Study On Harmonic Analysis And Suppression Of Three-Phase Magnetic Controlled Reactor Based On Two-Stage Magnetic Valve

Electric power,which occupies an important position in the national economy,is an indispensable and important part.In the operation of the power system,a large number of non-linear load increases will lead to grid voltage and current waveform distortion,and inevitably cause power loss.The impact load which takes the electric arc furnace as the representative,and reactive power shortage will cause the grid voltage fluctuations and flicker,a direct impact on the normal production of enterprises and residents of daily life.The distribution of reactive power in the power system is a key factor affecting the system voltage.The system voltage level directly reflects the balance of supply and demand of reactive power in the power system.Therefore,how to maintain reactive power fast compensation and keep local balance systematically is the main task of protecting the system voltage.Magnetic Control Reactor-MCR is one kind of reactors that can be continuously adjusted by adjusting the DC control voltage operating capacity.It uses the magnetic saturation properties of ferromagnetic materials,by controlling the DC excitation on the winding to change the magnetic saturation of the core,and thus achieve the reactor output reactive power continuous smooth adjustment.Compared with the existing active and passive static dynamic reactive power compensation device,in terms of voltage control and integrated reactive power compensation,Three-phase magnetic controlled reactor not only has a wide range of applicable voltage range,large capacity adjustment range,high reliability,small harmonic injection into the power grid,flexible control,fast response and other good work performance,and has significant economic advantages of low cost,simple operation and maintenance.With the large-scale application of three-phase magnetic controlled reactors in power systems,the problem of excessive output current harmonic content is becoming more and more prominent.Based on the structure of two-stage magnetic valve,the harmonic problem of single-phase two-stage magnetic valve magnetron reactor is simplified and the harmonic suppression method is proposed by using the characteristics of symmetrical structure of three-phase magnetron reactor.After optimizing the structure of the two-stage magnetic valve,the finite element analysis software Ansoft Maxwell is used to simulate the theoretical correctness of the two-stage magnetic valve three-phase magnetically controlled reactor.