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Fixed-time nonsingular terminal sliding mode control method of DC-DC buck converter

A non-singular terminal, fixed-time technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve the problems of poor stability and low robustness of step-down converters, and achieve good dynamics Performance and Steady-State Performance, Effects of Improving Stability and Robustness

Pending Publication Date: 2022-08-05
STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST +2
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor stability and low robustness of buck converters in the face of mismatch disturbances, and to provide a fixed-time non-singular terminal sliding mode control method for DC-DC buck converters

Method used

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  • Fixed-time nonsingular terminal sliding mode control method of DC-DC buck converter
  • Fixed-time nonsingular terminal sliding mode control method of DC-DC buck converter
  • Fixed-time nonsingular terminal sliding mode control method of DC-DC buck converter

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specific Embodiment approach 1

[0073] Specific embodiment one: the following combination figure 1 and figure 2 Illustrating this embodiment, a fixed-time non-singular terminal sliding mode control method of a DC-DC step-down converter described in this embodiment, it includes:

[0074] Step 1. Establish a buck converter model by the state space method;

[0075] Step 2, using a high-order fixed-time observer to observe the buck converter model to obtain matching and non-matching interferences of the buck converter model;

[0076] Step 3: Design sliding mode variables by using the matching and non-matching interference of the buck converter model;

[0077] Step 4: Using the sliding mode variable to obtain the control signal of the step-down converter through a non-singular terminal sliding mode controller including an integral term, to realize the fixed-time non-singular terminal sliding mode control of the DC-DC step-down converter.

[0078] Further, in this embodiment, the step-down converter model desc...

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Abstract

The invention discloses a fixed-time nonsingular terminal sliding mode control method of a DC-DC buck converter, and belongs to the technical field of power electronic control. The problem that the buck converter is poor in stability and low in robustness when facing mismatching disturbance is solved. A buck converter model is established through a state space method; a high-order fixed time observer is adopted to observe the buck converter model, and matching and non-matching interference of the buck converter model is obtained; designing a sliding mode variable by using matching and non-matching interference of the buck converter model; and a control signal of the buck converter is obtained through a non-singular terminal sliding mode controller containing an integral term by using the sliding mode variable, and fixed-time non-singular terminal sliding mode control of the DC-DC buck converter is realized. The method is suitable for fixed-time nonsingular terminal control of the DC-DC buck converter.

Description

technical field [0001] The invention belongs to the technical field of power electronic control. Background technique [0002] In the past few decades, fossil energy has been gradually exhausted with the development of society. In order to reduce environmental pollution and achieve the goal of sustainable development, new energy technologies such as photovoltaics, wind power, energy storage and electric vehicles have been developed rapidly. . The DC / DC step-down converter developed to adapt to the voltage level required by the load has been widely used in new energy equipment, such as microgrid systems, electric vehicle systems, and DC motor equipment. Taking the microgrid system as an example, the DC / DC buck converter not only needs to provide a steady-state output voltage that meets the requirements, but also effectively reduces the transient influence of the model parameter uncertainty and load changes on the output voltage. Therefore, how to improve the control perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
CPCH02M3/156Y02E10/76
Inventor 郝文波刘壮纪游景菲林欣魄徐睿琦沈肖宁刘健行
Owner STATE GRID HEILONGJIANG ELECTRIC POWER CO LTD ELECTRIC POWER RES INST
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