Tighter and more compact formulation of unit commitment equations
The aim is to speed up integer decisions using state-of-the-art UC formulations
- good source is http://www.optimization-online.org/DB_HTML/2018/11/6930.html and related work
- Covers e.g. unit state (on/off/start) variables, start costs, ramps, piecewise linear production costs
- We should identify which formulations we are using and how to change to a better configuration
- We should aim to make the configurations selectable (even so that different units can use different formulations as currently, but expanded)
Would partially address #13.