Abstract: We propose a distributed voltage regulation algorithm for radial distribution networks using the fast voltage support provided by distributed generation to mitigate voltage fluctuations and voltage limit violation in distribution networks due to high-penetration renewable energy. Contrary to the currently used distributed voltage regulation approaches, which control distributed generations directly, we achieve distributed voltage regulation in distribution networks by controlling distributed generations indirectly using incentives. Moreover, we also consider the costs of active power purchased from the main grid and the balance of additional reactive power due to voltage regulation in distribution networks in the proposed voltage regulation problem. Based on the barrier function method and dual-ascent algorithm, we transform the proposed voltage regulation problem into a distributed optimization problem that can be resolved cooperatively by buses of the distribution network. Furthermore, we propose a corresponding incentive-oriented distributed voltage regulation framework. Under this framework, considering the output decision feedback from buses, the distribution system operator continuously updates and broadcasts incentives for active and reactive power outputs to coordinate the outputs of buses, thereby indirectly achieving voltage regulation. The effectiveness of the proposed algorithm for voltage drop and rise in distribution networks is validated by the case studies.