Hi Guys, I got a problem, I follow the instruction of Dr. Graham Dudgeon to do the large scale modelling, I am trying to do it in Matlab 2020a, it includes Model reference by using Simscape Power System (ST). When I run the model, it shows error 'The model has changed between the time when two instances of this model were compiled. This is not allowed for models referenced in Normal Mode.' It was strange because I did not use any random parameters int the reference model. Then I gradually delate element for testing in the reference model, and I found the issue was from the signal conversion block (because the model reference cannot take the physical signal as an input, so I have to convert the signal type). By delating the conversion block, the error disappear (the signal conversion block was copied from the Sample model made by Dr Graham). There is no random elements in the signal conversion block as well, why this error reports to that one?
The following picture is the diagram of conversion block.