请帮我解决一下这个附录问题。代码如下：
\documentclass{article}
% for 2-column layout use \documentclass[USenglish,twocolumn]{article}
\usepackage[utf8]{inputenc} %(only for the pdftex engine)
%\RequirePackage[no-math]{fontspec}[2017/03/31]%(only for the luatex or the xetex engine)
\usepackage[big,online]{dgruyter} %values: small,big | online,print,work
\usepackage{lmodern}
\usepackage{microtype}
\usepackage{amssymb,amsmath,amsgen,theorem,graphicx,epsfig}
\usepackage[numbers,square,sort&compress]{natbib}
\usepackage{booktabs, multirow}
\usepackage{cleveref}
\usepackage{subcaption}
\usepackage{caption}
\begin{document}
Power system oscillations’ behavior is a dominant thought in the power system stability discipline\cite{Perez-Londono:2012,Munoz:2011}.
all data are well mentioned in \ref{secA1}
\begin{Appendices}
\section{}\label{secA1}
\noindent \textbf{\underbar{A.1. Multimachine power system parameters}}\underbar{:}
\noindent \textbf{\underbar{}}
\noindent \textbf{Generator1: }Power, voltage and frequency ratings [100MVA, 16.5kV, 60Hz]. ra=0 p.u, xl=0 p.u, Xd, X'd, X"d [0.1460p.u, 0.0608p.u, 0 p.u], T'd0 and T"d0 [8.98s, 0.0s], Xq, X'q, X"q [0.0969 p.u, 0.0969 p.u, 0.00p.u.], T'q0 and T"q0 [0.31s, 0.00s] Inertia (M = 2H) and Damping [2*23.64s, 0.00p.u.], Kw and Kp [0.0p.u., 0.0p.u.].
\noindent \textbf{} \newline
\end{Appendices}
\begin{thebibliography}{99}
\bibitem{Perez-Londono:2012}
\href{https://ieeexplore.ieee.org/document/6319119}{S. Pérez-Londoño, L. Rodríguez-García, Y. U. López. Effects of doubly fed wind generators on voltage stability of power systems. In \emph{2012 Sixth IEEE/PES Transmission and Distribution: Latin America Conference and Exposition (T{\&}D-LA)}; 2012; Montevideo, Uruguay: pp. 1-6. doi: 10.1109/TDC-LA.2012.6319119}
\bibitem{Munoz:2011}
\href{https://ieeexplore.ieee.org/document/5772545}{J. C. Muñoz, C. A. Cañizares. Comparative stability analysis of DFIG-based wind farms and conventional synchronous generators. In \emph{2011 IEEE/PES Power Systems Conference and Exposition, PSCE} 2011; Phoenix, AZ, USA: pp. 1-7. doi: 10.1109/PSCE.2011.5772545}
\end{thebibliography}
%\end{Appendices}
\end{document}
如果需要的话这里还有 sytle 文件https://file.fm/u/gd4cvpeez。提前致谢。