An inverter control system and control method based on active disturbance rejection control technology

Abstract

An inverter control system based on active disturbance rejection control theory, which is composed of a sampling circuit, a drive circuit, an ADRC controller, an I / O conversion module and a PWM generator; its control method is: establish a control quantity model, collect The signal is sent to the ADRC controller, the control law is obtained, and the control signal is output; its advantages are: 1. It has good control quality for nonlinear and complex systems, and has good anti-interference ability; 2. Small overshoot , The transition process is short, it can adapt to the changes of the object model and the surrounding environment in a wide range, and does not affect the control quality of the controller, and has good robustness.

Description

(1) Technical field: [0001] The invention relates to the field of inverters, in particular to an inverter control system based on active disturbance rejection control technology and a control method thereof. (two) background technology: [0002] The PWM method controls the inverter, which has the advantages of convenient frequency modulation and voltage regulation, small low-order harmonics, simple main circuit structure, light weight, low cost, and convenient control and analysis. The PWM type inverter is a closed-loop system composed of a power stage circuit and a control circuit. The circuit topology and the adopted control strategy determine the performance of the system, so it is very important to study the control strategy. Conventional control methods such as traditional linear feedback control cannot achieve satisfactory results for inverters. For example, the use of PID control has faster dynamic response and strong robustness, but after digitization, due to the n...

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Problems solved by technology

Conventional control methods such as traditional linear feedback control cannot achieve satisfactory results for inverters

For example, the use of PID control has faster dynamic response and strong robustness, but after digitization, due to the nonlinearity of the circuit, its steady-state output characteristics are poor; the use of dead-beat control strategy has better steady-state output characteristics and fast dynamic response, but the system parameters fluctuate greatly, and the system modeling is generally inaccurate, especially when the time-varying load occurs, the system will have strong vibration

Looking at power electronic nonlinear systems, it is difficult to obtain satisfactory results with existing controls

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