Sliding mode control method of step-down direct current converter based on exponential power reaching law

A technology of a DC converter and a control method, applied in the directions of adaptive control, general control system, control/regulation system, etc., can solve the problem that the robustness performance is not very prominent.

Active Publication Date: 2019-06-18
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] Moreover, the robustness performance of traditional sliding mode control in complex working environments is not very prominent, so when designing sliding mode controllers, how to improve the anti-disturbance performance of the converter system in complex working environments is also a difficulty that needs to be solved urgently

Method used

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  • Sliding mode control method of step-down direct current converter based on exponential power reaching law
  • Sliding mode control method of step-down direct current converter based on exponential power reaching law
  • Sliding mode control method of step-down direct current converter based on exponential power reaching law

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Embodiment Construction

[0114] The present invention will be further described below in conjunction with the accompanying drawings.

[0115] refer to Figure 1-Figure 3 , the step-down DC converter control method based on the improved exponential power reaching law provided by the present invention includes the following steps:

[0116] Step 1. Establish a step-down DC converter system model under the action of time-varying disturbances, such as input voltage perturbation, output load fluctuations, and inductance-capacitance parameter perturbations, and initialize the system state and control parameters. The process is as follows:

[0117] 1.1, the step-down DC converter system model under the action of time-varying disturbance can be expressed in the following form:

[0118]

[0119] Among them, V o is the output voltage, i L is the inductor current, is the input voltage V in Rated value, L 0 、C 0 、r 0 are the nominal values ​​of inductance L, capacitance C and load resistance r respecti...

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Abstract

The invention discloses a sliding mode control method of a step-down direct current converter based on an exponential power reaching law. The method comprises the following steps of (1) establishing astep-down direct current converter system model under a time-varying disturbance effect, initializing a system state and a control parameter, and converting into a disturbed model of the step-down direct current converter; (2) designing an unknown input observer to estimate a time-varying disturbance existing in a step-down direct current converter system; and (3) designing a sliding mode controller based on the unknown input observer and the improved exponential power reaching law, and making the step-down direct current converter system output a stable power voltage. By using the control method, composite control of the time-varying disturbance problem in the system is realized, and control precision and anti-interference performance of the system are improved. And compared with ordinary sliding mode control, by using the method of the invention, an output voltage error convergence time speed is fast, and the improved exponential power reaching law has a faster reaching rate and shorter reaching time, and output chattering is restrained.

Description

technical field [0001] The invention belongs to the technical field of step-down DC converters, and in particular relates to a sliding mode control method of a step-down DC converter based on an exponential power reaching law. Background technique [0002] Step-down DC converter is a power electronic device that can reduce the input fixed DC voltage to another DC adjustable voltage, and is widely used in communications, computers, automobile manufacturing, office automation equipment, medical equipment, military, aerospace Aviation and other fields involve almost every industry in the national economy. [0003] For this type of converter, the control method commonly used in the industry is PID control. The PID control method is mainly used in occasions where the accuracy of the output voltage is not high, and the PID control is sensitive to the change of the system parameters. When the load undergoes a sudden change due to external disturbance, the step-down DC converter co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
Inventor 南余荣杨晨冰邢展鹏陈强
Owner ZHEJIANG UNIV OF TECH
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