SVG+FC Hybrid Reactive Power Compensation Device Applied In The Study

The problems of low power factor, voltage fluctuation and flicker, frequencychange, three-phase unbalance, high order harmonic component arise along with thehigh-power nonlinear power electronic equipment widely used in the grid. Theseproblems affect the power quality, the efficiency of power transmission and the life ofequipment. In order to improve the efficiency of power supply and the power quality,the reactive power compensation is necessary. Static var generator(SVG) is the mosteffective method of compensation in the power system. It can achieve the reactivepower compensation and can filter out the high order harmonic components. So SVGhas become the current power electronic hot research field.The paper verified feasibility and advantages of the control strategy with acomprehensive analysis after using MATLAB/Simulation software to establish achain model of the SVG system. Regarding to the influence of the electricalequipment to the conventional grid power factor, this article compares the good andbad of SVC and SVG and has a comparison of the TCR+FC and SVG+FCperformance. The result is the SVG+FC adapts the load fluctuations better. Thepaper has measurement and analysis of power quality of35kV substation of a coldrolled production line of a steel factory and puts forward SVG+FC coordinatedcommon compensation scheme. It calculates the reactive capacity to be compensatedwhen the main device is running and selects a hybrid compensation of±6Mvar SVGwith two sets of3Mvar FC. It gets a good compensation result according to themeasurements of power quality after the equipment put into the grid. This paperdiscusses and researches on the problems encountered in the project. There is anuneven current phenomenon in rectifier single bridge arm parallel IGBT in theoperation. It can destroy the IGBT. The article has a detail analysis about thephenomena and arises a improved method to improve the reliability of the SVG.Finally, the main device SVG device parameters are analyzed and calculated includethe power consumption of the set of SVG. They provide a reference of the economicoperation of the scheme and the research of similar system.