Control method of DC-DC converter based on Lyapunov function
A DC-DC and control method technology, applied in the control field of DC-DC converters, can solve the problems of difficult DC-DC converter power conversion efficiency, complicated DC-DC converter related parameters, and too high matrix dimension, etc. The effect of reducing complexity, easy to obtain feasible solutions, and efficient control scheme
Active Publication Date: 2021-09-21
GUANGDONG UNIV OF TECH
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Problems solved by technology
However, when solving the state matrix, there will be more limitations, such as the calculation complexity caused by the high dimension of the matrix
Therefore, the discrete model of the DC-DC converter is greatly limited in practical applications
[0006]
Chinese Patent Publication No. CN111969848A (publication date: 2020-11-20) proposes a control method for a DC-DC converter based on switching control, using a multi-Lyapunov function method based on a piecewise steady Lyapunov matrix. This method solves DC -The relevant parameters of the DC converter are complex, the output error is large, and it is difficult to improve the power conversion efficiency of the DC-DC converter
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[0063] This embodiment discloses the control method of the DC-DC converter based on the Lyapunov function, and the control flow chart is as follows figure 1 As shown, it specifically includes the following steps:
[0064] S1, establishing a switching affine model of a DC-DC converter (DC-DC step-down converter);
[0065] The DC-DC converter is mainly composed of electronic components such as DC power supply Vg, switching element Sw, inductor L, capacitor C, diode D, load resistor R, and inductor equivalent resistor r. The circuit topology diagram is as follows figure 2 Shown:
[0066] In continuous-time mode, the DC-DC converter has two states per switching cycle: on-state and off-state. In one working cycle, the state of the switch Sw is determined by the control circuit to be in the on state or in the off state. The circuit parameters such as current, voltage or power from the input source are then filtered by the L / C output filter to produce a lower DC output voltage. ...
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The invention discloses a control method of a DC-DC converter based on a Lyapunov function. The method comprises the following steps: S1, establishing a switching affine model of the DC-DC converter; S2, designing an expression of an error tracking switching control law based on a segmented time-varying Lyapunov matrix; S3, determining values of undetermined parameters of the error tracking switching control law by solving a linear matrix inequality; and S4, controlling the state of a switching element of the DC-DC converter through an error tracking switching control law sigma (x (k)), and further controlling the output of the DC-DC converter. According to the invention, in the related parameter solving process of the error tracking switching control law, a multi-Lyapunov function method with a segmented time-varying Lyapunov matrix and a sampling control method are adopted, and compared with a traditional common Lyapunov function method, the method has the advantages that the conservative property and complexity of related parameter solving of the DC-DC converter are reduced, the output error of the DC-DC converter is reduced, and the electric energy conversion efficiency of the DC-DC converter is effectively improved.
Description
technical field [0001] The present invention relates to the technical field of circuit control, and more specifically, relates to a control method of a DC-DC converter based on a Lyapunov function. Background technique [0002] As the core components of power electronics technology, power converters exist in almost all power systems in industry and daily life, and undertake important functions in various power systems. According to the different forms of input and output electric energy, power converters can be divided into the following four types: DC-DC converters, DC-AC inverters, AC-DC rectifiers and AC-AC inverters, which realize the common The working feature is to change the basic topological structure of the circuit by adjusting the switch state in the converter, in order to achieve various forms of power conversion and certain circuit output characteristics required by the expected output of the converter. [0003] For the DC-DC converter, its main application is t...
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IPC IPC(8): G05B13/04H02M1/14H02M3/156
CPCG05B13/042H02M3/156H02M1/14
Inventor 李攀硕万力衡鲁仁全李鸿一
Owner GUANGDONG UNIV OF TECH
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