I receive 20 error because of missing $ inserted. However. I put $ before and after each symbol.
Here is my code:
\documentclass[twocolumn]{article}
\usepackage{blindtext}
\begin{document}
\begin{table*}[htbp]
\centering
%\begin{threeparttable}
\caption{Summary of a state-based EMS}
\begin{tabular}{l|c|c|c}
\hline
Battery SOC & State & Load Power & Fuel cell reference power \\ \hline
SOC \textgreater 80 \% & 1 & $P_{load}$ \le $P_{FCmin}$ & $P_{FCmin}$ \\
& 2 & $P_{load}$ \le $P_{FCmin}$ + $P_{optdis}$ & $P_{FCmin}$ \\
& 3 & $P_{load}$ \le $P_{FCmax}$ + $P_{optdis}$ & $P_{FC}$ = $P_{load}$ - $P_{optdis}$ \\
& 4 & $P_{FCmax}$ + $P_{optdis}$ \textless $P_{load}$ & $P_{FCmax}$ \\ \hline
50\% \le $SOC$ \le 80\% & 5 & $P_{load}$ \le $P_{FCmin}$ & $P_{FCmin}$ \\
& 6 & $P_{load}$ \le $P_{FCopt}$ - $P_{BATopt}$ & $P_{load}$ \\
& 7 & $P_{load}$ \le $P_{FCopt}$ + $P_{BATopt}$ & $P_{FCopt}$ \\
& 8 & $P_{load}$ \le $P_{FCmax}$ & $P_{load}$ \\
& 9 & $P_{load}$ \textgreater $P_{FCmax}$ & $P_{FCmax}$ \\ \hline
SOC \textless 50\% & 10& $P_{load}$ \le $P_{FCmax}$ - $P_{optchar}$ & $P_{load}$ + $P_{optchar}$\\ & 11& $P_{load}$ \textgreater $P_{FCmax}$ - $P_{optchar}$ & $P_{FCmax}$ \\ \hline
\end{tabular}
\label{statebased}
%\end{threeparttable}
\end{table*}
\Blindtext\Blindtext
\end{document}
\le
. However, I'd maintain the math part in yourtabular
a little better using some help fromamsmath
's\text
.$P_{load}$ \le $P_{FCmin}$
should of course be$P_{load} \le P_{FCmin}$
. Better,$P_{\mathrm{load}} \le P_{\mathrm{FCmin}}$
. Your usage of\textgreater
and\textless
is similarly wrong: use a similar input as suggested with>
and<