Abstract: Abstract: This paper mainly analyzes the voltage fluctuation of caused by the increasing penetration of distributed generation (DG) in the active distribution network. Firstly, the triangular load model is used to deduce the influence of DG on the voltage of active distribution network in the mechanism. And then, the sensitivity coefficient is discussed, which the capacity and access point location of DG impact on the voltage change. Through the sensitivity analysis two conclusions are pointed out: The maximal voltage drop location before the DG access point is only related to the DG capacity in active distribution network; the closer the DG access point is to the distribution network terminals and the better the effect of suppressing the voltage drop in the whole distribution network. On this basis, the models of distributed wind power generation (DWPG) and distributed photovoltaic generation (DPVG) are established, separately. Finally, considering the influence of weather factors on DG, weather characteristics of different seasons scenarios are used in the model. As a validation example, IEEE 33-bus active distribution network with wind-solar hybrid DG is used to analyze. The results show that: through the control center's regulation of wind-solar hybrid DG, the voltage fluctuation of the active distribution network can be effectively suppressed in different seasons scenarios. Keywords: Active distribution network; Distributed generation; Voltage fluctuation; Weather factors 1. Analysis on Influence of DG on the Voltage of Active Distribution Network In this section, based on the triangular load model of the distribution network, the DG capacity and access point sensitivity are deduced in the mechanism, and the sensitivity of the DG to the distribution network voltage can be analyzed. 1.1 The Sensitivity of DG Capacity The subsection deduces the sensitivity relationship between the DG capacity and the voltage drop in distribution network. It is concluded that the maximal voltage drop location before the DG access point is only related to the DG capacity in active distribution network. 1.2 The Sensitivity of DG Access Point The subsection deduces the sensitivity relationship between the DG access point and the voltage drop in distribution network. It is concluded that the closer the DG access point is to the distribution network terminals and the better the effect of suppressing the voltage drop in the whole distribution network. 2. Distributed Wind Power Generation In this section, the wind speed is described by the Weibull distribution. On this basis, the model of distributed wind power generation (DWPG) is established. 3. Distributed Photovoltaic Generation In this section, the solar light intensity is described by the Beta distribution. On this basis, the model of distributed photovoltaic generation (DPVG) is established. 4. Influence of Weather Factors on DG In this section, considering the effectiveness of weather factors on DG, IEEE 30-bus with wind-solar hybrid DG is used to analyze. 4.1 The Weather Characteristics of Seasonal Scenes This subsection gives the weather characteristics of the four seasons. 4.2 Analysis of Voltage Fluctuations Affected by Weather Factors This subsection analyzes the influence of weather factors on the voltage of active distribution network. 5. Conclusion Through the control center's regulation of wind-solar hybrid DG, the voltage fluctuation of the active distribution network can be effectively suppressed in different seasons scenarios. Author’s brief introduction and contact information: Shixiong Qi (Student Member, IEEE) received the B.S. degree in electrical engineering from Dalian University of Technology, China, in 2017. He is now pursuing the M.S. degree in the electrical engineering in Xi’an Jiaotong University. E-mail: qishixiong@stu.xjtu.edu.cn Tel: 15829531535