The digital double closed-loop control based on DSP can effectively improve the anti-interference ability of the power system, reduce noise, improve efficiency and reliability, and further facilitate intelligent management, remote maintenance and diagnosis of the power supply. Among the various control strategies of the inverter, the repetitive control technology can effectively eliminate the waveform distortion caused by nonlinear load and interference; the sliding mode variable structure control method can make the system run in a sliding mode, which can ensure the robustness of the system. Intelligent control such as fuzzy control and neural network control does not depend on the mathematical model of the control object, and is suitable for nonlinear systems; the deadbeat control can instantaneously control the voltage, has strong adaptability to the load, and has less total harmonic distortion of the output. The advantages of low loss, simple PID control, and good reliability; the new digital PID control can achieve satisfactory control effects. Each control strategy has its own advantages and disadvantages. If two or more of these control technologies can be combined, better output characteristics will be achieved. Based on this idea, a control strategy combining digital PID control and deadbeat control technology is proposed. Theory and practice prove that this method has broad application prospects.
1 system structure design
The TMS320F2812 chip selected by the system is one of TI's TMS320C28x series, and its instruction execution speed is fast, so that complex control algorithms can be realized on this basis, and the output characteristics of the system can be optimized.
The block diagram of the inverter power supply system based on the chip is shown in Fig. 1. The entire system consists of AC/DC, DC/DC, DC/AC, as well as filter circuits and other auxiliary circuits. Among them, the DC/AC inverter part is an important component of the whole system, and the inverter adopts single-phase full-bridge inverter circuit to adapt to high-power occasions. The output voltage and current sampled by the sampling circuit are converted into a digital signal by the A/D converter of the DSP, and used as a feedback signal of the digital controller, after being compared with the given output signal, and then passed through the control algorithm adjuster and pulse width modulation. The SPWM wave controls the on and off of the IGBT power tube, thereby changing the value of the output voltage to be equal to a given input voltage. The given reference voltage is implemented by software, so the signal is stable without temperature drift and no interference. This control method ensures that the output voltage is not distorted when the load changes rapidly.
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