Main 6300 html

Upgrade Compatibility
Changes
1. Enhanced Decomposition in Stochastic Hydro Modelling
2. Memory and performance improvement
Features
User Interface
New Inputs
New Outputs

Released: July 7, 2013
Previous Version: 6.208
Next Version: 6.301

This version will automatically upgrade any previous version 5 or version 6 database. You may need to check the upgrade notes of earlier releases for any compatibility issues.

Databases in 6.300 format will retro-grade without manual changes to 6.208.

The following are the changes to existing functionality between this version and 6.208:

A state-of-the-art enhancement has been introduced to the optimization of long-term storage by MT Schedule and ST Schedule. When Storage Decomposition Method = "Shadow Prices" and MT Schedule is run with Stochastic Risk Sample Count > 1 and Stochastic Method ="Scenario-wise Decomposition" or "Independent Samples" the decomposition is done by computing Bender's cuts describing the multi-dimensional water value surface (or "Future Cost Function"). This greatly improves the robustness of ST Schedule storage optimization and is similar to the approach used by traditional stochastic dual dynamic programming.

The simulation engine code has been improved and now consumes less memory on large databases.

This version introduces the integrated Gas and Electric model described in the Gas Modelling article. The Gas model is enabled throughout the simulation from capacity planning in LT Plan through to short-term optimization in ST Schedule. The integrated model co-optimizes electric and gas expansion and production decisions simultaneously.

The new Decision Variable class allows you to create generic variables in the mathematical programming problem in a similar way to Constraint for generic constraints. The feature supports linear and integer decisions and time-lagged coefficients, allowing you to create models of system components that are not part of the 'native' functionality.

The new Global class exposes a number of simulation-wide settings that were previously unavailable. It also implements user-defined Future Cost Function for hydro optimization.

Support for multi-stage stochastic optimization has been introduced. The scenario tree parameters are defined on the Global class and currently work with all production simulation related non-anticipativity constraints. See the Variable and Unit Commitment topics for details.

Model Interleaved simulation now works with any number of nested interleaved processes. For example, you can now run day-ahead, hour-ahead and real-time simulations in one interleaved simulation.

The generator class has been enhanced to support storage of heat for CHP plant. See the articles Combined Heat and Power and Heat Storage.

The fuel class now supports modelling of fuel inventory (stockpiles).

LT Plan now supports expansion of the transmission network with ac and dc lines. See the new property Type for details.

In portfolio optimization you can now define constraints on the level of 'risk' (variance in Net Profit) from a stochastic optimization. See the property Formulate Risk for details.

To improve decomposition of constraints such as hydro energy in models where ST Schedule is sub-hourly and particularly for very short dispatch intervals like 10 minutes, a new Constraint RHS Hour type has been introduced. You can define constraints of hour type but also, which are useful for sub-hourly modelling and also report summary data by hour, again useful for sub-hourly modelling.

The new Condition properties Step Hour Active From and Step Hours Active allow a Condition to activate depending on the hour number in a step. Since you can now combine Condition with Variable when defining a property this means that the values read in to a property can change mid-step, which allow you to change for example from an intra-day load forecast to day-ahead forecast. See the Unit Commitment article for details.

There are no significant changes to the user interface, but performance has been improved especially on large databases.

Please refer to the Class Reference for Gas Model inputs.

New inputs for the Electric model are:

