Detailed explanation of the control algorithms of six inverter power supplies

The process of converting direct current to alternating current in a circuit is called an inverter, and this conversion is usually achieved by an inverter power supply. This involves the problem of control algorithms in the inverter process.

Only by mastering the control algorithm of the inverter power supply can the mastery of the principle and operation mode of the inverter power supply be realized in a true sense, thereby facilitating the design. In this article, Xiaobian will summarize the control algorithms of the inverter power supply to help you further master the relevant knowledge of the inverter power supply.

The algorithms of the inverter power supply mainly include the following.

Digital PID control

PID control is a control algorithm with decades of application experience. The control algorithm is simple, the parameters are easy to set, and the design process is not overly dependent on system parameters. It has good robustness and high reliability. It is the most widely used and matured at present. A control technique. It has been widely used in analog control sine wave inverter power systems. After digitizing it, it overcomes many shortcomings and shortcomings of the analog PID controller, and can easily adjust the PID parameters, which has great flexibility and adaptability. Digital PID has the following advantages over other control methods:

The PID algorithm contains the main information of the past, present and future in the dynamic control process. The control process is fast, accurate and stable, and has good control effects.

PID control does not rely too much on system parameters in the design process. The change of system parameters has little influence on the control effect, the control adaptability is good, and it has strong robustness.

The PID algorithm is simple and clear, and is easy to implement by single chip or DSP.

There are two limitations to the limitations of using digital PID control algorithms. On the one hand, the sampling quantization error of the system reduces the control precision of the algorithm; on the other hand, the sampling and calculation delay makes the controlled system become a system with pure time lag, which reduces the stability domain of the PID controller and increases the design difficulty.

State feedback control

The state feedback control can arbitrarily configure the pole of the closed-loop control system, realizes the optimal configuration of the pole of the inverter power control system, is beneficial to improve the dynamic quality of the system output, has good transient response and low harmonic distortion rate. However, the dynamic characteristics of the load are taken into account when establishing the state model of the inverter, so the state feedback control can only be modeled for no-load and known loads. Since the state feedback control has a strong dependence on the system model parameters, the parameters of the system are likely to cause the occurrence of steady-state errors and changes in dynamic characteristics. For example, for a non-linear rectified load, the control effect is not very satisfactory.

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