Renewable energy resources present substantial techno-economic potential; however, increasing penetration levels pose major challenges to power system operation, stability, and security. High integration significantly impacts not only distribution networks—where most renewable generators are connected—but also the overall grid dynamics. Therefore, it is essential to redefine defense and system restoration strategies while exploiting advanced control methods to maximize the support capabilities of renewable resources under critical conditions. The objective is to establish rigorous integration criteria for renewable energy systems within conventional power grids and to highlight the crucial role of power-electronic interfacing devices in ensuring reliability, flexibility, and grid resilience.