Study on causes of limited transmission capacity of Sichuan-Chongqing power grid based on DC-sensitivity

With the rapid growth of the load in Chongqing, it is necessary to improve the transmission access's capacity of the grids in Sichuan and Chongqing, and is urgent to address the problem of extremely imbalanced distribution for Sichuan-Chongqing connection. This paper is based on distribution characteristics analysis of Sichuan Chongqing and Hubei grids' power flow, adopts DC-sensitivity analysis and achieves Sichuan-Chongqing power grid system on Sichuan-Chongqing line of contact sensitivity, and analyzes the imbalance issues. It handles the Hubei's grids jointed with the grids in Chongqing, as the external nodes by the simplified and equivalent network. According to the actual situation of Sichuan-Chongqing grids, the sensitivity of Chongqing-Sichuan connections is comparatively analyzed, including power and load of Chongqing and Sichuan as well as Chongqing-Hubei connections. Lastly, the causes for limitations are got and some improvements are put forward.