Development Of A Monitoring And Security Unit For Ship Hybrid Systems Based On CRIO

The energy saving and emission reduction of engines has long been the focus of people’s attention.In recent years,with more and more regulations issued in the shipping industry,the research of new environmentally friendly ships has become a hot topic.Marine gas-electric hybrid power system not only fully absorbs the advantages of natural gas engine with abundant fuel reserves,clean and environmental protection,but also the addition of reversible motor can make up for the disadvantage of poor dynamic response of natural gas engine.In addition,the right energy management strategy can make the powertrain more energy efficient.Therefore,the ship gas-electric hybrid power system is getting more and more attention.However,the complexity of the hybrid system structure also brings higher challenges to its safety.In this paper,the parallel Marine gas-electric hybrid power system as the research objective,combined with industry norms and characteristics of the gas-electric hybrid power system,designed a set of safety and power supply stability of the monitoring and security unit.The main contents of this paper are as follows:(1)Overall design of monitoring and security system.Analyze the working scenarios of Marine gas-electric hybrid power system according to the requirements of industry regulations,and determine the functions of monitoring and security system;According to the controller performance of hybrid power system and the interface of each device controller of hybrid power system,the overall architecture of monitoring and security system is developed.(2)Monitoring and security system design.By analyzing the operating characteristics of each equipment in the gas-electric hybrid power system and consulting the literature,the parameters which can reflect the operating state of the equipment are determined,and the threshold of normal operation of each parameter is established.Through fault classification and according to the different situation of the fault,a series of security measures are formulated.Based on the idea of modularization,the security strategy is decomposed into different functional modules,and simulation platform is used to establish the control model.(3)Software and hardware design of monitoring and security system.In this paper,NI CompactRIO is used as the controller,and the hardware platform of monitoring and security unit is built based on it.The communication between CompactRIO and each device controller and monitoring interface of hybrid power system is completed based on CAN bus protocol.(4)Hardware-in-the-loop simulation test.Based on the Marine power simulation experiment platform,the hardware-in-the-loop test of the monitoring and security unit is completed.The test takes the speed and torque of the engine and motor as indicators,which proves the effectiveness and timeliness of the monitoring and security unit in handling faults under different working modes.