Can this storm door be repaired
I have a similar setup, but in my case, it's screen doors, so very lightweight in comparison to yours.  I may be wrong, but I don't think you can repair individual hinges on that type of door. I think you're going to be needing to replace the entire hinge rail on that side.  This component is also known as a Z-bar.  You should try to determine the manufacturer of your door, and then you can check with them to see if they sell replacement Z-bars for your door - they run anywhere from $30-$60, depending on size.  Here's a URL to an example replacement part for a brand that appears to be similar to your design: https://www.menards.com/main/doors-windows-millwork/door-window-hardware/storm-door-replacement-parts/survivor-80-aluminum-storm-door-hinge-side-z-bar/71922/p-1444423382755.htm  Good luck!