Collection	Property	Relates To
Generator	Start Profile Range	Maximum range for4 [Start Profile]
Generator	Internal Volume Scalar	Storage volume scaling factor used internal to the mathematical program
Generator	End Effects Method	Method used to value or constrain end-or-period gas volumes.
Generator	Recycle Penalty	Penalty for violating the recycling constraint.
Generator	Decomposition Method	Method used to pass the optimal storage trajectory from one simulation phase to the next.
Generator	Decomposition Penalty a	Decomposition storage target penalty function 'a' term
Generator	Decomposition Penalty b	Decomposition storage target penalty function 'b' term.
Generator	Decomposition penalty c	Decomposition storage target penalty function 'c' term
Generator	Decomposition Penalty x	Decomposition storage target penalty function 'x' term.
Generator	Decomposition Bound Penalty	Penalty applied to violation of storage bounds when the decomposition implies possible violations.
Generator	Enforce Bounds	If the storage bounds are enforced.
Generator	Max Heat	Maximum heat allowed in storage
Generator	Min Heat	Minimum heat allowed in storage
Generator	Opening Heat	Initial heat in the storage
Generator	Heat Withdrawal Charge	Incremental cost of withdrawing heat from the storage
Generator	Heat Injection Charge	Incremental cost of injecting heat into the storage
Generator	Max Heat Withdrawal	Maximum amount of heat that can be withdrawn from the storage in a hour
Generator	Max Heat Withdrawal Hour	Maximum amount of heat that can be withdrawn from the storage in a hour
Generator	Max Heat Withdrawal Day	Maximum amount of heat that can be withdrawn from the storage in a day
Generator	Max Heat Withdrawal Week	Maximum amount of heat that can be withdrawn from the storage in a week.
Generator	Max Heat Withdrawal Month	Maximum amount of heat that can be withdrawn from the storage in a month
Generator	Max Heat Withdrawal Year	Maximum amount of heat that can be withdrawn from the storage in a year
Generator	Max Heat Injection Hour	Maximum amount of heat that can be injected into the storage in a hour
Generator	Max Heat Withdrawal	Amount of heat that must be withdrawn from storage
Generator	Min Heat Withdrawal	Amount of heat that must be withdrawn from storage
Generator	Min Heat Withdrawal Hour	Amount of heat that must be withdrawn
Generator	Min Heat Withdrawal Day	Amount of heat that must be withdrawn from storage each day
Generator	Min Heat Withdrawal Week	Amount of heat that must be withdrawn from storage each week
Generator	Min Heat Withdrawal Month	Amount of heat that must be withdrawn from the storage each month
Generator	Min Heat Withdrawal Year	Amount of heat that must be withdrawn from storage each year
Generator	Min Heat Injection	Amount of heat that must be injected into the storage
Generator	Min Heat Injection Hour	Amount of heat that must be injected into the storage each hour
Generator	Min Heat Injection Day	Amount of heat that must be injected into the storage each day
Generator	Min Heat Injection Week	Amount of heat that must be injected into the storage each week
Generator	Min Heat Injection Month	Amount of heat that must be injected into the storage each month
Generator	Min Heat Injection Year	Amount of heat that must be injected into the storage each year
Generator	Heat Loss	Rate at which heat is lost from storage
Generator	Generation Non-anticipativity	Price for violating non-anticipativity constraints in scenario-wise decomposition mode.
Generator	Generation Non-anticipativity Time	Window of time over which to enforce non-anticipativity constraints in scenario-wise decomposition
Generator	Pump Load Non-anticipativity	Price for Violating non-anticipativity constraints in scenario-wise decomposition mode
Generator	Pump Load Non-anticipativity Time	Window of time over which to enforce non-anticipativity constraints in scenario-wise decomposition
Fuel	Units	Flag if fuel exists
Fuel	Max Inventory	Maximum fuel allowed in stockpile
Fuel	Min Inventory	Minimum fuel required in stockpile
Fuel	Opening Inventory	Initial fuel in the stockpile
Fuel	Delivery	Fuel delivered to the stockpile
Fuel	Delivery Charge	Cost of delivering fuel to the stockpile
Fuel	Inventory Charge	Cost applied to closing inventory in the stockpile.
Fuel	Reservation Charge	Cost applied to unused inventory capacity in the stockpile
Fuel	Withdrawal Charge	Incremental cost of taking fuel from stockpile
Fuel	Max Withdrawal	Maximum amount of fuel that can be taken from stockpile
Fuel	Max Withdrawal Hour	Maximum amount of fuel that can be taken from stockpile in a hour
Fuel	Max Withdrawal Day	Maximum amount of fuel that can be taken from stockpile in a day
Fuel	Max Withdrawal Week	Maximum amount of fuel that can be taken from stockpile in a week
Fuel	Max Withdrawal Month	Maximum amount of fuel that can be taken from stockpile in a month
Fuel	Max Withdrawal Year	Maximum amount of fuel that can be taken from stockpile in a year
