Comprehensive Analysis Of Magnetically Controlled Shunt Reactor Based On ANSYS

Magnetically controlled shunt reactor(MCSR)is generally known to work under a more variety of complex excitation conditions since the iron core is subjected to both AC and DC excitations.MCSR involves cumbersome equations that often make it incredibly difficult to analyze because of its complex nature;for example,a nonlinear electromagnetic equation that entails magnetic field distribution,magnetic flux density and current waveform characteristics.Recently,MCSR has received much attention because of its versatile use in power systems.However,the simplification in modeling and analyzing,it has become a major problem for design engineers and researchers.From this standpoint,it is worth noting that an engineering simulation tool is of great significance for analysis.Therefore,this research work mainly focused on analyzing MCSR using ANSYS Maxwell(ANSYS).The ANSYS is an industrial leading high-performance simulation software that uses finite element analysis to solve and analyze many engineering problems.It can be used to analyze magnetic and electric fields,structures,and other disciplines.The ANSYS Maxwell simulation method is not only simple and convenient,but also it has outstanding advantages in terms of accuracy,time and cost effective.In line with this research work,the main core structure,ferromagnetic materials,magnetic valve,magnetization characteristics and operating characteristics of the MCSR have been studied.Furthermore,the control characteristics,including the effects of tap ratio,control angle and magnetic saturation degree have been analyzed with respect to their relationships,and a simplified mathematical model of the MCSR has been made based on graphical and equivalent electric circuit approaches.The ANSYS was used to build a 3D single phase structure model of MCSR.The magnetic field in the main core and current waveforms in the windings were computed with different controlled DC bias excitations,and were compared with the theoretical analysis and mathematical derivations.Based on the research results,the following conclusions are drawn.It is evidential from the simulation results that MCSRs alternately magnetize and demagnetize in-between the core limbs in one cycle which means that,the magnetic valves on both sides are alternately saturated and unsaturated in the cycle.It has been verified that regardless of the saturation degree of magnetic valves,no saturation phenomenon occurs in the iron core with large cross-section within the whole adjustable range.It is noted that a small difference in the magnetic saturation characteristic curve can significantly affect the performance of the MCSR.Again,the magnetic valve can contribute to the mitigation of harmonics when it is carefully designed.In addition,when designing the MCSR,the effective length of the magnetic circuit,the flux density of the core material,winding resistance,winding turns and rated voltage should satisfy in the selection of the tap ratio value,else,there is a possibility that the MCSR will not function properly.Furthermore,in full agreement with the theoretical analysis it has been proven by the ANSYS simulation that the relationship between the working current and control angle approximately mimic cosine curve.Therefore,this research work has given a vital theoretical basis for the actual engineering design and has provided also a strong foundation for further research of other performance and optimization of the MCSR.