Synchronous High-Voltage Inverter Induction Motor Vector Control Research

High frequency control technique involves high-power AC motor speed control various loads and energy saving, Its use has become an important technology in the field of power electronics. H-bridge cascaded multi-level inverter is one of the important topology, modular engineering design, the use of low-voltage components to achieve high-voltage inverter output and other features, easy to inverter failure redundancy. Since the H-bridge cascaded multilevel inverters requiring real-time control of a plurality of power switching devices, How to make more precise control and easy has become a multi-level inverter hot and difficult research. Therefore it has important theoretical and practical value for the study of cascade multi-level inverter topology and the study of multi-level pulse-width modulation strategy.Paper main research work is as follows:It describes the present situation of high-voltage inverter, especially the development of high-voltage inverter cascaded, analyzes the research focus in the multilevel inverter, a variety of topology structure, control technology and the modulation method. On the basis of space vector pulse width modulation control technology made a more in-depth research, based on MATLAB/Simulink simulation platform built induction motor high voltage inverter space vector pulse width modulation simulation system, the simulation results verify the space vector pulse width modulation technology can effectively applied to high voltage frequency conversion speed adjustment, which laid a foundation for the design of the control system platform.Comparative analysis of the current mainstream of the diode clamp, fly across the capacitor clamping and cascade more electricity equal three kinds of multilevel inverter topology and its advantages and disadvantages, and the ladder wave pulse width modulation, the harmonic elimination PWM carrier phase-shifting sinusoidal pulse width modulation technology, such as the advantages and disadvantages of three kind of multilevel inverter modulation strategy, analyses the model cascade multilevel inverter topology structure and the corresponding carrier phase-shifting sinusoidal pulse width modulation strategy. Proposed applied to three-phase induction motor based on 12-channel fault displacement cascade multi-level phase synchronous high-voltage inverter technology and methods, this method is low cost, high precision to achieve the displacement output phase shift waveform, On the basis of cascaded multilevel inverter space vector pulse width modulation control technology to do a more in-depth study.Completed the induction motor synchronous high voltage inverter system platform design. Based on DSP and FPGA (TMS320F2812, EP2C8Q208CN) completed the core controller, power unit, inverter circuit, drive circuit and protection circuit, control circuit, SPI communication circuit, the circuit design, realized the carrier phase shifting type cascade multilevel inverter is designed, the experimental results verify the high precision carrier phase-shifting cascade type high voltage inverter modulation strategy is correct. On this basis, set up a space vector pulse width modulation control system, based on DSP of the space vector pulse width modulation control code, to achieve the space vector pulse width modulation strategy, the experimental results show that based on space vector pulse width modulation control strategy of high voltage inverter can effectively realize high precision control signal output.