Distributed battery management system network architecture.
Thesis DisciplineElectrical Engineering
Degree GrantorUniversity of Canterbury
Degree NameDoctor of Philosophy
The design of a modular, flexible and extensible distributed CAN-based battery management system is examined in this thesis. The advent of next generation networks has placed an increasing demand for greater reliability from telecommunication power systems. A crucial component of the power system is the standby battery network. Battery networks are typically monitored by battery management systems. Existing management systems are more concerned with process level control methodology rather than system level organisation of the network architecture. Moreover, most existing systems are based on proprietary communication protocols. The proposed management solution addresses these local area network limitations, as well as the distribution of intelligence at the process level, integration between the local and wide area networks and transparency between the process and user levels. The local network organisation is based on generic network nodes which perform management, monitoring and control activities through specialised hardware interfaces. Remote connectivity to the local network is facilitated through applet-servlet communication over the Internet. A modular design has been applied to the implementation of the node software to allow easy expandability of node functionality. The local battery network has been naturally and logically partitioned and a distributed data organisation has been adopted to facilitate transparency of data transfer from the process-level to the user-level via a well-defined communication channel. The system design is based on isolated concurrent processes that ensure system stability and successfully integrate the local control network with the wide network. A messaging system for the local CAN network has been formulated based on transmission of command, data and status messages related to battery management functionality. Performance analysis of the local network and the node organisation has shown the substantial capacity of the proposed system for handling the battery management application. The designed battery network simulation model allows the performance evaluation of various battery application scenarios. The simulation model focuses on the generic components within the management system and encapsulates the primary features of the network organisation. The Extend simulation package has been used in the design of the model. The key criteria of the simulation model organisation and model block design are well defined. Limitations of the simulation package have also been identified.