How to solve my Error "Conversion to logical from sym is not possible" in my program" for Differential Relay equation

1 次查看（过去 30 天）

m gh 2018-8-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/416027-how-to-solve-my-error-conversion-to-logical-from-sym-is-not-possible-in-my-program-for-differenti

评论： m gh 2018-8-24

Hi Guys, I have a problem with this Error "Conversion to logical from sym is not possible" in my program" for Differential Relay equation.I want to find out about these coefficients "IS1 K1 IS2 K2" Thanks

   syms IS1 K1 IS2 K2 Idiff Ibias  ;
     Idiff=3    ;
   Ibias=1.5   ;
 if Ibias < IS2
    Idiff > (K1*Ibias+IS1)   %then trip
 elseif Ibias >= IS2 
   Idiff >= (K2*Ibias)-(K2-K1)*IS2 +IS1       %then trip
    end            
 %IS1:  The basic differential current setting
%K1:  The lower percentage bias setting
%IS2:  The bias current threshold setting
%K2:  The higher percentage bias setting