Study On Electromagnetic Vibration Of Split-Core Controlled Reactor Under AC And DC Excitation

Owing to the excellent operating characteristics of regulating reactive power balance,reducing line loss,suppressing short-circuit current and power grid harmonics,the split-core controlled reactor is widely used in the power system industry.However,due to the particularity of the core air-gap structure and the working characteristics of AC and DC common excitation,the violent vibration of the split-core controlled reactor has become a serious problem.The vibration and noise problem of the split-core controlled reactor not only affects its own working performance,but also affects the surrounding living environment,which has become one of the factors restricting the further development of the split-core controlled reactor.Since the core magnetic field of the split-core controlled reactor is generated by AC and DC common excitation,the problem of DC bias becomes a factor that must be considered.In order to effectively reduce the vibration and noise of the split-core controlled reactor,it is necessary to comprehensively study the relationship between the vibration of the reactor and different DC biases,but at present,research on it is rare.The fundamental causes of the vibration were analyzed which include Maxwell force and magnetostrictive effect,and the vibration characteristics of the split-core controlled reactor were modeled and simulated.The main work is as follows:(1)The modal analysis of the split-core controlled reactor was studied.The modal simulation of the core structure was carried out based on the basic theory of modal analysis and the finite element analysis method,and the modal experiment of the reactor is conducted.Through analysis,the main natural frequency and vibration mode of the reactor easily resonating phenomenon can be determined,so as to avoid the occurrence of resonance phenomenon,and at the same time,it can provide data foundation for subsequent vibration frequency analysis.(2)The magnetic properties of silicon steel sheet under different conditions were tested.Through test,it was found that the magnetization properties and magnetostrictive properties of silicon steel sheet were anisotropic.The magnetization properties and magnetostrictive properties of silicon steel sheet under different DC biases,different stresses and different DC biases and stresses were tested by laser magnetic properties test system.The database was established,which provided a data basis for the subsequent electromagnetic vibration calculation of the split-core controlled reactor.(3)The electromagnetic vibration of the split-core controlled reactor was modeled and simulated.Based on the measured magnetic properties data and energy variation principle,an electromagnetic-mechanical coupling model considering the magnetization and magnetostrictive anisotropy of silicon steel sheet was established.The finite element analysis is used to obtain the magnetic field,stress,vibration displacement and vibration acceleration of the split-core controlled reactor under different DC biases,and the electromagnetic vibration law of the split-core controlled reactor under different DC biases was summarized.(4)The vibration characteristics of the split-core controlled reactor prototype were studied by experiment.Under different DC biases,the vibration acceleration test and spectrum analysis of core air-gap of the split-core controlled reactor were finished.The correctness of the simulation model was verified,which provided a theoretical basis and experimental reference for the vibration and noise reduction.