Researching On The Application Of Dynamic Reactive Power Compensation Of Magnetic-valve Controllable Reactor

With the development of social economy, people ask for higher quality of powersupply. The reactive power balance of power system plays a crucial role in improvingthe quality of power supply and the economic advantages of the whole power grid.Facing the features of electricity enterprises like large capacity, large load impact,frequent braking and fast speed, the traditional reactive power compensation devicecan no longer meet the needs of the current electricity power enterprises and powersystem. And thus comes the new type of dynamic reactive power compensationdevice---Magnetic-Valve Controllable Reactor (MCR) type Static Var Compensator(SVC), the advantages of which include high reliability, convenience of maintenance,small harmonic waves, wide scope of application, low cost and continuouslyadjustable capacity. Therefore, it is a kind of dynamic reactive power compensationdevice with a high cost-performance ratio.This thesis mainly studies on MCR-SVC and its application in the load withdynamic changes. The first part is a detailed research and analysis on the structure ofMCR and how it works. Through the combination of theoretical analysis andsimulation analysis，the volt-ampere characteristic, control characteristic, harmoniccharacteristic, active loss and response characteristic of MCR are analyzed, and eachcharacteristic curve is drawn.In the second part, the primary factors affecting the response time of MCR arefound in the research of its response characteristic. And on that basis, several methodsof improving the response speed are put forward and the theoretical feasibility of eachmethod as well as the complexity and difficulty of practical application are pointedout, with appropriate simulation analysis and evaluation.In the last part, MCR-SVC is applied in the steel rolling power system. Based onthe feature that MCR usually cooperates with the Fixed Capacitors (FC) oncompensation when it is applied to load reactive compensation, the design proceduresand the design flow of MCR+FC are analyzed, and the detailed flow diagram is drawn. According to the actual load of some rolling line, models of the steel rollingload and the whole reactive power compensation system are made inMTALAB/SIMULINK. And the correctness of MCR+FC program and the simulationmodel is concluded through the comparison of the simulation result of the systemwith the measured data in the aspects of power factor, harmonic ampere and others.It will be proved that MCR-SVC used in steel rolling load can entirely meet therequirements of dynamic reactive compensation. Surely MCR-SVC will be widelyapplied in the future.