Respected Ray I performed simple runopf function to check the cost minimization of case 30 by observing objective function in dollar per hour. Similarly, when i increased the load in Pd column it gives error of "too many refrence buses making a connected system..." But when i run case 30 with dispatchable loads the opf results in negative objective function. What does the negative objective function means. How can it made positive? The objective function is not only negative but is very different from base case. Base case had 576 $/hr and dispatchable loads case has 21940$/hr (the loads are 20% more then base case but let me know if this answer of obj fcn is feasible under this situation,it can be around tgis figure or its impossible and I am msking other mistakes ).
Thanking you in advance. Maliha
