\documentclass[journal]{IEEEtran}
\hyphenation{Smart Grid}
\usepackage[classicReIm]{kpfonts}
\usepackage{siunitx,booktabs}
\begin{document}
\begin{table*}
\centering
\caption{Analysis}
\label{tab:M_CPE}
\setlength{\tabcolsep}{0pt}
\begin{tabular*}{\textwidth}{
@{\extracolsep{\fill}}
S[table-format=2.0]
*{10}{S[table-format=1.2]}
@{}
}
\toprule
& \multicolumn{9}{c}{Proposed and existing forecast models} \\
\cmidrule{3-10}
{Hours} &
{Target} &
\multicolumn{2}{c}{FCRBM} &
\multicolumn{2}{c}{AFC-STLF} &
\multicolumn{2}{c}{Bi-level} &
\multicolumn{2}{c}{MI-ANN} \\
\cmidrule{3-4}\cmidrule{5-6}\cmidrule{7-8}\cmidrule{9-10}
& {P.load(kW)} & {MAPE(\%)}
& {P.load (kW)} & {MAPE(\%)}
& {P.load (kW)} & {MAPE(\%)}
& {P.load(kW)} & {MAPE(\%)} \\
\midrule
1 & 1.10 & 1.03 & 0.78 & 2.13 & 1.46 & 0.78 & 2.27 & 1.30 & 0.73 \\
2 & 1.44 & 0.95 & 0.67 & 2.17 & 1.47 & 0.60 & 2.15 & 1.45 & 0.48 \\
\midrule
{Avg.} & 1.10 & 1.03& 0.79 & 2.20 & 1.25 & 0.65 & 2.10 & 1.35 & 0.60 \\
\bottomrule
\end{tabular*}
\end{table*}
\end{document}
Responder1
Deve haver duas células vazias na terceira linha da tabela, mas você está inserindo apenas uma.
Além disso, as colunas são dez, em vez de onze, conforme definido.
Eu mudei (kW)
para o correto (\si{\kilo\watt})
.
\documentclass[journal]{IEEEtran}
\usepackage[classicReIm]{kpfonts}
\usepackage{siunitx,booktabs}
\begin{document}
\begin{table*}
\centering
\caption{Analysis}
\label{tab:M_CPE}
\setlength{\tabcolsep}{0pt}
\begin{tabular*}{\textwidth}{
@{\extracolsep{\fill}}
S[table-format=2.0]
*{9}{S[table-format=1.2]} % 9, not 10
@{}
}
\toprule
& \multicolumn{9}{c}{Proposed and existing forecast models} \\
\cmidrule{3-10}
{Hours} &
{Target} &
\multicolumn{2}{c}{FCRBM} &
\multicolumn{2}{c}{AFC-STLF} &
\multicolumn{2}{c}{Bi-level} &
\multicolumn{2}{c}{MI-ANN} \\
\cmidrule{3-4}\cmidrule{5-6}\cmidrule{7-8}\cmidrule{9-10}
& % <---- this was missing
& {P.load (\si{\kilo\watt})} & {MAPE (\%)}
& {P.load (\si{\kilo\watt})} & {MAPE (\%)}
& {P.load (\si{\kilo\watt})} & {MAPE (\%)}
& {P.load (\si{\kilo\watt})} & {MAPE (\%)} \\
\midrule
1 & 1.10 & 1.03 & 0.78 & 2.13 & 1.46 & 0.78 & 2.27 & 1.30 & 0.73 \\
2 & 1.44 & 0.95 & 0.67 & 2.17 & 1.47 & 0.60 & 2.15 & 1.45 & 0.48 \\
\midrule
{Avg.} & 1.10 & 1.03& 0.79 & 2.20 & 1.25 & 0.65 & 2.10 & 1.35 & 0.60 \\
\bottomrule
\end{tabular*}
\end{table*}
\end{document}
A propósito, \hyphenation{Smart Grid}
não faz absolutamente nada: as duas palavras não são hifenizadas de qualquer maneira.
Você deve considerar remover a primeira linha e incorporá-la à legenda.