Analysis on voltage fluctuation of active distribution network containing wind-solar hybrid distributed generation

This paper mainly analyzes the alleviation effect of distributed generation on voltage fluctuation in the active distribution network. Firstly, the triangular load model is used to device the influence of the capacity of distributed generation on the voltage of active distribution network theoretically. Then, the access location of distributed generation impact on the voltage change is discussed. Two conclusions are drawn: the maximal voltage drop location before the distributed generation access point is only related to the distributed generation capacity in active distribution network; and the closer the distributed generation access point is to the distribution network terminals and the better the effect of alleviation the voltage fluctuation in the whole distribution network. The models of distributed wind power and distributed photovoltaic generation are also established, separately. Finally, considering the influence of weather factors on distributed generation, weather characteristics of different seasons scenarios are included in the model. The case study is carried out on IEEE 33-bus with wind-solar hybrid distributed generation. The results show that due to the chronological and spatial complementation between wind power output and photovoltaic generation, voltage fluctuation of the active distribution network can be effectively alleviated by wind-solar hybrid distributed generation in different season scenarios.