Conventional power plants based on synchronous generators are being replaced with renewable energy sources, consequently increasing the proportion of inverter-based resources in the system. In this context, the total grid inertia is decreasing and system services that were traditionally delivered by synchronous generator need to be provided by inverter-based resources. To this end, it is necessary to develop and implement advanced inverter controls, such as grid-forming capability, that allow the provision of newly defined services. In this paper, dynamic analyses are performed, using DigSilent PowerFactory, on a power system with a significant presence of inverter-based resources. The study is based on the Swiss future scenarios. The effectiveness of grid forming inverters, based on droop control as well as virtual synchronous machine algorithms, on frequency support is studied. The results show that grid forming inverters have the potential to counteract the negative effects of traditional grid following inverter-based resources, as currently used by renewable power plants.