Power Access System Stability Control Study

With the developing of power system, there are many power plant with small generation capacity interconnected with weak lines and more and more small capacity interconnected to power gird threaten the stability of power system. The small capacity system is not normally meet local load, and sometimes even larger shortage. Aimed at the different types of system that power plant with small generation capacity interconnected to systems when interconnected-line fault. There is a practical and difficult problem that how to ensure that the small power grids or small plant can be quickly restored stability when separated from system. Since the system has fewer control factors, using BPA simulation program of the China Electric Power Research Institute and orthogonal test of the actual operation of a small power plant systems Commission analysis of the transient stability and the level of stability control measures, and also proved feasibility.Interconnected-operating system could improve the stability and reliability. When the interconnected-line faulted system separated, by means of stability control when two systems operation is stable then intercomnected. In order to interconnect two systems, adjusting governor and excitation system of generations to make system frequency in the range of permission value using NETOMAC procedures simulation proved its character of stability.