A wireless event-based sensors network for power quality monitoring application

The problem of power quality in power network is a critical task. Several methods based on multi point measurement techniques have been proposed proving a good contribution on this filed. In this paper a wireless event-based distributed measurement system has been developed. The proposed wireless network adopts a two-level hierarchical approach to monitor the power network composed by a sensing parts which perform monitoring on Power Quality (PQ) elements and a the management part which control and provide an access point to the distributed network. The proposed network uses the ZibBee wireless interface to distribute the information and the route the request to the remote measurement systems. The access to the sensor network can be performed using a an asynchronous system or a synchronous system, based on NTP modified protocol, to synchronize the remote. Moreover, the network provides an event-based system: when an event occurs, the remote measurement system notifies the Coordinator node which begins to download the data until the event ends. The data are accessible via a Web service Interface which exports all the functionalities of the proposed sensors network to give a complete control of the whole system.