Why get queryplans recompiled every minute
After some extended research I found the cause of my problem.
So to calculate the cache pressure limit SQL Server uses following formula:


  75% of visible target memory from 0-4GB + 10% of visible target memory from 4GB-64GB + 5% of visible target memory >64GB


Since SQL Server 2012 and above, memory pressure is triggered when a cache store grows to 62.5% of the plan cache pressure limit.
When this happens, plans are removed from the cache using an algoritm called eviction policy, which is based on plan cost.
So at certain moments I see a drop in the size of my plan cache and this scenario happens several times in a day, causing every time the compilation of new plans.