Normally this happens when you have multiple datasets refreshing around the same time. I recommend looking at schedules to see if you can stager them based on how long it takes if you have a lot. You could also build a flow to autom refresh which gives you a little more flexability then the built in refresh in settings for your dataset.
Refresh operation throttled by Power BI Premium
A Premium capacity may throttle data refresh operations when too many datasets are being processed concurrently. Throttling can occur in Power BI Premium capacities, or more rarely, in Premium Gen2 capacities. When a refresh operation is canceled the follow error message is logged into the refresh history:
The operation was throttled by Power BI Premium because there were too many datasets being processed concurrently.
If the error occurs frequently, use the schedule view to determine whether the scheduled refresh events are properly spaced. To understand the maximum number of concurrent refreshes allowed per SKU, review the table at the bottom of the Premium limitations section.
To resolve this error, you can modify your refresh schedule to perform the refresh operation when fewer datasets are being processed, increase the time between refresh operations for all datasets in your refresh schedule on the affected Premium capacity, or do both. You can retry the operation if you're using custom XMLA operations.
Here is link to those errors Troubleshooting refresh scenarios - Power BI | Microsoft Docs
Hope that helps
