Transient voltage problem analysis of multi-level transmission cross section limit coupling characteristics based on cluster analysis

The complex and variable operation mode of the new power system with renewable energy sources as the main power resources and the multi-sectional coupling characteristics of the AC-DC large power grid led to the difficulty of maintaining the conventional grid pre-control limit method that relies on the typical mode. In this paper, by constructing a coupled model of transmission section limits, the transmission section limits under multi-level coupling are quantified and analyzed. Based on the section limit data, an adaptive K-means clustering extraction method is proposed to calculate the associated section limits and the dominant fault stability margin influence factor matrix by combining the parameter ingestion method. The adjustment scheme of the critical section limit can be obtained efficiently by the proposed method. At the same time, considering the adaptive K-means clustering extraction method, the error caused by numerical incompatibility is reduced. The effectiveness of the proposed method is verified by using the northwest network channel as a numerical example.