| As a result of the power grid collapse accident often happened that caught theattention of the electricity workers.when the power grid collapsed, the research of thermaloverload of transmission component caused by flow transferring got the attention of theresearchers, Now this is a hot topic of power system analysis. Therefore, the key point ishow to combine all factors to find the most weak link of the power grid and look for themethod of the grid vulnerability identification.This topic aim at after a fault happens in power grid, the grid tide redistribution,according to the power grid branch temperature changes in the situation analysis of thevarious factors influencing the power grid failure. Again, from the perspective of theoperation mode,integrated all factors to find out the most weak link and fragileregion,given the analysis of the power grid and prevention, in order to reduce theeconomic consequences of the failure of the grid. Firstly, on the condition of Currenttransfer,given the relationship between power and power grid node injection by using themethod of dc current trends, then according to the branch transmission power and therelationship between node power injection, analyzed the sensitivity of the branchtransmission power to the node power injection, divided the grid vulnerability areas, andto the division of the fragile branch use electrothermal coordination analysis method tojudge the temperature of eachbranch.Compared the carrying capacity of electric currentwhich resulted from the temperature and flow meter model to the branch current, takeeffective measures to the branch which beyond the limit temperature,in order to ensure thesafety of power grid.Used the temperature indicators instead of carrying capacity or other factors, moreintuitive to link to the actual, monitoring of the grid, in case of continuous thermaloverload prevention phenomenon. Due to the transmission power of the branch mainlydepends on the node power injection, therefore, research branch of the transmission powerof node power injection to judge the operation mode is reasonable, and to prevent causedby tidal current transfer chain fault has a certain reference value. Using electrothermalcoordination, dig the current-carrying capacity of the transmission line, the research ofgrid also has a certain reference value. |
