Dir sir ,you can add sum other functions to your code to introduce an 
approximative linear constraits to the problem 

    Le jeudi 9 janvier 2020 à 01:22:01 UTC+1, Liang, Chen <[email protected]> 
a écrit :  
 
 Hello everyone,

I’m trying to solve an AC OPF with extra linear constraints on the line flows. 
To be more specific, it is an equality constraint with some linear combination 
of the line flows, say $\sum_{e\in E} f_e = constant$. 

I read the user manual and found that branch flows are not variables used in 
MATPOWER, and thus I need to add non-linear constraints (given that the 
variables are node related quantities). However, the implementation of 
non-linear constraints are not easy. Will there be an easier/systematical way 
to implement linear constraint on line flows?

Thanks in advance. Any help is appreciated.

Best,
Chen  

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