Stephen described the innovative features of the new strategic investment module, MISER-SI which builds on the design applications of ‘maxi min’ and ‘mini max’.
MISER-SI has been designed to choose the optimal combination of schemes and the timing of their implementation satisfy demand at minimum cost. All the normal MISER functionality is available so that infrastructure and licence constraints plus other dependencies are taken fully into account.
Schemes related to the supply-side might include:
increased capacities of works, transmission mains, reservoirs
profiling of capacities over time
increased resource yields, new resources
new transmission links
Schemes may also be defined that impact on demand such as:
leakage reduction
demand controls at one or mode nodes
demand profiles over time related to control measures
New dependency rules as well as Capex and Opex costs arising from the scheme can be included. The cost objective has been extended to minimising the total present value of the chosen scheme/s, whilst meeting supply/demand and other specified optimization objectives.
Schemes can be grouped in various ways:
exclusive of others, i.e. if Scheme A chosen then cannot choose Schemes B or C
inclusive of others, i.e. if Scheme D chosen then must also choose Scheme E
dependencies - can be ordered or lagged to link the finish of one to the start of another, the start of one to the start of another, plus other dependencies between schemes
The MISER-SI output includes:
the selected programme of schemes
the projected spending plan
the optimal operating solution in terms of abstractions, works production, imports, exports, flows around the system
the long-run marginal cost, (LRMC), determined by comparing optimal solutions with and without the schemes
