The integration of renewables is reshaping both the device-level control and system-level operation of modern power systems, resulting in a heterogeneous grid with diverse generation assets. However, the inherent variability and intermittency of inverter-based resources (IBRs) introduce increasingly complex and volatile operating conditions, posing significant challenges to their strength, stability, and operation. Traditional synchronous machines are struggling to sustain reliable performance and dynamic capability when interacting with IBRs under fluctuating grid conditions. At the same time, the voltage, frequency, rotor-angle stability, as well as the overall efficiency of modern power systems, are becoming increasingly vulnerable. Addressing those challenges requires the development of new paradigms for the operation and control of Electric Machines and New-Energy Power Systems, ensuring a modernized grid that delivers reliable, affordable, secure, and resilient electricity.

The modernization of the power system requires the integration of various energy resources to achieve strength, stability, and operational efficiency. However, existing technologies remain limited, as they do not fully leverage the capabilities of synchronous machines and IBRs, nor do they achieve effective coordination with advanced enabling equipment. To address these challenges, new theories and technologies are urgently needed to enhance system strength, improve stability, and refine operation, thereby supporting the secure and efficient operation of modern power systems with mixed generation assets. This Research Topic emphasizes three key directions: 1. Strength quantification, stability analysis, and operational principles for grids with mixed generation assets. 2. Cutting-edge control theories and methods to enhance grid strength and stability in modern power systems. 3. Proactive allocation and regulation of active- and reactive-power resources to reinforce the grid-connection strength and stability of electric machines and renewable-energy systems.

This Research Topic focuses on enhancing grid strength, stability, and efficiency of modern power systems with mixed generation assets through an innovative analytical framework, advanced control approaches, and novel operational strategies. Topics of interest include, but are not limited to
1. Operational characteristics of synchronous machines interacting with IBRs;
2. Fault monitoring and diagnosis of generators under wide-frequency oscillations;
3. Advanced control theories for stable and reliable generator operation;
4. Strength quantification, calculation, and optimization of IBR-penetrated power systems;
5. Stability analysis and mechanism investigation of IBR- penetrated power systems;
6. Wide-frequency oscillation analysis and mitigation strategies;
7. AI-empowered technologies for enhancing grid strength and stability;
8. Grid-forming technologies and device innovation;
9. Operational technologies for synchronous machines and IBRs;
10. Allocation and regulation of reactive-power compensation devices and multi-type energy storage systems;
11. Risk assessment and secure operation of IBR-penetrated power systems;
12. Monitoring and assessment of grid strength and stability margins in IBR-penetrated power systems.

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Strength, Stability, and Operation of Electric Machines and New-Energy Power Systems