| In the past 100 years,electric energy has brought unprecedented development support for human beings.However,with the deterioration of the environment and the traditional fossil energy,in the process that the proven reserves cannot supply the sustainable development of human civilization for a long time,human beings can This industrial blood has produced new thinking.Under the premise of satisfying human use,it consumes less fossil energy,develops nuclear energy,and has many clean energy sources.However,under the current energy structure,the people's acceptance of nuclear energy needs to be improved.Various clean energy sources are subject to various known and unknown factors such as geographical conditions,stable Chengdu,and grid-connected safety.Humans think about the power supply side.Rise to a whole new height.With the generation of electric energy,more production tools and consumer goods came into being,and the generation of electric vehicles has invisibly developed a new product category.It can be used as a secondary producer of electrical energy and as a consumer of electrical energy,providing a new method for the production and conversion of electrical energy.The electric vehicle battery has a fast charging/discharging characteristic,and its participation in the grid frequency adjustment is a mode that is inevitably effective in the future.Electric vehicles participate in power grid frequency modulation,and follow the changes of the grid frequency at any time in the case of real-time fluctuation of frequency.Applying the power electronic controller in the electric vehicle battery can eliminate the mechanical delay in the traditional frequency modulation process and reduce the high-speed rotation speed change.Damage to the unit.In this paper,electric vehicles are divided into two parts: charging and discharging.The two modes of controllable load and virtual synchronous machine are used to simulate the adjustment of electric vehicles participating in the grid frequency.When a large power disturbance occurs inside the power system,the electric vehicle is connected,and the intelligent switching is performed under the dual mode of the controllable load and the virtual synchronous machine to improve the anti-disturbance capability of the power system.In the second chapter,the article describes the control strategy and feasibility analysis of electric vehicles participating in power grid frequency modulation.In the third chapter,the differences between the FM model of electric vehicle access and the frequency modulation method of traditional power system and the research of control strategy are expounded.Firstly,the model of the prime mover,generator and other components in the traditional power grid is established.Secondly,according to different models of electric vehicle charging and discharging,the charging mode is simulated as controllable.The discharge mode is simulated as a virtual synchronous machine,and the established interconnected power grid is connected.model.Finally,according to the grid frequency deviation and agc signal,the frequency variation in the grid power disturbance process is adjusted.The results obtained in the simulation show that the electric vehicle participates in primary frequency modulation and secondary frequency modulation,which can significantly reduce the frequency deviation and frequency adjustment time of the system.In the fourth chapter of this paper,it is proposed that electric vehicle substation can participate in power grid frequency modulation as energy relay,which not only can provide sufficient frequency modulation capacity,but also liberate the limited travel of electric vehicles.The concept of the operation mode of the electric vehicle substation,the battery flow direction,the basic combat capability and the frequency modulation standby are given.In the end,the model of S2 G frequency modulation is given,and the correctness of the model is verified by the simulation and the validity of the model. |
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