Fuel	Min Withdrawal	Amount of fuel that must be taken from stockpile
Fuel	Min Withdrawal Hour	Amount of fuel that must be taken from stockpile each hour
Fuel	Min Withdrawal Day	Amount of fuel that must be taken from stockpile each day
Fuel	Min Withdrawal Week	Amount of fuel that must be take from stockpile each week
Fuel	Min Withdrawal Month	Amount of fuel that must be taken from stockpile each month
Fuel	Min Withdrawal year	Amount of fuel that must be taken from stockpile each year
Storage	Units	Flag if Storage is in service
Storage	Loss Rate	Rate of loss due to evaporation, leakage, etc
Line	Repair Time Distribution	Distribution used to generate repair times (Auto, Constant, Uniform, Triangular, Exponential, Weibull, Lognormal, SEV, LEV)
Line	Repair Time Shape	Repair time function shape parameter (for Weibull, lognormal)
Line	Repair Time Shape	Repair time function scale parameter (for exponential, Weibull Lognormal, SEV, LEV
Line	Repair Time Scale	Repair time function scale parameter (for exponential, Weibull, lognormal ,SEV, LEV)
Company	Type	Line Expansion type
Company	Formulate Risk	If constraint should be formulated to bound company net profit risk
Company	Target Profit	Target net profit for risk constraints
Company	Acceptable Risk	Acceptable risk around target net profit
Decision Variable	Include in LT Plan	If the generic decision variable is modelled in the LT Plan phase.
Decision Variable	Include in PASA	If the generic decision variable is modelled in the PASA phase.
Decision Variable	Include in MT Schedule	If the generic decision variable is modelled in the MT Schedule phase.
Decision Variable	Include in ST Schedule	If the generic decision variable is modelled in the ST Schedule phase.
Decision Variable	Objective Function Coefficient	Objective function value of the generic decision variable
Decision Variable	Lower Bound	Lower bound of the generic decision variable
Decision Variable	Upper Bound	Upper bound of the generic decision variable
Variable	Sampling	Flag if random sampling should occur in the period
Global	FCF Constant	Future Cost Function: objective function constant term
Global	Sample Weight	Sampling: Weight applied to samples
Global	Tree Stage Count	Scenario Tree: Number of stages in the tree
Global	Tree Position Exp Factor	Scenario Tree: Controls the end positions of each stage
Global	Tree Leaves Exp Factor	Scenario Tree: Controls the number of samples in each stage
Global	Tree Stages Position	Scenario Tree: Position of each stage
Global	Tree Stages Leaves	Scenario Tree: Number of leaves in each stage
Fuel Companies	Share	Percentage share of ownership
Constraint Generators	Hours Down Coefficient	Coefficient of number of hours the generating unit has been off
Constraint Generators	Flexibility Up Coefficient	Coefficient of flexibility up
Constraint Generators	Flexibility Up Coefficient	Coefficient of flexibility up
Constraint Generators	Flexibility Down Coefficient	Coefficient of flexibility down
Constraint Generators	Ramp Flexibility Up Coefficient	Ramp Flexibility Down Coefficient
Constraint Generators	Ramp Flexibility Down Coefficient	Coefficient of ramp flexibility down
Constraint Generators	Withdrawal Coefficient	Coefficient of generator heat withdrawal
Constraint Generators	Injection Coefficient	Coefficient of generator heat injection
Constraint Generators	Net Profit Coefficient	Coefficient of net profit
Constraint Generators	Pool Revenue Coefficient	Coefficient of pool revenue
Constraint Generators	Net Revenue Coefficient	Coefficient of net revenue
Constraint Generators	Start & Shutdown Cost Coefficient	Coefficient of start and shutdown cost
Constraint Generators	Fixed Costs Coefficient	Coefficient of fixed costs
Constraint Fuels	Closing Inventory Coefficient	Coefficient of fuel stockpile closing inventory.
Constraint Fuels	Inventory Change Coefficient	Coefficient of change in fuel stockpile level.
Constraint Fuels	Delivery Coefficient	Coefficient of delivery to fuel stockpile.
Constraint Fuels	Withdrawal Coefficient	Coefficient of withdrawal from fuel stockpile.
Constraint Decision Variables	Value Coefficient	Coefficient of the variable sample value
Constraint Variables	Expected Value Coefficient	Coefficient of the variable expected value
Constraint Variables	Value Coefficient	Coefficient of the variable sample value
Constraint Variables	Error Coefficient	Coefficient of the variable sample error
Constraint Variables	Positive Error Coefficient	Coefficient of the positive sample error
Constraint Variables	Negative Error Coefficient	Coefficient of the negative sample error
Condition Zones	Load Coefficient	Coefficient of zone demand in condition
Condition Zones	Capacity Reserves Coefficient	Coefficient of zone capacity reserves in condition
Decision Variable Nodes	Net Injection Definition Coefficient	Coefficient of Decision Variable in Node net injection definition equation
Global Storages	FCF Shadow Price	Shadow price of water in storage in future cost function

