Research On Technology Of Power Grid Disater Prevention And Dispatch

The demand for power supply reliability is higher in modern society. There will be an immeasurable loss once power supply is interrupted. Extreme external natural disasters threaten to secure operation of power grid. Fully understanding current technology, methods and measures of disaster prevention and reduction in China’s power grid, and summarizing problems and deficiencies of existing method, and using the theory and technology of big data to improve current situation, develop new defensive functions are of great significance to improve capacity of power grid to withstand natural disasters. In this paper, the following studies are carried out.Firstly, the security defense framework of China’s power grid is discussed, current situation and problems are summarized in detail. On the base of inducing big data of power grid disaster prevention, the design scheme is put forward, which aims at solving the existing outstanding problems. A series of important functions are designed in detail, including power grid transmission and distribution capacity evaluation. And data flow and decision logic, and software architecture on the big data platform are designed meanwhile, which aims at improving power grid disaster prevention and dispatch ability.Secondly, a kind of three stage real-time evaluation method for power supply capability of power distribution network with the constraint of transformers’ load capacity is proposed. To solve the problem that existing methods for power supply capability evaluation of distribution network doesn’t consider transformers’ overload capacity, a transformers’ load model is proposed. The model considers winding hot-spot temperature constraint, failure rate constraint, economic constraint, and inspects the increased coefficient via rating risk severity level. Besides, existing methods can’t adapt to complex scenes, so this paper proposes different evaluation principles. The method includes three stages:pre-evaluation, constraint analysis and verification evaluation, and final results are obtained by repeated power flow method. The two simulation results show that the method can provide an assistant making basis for different scenes.Finally, on the basis of above research, development and implementation of Guiyang Power Grid Multi-dimensional Risk Dispatch and Emergency Command System are introduced in detail, including overall process, data interface, each function module, development and operation environment, the hardware configuration, background module organization, and man-machine interface, etc. The system is to provide a variety of disaster prevention and control measures for Guiyang regional power grid operators, and improve the secure operation level of power grid.