Modulation method for phase shifts among bridge arms of isolated modular multi-level DC-DC converter

A modular multi-level, phase-shift modulation technology, which is applied in the direction of conversion equipment with intermediate conversion to AC, adjustment of electrical variables, conversion of DC power input to DC power output, etc., can solve the limitation of the number of voltage waveform steps on the AC side, It is impossible to realize the capacity exchange between the upper and lower bridge arms and the voltage balance control between the bridge arms, so as to achieve the effect of alleviating the content of high-order harmonics, reducing electromagnetic interference, and reducing the rate of voltage change

Active Publication Date: 2016-12-07
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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  • Modulation method for phase shifts among bridge arms of isolated modular multi-level DC-DC converter
  • Modulation method for phase shifts among bridge arms of isolated modular multi-level DC-DC converter
  • Modulation method for phase shifts among bridge arms of isolated modular multi-level 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 pointed out that for those of ordinary skill in the art, a number of modifications and improvements can be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

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

[0025] f...

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Abstract

The invention provides a modulation method for phase shifts among bridge arms of an isolated modular multi-level DC-DC converter. According to the method, phase shift angles are introduced among various bridge arms of the modular multi-level DC-DC converter to generate a quasi two-level waveform of which the number of edge steps is 4N+1 on an AC side. The quasi two-level waveform with a greater number of steps is generated on the AC side, so that the voltage change ratio of the AC side is further reduced, electromagnetic interference is reduced, and meanwhile, the higher harmonic content of AC voltage and insulation impact on a transformer are relieved.

Description

Technical field [0001] The invention relates to a modularized multi-level transformation technology for power grids, in particular to a phase shift modulation method between the bridge arms of an isolated modularized multi-level DC-DC converter, and is suitable for modularized multi-level power transmission in medium and high voltage DC transmission and distribution networks. Flat DC-DC converter control and modulation. Background technique [0002] The 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 the medium and high voltage DC grid. The use of isolated modularized multilevel DC-DC converters can not only overcome the above shortcomings but also meet the reliability requirements of the DC power grid. The circuit topology is such as figure 1 As shown, the primary and secondary sides of the isolation tran...

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Application Information

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Patent Type & Authority Applications(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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