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Phase shift modulation method between arms of isolated modular multilevel dc-dc converter

A modular multi-level, DC-DC technology, which is used in conversion equipment with intermediate conversion to AC, adjustment of electrical variables, conversion of DC power input to DC power output, etc. The problems of voltage balance control between bridge arms and limitation of the number of steps of the voltage waveform on the AC side can reduce electromagnetic interference, alleviate the content of high-order harmonics, and reduce the voltage change rate.

Active Publication Date: 2019-08-23
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] Due to the use of the upper and lower bridge modulation pulse complementary methods, the existing modulation scheme cannot realize the capacity exchange between the upper and lower bridge arms and the voltage balance control between the bridge arms, and the number of steps of the voltage waveform on the AC side is limited.

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  • Phase shift modulation method between arms of isolated modular multilevel dc-dc converter
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  • Phase shift modulation method between arms of isolated modular multilevel dc-dc converter

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0024] like figure 1 As shown, the isolated modular multi-level DC-DC converter is built for experimental verification. In the prototype, each of the original and secondary side MMC bridge arms contains four sub-modules, the input and output rated voltage is 200V, and the isolation variable The ratio is 1:1, the rated voltage of each sub-module is 50V, the AC side frequency is 3kHz, and the transfer power of the isolated modular multilevel DC-DC converter is 4.5kW.

[0025] figure 2 A quasi-two...

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Abstract

The present invention provides a phase-shift modulation method between bridge arms of an isolated modular multi-level DC-DC converter. The method introduces a phase-shift angle between each bridge arm of the modular multi-level DC-DC converter to achieve The AC side generates a quasi-two-level waveform with a step number of edges of 4N+1. The invention generates quasi-two-level waveforms with more steps on the AC side, further reduces the voltage change rate on the AC side, reduces electromagnetic interference, and at the same time relieves the high-order harmonic content of the AC voltage and its insulation impact on the transformer.

Description

technical field [0001] The invention relates to a modular multi-level conversion technology for a power grid, in particular to a phase-shift modulation method between bridge arms of an isolated modular multi-level DC-DC converter, which is suitable for modular multi-level power conversion in medium and high voltage direct current transmission and distribution networks. Control and modulation of flat DC-DC converters. Background technique [0002] Key equipment for voltage level, access to DC equipment, and power control. Due to the limitation of switch withstand voltage, the two-level DC-DC conventionally used in the field of switching power supply cannot be used in medium and high voltage DC power grids. The use of isolated modular multilevel DC-DC converters can not only overcome the above shortcomings but also meet the reliability requirements of the DC grid. Its circuit topology is as follows: figure 1 As shown, the primary and secondary sides of the isolation transfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/335
CPCH02M3/28H02M3/33523H02M3/33561H02M3/33569H02M1/0074H02M1/0077
Inventor 蔡旭孙长江张建文
Owner SHANGHAI JIAO TONG UNIV
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