Please refer to the class reference for Gas Model outputs
New outputs for the Electric model are:

Collection	Property	Relates To
Generator	Flexibility Up	Amount of additional generation that could be provided
Generator	Flexibility Down	Amount of generation that could be unloaded
Generator	Ramp Flexibility Up	Amount of unused ramp up capability
Generator	Ramp Flexibility Down	Amount of unused ramp down capability
Generator	VO&M Charge	Variable operation and maintenance charge
Generator	Heat Rate	Heat Rate at [Max Capacity]
Generator	Max Heat	Maximum heat allowed in storage
Generator	Min Heat	Minimum heat required in storage
Generator	Opening Heat	Heat in storage at the start of the period
Generator	Closing Heat	Heat in storage at the end of the period
Generator	Heat Withdrawal	Heat withdrawn from storage
Generator	Heat Injection	Heat injected into storage
Generator	Net Heat Withdrawal	Net of withdrawal and injection
Generator	Heat Loss	Heat loss from storage
Generator	Heat Withdrawal Cost	Cost of withdrawing heat from storage
Generator	Heat Injection Cost	Cost of injecting heat into storage
Generator	Heat Shadow Price	Shadow price of heat in storage
Generator Fuels	Transport Charge	Cost of transporting the fuel to the generator
Fuel	Max Inventory	Maximum fuel allowed in stockpile
Fuel	Min Inventory	Minimum fuel required in stockpile
Fuel	Opening Inventory	Initial fuel in the stockpile
Fuel	Closing Inventory	Final fuel in stockpile
Fuel	Delivery	Fuel delivered to the stockpile
Fuel	Withdrawal	Fuel withdrawn from the stockpile
Fuel	Net Withdrawal	Net of withdrawal and delivery
Fuel	Delivery Cost	Cost of deliveries to the stockpile
Fuel	Inventory Cost	Cost applied to closing inventory in the stockpile
Fuel	Reservation Cost	Cost applied to unused inventory capacity in the stockpile
Fuel	Withdrawal Cost	Cost of withdrawing fuel from stockpile
Fuel	Installed Capacity	Installed generation capacity
Emission Generators	Generation Production	Net production of the emission from generation
Emission Generators	Unit Start Production	Net production of the emission from unit start up
Storage	Working Volume	Working storage volume at the end of the period
Storage	Utilization	Storage utilization based on end volume
Storage	Working Utilization	Storage utilization based on working volume
Storage	Average Utilization	Average storage utilization based on end volume
Storage	Average Working Utilization	Average storage utilization based on working volume
Storage	Loss	Loss due to evaporation, leakage, etc
Reserve	Time-weighted Price	Time weighted average price of reserve
Gas Field	Initial Volume	Storage volume at the start of the period
Gas Field	End Volume	Storage volume at the end of the period
Gas Field	Production	Quantity of gas produced by the gas field
Gas Field	Production Cost	Cost of extracting gas from the field
Gas Field	FO&M Cost	Fixed operation and maintenance cost
Gas Field	Fixed Costs	Total fixed costs including amortized build costs
Gas Field	Shadow Price	Shadow price of gas in the field
Gas Field	Units	Flag if the gas field is in existence
Gas Field	Units Built	Flag if the gas field is built in this year
Gas Field	Build Cost	Cost of building the gas field
Gas Field	x	Pass-through value (summed in summary)
Gas Field	y	Pass-through value (summed in summary)
Gas Field	z	Pass-through value (averaged in summary
Gas Storage	Max Volume	Maximum volume of gas allowed in storage
Gas Storage	Min Volume	Minimum volume of gas allowed in storage
Gas Storage	Initial Volume	Storage volume at the start of the period
Gas Storage	End Volume	Storage volume at the end of the period
Gas Storage	Working Volume	Working storage volume at the end of the period
Gas Storage	Utilization	Storage utilization based on end volume
