Application Research On Power Monitoring Of Wireless Sensor Networks

With the rapid development of sensor technology, modern wireless communication technology, micro-computer technology and micro-electro-mechanical systems(MEMS), the wireless sensor network(WSN) as a new data acquisition technology, has gained more and more applications in the fields of national security, environment and health monitoring, smart home system, and data acquisition, etc.This paper proposed an improve method for hardware and software design of GPRS remote reading/ monitoring system to adapt to demands of field state monitoring and watt-hour meter data acquisition, based on the investigation of present network protocols and structures of WSN. In the proposed method, WSN is combined with GPRS to establish a three-level remote reading/ monitoring system, which was consists of the terminal node, the convergent node and the remote monitor center. Hardware of terminal node is designed and manufactured, and data transmission between convergent node and remote monitor center is implemented in the paper. In addition, this paper also designed the data frame structure of terminal node and convergent node, the data processing flow of self-organizing RF network, and carried out RF communication test.The main works of this paper are as follow:1) The three-level WSN structure, the data frame structure, and the program flows are designed after analyzing network structures and protocols of conventional WSN. RF communication tests are carried out to verify the practicality of the design.2) WSN is combined with Commercial mobile communication technology, establishing a field state monitoring and watt-hour meter data acquisition network. The network is used to implement information exchange between monitored equipment and monitoring center, remote data acquisition and control, and to establish the epc system network between the field power consumption and the Internet.3) This paper greatly changed field unit of the field state monitoring and watt-hour meter data acquisition system. Hardware and software are also re-designed to improve and perfect the system performance:Increase an under-voltage or under-current alarm interface as well as another two reserved alarm interfaces;An infrared camera with standard RS-232 interface was added to the system to acquit multi-point and multi-angle photos; RF communication modules are added to the system to establish a field-covered RF network to realize omnibearing monitoring;Memory capacity are extended with ferroelectric memory;All data of domestic watt-hour meter (with DL/T-645-1997) can be collected;Data can also be collected from foreign watt-hour meter (with IEC1107);Information that responds to users are changed from English to Chinese to improve readability.The above functions of established systems are verified with field tests.