function deltH=func_deltH(busNum,fsY11,Loadi,Balance)
H=[
    real(fsY11),-imag(fsY11);
    imag(fsY11),real(fsY11);
    
];
deltH=[
    H';
    sparse(1:length(Loadi),Loadi,-1,length(Loadi),busNum*2);
    sparse(1:length(Loadi),Loadi+busNum,-1,length(Loadi),busNum*2);
    %sparse(1:length(Balance),Balance,-1,1,busNum*2);
    %sparse(1:length(Balance),Balance+busNum,-1,1,busNum*2);
];
end