Research On Microprocessor-Based Protection And Monitor Applied To Ship Power System

With the increasing of ship power system capacity, the network structure.is becoming more and more complexity. A new higher level is required for safe operation and automation of the ship power system particularly because of the new development of all power-driven vessels.Currently, the ship power system protection are still mainly realized by the electromechanical protection devices with simple functions,and the on-line monitoring of the network operation is mostly achieved by instruments of analogue mode.It is hard to meet the needs of the development of ship power system automation.Therefore, studying the experience of research and applications about large power system integrated automation systems on land and developing a new integrated automation system with the function of microprocessor-based protection and on-line monitoring is of great realistic significance to improve the safety and vitality of the ship power system,and it has broad application prospects too.Firstly,the paper analyses and summarizes the actuality and main problems of the researches and applications on ship power system protection and on-line monitoring. Basing on that, the paper gives an ensemble design of an integrated automation system with the functions of protection and monitoring.The paper describes the project's principles and its functional configuration features in detail.The design of hardware platform is an important part when developing the system.The paper gives the system's hardware project which is applicable to ship network automation requirements refers to the experience of developing a microprocessor-based protection and on-line monitoring system used in traditional power system,and gives the main templates'design and selection.The paper systematically expounds the hardware platform's basic structure,configuration of the CPU template and the circuit of main boards at periphery.Protection capability is very impotant to the safe operation of ship power system.The paper gives an in-depth analysis to the actuality of functional configurations and principles of ship power system protection.Basing on that,gives new principles and projects fit to microprocessor-based sets with the help of microprocessor's advantages.Thus further improves the protection capability.The paper expounds the main principles and basic arithmetics in detail.Software design is one of the main tasks in the process of developing the device.In order to facilitate software development,maintenance and function expansion,the paper uses a modular method in process of soft design.The paper introduces the basic structure of the software and the methods that how main function modules are realized.As the ship electric equipments work in a bad environment,how to improve anti-jamming capacity of the device is very important when designing it.The paper focus on the analysis and discussion of EMI characteristics and influence, gives the anti-jamming measures including hardware ones and software ones when designing the device.Finally, the paper summarizes the research work refers to it,and expounds the emphases of the research work to be done.