Static Voltage Stability Limit Law of Typical Coupling Section

The distribution of wind power resources and power load in China is reverse. In large-scale wind power gathering areas, wind power generation needs to go through a multistage transmission system to boost pressure and carry out long-distance power transmission. In the process of wind power transmission, it is constrained by the static voltage stability limit of the multistage transmission section, and the power limit of each section of the multistage transmission system is coupled, so it is difficult to accurately solve the power limit of the section. In this paper, the typical coupling cross sections are summarized according to the large-scale wind power convergence network, and the multistage system can be decomposed into the nested combination of typical coupling cross sections by using the typical coupling cross sections. Based on the P-V curve method, the relationship between the active power output and the static stability limit of the series and parallel transmission system is derived, and the static voltage stability limit law of the typical coupling section is obtained. A typical coupling section sending system is built in PSASP, and the power curve is fitted according to the simulation data to verify the accuracy of the static voltage stability limit law of the typical coupling section.