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Single-phase PWM rectifier dynamic performance optimization control method based on active disturbance rejection control

A technology of active disturbance rejection control and optimal control, which is applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., can solve the problem of slow dynamic response and difficulty in effectively suppressing output voltage fluctuations on the DC side and other problems, to achieve good dynamic response speed, reduced dependence on sampling accuracy, and good system robustness

Inactive Publication Date: 2018-11-16
YANSHAN UNIV
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Problems solved by technology

DQ current decoupling control has multiple PI links, and the dynamic response speed of the system is slow. When the load changes or there is a disturbance, it is difficult to effectively suppress the output voltage fluctuation of the DC side.

Method used

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  • Single-phase PWM rectifier dynamic performance optimization control method based on active disturbance rejection control
  • Single-phase PWM rectifier dynamic performance optimization control method based on active disturbance rejection control
  • Single-phase PWM rectifier dynamic performance optimization control method based on active disturbance rejection control

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0019] A method for optimizing the dynamic performance of a single-phase PWM rectifier based on active disturbance rejection control in the present invention. The ring adopts active disturbance rejection control; the specific content includes the following steps:

[0020] 1. According to the principle of power conservation, the output DC voltage u of the single-phase PWM rectifier is derived dc and the active DC component i of the grid-side AC voltage sd mathematical model.

[0021] ADRC has the characteristics of simple algorithm, easy implementation, and strong anti-disturbance ability. It is mainly composed of three parts, nonlinear tracking differentiator (TD), extended state observer (ESO) and nonlinear error feedback (NLSEF). ,Such as figure 1 shown.

[0022] The ADRC controller is introduced into the voltage outer loop of the single-...

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Abstract

The invention discloses a single-phase PWM rectifier dynamic performance optimization control method based on active disturbance rejection control. The method adopts double closed-loop control of a voltage outer loop and a current inner loop, the current inner loop adopts single-phase DQ current decoupling control and the voltage outer loop adopts active disturbance rejection control. In particular, according to the principle of power conservation, a mathematical model for active DC components isd of single-phase PWM rectifier output DC voltage udc and grid-side AC voltage is deduced; and according to the mathematical model, a voltage outer loop active disturbance rejection controller is designed. In comparison with the traditional single-phase DQ current decoupling control voltage outer loop adopting PI control, the voltage outer loop in the invention adopts active disturbance rejection control, and while grid-side unit power factor operation and DC-side voltage stable control are realized, the dynamic response speed of the system is better and the anti-interference ability is stronger.

Description

technical field [0001] The invention relates to single-phase PWM rectification technology, in particular to a method for optimizing the dynamic performance of a single-phase PWM rectifier based on active disturbance rejection control, and belongs to the technical fields of power electronic conversion technology and intelligent control. Background technique [0002] Compared with diode uncontrolled rectification, single-phase PWM rectifier has the advantages of sinusoidal input current, high power factor, and reversible energy flow. It has been widely used in grid-connected power generation of renewable energy such as solar energy, electric vehicle charging, and railway locomotive traction. application. At present, the control strategies of single-phase PWM rectifiers are mainly divided into direct current control and direct power control. Among them, direct current control includes hysteresis current control, transient current control, DQ current decoupling control and pred...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 于维洋李雪
Owner YANSHAN UNIV
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