Smart Grid Relay Protection Online Calculation System

The accuracy of relay setting is very important for maintaining power grid security and stability. And the online calculation is a necessary requirement for developing relay setting of the smart grid. The paper proposes an engineering design method of online smart power grid relay system based on the widely used energy management system(EMS). The engineering of power grid of Chengdu practice verifies the feasibility and reliability of proposed smart grid online sett relay calculation system. The paper’s main contribution and innovation are as follows:1) By using object-oriented technology and C/S structure, the paper proposed engineering design method of relay protection calculation system based on smart grid online energy management system. The foundation of online relay calculation is able to get real-time, accurate network topology map. EMS has been widely used at all power grid dispatching in the country, which can provide good data platform for the relay calculation. As a result, this kind of platform is benefit to the accuracy of the relay setting. This paper proposes a method of engineering design data directly from EMS, avoiding the tedious basic data entry work, which meet the needs of online operation better.2) The relay calculation system this paper proposed is based on object-oriented technology and data interface development methodology, which can get the power grid model and real-time operation data. In the meantime, the methodology can achieve the communication between the relay calculation system and the fault information system achieving online calculation.3) The paper proposed operation mode with multiple setting automatic switching methods. In order to make more practical automation, the paper lifts all possible topologies based on C / S structure in local client to represent the open-loop point, including planned maintenance, system failure, etc. Besides, the performance of each case under different content and transmitted to the serve. This allows us running quickly for call occurs and graphically configure each map will be generated for the user.