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Direct-current transformer input voltage balance control method based on model prediction

A technology of DC transformer and input voltage, which is applied in the direction of DC power input conversion to DC power output, control/regulation system, and conversion equipment with intermediate conversion to AC, which can solve the problems of poor control stability of DC converter and achieve guarantee The effect of reliable operation

Pending Publication Date: 2021-07-30
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a DC transformer input voltage equalization control method, device and control system based on model prediction. The input voltage of each DAB module on the input side is balanced to ensure the reliable operation of the ISOP cascaded converter, thereby solving the technical problem of poor control stability of the existing DC converter

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  • Direct-current transformer input voltage balance control method based on model prediction
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  • Direct-current transformer input voltage balance control method based on model prediction

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[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0039] The main structure of the ISOP type DC transformer involved in the present invention is a dual active bridge (Dual active bridge, DAB) DC converter with M inputs connected in series and outputs connected in parallel, and its structure is as follows figure 1 shown. The total voltage of the DC bus on the input side is V dc , the total current of the DC bus on the input side is I in , the...

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Abstract

The invention discloses a direct current transformer input voltage balance control method based on model prediction, and belongs to the field of direct current converter control, and the method comprises the steps: calculating an input voltage reference value Vinref through the input voltage vinj (k) of each DAB module in a k-th switching period; using the input total current iin(k), the output voltage vo(k) and the output load current io(k) to predict an input voltage vinj(k + 1) and an output voltage voo(k + 1) in the (k + 1)-th switching period; calculating a target function J and an intermediate parameter Pj of each DAB module by using a difference value between vinj(k + 1) and Vinref and a difference value between voo(k + 1) and Voref; when the control objective function J is minimized, determining per unit output power puj(k) of each DAB module based on the Pj; and selecting phase shift angles D1, D2 and D3 by using the per-unit output power puj (k), so the input voltage of each DAB module tracks the input voltage reference value. According to the invention, a PI controller is not needed, the input voltage balance of each DAB module on the series input side is realized from the parameters of the circuit, and the reliable operation of the ISOP cascade converter is ensured.

Description

technical field [0001] The invention belongs to the field of DC converter control, and more specifically relates to a model-based prediction-based DC transformer input voltage equalization control method. Background technique [0002] In the field of high-power DC conversion, due to the limited capacity of a single converter and the limited voltage stress and current stress of power switching devices, it cannot meet the power requirements of the system. The modular series-parallel combination scheme can effectively increase the power level of the DC transformer, reduce the voltage and current stress of the power switching device, and enhance the fault tolerance of the system; at the same time, in the modular series-parallel combination scheme, the characteristics of the converter itself have been improved. reserve. In recent years, the combination scheme of Input Series and Output Parallel (ISOP) is often used in the field of DC conversion. [0003] The ISOP cascade system...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335
CPCH02M3/285H02M3/33576
Inventor 张宇陈杨帆
Owner HUAZHONG UNIV OF SCI & TECH
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