Research Of No Refresh Technology In Remote Monitoringinterface Based On Rich Internet Applications

At present, SCADA application system mainly adopts client/server mode. Periodically calling its data server, real-time data can be directly obtained by client interface. Due to giving full play to the client’s data processing capabilities, the system has faster response speed and higher real-time performance. With the rapid development of smart grid and computer technology, Faced with more new functional requirements, remote monitoring and control system is updating at the same time. However, the upgrading and transformation requirements of remote monitoring system can’t be satisfied by Client/server pattern, for its complicated configuration, high maintenance cost and difficult expanding. A feasible direction for distributed scheduling monitoring system is provided by network server mode(B/S mode) to realize client’s zero maintenance and zero deployment. This B/S mode puts core of monitoring function in server side, which unifies clients and simplifies development,maintenance and use of system while reducing the cost greatly. But it is bad for adaptability of complex business with power grid scheduling, that support for graphics can be weakened by the traditional web in order to obtain capabilities to response data of thin client. Rich Internet(RIA) technologies provides a new thought of solving problems, which balance abundant processing power of monitoring interface from the client/server and low-cost and zero deployment advantages from network server mode.The paper combines data processing requirements in engineering application with GWT framework, through embedding vector elements into components containers and rich internet application framework. The compile processing flow of key code for Scheduling graphical interface is given, a corresponding real-time database is designed, free deployment and partial refresh are implemented by coordinating GWT cross compiling technology, JSNI native interface and asynchronous callback mechanism supported multiple event thread. Based on embedding Applet components container into rich internet layered framework of scheduling interface processing, a fast GAS dispatch callback model of supporting multiple event thread is put forward by researching SVG data callback processing from zero deployment scheduling monitoring.Take 10 kV distribution network dispatch monitoring system as testing example, SVG interactive experiment of analog quantity and state quantity is done, SVG dynamic update of the monitoring interface is realized to achieve real-time effect of data change. The results of penetration and concurrent test show that the host of asynchronous callbacks gets less than 20 percent of processor and 7 percent of memory share, and the average delay of monitor screenscan be reduced down to the level of hundreds millisecond by using multi-threaded partial refresh. The monitoring efficiency of GAS mode is verified。...