Application Research Of Dynamic Reactive Power Compensation Device In Medium Profile Production Line

In modern large-scale rolling production lines,there are usually many large-capacity rolling mills and other steel rolling auxiliary equipment.The short-term impactless reactive power generated during rolling can cause severe fluctuations in the voltage of the power supply system and low power factor,which seriously endangers the safety of the rolling steel production line.At the same time,due to the need to use AC variable frequency speed control device to drive the motor in the rolling steel production line,a large number of high-order harmonics will be injected into the power grid,causing pollution to the power grid.Therefore,in order to ensure the safe operation and power quality of the rolling steel production line,it is necessary to deeply study the reactive power compensation and harmonic control technologies.In this thesis,the process of Ma Steel’s medium profile production line’s flow and power supply system are introduced in detail.And the impact load’s characteristics and harmonic generation mechanism in the production line are deeply studied.Based on this,the power quality control requirements of the medium profile production line are proposed.Then,the thesis analyze the characteristics of the two traditional dynamic reactive power compensation devices for the power quality problem of the medium profile production line comprehensively and the SVG+FC dynamic reactive power compensation scheme is proposed according to the field conditions.The parameters of each key device,the hardware circuits and the software of the cascaded SVG control system were designed,after the solution established.Finally,the thesis simulate the dynamic reactive power compensation system through the MATLAB simulation software.The simulation results show that the scheme can achieve the design goal.The practical application results also show that the dynamic reactive power compensation device can effectively suppress the harmonic current injected into the grid by the user and maintain the power factor at about 0.95.