deletions | additions       diff --git a/section_Power_grid_models_Benjamin__.tex b/section_Power_grid_models_Benjamin__.tex  index c29cf28..57af5d3 100644  --- a/section_Power_grid_models_Benjamin__.tex  +++ b/section_Power_grid_models_Benjamin__.tex 
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- static load flow models - super simplified models (e.g.~Europe=copper  plate{}DC flow model) - Minimal dynamical model: Swing equation  \subsubsection{Derivation of swing equation  (Xiaozhu)}\label{derivation-of-swing-equation-xiaozhu}  Energy conservation leads to swing equation