Cfrgtkky

Suppose you can use {amsmath} package.
I write a one by myself, but some details are not very good. E.g. in the following Table(show only a small part), the word "Stage" is not in vertical-center as the original table shown in the above.

My code is here:

begin{center}

begin{small}

begin{sc}

begin{tabular}{llp{1.5cm}cp{2cm}}

toprule

textit{textbf{Stage}}-1 &  & ACPF newline converge & Over-limit Lines \

cline{1-1}

    & textit{Generation}-1 & $surd$  & 0 \

bottomrule

end{tabular}

end{sc}

end{small}

end{center}

• Your table is not so complex, but let me say frankly, I would reconsider it design again


• Context of your table is unknown, so it is hart to advise some its improvements


• Your code example use unknown environment sc, probably you like to have text in the small caps shape


• Environment small doesn't exist, to have small font size you should use small command after begin{center}
  


• The use of the makecell macro from the package with the same name can improve formatting of column headers


• 
  

  The following MWE (Minimal Working Example) only repair and slightly improve your code fragment ...

  
  
  

  documentclass{article}
  
  usepackage{array, booktabs, makecell}
  
  
  
  begin{document}
  
      begin{center}
  
  smallscshape         % <---
  
  begin{tabular}{lllcl} % <---
  
      toprule
  
  textit{textbf{Stage}}-1
  
      &                       &   makecell{ACPF\ converge}
  
                                          &   makecell{Over-limit\ Lines} \  % <---
  
  cline{1-1}
  
      & textit{Generation}-1 &   $surd$ & 0 \
  
      bottomrule
  
  end{tabular}
  
      end{center}
  
  end{document}
  
  

  
  

begin{center}

begin{small}

begin{sc}

begin{tabular}{m{1.5cm}lccl}

toprule

%textit{textbf{Stage}}-1 &  & ACPF newline converge & Over-limit Lines \

textit{textbf{Stage}}-1

    &                       &   makecell{ACPF \ Converge}

                                        &   makecell{Over-limit \ Lines} \

cline{1-1}

    & textit{Generation}-1 & Yes  & 0 \ 

%hhline{====}

hline

textit{textbf{Stage}}-2

    &                       &   makecell{ACPF \ Converge}

                                        &   makecell{Over-limit \ Lines} \

cline{1-1}

    & textit{Generation}-2 & Yes  & 0 \ 

hhline{====} \

textit{textbf{Result}}

    &        &    Win  & \

bottomrule

end{tabular}

end{sc}

end{small}

end{center}