Abstract: With the advancement of the “dual-carbon” goals and the current high penetration of renewable energy and power-electronic devices, hybrid AC/DC distribution networks face systemic challenges—diminished grid stability, degraded power quality, and dynamic mismatches between generation and load. This review examines five key topics: the evolution of the Energy Internet; how renewable connections alter voltage, frequency and harmonics in AC/DC systems and the algorithms developed to detect and correct those issues; the ways in which demand-side uncertainties upset supply–demand balance; emerging demand-side management techniques that restore equilibrium; and the latest integrated energy-planning methods that optimize network operation. In conclusion, review outlines future research directions for integrated energy planning in AC/DC distribution networks, offering theoretical guidance and practical insights for subsequent studies.