Technical knowledge evolution analysis and statistics based on patent complex network

From the perspective of knowledge network, the research on the evolution law of technology network can understand the technology evolution mechanism and grasp the trend of technology development, which has certain guiding significance for formulating reasonable and effective technological innovation planning. Based on the PatSnap database, the patent data of the wind power industry (1900-2019) was obtained, the technical knowledge life cycle was divided according to the change of patent number and logistic s curve, and the knowledge graph of the patent network was constructed according to the citation relationship for analysis. The results show that the knowledge network evolves from the embryonic scalefree network to the small-world network, the connection between core patents weakens, overall patent node cohesion enhanced and the proportion of H02J3 classification technology expands.