EnCompass Power Planning Software is capable of performing a full optimization of all resources within a market or utility control center, subject to transmission limits and a complete set of operating costs and constraints.
By utilizing Mixed Integer Programming, the software determines the best combination of resources to commit and the appropriate dispatch and storage levels for each interval of the operating day.
In addition to minimum uptime and downtime requirements, EnCompass can also cap the number of starts and shutdowns, and recognize costs and fuel requirements for hot, warm, and cold starts and shutdowns.
Heat rates and dispatch costs are set for any number of blocks, and any number of fuels may be defined. EnCompass will utilize the least-cost fuel, subject to minimum and maximum limits and blending restrictions. Dependency constrains and waste heat recovery allow combined cycle resources to be modeled as complete configurations or as individual components. Alternative operating modes are used to define different conditions for co-firing multiple fuels or operating emission reduction equipment. Resources may be assigned to multiple environmental programs,which may include mass-based emission allowances, rate-based emission rate credits, or renewable energy credits.
Regional ancillary service requirements are co-optimized along with area load to ensure enough resources are available for uncertain events. Ancillary services include supplemental reserves (both up and down), contingency reserves (with a spinning and non-spinning component), and regulation reserves (both up and down). Reserve regions may overlap so that subareas must maintain a minimum level of reserves in addition to market-wide requirements, or they may span multiple balancing authorities to provide reserve sharing.
Storage & Renewables
EnCompass will also co-optimize limited energy resources such as hydro, storage, and demand response with load shifting or “bounce back.” Storage may be paired with renewable projects to only charge when they generate, or can charge using any resource connected to the grid. Cycle depth penalties can also be used to reduce excessive cycling and extend the life of batteries. Intermittent renewable resources such as wind and solar may be modeled with daily profile shapes down to the 1-minute level. Excess generation that cannot be stored or sold will be curtailed, with the ability to set the priority of resources for curtailment and if costs should still be applied.
The detailed modeling in EnCompass is relied on for budgeting and rate case test year results.