Controlled Adjustable Reactor Based On Magnetic Potential Self-Balance

In electric power system,insufficient or surplus reactive power will affect the quality of the supplied power severely.By appropriate compensation,the power factor of the system is kept at a higher level to improve the quality of the system.Meanwhile,along with expanding power network,The fault current has increased greatly.It will bring hidden troubles to the security,stability,credibility of the power system.conventional current limiters gradually show their limitation and can't fit the request of high power quality.In the foundation of consulting the domestic and foreign adjustable reactor research results,the paper has analyzed each kind of adjustable reactor's advantages and disadvantages,and combining with present research status of pulse width modulation(PWM) technology and the electric power electronic switching technology, proposes a new magnetic potential self-balance adjustable reactor base on IGBT's PWM control module.It is composed of inductor and capacitor,and they composed of power frequency series resonance.A IGBT and four Power Diode composes of the bidirectional electric power electronic switch,then the switch parallels on the capacitor's two ends. Through controling IGBT's gate trigger pulse duty,it can change its equivalent impedance, realizes the impedance continuously adjustable.This paper first reviews the adjustable reactor's developing process and the present situation, has pointed out the phase-controlled's disanventage which will bring harmonic pollution.Then it diacusses the development of pulse width modulated (PWM) technology and the electric power electronic switching technology.Then it describes the structure characterization of main circuit and principle of operation,and diacusses the hardware design.Finally,simulates the adjustable reactor application of Matlab,shows it realizes the initial demands.