Discontinuous second-order sliding mode control method for direct-current boost converter

Abstract

The invention discloses a discontinuous second-order sliding mode control method of a direct-current boost converter, and belongs to the field of power electronic converters. The direct-current boost converter is a variable-structure nonlinear system, and a traditional linear control method is difficult to obtain relatively good dynamic and static performance, so that the discontinuous second-order sliding mode control scheme is provided. The method mainly comprises the following steps of: 1, according to the working principle of the direct-current boost converter, with system disturbance considered, establishing a nonlinear mathematical model; 2, designing a sliding surface to enable a closed-loop system to have an expected movement track; and 3, designing a sliding mode controller to enable the movement track to slide to a balance point along the sliding surface. According to the method, the adverse effect caused by nonlinear disturbance of the direct-current boost converter can be weakened essentially based on the direct-current boost converter mathematical model design which is closer to reality; and output voltage can quickly track a target voltage value, and the closed-loop system has better dynamic and steady-state performance.

Description

technical field [0001] The invention relates to the control technology of a DC boost converter system, which belongs to the field of power electronic converters, and specifically uses a designed discontinuous second-order sliding mode control method to improve the control performance of the boost converter output voltage, speed up the response speed, and enhance Anti-interference ability. Background technique [0002] With the rapid development of power electronics technology, the application field of switching power supply continues to expand. As a commonly used DC boost device at present, DC boost converter is a kind of DC-DC switching power supply, which has been widely used in electronics, computers, aerospace and other fields. Since the DC boost converter is a typical nonlinear time-varying system, the modeling, stability and output voltage performance of its non-ideal components are the focus and difficulty of the control community. The traditional linear control met...

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Problems solved by technology

[0004] The present invention proposes a discontinuous second-order sliding mode control method for a DC boost converter, in order to solve the problems of poor anti-interference ability, low output voltage quality, and slow voltage output response speed in traditional control methods.

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