Static Safety And Stability Analysis Of Regional Power Grids

The study of power grid security and stability has always been an important concern of the power department and related staff.As the surge in power load leads to an increase in transmission pressure on the power grid,the complexity of the grid frame also increases,and if the power grid is affected by bad weather or there is human misoperation,it will lead to its operational stability being damaged.In order to effectively prevent the occurrence of large-scale power outages,the set and analysis of the expected accidents of the power grid can effectively improve the stability and economy of the power grid operation and reduce the probability of accidents.Therefore,this paper mainly analyzes the static safety and stability of power grid in northern Shaanxi,finds out the potential safety hazards and irrationalities in the power grid in the region,and puts forward corresponding solutions,which is of great significance to the security and stability of the power grid in the region.This paper lists the impact of some major power outages that have occurred around the world on society,shows the importance of safe and stable operation of power system to social development,and expounds the research status of domestic and foreign scholars on power grid stability from different perspectives.From the perspective of improving the safe and stable operation of the power grid,the relevant theories and methods used in the research process are expounded.Then,the social and economic development situation and grid structure of a certain region in northern Shaanxi were introduced,and the functions and operation steps of the PSASP Power System Analysis Software Package(PSASP)were briefly expounded.Then,based on the detailed operation data of the power grid in the region,the PSASP software was used to build a simulation model of the power grid in the study area,and the power flow calculation results under the four typical operation modes were calculated on the basis of the model.In the calculation results,it can be concluded that the transmission pressure of the grid frame in this region increases during the typical operation mode of heavy load in winter,and there are some safety risks compared with the other three operation modes.Then,based on the operation mode of Dongda,the model is analyzed with N-1 static safety,and the analysis objects include lines,nodes and transformers,and it is found that the load rate of some lines and transformers is too high and the bus voltage exceeds the limit,and then the load margin of each region is calculated based on the theory of load margin index.After static safety,in order to ensure the accuracy of the analysis results,the relevant theory of modal analysis method is combined with the power grid simulation model to calculate the participation factors of each node in the system,and the weak nodes and weak areas in the research area are accurately judged by the size of the participation factor values,and the weak areas are divided into first,secondary and tertiary levels,which is convenient for subsequent observation and analysis.According to the potential safety hazards found in the simulation analysis,relevant suggestions and solutions are proposed.Mainly include: taking measures such as increasing the single-loop line to a double-loop line or transferring part of the load to reduce the transmission pressure of the line to solve the problem of line load ratio exceeding the limit,changing the generator terminal voltage and adding parallel compensation devices to improve the load margin index in each region,changing the transformer transformation ratio and adding parallel compensation devices to improve the problem of low node voltage,and adopting methods such as transferring part of the load and separating the main transformer to solve the problem of large overload multiples of transformers in some nodes.In addition,in the process of analysis,it is also found that some nodes are single-wire single-change,some110 k V conductor cross-sections are small,the operating life is long,and the multi-model splicing problems are also found to be insufficient,and the problem of insufficient transfer capacity between each 330 k V power supply area is also proposed.