Electromagnetic Properties And Reliability Research Of Control Of Magnetically Controlled Reactor

Reactive compensation and reactive balance could improve the stabilization of the power system and increase the transmission ability, which was very important to improve quality of electricity and the efficiency of the power system. According to the development trend of power industry, researching and application of novel reactive power compensation device was a key technical issue which was needed to be solved urgently. It’s the background of the birth and development of Magnetically Controlled Reactor, MCR. MCR was a new kind of flexible AC transmission device, which had many advantages such as lower harmonics, fast responsed, adjusting automatically and smoothly according to the change of reactive. It’s a good choice for compensating reactive and adjusting voltage of the power system.This paper analyzed the working principle of MCR firstly. Then establishing a mathematical model through five operating states of MCR and analyzing the transitions between each state. Simulation waveforms from the mathematical model and experimental waveforms were similar by compare with each other. It meaned that this mathematical model was right. What’s more, The simulation wavesform showed that the larger DC bias was, the larger current would output. It meaned that the output current of MCR was closely related with DC bias. So DC bias determined the output reactive of MCR.Then analyzing the magnetic circuit of MCR by used of finite element analysis software, ANSYS. Establishing a single-phase model with four-poster of MCR. Magnetic line of force and magnetic flux intensity of magnetic valve section of MCR changed when applying different amplitude of DC to MCR through ANSYS. The larger DC was, the more intensive magnetic line of force and the larger of magnetic flux intensity would be. As magnetic flux density was closely related with the output current of MCR, so DC bias effected the output current of MCR, thereby effecting the output reactive power of MCR.As the DC bias was controlled by the conduction time of thyristor, the key of this control system was to control the conduction time of thyristor reliably. This paper researched the raliability of control of thyristor from two aspects, hardware and software, finaly. The research of hardware included protection, filtering harmonic, the precision of synchronization signal and reliable triggered of thyristor and so on, which could improve the reliability of hardware. Software contained FFT algorithm, programs which could generate pulse and PID algorithm. The research of software included reducing the computation of DSP, increasing accuracy, ensuring the accurate of the trigger timing of thyristor and automatic control algorithm and so on, which could improve the reliability of software. Achieving the reliable control of thyristor ultimately by improving the reliability of both hardware and software, thereby improving the reliability of operation of MCR.