Magnetic Controllable Reactor Based On Magnetic Circuit Design Of Distributed Small Sections

With the normalization of long-distance, large-capacity power transmission in our country, as well as the continuous expansion of wind power, the application of reactive power compensation equipment will be more and more urgent, more and more common. In this dissertation, the existing reactive power compensation devices were compared. The advantages and disadvantages of magnetic controlled reactor(MCR) was pointed out. The structure and characteristics of MCR had been carried on the comprehensive analysis. On this basis, in order to improve MCR’s overall performance, its magnetic valve was redesigned and optimized. At the same time, the shortfalls of MCR’s rapidity and harmonic characteristic were analyzed theoretically, a novel improved method was put forward. Finally, a optimal design method of MCR was proposed based on manufacturing and running cost optimal.A simulation model of self excitation type magnetic controlled reactor was set up in PSCAD. It eliminates the process of middle calculation when self excitation type magnetic controlled reactor need equivalent to separate excitation type magnetic control reactor in the past. It is more accurate simulation the mode of self excitation type magnetic controlled reactor when the thyristor switch state changes. The magnetic properties of MCR was analyzed based on the finite element method. The 2D and 3D simulation model of MCR were built in the ANSYS. On this basis, this dissertation put forward that the single magnetic valve in MCR’s core can be divided into several tandem magnetic valve. This new structure can reduce the edge effect of core, and then reduce the leakage reactance, and then reduce the total reactance of windings. Under the same working voltage and control voltage, MCR can output more perceptual reactive current. Through theoretical analysis and ANSYS simulation, the optimal effective number of magnetic valve segments and the optimal length values of the iron core between two section of magnetic valve is obtained.Through theoretical analysis, the mechanism of action which constrained responding speed of MCR is the working winding induced voltage by the direct-current and its inductance loops. A physical design schedule which is even after the first series was proposed. Winding configuration method and its working principle were introduced in detail. Based on that, this dissertation designed a fast response circuit for MCR which can further accelerate the response speed of the MCR. And this dissertation proposed a control scheme for MCR which adopts a DSP/FPGA hybrid system as its control system. Further simulations and experiments show that the structure design and the control circuit and method could ensuring both the excitation and demagnetization of MCR take less than 0.02s.This thesis puts forward a new suppressing method of harmonic wave of MCR. The method is to add harmonic power in the low voltage direct current control winding in order to generate the specific harmonic flux to offset the nonlinear effects of magnetization curve which is due to the core of MCR become saturation after normal work. So that the current which is generated in each branch of working winding does not contain the corresponding harmonic current, thus it can effectively suppress the harmonic generation of the total current. At the same time, this method can modulate with MCR’s control voltage. Adjusting saturation function combining with harmonic suppression function has the advantages of low pressure controlling high pressure and double efficacyAccording to the special structure of the self-excited type magnetic control reactor, through theoretical analysis, we got the tap ratio when the active loss and response time reaches the optimum balance. Using ANSYS and PSCAD simulation verified the validity of the theoretical analysis. At the same time, the MCR was studied as a whole. MCR’s related data which include the iron core structure, winding turns, power loss and so on were optimized calculation. The calculation equation was got when MCR’s operation cost and manufacturing cost are the best.