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A chiller can be placed on the demand side of an Plant Loop without any problems, and you're free to put whatever you want on the supply side on that plant loop, including a chiller, so there's no issue modeling your setup.

I've just setup a dummy test case in openstudio where I modeled 3 PlantLoops:

• Condenser Loop with CT on supply, Primary Chiller on demand. SPM = FollowOutdoorAirTemperature with a 7°F offset on Wetbuld
• Primary Chw Loop with Primary Chiller on Supply, Secondary Chiller on demand. SPM = Scheduled, 55°F
• Building ChW Loop with Secondary Chiller on supply, and a coil (on a AirLoopHVAC too) on the demand side. SPM = Scheduled, 44°F

It simulated without any problems as I expected.

Here's a Gist with my model, built with OpenStudio 2.7.1 (was the version I had installed on the machine I used, don't read too much into it).

A chiller can be placed on the demand side of an Plant Loop without any problems, and you're free to put whatever you want on the supply side on that plant loop, including a chiller, so there's no issue modeling your setup.

I've just setup a dummy test case in openstudio where I modeled 3 PlantLoops:

• Condenser Loop with CT on supply, Primary Chiller on demand. SPM = FollowOutdoorAirTemperature with a 7°F offset on WetbuldWetbulb
• Primary Chw Loop with Primary Chiller on Supply, Secondary Chiller on demand. SPM = Scheduled, 55°F
• Building ChW Loop with Secondary Chiller on supply, and a coil (on a AirLoopHVAC too) on the demand side. SPM = Scheduled, 44°F

It simulated without any problems as I expected.

Here's a Gist with my model, built with OpenStudio 2.7.1 (was the version I had installed on the machine I used, don't read too much into it).