Research On PFC Technology Based On Multi-mesh Narrow Gap Arc Welding Power Supply

As an advanced manufacturing technology in welding technology,narrow gap welding plays an important role in modern industrial manufacturing,among which arc welding power supply is the most important part.In order to meet the requirements of international standards,more and more countries require arc welding power supply to increase the power factor correction circuit.In addition,the power supply voltage of the power grid in different regions of the world is diverse,the power grid parameters in different regions are quite different,and there are single-phase three-phase multi-network power supply application scenarios.As a processing and manufacturing tool,arc welding power source may be sold to different countries and regions,and the current power grid voltage and specifications in different countries and regions are quite different.Therefore,in order to adapt to the fluctuation of network voltage in different regions of the world,it is urgent to realize the adjustment characteristics and dynamic characteristics of arc welding power supply in the case of multinetwork power supply.In this paper,various PFC circuit topologies are listed,and their respective advantages and disadvantages are analyzed.Finally,the three-phase dual-switch PFC circuit is selected as the main circuit topology.This paper first describes the concept of harmonics and related hazards,and briefly introduces the research status of power factor correction technology.Then,various PFC circuit topologies are listed,and Their benefits and disadvantages are analyzed and compared.After comprehensive design requirements and cost considerations,the three-phase dual-switch PFC circuit is selected as the main circuit topology.The converter’s principle of operation was thoroughly examined in the paper,resulting in the derivation of its input-output voltage relationship and determination of the average state model.Next,introduce the design of the system parameters,including the selection of the input inductance of the main circuit,input capacitance and switch tube,which provides data reference for subsequent simulation design.The control strategies commonly used in PFC circuits are summarized.The peak current method,hysteresis current method,average current method and SOGI-PLL control method are introduced respectively,and their advantages and disadvantages are analyzed.After establishing the control strategy of single-phase and three-phase PFC circuits,based on the theory,the simulation models of single-phase PFC circuit controlled by SOGI-PLL and three-phase PFC circuit controlled by average current method with double closed-loop control are built in MATLAB / SIMULINK toolbox,and the single-phase voltage input and three-phase voltage input in different ranges are simulated respectively.Finally,a test prototype that meets the design requirements is built to verify the results under different input conditions of single-phase and threephase.The relevant experimental analysis and test results are given to verify the feasibility of the theoretical analysis.