How to view voltage graph in simulink
There are a number of things missing in your model

1) reference. Place a GND node on the - of the main source

2) connect the voltage monitoring block. Right now the voltage monitoring block isn't connected (red traces)

3) suitable sink connected to the voltage measurement. A scope is fine (remember to turn off last 5000samples only). I prefer workspace sinks and to plot in figures.

Finally make sure you simulation runs long enough for an output to appear (no point running for 1ms if things don't start occurring for 10ms)

--edit--

Those appear to be simscape parts not simpower systems. That voltage monitor is from simpowersystems.