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Full-order sliding mode control method of energy storage converter based on extended state observer

An expanded state, full-order sliding mode technology, used in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., to achieve reduced impact, good steady-state accuracy and dynamic time, and improved control. Effects of Accuracy and Noise Immunity

Pending Publication Date: 2022-03-01
国网甘肃省电力公司武威供电公司 +1
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Problems solved by technology

This method aims to solve the serious problem of sliding mode control output chattering in DC-DC converters and reduce the impact of disturbance on the system, realize the composite control of sliding mode under the action of time-varying disturbance, and improve the control accuracy and anti-disturbance of sliding mode performance

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  • Full-order sliding mode control method of energy storage converter based on extended state observer
  • Full-order sliding mode control method of energy storage converter based on extended state observer
  • Full-order sliding mode control method of energy storage converter based on extended state observer

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Embodiment Construction

[0059] The present invention will be further described below in conjunction with the accompanying drawings.

[0060] Refer to 1~ Figure 8 , a full-order sliding mode control method for a DC-DC energy storage converter based on an extended state observer, including the following steps:

[0061] S1: Mathematical modeling of the energy storage converter using the switching average method;

[0062] S2: Construct an extended state observer based on the control quantity and the feedback value of the output voltage to estimate the state and disturbance of the system;

[0063] S3: Use the estimated value to design a full-order sliding mode controller, compare the control amount of the controller with the sawtooth wave to obtain a PWM wave, and use the PWM wave to control the switching tube of the DC step-down converter, so that the output voltage of the system can track the reference signal .

[0064] In the step S1, establish as figure 1 The mathematical model of the energy stor...

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Abstract

A full-order sliding mode control method of an energy storage converter based on an extended state observer designs a special sliding mode, the sliding mode utilizes continuous control to realize ideal sliding motion, and a control law avoids singularity of a control system. When the system state reaches a sliding mode and is in ideal sliding motion, the system is represented as a full-order dynamic system instead of a reduced-order system. The invention aims to solve the problem that the sliding mode control output buffeting phenomenon in the DC-DC converter is serious, reduce the influence of disturbance on the system, realize the composite control of the sliding mode variable structure under the action of time-varying disturbance, and improve the sliding mode control precision and anti-interference performance.

Description

technical field [0001] The invention belongs to the technical field of power supply design in an energy storage system, and in particular relates to a full-order sliding mode control method of a DC-DC energy storage converter based on an extended state observer (ESO). [0002] technical background [0003] A DC-type step-down converter is a power electronic device that can reduce an input fixed DC voltage to another DC adjustable voltage, and is widely used in energy storage systems. Since the load is constantly changing in practical applications, it is necessary to perform closed-loop control on the power converter. Sliding mode control has a fast response speed and superior dynamic performance, and is insensitive to parameter changes and disturbances. The research on its control strategy has achieved rich results. For energy storage converters, the commonly used control method in the industry is PID control, which is mainly used in occasions where the accuracy of the outpu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M3/157
CPCH02M3/156H02M3/157
Inventor 梁从斌宋琛龙薛远天赵尔敏窦武张宏甜赵怡彬魏春
Owner 国网甘肃省电力公司武威供电公司
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