Objective

function for maximizing load

function for minimizing compressor energy

function for minimizing economic costs

function for costing expansion of pipes and compressors: $\sum_{i \in ne_pipe} c_izp_i + \sum_{i \in ne_compressor} c_izc_i$

minium compressor power objective for transient OGF problem

transient objective for minimizing a linear combination of compressor power and load shed

minimum load shedding objective for transient OGF problem