Research On Optimization Of Variable Frequency Drive System Of Circulating Water Pump Of Heat Exchange Unit Based On FPGA

At present,due to the continuous development of society,heat exchange equipment has also been used on a larger scale.Heat exchangers and heat exchange units play a vital role in urban heating,chemical and other energy industries.In the face of the country’s requirements for building an energy-saving society,energy equipment needs to adapt to the development of the times and make improvements.With the rapid development of control technology and variable frequency drive technology,FPGA technology is also more used in industrial control.Applying FPGA to the water pump variable frequency drive system of heat exchanger units faces problems such as insufficient internal space in the system control cabinet,insufficient efficiency of the original variable frequency drive technology,and mismatch of algorithms.This article studies the internal hardware,control technology and algorithm of the water pump variable frequency drive system of the heat exchange unit with FPGA as the core.Firstly,after analyzing the key points of energy saving faced by the variable frequency of the circulating water pump motor of the heat exchange unit and finding its theoretical model,the commonly used variable frequency drive speed control technology on the market is analyzed and compared.After using FPGA as the core controller,higher requirements are put forward on the volume and internal space of the system control cabinet.The DC reactor in the variable frequency drive system takes up a larger volume.Use Matlab to establish a simulation model of the three-phase frequency conversion system where it is located.,Find the most suitable DC reactor under the condition of maintaining system stability.Secondly,the top-down design mode is used in FPGA to realize the SVPWM control technology,and the simulation of SVPWM control technology in Matlab is compared with the FPGA simulation results to verify its correctness.Finally,the PID algorithm used for the frequency conversion of the water pump in the heat exchange unit is theoretically analyzed,and the mathematical model of the system where the heat exchange unit is located is used to simulate the PID algorithm in Matlab,which verifies the stability and reliability of the traditional PID algorithm in the variable frequency control of the water pump of the heat exchange unit.On this basis,a digital PID algorithm is proposed.The data processed by FPGA are all discrete quantities.The combination of incremental digital PID algorithm and FPGA’s high-speed data processing capabilities can effectively improve the stability and anti-interference of the overall system.In summary,this article studies the water pump variable frequency drive system in the FPGA-based heat exchange unit,streamlines the volume of the DC reactor used in the variable frequency drive in the system control cabinet,and optimizes the internal space of the system control cabinet.Adjust the control technology of the variable frequency drive system for water pump and use the digital PID compatible with FPGA in the algorithm,which improves the control efficiency and stability of the variable frequency drive system for water pump.