A fractional-order sliding mode control method for step-up/step-down converters is proposed
A buck-boost converter, fractional-order sliding mode technology, applied to control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems such as differences and inconsistent control effects
Active Publication Date: 2019-01-18
NORTHEASTERN UNIV
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Problems solved by technology
In power electronics, inductance and capacitance are actually fractional order rather than integer order, so the DC converter is actually a fractional order system. In the existing control methods, it is approximated as an integer order for controller design According to the analysis, the obtained control effect is inconsistent with the actual situation, and there is a big difference
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[0098] The invention will be further described below in conjunction with the accompanying drawings and specific implementation examples, a fractional-order sliding mode control method for a buck-boost converter, such as figure 1 shown, including the following:
[0099] (1) Establishment of fractional order mathematical model
[0100]The circuit schematic diagram of the Buck-Boost converter is as follows: Figure 22 As shown, V i Is the DC input voltage, T is the power switching device, generally MOSFET or IGBT and other components, by adjusting the turn-on and turn-off time of T, the output voltage V can be adjusted o The size of D is the freewheeling diode, which maintains the flow direction of the current in the circuit. L and C are inductance and capacitance, which are the main energy storage components in the circuit. When the switching device T is closed, the power supply transfers energy to the inductor, and the electric energy storage on the inductor increases; when ...
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The invention provides a fractional-order sliding mode control method of a step-up / step-down converter, which comprises the following steps of: establishing a fractional-order mathematical model; designing a fractional order sliding mode variable structure controller; performing ripple analysis based on fractional order model; the fractional-order mathematical model of step-up and step-down converter is established, it is proved that the integer-order model is an approximation of the actual physical system by analytical calculation and simulation, and the fractional-order model can better reflect the internal characteristics of the actual physical system because of its own memory and genetic characteristics. the fractional-order sliding mode controller is designed. compared with integer-order sliding mode controller, the robustness of the controller is improved greatly, the output characteristics of the system are further improved, and the anti-disturbance ability of the system is enhanced. From the simulation results and hardware circuit simulation results, it can be seen that the fractional-order sliding-mode controller output voltage stability, further explains the necessity andrationality of the fractional-order controller.
Description
technical field [0001] The invention belongs to the control field of a buck-boost converter in a DC converter, and in particular relates to a fractional-order sliding mode control method of a buck-boost converter. Background technique [0002] As a communication device, DC / DC converter is one of the indispensable parts of civil service. With the development of science and technology, DC / DC converter is used in more and more devices and the requirements are becoming more and more stringent. Among them, the Buck-Boost converter is a commonly used DC / DC converter, which can convert a fixed DC voltage into a variable DC voltage, which is flexible and convenient, and can realize controllable adjustment of the output voltage. Buck-Boost converter has the advantages of fewer electronic components, simple structure, low cost and high energy utilization rate, and has become the main equipment for electric energy conversion and control, and is widely used in data communication, office...
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IPC IPC(8): H02M3/158
CPCH02M3/1582
Inventor 李志鹏郑艳
Owner NORTHEASTERN UNIV