Intuitively, the higher the symmetry in the dynamic response of a dynamical system, the higher the predictability of the system behavior and controllability. Thus, a precise evaluation of the asymmetries present in a system contributes toward increased power system stability and resilience. The devices and controllers that form a power system are for the most part symmetrical. However, it has been recently observed by some TSOs that power systems are becoming increasingly asymmetrical. The aim of this chapter is to study the causes of frequency probability distribution asymmetry in power systems, provide a qualitative theoretical appraisal of this asymmetry; and, finally, show how asymmetry can be compensated through modified control.