Abstract: In recent years, the meaning and phenomena of modal resonances have expanded from the low-frequency modal resonance of synchronous generators to the wide-frequency modal resonance of renewable energy, which cannot be classified into the traditional modal resonance. To deeply investigate and solve the modal resonance issues under the background of new-type power systems, the paper first elucidates the meaning of traditional modal resonance and introduces a classification framework for generalized modal resonance. Then, the paper concludes power systems generalized modal resonance events and theoretical analysis at home and abroad. On this basis, the research status of power systems generalized modal resonance hazards and mitigation methods are summarized. Finally, research difficulties and future research directions on the generalized modal resonance are discussed.