An adaptive scheme for distributed dynamic security assessment of large scale power systems              ! "#$%  &’’&(’ ) *+,&’’&-%. +,*$/0-..   1234’55-%.   ! 60.$  $ .0 $0$ .$ 7% %. $0% $$$$. $ #    $ $   0$    $70 .0 $ !$  $$  # $.  ##$ 0$%   . $  $   7/ .. #.  $70 %. $0% $$$$. .. 80 $.   $.  $0 7%    .$$ $$  .  !)9:9 . # $$7$ 7/#$  $## .  60$  0$  0 .   $. !$$   2370$ *;   25<&70$ *;     $0$  $ +.$ .$   $ $. $ 7  +0  $70 $.0$   $ $ .0$ 0$ $%$.$  .0  $00  #  $.   # #.   # $%$.$    $$ . $. * $%$. $0% 1 Introduction   %$ 0.    .0 7% %  0%   # 7. *  .0  7 . 7%         $07$ $   .$    : $;$ $$ * .0 7.   $07$   7 .   $$$   .0$$   $ $  .   %   $  .% $ .$ 7% .$   #  60 . !* . +.$  $ . .    $0    60$ 7% . .$    .0  $ $$ $  $# $$  $%$.$  60$ = $ 0 0   %0 > $  ).0$ ?@(A !* 7/#$  0$0% $    7.B   #    $ 0.7  $07$ $0   $07 $ # 0% 60 0.7$  #$  * $ /  $07$    C  7/# 0$ .%   7 $  .% 7.$ ?1<A ! *; $$ *  $07 .% 7 . . 0% 7%   *   #+   60  *$ ! ..0 $$   . . 7 . . 0% 7%  0.7  $07 $  # $07 $     0.7  70% #$  $. #$ ! $.0   .+ * $%$.  $7% %$$ $ 0 0    0.7  .$    7 $ $0 $ #$ +$ $  #$  0$ $  0.7   $ #7$  $60%  .+%   %. . ?5@’A    # 7  0, . .0   $0$  $  $$%  0$    $70 .0 $ ?@@@<A 0  $ $ 0.7  * $%$. $.0$ .. %. $0% $$$$. *  .0 # 7 # =   .$ .. $.$ $   $. ?@5&’A  $ *# $00$  +.% *0 %   .7 *     % % $$7   # .0   =    # , $%$.$ * 77$ 0$ WSEAS TRANSACTIONS on CIRCUITS and SYSTEMS Xing-Zhi Wang, Zheng Yan, Li Li ISSN: 1109-2734 247 Issue 2, Volume 8, February 2009