Gas Storage	Working Utilization	Storage utilization based on working volume
Gas Storage	Average Utilization	Average storage utilization based on working volume
Gas Storage	Average Working Utilization	Average storage utilization based on working volume
Gas Storage	Withdrawal	Quantity of gas withdrawn from the storage
Gas Storage	Injection	Quantity of gas injected into the gas storage
Gas Storage	Net Withdrawal	Net of withdrawal and injection
Gas Storage	Withdrawal Cost	Cost of withdrawing gas from the storage
Gas Storage	Injection Cost	Cost of injecting gas into the storage
Gas Storage	Production Cost	Total cost of injections and withdrawals
Gas Storage	Shadow Price	Shadow price of gas in the storage
Gas Storage	FO&M Cost	Fixed operation and maintenance cost
Gas Storage	Fixed Costs	Total fixed costs including amortized build costs
Gas Storage	Units	Flag if the gas storage is in existence
gas Storage	Units Built	Flag if the gas storage is built in this year
Gas Storage	Build Cost	Cost of building the gas storage
Gas Storage	Units Retired	Flag if the gas storage is retired in this year
Gas Storage	Retirement Cost	Cost of retiring the gas storage
Gas Storage	x	Pass-through value (summed in summary)
Gas Storage	y	Pass-through value (summed in summary)
Gas Storage	z	Pass-through value (averaged in summary)
Gas Pipeline	Flow	Quantity of gas extracted from the pipeline
Gas Pipeline	Max Volume	Maximum volume of gas allowed in the pipeline
Gas Pipeline	Min Volume	Minimum volume of gas allowed in the pipeline
Gas Pipeline	Initial Volume	Volume of gas stored in the pipeline at the start of the period
Gas Pipeline	End Volume	Volume of gas stored in the pipeline at the end of the period
Gas Pipeline	Production Cost	Cost of extracting gas from the pipeline
Gas Pipeline	FO&M Cost	Fixed operation and maintenance cost
Gas Pipeline	Fixed Costs	Total fixed costs including amortized build costs
Gas Pipeline	Units Out	Number out of units out of service
Gas Pipeline	Hours of Maintenance	Number of hours the pipeline is on maintenance
Gas Pipeline	Hours of Forced Outage	Number of hours the pipeline is on forced outage
Gas Pipeline	Service Factor	Proportion of pipeline capacity available
Gas Pipeline	Units	Flag if the gas pipeline is in existence
Gas Pipeline	Units Built	Flag if the gas pipeline is built in this year
Gas Pipeline	Build Cost	Cost of building the gas pipeline
Gas Pipeline	Units Retired	Flag if the gas pipeline is retired in this year
Gas Pipeline	Retirement Cost	Cost of retiring the gas pipeline
Gas Pipeline	x	Pass-through value (summed in summary)
Gas Pipeline	y	Pass-through value (summed in summary)
Gas Pipeline	z	Pass-through value (averaged in summary)
Gas Node	Demand	Demand at the gas node
Gas Node	Flow	Flow of gas through the node
Gas Node	Production Cost	Cost of flowing gas through the node
Gas Node	Hours of Shortage	Number of hours of shortage in supply of gas at the node
Gas Node	Shortage	Shortage of gas supply
Gas Node	Shortage Cost	Cost of gas supply shortages
Gas Node	Hours of Excess	Number of hours of excess supply of gas at the node
Gas Node	Excess	Number of hours of excess supply of gas at the node
Gas Node	Excess Cost	Cost of gas excesses
Gas Node	Shadow Price	Shadow price of gas at the gas node
Gas Node	FO&M Cost	Fixed operation and maintenance cost
Gas Node	Fixed Costs	Total fixed costs including amortized build costs
Gas Node	Units	Flag if the gas node is in existence
Gas Node	Units Built	Flag if the gas node is built in this year
Gas Node	Build Cost	Cost of building the gas node
Gas Node	Units Retired	Flag if the gas node is retired in this year
Gas Node	Retirement Cost	Cost of retiring the gas node
Gas Node	x	Pass-through value (summed in summary)
