Over-Constrained Dispatch Rerun Process Document

The National Electricity Market Dispatch Engine (NEMDE) uses linear programming optimization method to solve a 5-minute dispatch run. To find a feasible solution, NEMDE utilizes the constraint violation penalty (CVP) factor to determine the constraint priority order. If a feasible solution cannot be found without violating one or more constraints, NEMDE selects the constraints to violate based on their order of merit. Consequently, the cost of violating one or more constraints can lead to a dispatch price that is either above the market price cap (MPC) or below the market price floor (MPF).

The Over-Constrained Dispatch (OCD) rerun process is triggered when above condition is observed. In this process, the right hand side (RHS) values of the violating constraints are relaxed and another NEMDE run is performed with the relaxed constraints. The objective of the rerun is to remove the constraint violation component from the pricing outcomes.

Over-Constrained Dispatch Rerun Process Document v1.2 29 Nov 2011 | filename: 0140-0056.pdf

For information regarding this documentation, please contact the AEMO Information Centre.