Equipment Matching And Fault Simulation Analysis Of Ship Integrated Power System

With the development of shipping industry,ship power system,its complexity is higher and higher.The shipbuilding industry in various countries is competing to develop the integrated electric propulsion system for ships to improve their competitiveness in the industry.The electric power network of integrated electric propulsion ship can be regarded as a small-scale,independent,industrial compact power system,which is composed of generator set,load and distribution cable.Therefore,we can use the computer digital simulation method to study the ship integrated electric propulsion system,and match the equipment in the simulation model.Marine integrated electric propulsion system supply power for marine life electrical equipment and propulsion motor.The load fluctuation will have a great impact on the whole ship power system.With the progress of modern science and technology,the safety and stability of the ship is more and more strict.Due to the particularity of working environment and carrying load,the power system equipment failure occurs frequently.In view of the development of modern industrial production to automation,intelligence and integration,this requires the connection between the industrial production of each link is becoming more and more closely.The failure of a certain equipment on the production line may affect the safety and reliability of the ship electric propulsion system,which will endanger the personal safety of the staff.Therefore,it is of great practical value to study the typical fault types of ship power equipmentFirst of all,propeller and propulsion motor mounted on the ship to become a complex linkage mechanism,the hull-propulsion motor-the propeller can transfer energy between the three,their working state is interrelated.This paper analyzes the relationship between propulsion motor and propeller and hull in the most widely used ship integrated power system propeller.The design parameters of the design of the ship propeller parameters are designed according to the ship type parameters.The propulsion load parameter matching enables the determined power plant to accommodate changes in various operating conditions.Aiming at the propeller,the working characteristics of the propulsion motor are selected under different operating conditions of the propeller,and the function is realized on the ship integrated electric propulsion system simulation platform.Secondly,The mathematical models of transformers,rectifiers,inverters,propulsion motors and their PWM double closed-loop control,SVPWM control and direct torque control are introduced in the normal operation of ship integrated electric propulsion system.According to the electromagnetic principle of the equipment,the principle of single IGBT fault of the transformer and the fault of the single-phase circuit fault are analyzed,and the fault mechanism of the single-phase fault is deduced from the model of the normal motor and its control system.Based on the theory of coordinate transformation,the rotation coordinate model is transformed into the ?? coordinate model,the state equation model under the fault condition is obtained,and the motor fault tolerance control is proposed.Finally,this paper introduces the simulation platform of the ship comprehensive electric propulsion system.Based on the simulation platform of the ship comprehensive electric propulsion system,the typical equipment transformer and the principle of single IGBT fault of the inverter are used to advance the inter-turn short circuit and the single phase open fault model.The dynamic response characteristics of the ship's comprehensive electric propulsion system under different fault conditions and the transient characteristics of the modules in the process of dynamic change are analyzed,and the effects of different faults on the ship's fault are analyzed.The reliability of the simulation platform is verified,and the correctness of the equipment failure model is verified.The reliability and accuracy of the simulation platform are also verified.