Gas Node	y	Pass-through value (summed in summary)
Gas Node	z	Pass-through value (averaged in summary)
Gas Demand	Demand	Gas demand
Gas Demand	Hours of Shortage	Number of hours of shortage in gas supply
Gas Demand	Shortage	Shortage of gas supply
Gas Demand	Shortage Cost	Cost of gas supply shortages
Gas Demand	Hours of Excess	Number of hours of excess supply of gas
Gas Demand	Excess	Excess of gas supply
Gas Demand	Excess Cost	Cost of gas excesses
Gas Demand	Net Demand	Gas demand net of shortages and excesses
Gas Demand	Cost	Cost of gas demand
Gas Demand	Price Paid	Price paid for gas demand
Gas Demand	x	Pass-through value (summed in summary)
Gas Demand	y	Pass-through value (summed in summary
Gas Demand	z	Pass-through value (averaged in summary)
Gas Zone	Production	Quantity of gas produced by the gas fields
Gas Zone	Demand	Gas demand
Gas Zone	Imports	Imports on gas pipelines
Gas Zone	Exports	Exports on gas pipelines
Gas Zone	Net Intercharge	Net exports on gas pipelines
Gas Zone	Initial Volume	Initial volume in gas storage
Gas Zone	End Volume	End volume in gas storage
Gas Zone	Hours of Shortage	Number of hours of shortage in gas supply
Gas Zone	Shortage	Shortage of gas supply
Gas Zone	Shortage Cost	Cost of gas supply shortages
Gas Zone	Hours of Excess	Number of hours of excess supply of gas
Gas Zone	Excess	Excess of gas supply
Gas Zone	Excess Cost	Cost of gas excesses
Gas Zone	Net Demand	Gas demand net of shortages and excesses
Gas Zone	Cost	Cost of gas demand
Gas Zone	Price Paid	Price paid for gas demand
Gas Zone	x	Pass-through value (summed in summary)
Gas Zone	y	Pass-through value (summed in summary)
Gas Zone	z	Pass-through value (averaged in summary)
Region	SRMC	Highest short-run marginal cost of running generators
Region	Annualized Build Cost	Annualized cost of generating units built
Region	Total Cost	Total of fixed and variable generation costs
Region	Levelized Cost	Levelized cost of electricity
Region	Fuel Inventory Cost	Cost of fuel stockpile.
Zone	SRMC	Highest short-run marginal cost of running generators
Zone	Annualized Build Cost	Annualized cost of generating units built
Zone	Total Cost	Total of fixed and variable generation costs
Zone	Levelized Cost	Levelized cost of electricity
Company	Fuel Inventory Cost	Cost of fuel stockpile
Company	Annualized Build Cost	Annualized cost of generating units built
Company	Total Cost	Total of fixed and variable generation costs
Company	Levelized Cost	Levelized cost of electricity
Company Fuels	Inventory Cost	Costs associated with fuel stockpile
Decision Variable	Value	Value of generic decision variable
Decision Variable	Reduced Cost	Reduced cost of the generic decision variable
Decision Variable	Cost	Total objective function contribution of generic decision variable
Decision Variable	Objective Function Coefficient	Objective function value of the generic decision variable
Decision Variable	Lower Bound	Lower bound of the generic decision variable
Decision Variable	Upper Bound	Upper bound of the generic decision variable
Decision Variable	Min Value	Minimum value of generic decision variable
Variable	Expected Value	Expected Vaue

PLEXOS 6.300 Release Notes

1. Upgrade Compatibility

2. Changes

2.1. Enhanced Decomposition in Stochastic Hydro Modelling

2.2. Memory and Performance Improvements

3. Features

3.1. Gas Model and Gas-electric Cooptimization

3.2. Decision Variable Class

3.3. Global Class

3.4. Multi-stage Stochastic Optimization

3.5. Multi-level Interleaved Simulation

3.6. Heat Storage

3.7. Fuel Stockpiles

3.8. AC Line Expansion

3.9. Constraints on Risk

3.10. Coefficients for Modelling Flexibility

3.11. Hour Constraint Types and Reporting

3.12. Condition Enhancements and Multiple Forecasts Support

4. User Interface

5. New Inputs

6. New Outputs