Combined nonsingular terminal sliding mode control method of power converter

A non-singular terminal and power converter technology, which is applied in the field of power electronic converters, can solve the problems of slow voltage output response and insufficient anti-disturbance ability, and achieve the effects of improving output quality, improving anti-interference performance, and enhancing anti-disturbance performance

Active Publication Date: 2017-06-20
张家港市华天电子科技有限公司
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Problems solved by technology

[0005] The present invention proposes a composite non-singular terminal sliding mode control method for power converters, in order to solv...

Method used

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  • Combined nonsingular terminal sliding mode control method of power converter
  • Combined nonsingular terminal sliding mode control method of power converter
  • Combined nonsingular terminal sliding mode control method of power converter

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Embodiment Construction

[0062] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0063] Such as figure 1 and figure 2 , a compound non-singular terminal sliding mode control method for a power converter, characterized in that the implementation process of the method is:

[0064] Step 1. Establishment of the average state model of the buck converter

[0065] Such as figure 1 As shown in the schematic diagram of the power conversion circuit, taking the Buck circuit as an example, since the controllable switch tube has two states of "on" and "off", the corresponding converter also has two working modes:

[0066] (1) When the switch VT is turned on, the power conversion state can be described as:

[0067]

[0068]

[0069] (2) When the switch VT is turned off, the state of the power converter can be described as:

[0070]

[0071]

[007...

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Abstract

The invention discloses a combined nonsingular terminal sliding mode control method of a power converter, and relates to a control scheme of combining a sliding mode control method and a disturbance observation technology of a buck converter. According to the invention, first-order nonsingular terminal sliding mode control is enabled to be combined with a nonlinear disturbance observation technology based on an average state model of the buck converter, on-off is controlled by changing the duty ratio of a switching device through adopting a fixed-frequency PWM mode, and thus target voltage output of the buck converter is realized. Provided by the invention is a power converter control method based on combination of a nonsingular terminal sliding mode and the disturbance observation technology so as to solve a problem that traditional sliding mode/PID control is slow in response speed, low in voltage output quality, poor in disturbance resistance and the like. In the control method, the nonsingular terminal sliding mode has the advantages of fast global convergence and high accuracy, and the disturbance observation technology can perform equivalent compensation on the disturbance, so that influences imposed on output voltage by high-frequency vibration are eliminated to a great extent, and thus the anti-disturbance performance of the power converter control system is improved.

Description

technical field [0001] The invention relates to the field of power electronic converters, and specifically uses non-singular terminal sliding mode technology to improve the dynamic performance and steady-state performance of the output voltage of a step-down converter, and uses nonlinear disturbance observation technology to compensate disturbances, thereby further weakening the sliding mode. Chattering widely exists in mode control. Background technique [0002] At present, in the actual control process of the converter, the sliding mode control is favored because it has some advantages that other controls do not have, such as fast response and insensitivity to parameter changes. It is used in power systems, robot control, aircraft and other fields. widely. Due to its own characteristics, when the state trajectory is near the sliding surface, the system has chattering due to inertia, time and space lag and other reasons. In order to solve this problem, the boundary layer ...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/156H02M3/1566
Inventor 马莉倪媛媛丁世宏刘陆
Owner 张家港市华天电子科技有限公司
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