The Calculation Of Magnetic Field And Loss Of The Magnetically Controlled Saturated Reactor

The magnetically controlled saturated reactor (MCSR) controls its capability with thechanging of the equivalent reactance and the saturated degree of the core by adjustingthe DC excitation, it is an advanced topic with the combination of the traditionalelectrical technology and modern power electronic technology, it involves the non-linercharacteristics of the ferromagnetic materials, high and low voltage, AC/DC mixedsystem with technology and other technical problems. The application of the system cannot only improve the control leave of the reactive voltage, also improve the feedingpower of the line, improve the system stability, limit over-voltage power frequency,restrain the Secondary Arc Current, act. It has very important significance for theoptimization control and sustainable development of our power grid. Along with theuniversal use of the MCSR, the core magnetic field distribution under the AC/DCcommon excitation and the calculation of loss become more and more important.In this paper a10kV MCSR was taken as an example, the core magnetic fielddistribution, core loss, tank magnetic field and tank loss of the MCSR is studied. Thebody structure, connection model and the basic operation principle of the MCSR areintroduced. The2D finite element model of MCSR is built. The core magnetic fielddistribution is analyzed under different working conditions including only DC excitation,only AC excitation, AC/DC common excitation with different DC current. Thecalculation method of the core loss under AC/DC common excitation is proposed, coreloss in different position is calculated including iron core, return yoke, top yoke with thedifferent current. The3D finite element model of MCSR is built, the leakage magneticfield distribution of the tank is analyzed under the rated control current and the loss ofthe tank is calculated. It provides theory basis for the design of the EHV MCSR.