Hybrid topology of cascaded h-bridge multilevel converter and its control method

A hybrid topology and control method technology, applied in high-efficiency power electronic conversion, conversion of AC power input to DC power output, and irreversible DC power input conversion to AC power output, etc., can solve the problem of uneven heat loss distribution, intermediate DC power Voltage imbalance and other problems, to achieve the effect of power loss and intermediate DC voltage balance, reducing the loss gap

Active Publication Date: 2021-11-23
HUNAN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to achieve the above object, the present invention provides a hybrid topology structure and control method of a cascaded H-bridge multilevel converter, which solves the uneven distribution of heat loss of each module of the cascaded H-bridge multilevel structure in the prior art, The problem of unbalanced intermediate DC voltage

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  • Hybrid topology of cascaded h-bridge multilevel converter and its control method
  • Hybrid topology of cascaded h-bridge multilevel converter and its control method
  • Hybrid topology of cascaded h-bridge multilevel converter and its control method

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Effect test

Embodiment

[0071] In the present invention, a single-phase 15 cascaded H-bridge 31 level converter test platform with a capacity of 202kVA is built, and the device selection model is Si IGBT (IKW40N120T2) of 1200V / 75A, Si IGBT (IGW40T120) of 1200V / 75A, 1200V / 50A Si IGBT (IGW25N120H3), 1200V / 36A SiC MOSFET (C2M0080120D), 1200V / 18A SiC MOSFET (C2M0160120D), and other experimental parameters are shown in Table 1.

[0072] Table 1 main test parameters

[0073] parameter value parameter value u s

10kV u d

580V f sw

10kHz m 0.9

[0074] where u s Indicates the grid voltage, u d Indicates the intermediate DC voltage of each module, m is the modulation degree, f sw is the switching frequency. The AC terminal voltage of each module is:

[0075]

[0076] The effective value of the input current of a single module is

[0077]

[0078] The transmission loss of a single-transistor Si IGBT is calculated as follows:

[0079]

[0080] v CE (...

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Abstract

The present invention uses the high-frequency module and low-frequency module separated by the mixed frequency pulse width modulation, and the high-frequency branch and the power frequency branch separated by the unipolar modulation to propose a cascaded H-bridge multi-level converter hybrid Topology structure and control method, first adopt Si IGBT with small transmission loss for power frequency branch, and then provide two solutions with low switching loss for high frequency branch, including using SiC MOSFET in parallel and using SiC MOSFET and Si IGBT in parallel, Finally, the Si IGBT is used as the switching device of the low-frequency module, and the switching function is regularly rotated in the half power frequency cycle. The hybrid topological structure and control method provided by the invention solve the problems of large power loss and uneven distribution of cascaded H-bridge multilevel converters and uneven intermediate direct current voltage in the prior art.

Description

technical field [0001] The invention belongs to the technical field of loss reduction and energy saving of power electronic converters and loss equalization control, and relates to a hybrid topology structure of a cascaded H-bridge multilevel converter and a control method thereof. Background technique [0002] With the large-scale application and development of power electronic technology, power electronic equipment has become the core of high-quality and efficient use of electric energy in various fields of the national defense industry, especially large-capacity equipment. The cascaded H-bridge multi-level structure is favored in medium-high voltage and high-power applications because of its good output waveform quality and easy modular expansion. Its control effect and conversion efficiency play a vital role in improving the energy utilization rate of large-capacity equipment. [0003] The cascaded H-bridge multi-level topology uses switching devices with lower withstan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/483H02M7/5387
CPCH02M7/48H02M7/483H02M7/53871Y02B70/10
Inventor 涂春鸣龙柳郭祺肖凡高家元肖标侯玉超
Owner HUNAN UNIV
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