PowrSym History
nPowrSym1
developed for TVA 1972-1985
nPowrSym2 developed by OSA 1985-1995¨Placed in public domain¨Foundation for PowrSym Plus (also called P+)
Hourly, chronological, probabilistic
Focus on pumped hydro optimization and thermal unit constraints
Variable head pumped hydro
Multi-area with contract path grid model
Faster computation methods
Detailed spinning and operating reserve models
LOLP and LOLE computations
Foundation for PROSYM
nPowrSym3 developed by OSA 1995-2011
¨Enhancement has been on-going¨Addition of NTC multi-area flow logic¨Unique features for modeling wind power, cogeneration and energy storage
Fuel contract logic
Power contract logic
Spot market transaction logic
Daily Operations logic and interface
Maintenance planning under uncertainty
Advanced Monte Carlo uncertainty algorithm
nPowrSym4 Nodal released in 2011
¨PTDF multi-area flow logic (Zonal or Nodal by Bus)¨Interface to transmission models¨Enhancements for multi-area adequacy studies using Monte Carlo uncertainty algorithm.