function deltdeltF=func_deltdeltF(busNum,fsY11,Loadi)
% H=[
%     real(fsY11),-imag(fsY11),zeros(busNum,length(Loadi)*2);
%     imag(fsY11),real(fsY11),zeros(busNum,length(Loadi)*2);
%     zeros(length(Loadi),busNum*2), eye(length(Loadi)),zeros(length(Loadi));
%     zeros(length(Loadi),busNum*2), zeros(length(Loadi)),eye(length(Loadi));
% ];

% H=[
%     real(fsY11),-imag(fsY11),zeros(busNum,length(Loadi)*2);
%     imag(fsY11),real(fsY11),zeros(busNum,length(Loadi)*2);
%     zeros(length(Loadi),busNum*2), eye(length(Loadi)),zeros(length(Loadi));
%     zeros(length(Loadi),busNum*2), zeros(length(Loadi)),eye(length(Loadi));
% ];

% deltdeltF=H'*H;
deltdeltF=[
  zeros(busNum*2,busNum*2+length(Loadi)*2);
  zeros(length(Loadi)*2,busNum*2),2*eye(length(Loadi)*2);
];
% deltdeltF=0;
end