Analysis On The Mutual Influence Of Nuclear Power Units Connected To Power Grid Under UHV Environment

With the rapid development of nuclear power in China,shandong power grid,as a province with large energy consumption,has been carrying large-scale nuclear power unit access in recent years.The operating characteristics of nuclear power units are different from those of conventional units,which have the characteristics of large capacity of a single unit,high requirements on frequency and voltage,and sensitivity to grid disturbance.At the same time,nuclear power units have a great impact on the power grid.For example,the sudden load rejection of large capacity units has a huge impact on the power grid.Therefore,it is of great significance to study the interaction between nuclear power units and power grid for shandong power grid,and the research results have certain reference value for the coordinated control of power grid.The influence of nuclear power units on the power grid is closely related to the access mode and operation mode.Firstly,this paper clarifies the requirements for the safety and stability of the power grid,and analyzes the possible influences of the access mode,operation mode and load characteristics of nuclear power units on the power grid.In terms of load characteristics,the different influences on power grid are analyzed in detail from the four aspects of base load,load reduction,load rejection and shutdown.Tracking ability and then from the way of power control,load of three aspects has been clear about the nuclear power units in peak load regulating operation operation characteristic,studied the nuclear power plant and pumped storage unit coordinate control,nuclear power units with controllable load coordinated control mathematical model,and through the example analysis of nuclear power units for the influence of the load of power grid,it is concluded that nuclear power units in accordance with the "(2-10)-2-(10 to 18)-2" load tracking mode in peak shaving.Finally,the interaction between the nuclear power unit and shandong power grid is analyzed.The simulation includes the analysis of the influence of power grid fault,uhv channel fault on the nuclear power unit and the analysis of the influence of the nuclear power unit on the safety and stability of the power grid.The frequency fluctuation and voltage fluctuation caused by the power grid fault affect the stable operation of the nuclear power unit,and the sudden load rejection of the nuclear power unit affects the safety and stability of the power grid.Based on the simulation results,the frequency and voltage regulation measures of power grid after nuclear power generation are given.