Loss Calculation Of Reactor Under Sinusoidal Excitation

In the transmission and use of electrical energy,part of energy is dissipated by the core of reactors,transformers and motors,which is called core loss.With the expansion of power grid scale and the multiplication of voltage class,this part of core loss becomes very heavy.In order to respond to the call of country to save energy and reduce emissions,this paper establishes a reactor model to compute its hysteresis loss,which can be used to provide theoretical basis to reactor design and core loss reduction.The main study contents of this paper are as following:1.A magnetic properties test on silicon steel sheet(B50A440)is carried out by using Epstein frame.The results show that magnetic characteristics of the reactor core have hysteresis.2.In order to simulate the hysteresis characteristics of the reactor core,this paper uses J-A hysteresis Model(Jiles-Atherton Hysteresis Model)which has a definite physical meaning.Firstly,a clear and unambiguous deduction for the J-A hysteresis model is given in this paper.Secondly,the J-A hysteresis model parameters are extracted based on the measured hysteresis loop.Lastly,a Simulink module is established to prove the J-A hysteresis parameters extraction.3.Combining the J-A hysteresis model with electromagnetic field numerical analysis,a two-dimensional electromagnetic field finite element method considering hysteresis effect is deduced.4.The electromagnetic field of the reactor in this paper can be equivalent to two-dimensional plane field computation.The magnetic field distribution of the reactor is computed by using the above proposed method.Then the hysteresis loss of the reactor core is calculated by computing the area of hysteresis loop.5.Without loss of generality,a three-dimensional electromagnetic finite element numerical analysis including hysteresis effect is derived.It can be used to handle the case that can not be equivalent to the two-dimensional model.