Excitation System And Power Grid Stability

As is well known to all, excitation system is the important points to connected generator and power grid which relates to the stabilization of the power angel and voltage. It is not only the important system to stabilize the unit operation, but also the important power grid components involved.Fuqing nuclear power station is located in the south of Fujian,lst-phase project was planned to build two 1000MW class PWR units.At the project liaison conference between FQNPC and fujian power grid in the year 2008, experts presented coming from fujian power grid required that PSS shall be installed in the generator excitation system of FQNPC.In order to study the relationship between the generator system in FQNPC and the stabilization of power grid,we used the RTDS simulation sofeware and accorded to the P320 excitation system parameter and field regulator transfer function block diagram which supplyed by the France ALSTOM company and Dongfang Electric Control Equipment Factory to build the non-linear simulation model of generator and exciter core saturated characteristic,included the generator no-load model and double infinity model.Then we checked the excitation system by Time domain analysis.In the end, we proved the accuracy of the simulation model.Through model verification,we simulated the P320 excitation regulator under the actions of power system fault,the function of PSS and the restriction and protection of excitation to the stabilization of power grid.Then it workout that excitation system could run smoothly and supposed the stabilize of the power grid in the following situations when occurring the proximal,bus or permanent faults in the power grid, otherwise the restriction and protection of the excitatin system has the important affections in the power grid stability and small signal stability.During the simulation,we added the PSS 2A model to proved the PSS in P320 excitation system could restrain oscillation effectively. But Nuclear Power Unit has a longer shafting,PSS in Qingshan Nuclear Power statoin and Daya Bay Nuclear Power Station hasn't bring into service,and thus we shall consider that whether we shall put PSS into service in Fuqing nuclear power station. Finally, this paper summarize the research results and point out that the problem discovered during the research and propose the solutions and recommendations which provids the references to the further design,manufacture and operation in Fuqing nuclear power station excitation system.