Research And Simulation Analysis Of Magnetic Control Transformer

The increasing complexity of power network puts forward higher demands on the power system which is not flexible.As an important equipment for voltage level transformation,transformer voltage regulation capacity is also in urgent need of improvement.In order to ensure reliable power supply,new voltage regulation equipment must be developed to cope with the future more complex power environment.Voltage regulation mode without excitation has the disadvantages of switching are,slow switching response,graded voltage regulation,mechanical equipment,prone to failure and so on;Traditional on-load voltage regulation is difficult to quench arc due to its own structure.Although the power electronic transformer has high voltage regulation speed,it has high cost,high loss due to the application of a large number of power electronic devices.Aiming at the above problems,this paper proposes a new topological magnetically controlled transformer,which is connected in series with the traditional power frequency transformer by the magnetically controlled reactor.The magnetically controlled transformer can realize the stepless and smooth regulation of load voltage at the same time of arc quenching and voltage regulation according to the load needs,and the voltage waveform quality is high.This paper proposes and designs the structure of magnetically controlled transformer,analyzes the working principle of magnetically controlled transformer,and deduces its circuit equation and electromagnetic equation in detail.Maxwell and Simplorer of ANSYS were used to establish two-dimensional and three-dimensional models for field-circuit coupling multi-physical domain co-simulation,and their voltage regulating ability was compared and analyzed to verify the feasibility of the model design.Then the magnetic field of the magnetically controlled transformer is analyzed,and the simulation results are consistent with the theoretical analysis.Fourier harmonic analysis of output voltage was carried out by Matlab/Simulink.According to GB/T 14549-1993 "Harmonics of Power Quality Public Grid",the simulation results meet the requirements of national standard.Finally,the flow field analysis software Fluent was used to analyze the temperature rise distribution of the model under the condition of full load.The simulation results were in line with the national standard GB 1094.11-2007,and the rationality of the model design was further verified by temperature rise analysis.