Research Of Variable Frequency Converter Digital Control Technology Based On DSP

With the emergence of high-performance DSP controller, variable frequency power of digital control can be a reality. Digital control system with high integration, anti-interference capability, control and flexible and can be of advanced control algorithms and facilitate the advantages of real-time control. DSP used as a DC-AC inverter control of the core software can be used very easily to achieve flexible and accurate on-line control and fault detection.This article introduces digital control technologies of a single-phase SPWM inverter based on TMS320LF2407. Frequency Power Supply System described the work principle of the inverter system most commonly used in the sinusoidal pulse width modulation and its methods, as well as analog, digital control circuit advantages and disadvantages. Firstly, the article detail introduces the inverter model and SPWM modulation technology, analytical the SPWM waveform generating mechanism. On this basis, the power of the inverter output waveforms for system control strategy analysis of the study by digital PID control strategy for the dual-loop Fuzzy - PID control strategy, And has carried on the analysis comparison to these two kind of control strategy.Then, in accordance with the technical requirements of variable frequency power supply, hardware made in various parts of the circuit design of the hardware and software required to complete the system design, hardware systems include full-bridge circuit design, DSP-core inverter control systems, drive protection , sampling conditioning, and so on, given the circuit design of the modules. Control System Software inverter focus on the core elements of digital control system design, given the overall structure of the software, waveform SPWM the realization of generating sine benchmark figures and realize inverter logic control, the protection of the inverter, detection of control.Finally, simulation software MATLAB and SIMULINK inverter for the establishment of a simulation model to test the feasibility of control and effectiveness. Its research and analysis of the results of the digital inverter controlled study, improve, and the establishment of a foundation.