Research On Fault Diagnosis Method Of Ship Shore Power

Aiming at the problems of overcurrent and malfunction of relay protection in the process of ship shore power connection,a new method of ship shore power fault diagnosis is proposed.This paper combines the fault diagnosis technology of the land power grid and the ship power grid,the relay protection scheme of ship shore power system is analyzed,and studies the state relationship between the multiple relay protection and the comprehensive influence of the power system on the shore ship under the condition of relay and circuit breaker's rejection / misoperation.First,the paper introduced the development history of ship shore power technology and the research status of fault diagnosis technology.It is determined that the fault diagnosis of the ship shore power system is carried out by combining the analytical model and the wind driven optimization algorithm,and designs the digital coding of the object model of the ship's shore power system.Secondly,the principle,advantages and disadvantages of the wind-driven algorithm are studied.For the traditional wind driven optimization algorithm,it is easy to fall into the problem of local optimum and premature convergence.In the optimization process,the Levy flight mechanism is introduced to update the position of particles and improve air quality.The search scope and population diversity of the particle point enhances its ability to jump out of the local optimum and does the corresponding simulation experiment.Based on this,a binary Levy flight-wind-driven optimization algorithm is obtained by integrating the existing mapping methods,and the detailed flow is given.Then,the construction ideas and methods of the current mathematical analytic model are studied,a mathematical analytical model which based on the ship shore power target is built.A binary Levy flight wind driven algorithm is used to solve the fault calculation example of ship shore power system,and detailed simulation analysis is carried out.Finally,a visual diagnostic tool is written by C# advanced programming language on the Windows platform.Diagnostic methods and algorithm functions in MATLAB were packaged and imported into engineering project.Combined with Matlab Compile Runtime components,a visual instrument for ship shore power fault diagnosis is constructed.In this paper,the component state,analysis rules of relay protection device and analysis rules of breaker action are combined to build a mathematical expression that can reflect the logical relationship between them as a mathematical analytical model for the fault diagnosis of the ship shore electric power system.The existing wind driving algorithm is improved and the simulation analysis is done.The experiment proves that the improved strategy improves the convergence precision and optimization efficiency of the test function.The existing mapping method is modified to get the binary Levy flight wind driving algorithm.Using this algorithm to solve the fault model iteratively,the fault hypothesis which is most consistent with the alarm information is obtained.The fault calculation example is simulated to get a better diagnosis result and verify the rationality of the model and the reliability of the improved algorithm.