Regearch Of Dynamic Reactive Power Compelflsative Equipment Made By Magnetically Controlled Reactor

In order to optimize allocation of the resources and develop long distance bulk transmission technology, the advantages and necessities of UHV AC transmission system are increasing. Reactive power compensation and voltage control are crucial ways in which our UHV AC transmission system operates with security, stability and economy efficiency. Among all the reactive power compensation technology available now, the compensation technology based on MSVC is a fairly ideal compensating schedule in solving the reactive power balancing and voltage controlling problem of ultra high voltage transmission system.Basic operating principles and structure of MSVC were briefly analyzed. Then this thesis focused on core magnetization characteristics of MCR using the piece-wise linear model of the magnetic characteristic curve. Finally precise mathematic model was also established. Besides, according to the mathematic analysis of three iron-core type MCR magnetic circuits, simulation model of four magnetic equivalent circuits were established in PSCAD/EMTDC platform. Moreover accurate switching time of thyristor switched filter was presented though mathematic deduction.As the focus of this thesis, characteristics of MCR were studied particularly including control characteristics, responding speed of capacity adjustment and harmonic characteristics of working current. A novel structure design which was called series winding configuration was proposed and relevant fast excitation control stategy was also necessary to further responding speed of MCR. After analyzing many experiments results, quantitative fast excitation function was given in this thesis. A new conception of four levels harmonic suppression was presented which included noumenon design, connection’s coordination, phase-shifting reactor and thyristor switched filter. Its effectiveness was verified through simulation model.A noumenon design of220V/2.2kvar MCR was discussed in detail which was an over-all design flow schedule and upon which all crucial parameters for MCR design can be deducted. Besides, a three levels control system from top to bottom including touch screen human-computer interface, FPGA+DSP main controller, bottom CPLD module controller and its drive circuits was designed in this thesis. Moreover control strategies were particularly discussed in three aspects:open-loop17section operating strategy, closed-loop constant voltage control strategy, closed-loop constant reactive power control strategy. Reliable control methods of TSF were discussed to prevent frequent switching of TSF which is designed to prevent system instability. According to this, simulation models with closed-loop control algorithm were established in PSCAD platform respectively. The simulation result verified these control strategies’ feasibility and accuracy.