\documentclass{article}
\usepackage{amsmath}
\usepackage{xepersian}
\begin{document}
\begin{equation}
S(V)=\sum_{j=1}^n \min\limits_{i\in V} D_{ij} 
\end{equation}

\begin{equation}
\begin{aligned}
S(V)=\sum_{j=1}^n &\min D_{ij} \\
&i\in V
\end{aligned}
\end{equation}


\begin{align}
S(V)=\sum_{j=1}^n &\min D_{ij} \\
&i\in V \nonumber
\end{align}

\end{document}