Design And Implementation Of Triangular Connection SVPWM Algorithm Based On FPGA

In recent years,with the rapid development of power electronic technology and power semiconductor devices,AC frequency conversion speed regulation technology has also been significantly improved and continuously improved.The space vector pulse width modulation technology(SVPWM)synthesizes an approximately circular flux linkage vector from the perspective of the space voltage vector to control the motor operation.It has the advantages of less harmonic content of the output waveform,small motor torque pulses,high utilization rate of DC side voltage and easier digitization.It's one of the important technologies in the field of AC motor frequency conversion speed regulation.Implementing the SVPWM algorithm based on FPGA can effectively improve the processing capacity and applicability of the control system,so it has attracted more and more attention and become a research hotspot.Firstly,starting from the voltage space vector of the AC motor and the stator flux equation,this article makes a detailed theoretical analysis and deduction of the basic principles of SVPWM technology.Because the phase and amplitude of the space voltage vector of the delta connection and star connection motors are different,based on the traditional SVPWM technology for star connection motors,a delta connection method is derived and proposed Motor SVPWM control algorithm.After the algorithm analysis is completed,a magnetic field-oriented closed-loop control system containing the SVPWM algorithm module is built based on the Matlab/Simulink simulation platform,and the correctness of the algorithm is simulated and verified.At the same time,its simulation results can be used as the criteria for hardware circuit system design and simulation verification.Since FPGA can not directly perform trigonometric functions,square roots and other special function operations,the CORDIC algorithm is introduced to complete the trigonometric function operations and square root operations in the control system,and its working principle and digital hardware circuit implementation process are described,which can effectively improve data calculation.Accurate and save the processor storage unit.Then according to the top-down EDA design ideas,complete the adder,multiplier,CORDIC algorithm calculation module,coordinate transformation module,sector judgment module,basic vector action time calculation module,PWM wave generation module,and dead zone module.Hardware circuit design,build the top-level module to complete the overall system design,and combined with Modelsim to complete functional simulation and timing verification,the simulation results are consistent with theoretical analysis.Finally,the FPGA experimental development board of ALTERA company is used as the control core,and the joint development intelligent development board is used as the inverter circuit to complete the construction of the physical platform.After downloading the designed SVPWM system program to the FPGA chip,the open-loop control of the physical motor is performed.In the end,the motor can run stably.The measured data is consistent with the simulation results,which verifies the correctness and feasibility of the SVPWM algorithm based on FPGA to implement the delta connection.