The Research On AC Drive Systems Based On High-Performance DSP

This thesis is chiefly contributed to the deep study of the AC drive system based on the high performance digital signal processor about control system structure, hardware and software design etc, which the induction motor is taken as control plant, the digital signal processor TMS320LF2407A as control core, interactive MATLAB/SIMULINK as simulation tools. This thesis impressed on modulation strategies of space vector pulse width modulation and the simulation of direct torque control. On the basis of introducing the principles of space vector pulse width modulation, a novel over modulation strategy is proposed and the principle and realization is particularly analyzed by Fourier series analysis, which has proved this strategy can further improve the using of inverter input DC voltage on the basic of efficiently restricting the total harmonic distortion. The arithmetic flow and realization is explained, and the results contrasting with conventional SVPWM are given.In section of simulating realization of the direct torque control, the function block diagram is particularly introduced, and the closed loop control of flux and torque are given impress. Also in this section the simulating system is set up and the result and the torque response characteristic from the DTC theory are presented. The hardware and software's design scheme of all digital AC drive system is proposed based on high performance digital signal processor TMS320LF2407A and Intelligent Power Module (IPM). The function blocks of control system are particularly described and the circuit configurations are given. In allusion to the characteristics of 2407A, the paper puts emphases on the solution of mixed voltage and electrical logic design. It also gives the realization of the system power supply module adopting single chip switching power supply with TOPSWITCH. This scheme make the system design more simple, the structure more compact, the performance more optimized, the reliability more high.The paper also introduces the C programming and mixed program design of DSP, and particularly gives the design of DTC arithmetic in C language which has proved the software design based on C can not only ensure the arithmetic efficiency but also improve its readability. The characteristics and advantages of CAN field bus is introduced in the end. The application circuit of integrated CAN controller in 2407A is proposed, and innovated design the CAN communication board based on EPP mode of parallel port.