Olade Expansion Model - MODPIN or from SDDP, both developed by PSR;
  • Outputs include the optimal expansion plan (reinforcement schedule, installed capacity per stage, investment costs, disbursement schedule etc.) and detailed operating results.

Integration with SDDP

OPTGEN also has a built-in feature for joint use with SDDP, which is a detailed transmission constrained stochastic hydrothermal scheduling model developed by PSR.

Some Recent Applications

  • SEETEC Project for studying the infrastructure Development Plan & Regional Electricity Market Benefits in the Balkans Region 2003-2010. (eight interconnected countries, 30 GW of current energy demand and 5 GW of incremental demand forecast by 2010);
  • Venezuelan Generation and Transmission Expansion Plan 2002-2010 (20 GW of installed capacity - 65% hydro - and 10 interconnected regions);
  • Brazil Expansion Planning Study 2004-2015 ( 85 GW of installed capacity - 85% hydro, 27.5 GW of incremental demand forecast by 2015, 117 hydro plants, 108 thermal plants and 9 interconnected regions).