Research On Fast Response Magnetically Controlled Reactor Based On IGBT

With the rapid development of China's industry and the increasing power transmission system,the demand for reactive power is also increasing.Compared with other reactive power compensation devices,magnetically controlled reactors have the advantages of simple structure,continuously adjustable,low withstand voltage of power electronic devices,and can be applied to various occasions.However,the slow response speed of magnetically controlled reactors still restricts its development.To this end,this paper proposes a new MCR aimed at improving its response speed.This paper first introduces the structure and principle of the traditional magnetron reactor,analyzes the DC control loop in it in detail,and draws the conclusion that the change rate of the magnetic density in the core depends on the magnitude of the DC voltage.Based on this,a new MCR structure is proposed.The structure obtains a higher DC voltage by adding additional windings on the iron core to obtain power and rectify it,and then adds it to the control loop to make the DC current change rapidly.IGBTs form a fully controlled bridge to precisely control the magnitude of DC current.After that,the magnitude of the control current is used as a control variable to derive its relationship with the MCR output current and harmonic current,so as to achieve precise control of the MCR capacity.Secondly,according to the design theory of the iron core reactor,the body parameters of the magnetron reactor are designed,including the structure and size of the iron core,the selection of the winding,the number of turns and the distribution,and then the leakage inductance and the maximum inductance are calculated according to these parameters,And then calculate the size and height of the solenoid valve according to the preset minimum inductance,and then design a 220V/25kVA small-capacity magnetron reactor according to the design scheme,and establish it in Maxwell model,through the simulation to clear The process of the magnetic field change during the operation of the magnetic control reactor verifies that the magnetic control reactor designed by this scheme can meet the design requirements and control characteristics.Finally,the traditional single-phase magnetron reactor simulation model was established in Simulink,and the fast response magnetron reactor model with the same parameters was verified by comparing the transition time between the two between no-load and full-load.The fastness of the designed magnetron reactor.After that,a single-phase MCR+FC type SVC reactive power compensation model was established,and the algorithms used in MCR to detect reactive power and control output were analyzed,and the algorithm for reactive power detection was improved to make it faster.Detection speed,simulation results show that the MCR designed in this paper can quickly respond to load changes and perform reactive power compensation within 0.1s.