Abstract: Arge-scale integration of distributed photovoltaic power into distribution networks brings dual effects. Local consumption reduces line losses, eases power transmission pressure, improves voltage quality and delays power grid expansion. However, high penetration may cause voltage violation and reverse power flow, and alter protection logic due to intermittent output and peak-shaving reversal characteristics. Meanwhile, power electronic interfaces lack rotational inertia, weakening the system frequency regulation capacity and frequency stability. Therefore, measures including inverter control optimization, energy storage deployment, active distribution network construction and demand response shall be adopted to realize coordinated management of generation, grid, load and storage, ensuring the safe and efficient absorption of high-proportion distributed photovoltaic