Generator Generation Non-anticipativity

Units:	$
Mode:	Input Only
Multi-band:	False
Default Value:	0
Validation Rule:	Any Value
Key Property:	No
Description:	Price for violating non-anticipativity constraints in scenario-wise decomposition mode

Generator Generation Non-anticipativity applies to multi-sample simulations with the Stochastic Method "Stochastic" i.e. stochastic optimization using scenario-wise decomposition. It is used to identify the non-anticipative Generation decisions, and can optionally be set in combination with Generation Non-anticipativity Time.

For all stochastic optimization problems, except SDDP, defining the property adds the following constraints to the formulation:

Generation_(s,t) = Generation_(s+1,t) ∀s < S

where:
s is the sample number
S = Stochastic Risk Sample Count

The property can take any value, but there are two special cases to consider:

Non-anticipative (value = -1): There is no recourse on the decisions for this generator inside the defined time. The non-anticipativity constraints (as above). The value of -1 in effect means a penalty of 'infinity' on the non-anticipativity constraints.
Recourse (value = 0): There is full recourse on the decisions. The non-anticipativity constraints are relaxed and the optimization is free to set the generation in each stochastic sample separately.

The property is commonly used in medium or long-term Rolling Horizon models to ensure that generation decisions do not anticipate future information e.g. hydro inflows. Note that is generally not necessary to define this for the SDDP stochastic algorithm.

Table 1: Generation Non-anticipativity Example
Generator	Property	Value	Units
A	Units	1	-
A	Max Capacity	200	MW
A	Generation Non-anticipativity	-1	$
A	Generation Non-anticipativity Time	12	h
B	Units	1	-
B	Max Capacity	100	MW
B	Generation Non-anticipativity	10000	$

For the example in Table 1 Generator "A" Generation is a non-anticipative (or first-stage in a two-stage stochastic optimization) decision for the first 12 hours and a recourse (second-stage) decision after that time, whereas Generator "B" is a non-anticipative decision for all periods but with a penalty of $10,000 if the constraint is violated.