Fault Analysis And Research On Gansu Baiyin State Grid Based On State Grid Comprehensive Simulation System

With the rapid development of national economy,the construction of State Grid has made great progress.In recent years,the scale of the Baiyin State Grid keeps expanding and the structure and operation mode of the grid becomes more and more complex.Therefore,it is imperative to study and analyze the operation status of the State Grid under various disturbances and to solve various problems caused by new technologies and equipment.With the large-scale expansion of the State Grid,the introduction of new equipment and new technologies,there are more and more "difficult diseases" affecting the safe operation of the State Grid.For example,transmission lines are located in harsh natural environments such as mountains,or need to cross roads,railways,and rivers,etc.Many problems in the State Grid are difficult to resolve.Testing and theory cannot be verified,so this brings huge hidden dangers to the safe and stable operation of the State Grid.At the same time,in order to improve the security of State Grid.Operation,power companies should promptly resolve various problems that may occur during operation,intervene in advance to avoid risks,and propose practical solutions,while the problem will not be solved overnight and will need to be repeated many times by comparing and verifying multiple schemes,it is impossible for power equipment in actual operation to allow multiple live tests.However,if the power outage is to be verified,the first is that the conclusions obtained are not convincing,and the second is that frequent power outages are not feasible.Therefore,fault simulation and scheme verification on the grid simulation system are the only choices to solve practical problems.In this paper,we use the multi-dimensional comprehensive simulation system of power grid,make a study on the unreasonable action of main transformer gap protection in Baiyin power grid.In this paper,first of all,through the powerful accident inversion function of the simulation system,,fault simulation is carried out for several faults of the same type occurred in the network in 2018,after the results are compared repeatedly,the preliminary reasons obtained by theoretical analysis are put forward.According to the principle of single variable,the scheme is designed for different accident causes,each scheme only changes one of the variables to ensure the feasibility of the conclusion.Then,the conclusion of the scheme is compared horizontally and vertically,and eight solutions are put forward in total.Through rationality demonstration and current feasibility.Finally,three practical solutions are determined,for these three solutions,in order to ensure their reliability,they are used in the simulation system for many times.After the correctness is verified,they are applied to the actual power grid.This paper first introduces the functional modules that constitute the State Grid simulation system,and then presents the key technologies to develop the system and thesupporting platform needed to realize the system.Then a class of typical faults occurred repeatedly in the Baiyin State Grid are introduced.And the system is used to carry out accident inversion,taking the study of this fault as the starting point.Using simulation system to complete theoretical analysis,propose solutions and verify the correctness of the solutions.Finally,the effect of the final scheme applied to the actual power grid is introduced.Finally,it analyzes the security effect and economic benefit of the system after it is put into use.