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Current sharing method, device and equipment of output parallel Buck/Boost converters

A converter and parallel technology, applied in the output power conversion device, the conversion of DC power input to DC power output, instruments, etc., can solve the problem of being easily affected by disturbances, to ensure stable and reliable operation, reduce complexity, save energy cost effect

Inactive Publication Date: 2020-06-02
CENT SOUTH UNIV
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Problems solved by technology

[0004] The present invention provides an output parallel Buck / Boost converter current sharing method, device and equipment, the purpose of which is to solve the output parallel Buck / Boost converter current sharing problem and the problem of being easily affected by disturbances

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  • Current sharing method, device and equipment of output parallel Buck/Boost converters

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Embodiment Construction

[0027] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0028] Aiming at the problem of current sharing and susceptibility to disturbance of the existing output parallel Buck / Boost converter, the present invention provides a current sharing method, device and equipment of the output parallel Buck / Boost converter.

[0029] Such as Figure 1 to Figure 9 As shown, the embodiment of the present invention provides a current sharing method for outputting parallel Buck / Boost converters, including: step 1, collecting DC input voltages, two inductor currents and DC output of two parallel Buck / Boost converters Voltage; step 2, taking the two-way input voltage deviation, the inductance value difference and the load change into the system model, and performing a second-order sliding mode control method of the super-disto...

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Abstract

The invention provides a current sharing method, device and equipment for output parallel Buck / Boost converters. The method comprises the steps that 1, collecting direct-current input voltages, two inductive currents and direct-current output voltages of the two paths of parallel Buck / Boost converters; 2, deviating the two paths of input voltages, considering the inductance value difference and the load change into a system model, carrying out a second-order sliding mode control method design of a super-twisting algorithm on the collected two paths of inductive currents and the direct-currentoutput voltage, constructing a sliding mode surface containing an output voltage error and an inductive current error, designing the voltage into an outer ring, and designing the current into an innerring. According to the current sharing method, device and equipment of the output parallel Buck / Boost converters provided by the invention, an additional hardware auxiliary circuit is not needed, thecost is saved, and the complexity is reduced; and meanwhile, the design of a parallel current sharing link algorithm is also facilitated, the method is simple, convenient and practical, and the dynamic and steady state performance and the current sharing effect of the output parallel Buck / Boost converters under the disturbance condition are effectively enhanced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a current sharing method, device and equipment for an output parallel Buck / Boost converter. Background technique [0002] With the rapid development of distributed power generation systems, bidirectional DC-DC converters play an increasingly important role in the energy management of electric vehicles and energy storage. The characteristics put forward higher requirements. During the charging and discharging process of the system, stable voltage and current output characteristics need to be guaranteed. Superior dynamic and steady-state performance is an important condition for the safe and reliable operation of the system. At the same time, in order to increase the system capacity, the interleaved parallel scheme of bidirectional DC-DC converters has also been widely used. The interleaved parallel scheme can effectively reduce the stress on the switching devices, reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/157
CPCH02M3/157H02M3/1584H02M3/1586
Inventor 谢乐蒋崇文
Owner CENT SOUTH UNIV
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