Research And Design Of SVPWM System Based On FPGA

Space Vector Pulse Width Modulation is a new pulse width modulation technology based on voltage vector space. These years, svpwm technology has been used widely in many situations of adjustment of the speed by frequency conversion. Because it can reduce the harmonic component of the output of the inverter in adjusting the frequency of AC motor, and SVPWM brings down the torque ripple of motor and increase the output voltage of the inverter. This thesis starts with the filed of AC Motor through frequency changes to convert spinning speed, analyzing the realization of AC Motor through frequency changes to convert spinning speed of SVPWM system.Firstly, this paper analyzes voltage space vector when the ideal AC power produces on the AC motor stator and stator magnetic flux equation, and then this thesis gains the ideal circle magnetic flux vector model at the running time of AC motor. And it also analyzes the output voltage vector model that 180 degrees of three-phase inverter is working at the DC voltage,. Finally, by means of controlling the switch mode of inverter, it makes DC power work at the motor in SVPWM modulation method, and then it uses eight kinds of voltage space vectors at rest to compose the circumrotatory voltage space vector. After completing the analysis of the arithmetic, this paper proposes the optimization tactics of the switch loss reduction based on the algorithm above, and it simulates the tactics.After completing the above analysis algorithm of SVPWM, it uses the application of MATLAB/SIMULINK to simulate and analyze the SVPWM algorithm and optimizing strategy. This paper makes the system constructing models procedure and the simulation results as the simulation and design of hardware standard of judging.Finally, the paper makes use of FPGA hardware technology and the development board DE2 of ALTERA, and design a SVPWM system that the frequency is optional. In QUARTUS II environment, using the hardware language to design a module that can use keys and switches to select the frequency, two phase DDS signal generator module, SVPWM algorithm module (including clerke conversion module, switch time of SVPWM wave generated module) and triangular wave module. And then this paper uses Verilog language to relalize the optimization strategy of SVPWM, and it sapreately does the simulation of normal mode and optimization mode of design. This paper makes the contrast of the results of Quartus 2 environment and SVPWM of Matlab, and proves that the hardware design plan is corrent and valid.