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A solid-state transformer with uninterrupted operation under fault conditions and its modulation method

A technology for solid-state transformers and fault conditions. It is applied in the direction of output power conversion devices, AC power input conversion to DC power output, and harmonic reduction devices. It can solve problems that affect the normal operation of solid-state transformers, capacitor voltage deviation, and high protection difficulty. problems, to achieve the effect of improving power supply reliability, optimizing harmonic characteristics, and eliminating sideband harmonic components

Active Publication Date: 2021-11-23
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first challenge comes from the relay protection technology of distribution network
At present, the relay protection technology of the AC power grid is relatively mature, and the protection difficulty is low; however, the relay protection technology of the medium and high voltage DC distribution network is not yet mature, and the protection difficulty is relatively high. Currently, the converter topology with DC fault blocking capability is adopted More effective DC fault handling scheme
The second challenge comes from the power supply reliability of the distribution network
However, the patent uses additional duty cycle control to control the capacitor voltage of the MMC sub-module, and the capacitor voltage has a large deviation in the transient process after the fault occurs, which affects the normal operation of the solid-state transformer

Method used

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  • A solid-state transformer with uninterrupted operation under fault conditions and its modulation method
  • A solid-state transformer with uninterrupted operation under fault conditions and its modulation method
  • A solid-state transformer with uninterrupted operation under fault conditions and its modulation method

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Embodiment Construction

[0045] The following is a detailed description of the embodiments of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0046] Such as figure 1 Shown is a topological diagram of a solid-state transformer according to an embodiment of the present invention.

[0047] Please refer to figure 1, the solid-state transformer in this embodiment includes: MMC sub-module units SM and isolated DC converter units IBDC cascaded with each other. It also includes four types of ports: medium voltage DC port, medium voltage AC port, low voltage DC port and low voltage AC port. The sub-module unit SM of the MMC includes: a half-bridge sub-module HBSM and a full-bridge sub-module FBSM; the ratio of the number of half-bridge sub-modules...

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Abstract

The invention discloses a solid-state transformer topology and its modulation method for uninterrupted operation under fault conditions. low-voltage AC, low-voltage DC and low-voltage AC ports; the sub-module unit SM of MMC includes: half-bridge sub-modules and full-bridge sub-modules; the ratio of half-bridge sub-modules to full-bridge sub-modules is 1:1; half-bridge sub-modules and The phase of the modulation wave of its corresponding full bridge sub-module is opposite. The method includes: modulating the half-bridge sub-module and the corresponding full-bridge sub-module by using modulated waves with opposite phases. Through the present invention, the uninterrupted operation of the low-voltage side of the solid-state transformer under the medium-voltage DC bipolar short-circuit fault can be realized, the normal energy interaction between the medium-voltage AC and the low-voltage DC can be ensured during the fault period, and the power supply reliability of the AC-DC hybrid distribution network can be improved. , and can maintain better grid-connected harmonic characteristics.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a solid-state transformer that operates uninterruptedly under fault conditions and a modulation method thereof. Background technique [0002] Renewable energy is often connected to the distribution network in the form of distributed power and converted into electrical energy for end users. However, the operation mode of the traditional distribution network is basically based on the supplier-led, one-way radial power supply, and its power distribution primary control equipment (on-load voltage regulator, contact switch, etc.) And the high-precision real-time operation optimization requirements of the distribution network when the load fluctuates frequently. With the continuous increase of distributed power access, the rapid popularization of electric vehicles, and the continuous increase of energy storage and controllable loads, it is difficult for the existing distribu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219H02M7/483H02J3/36H02J3/01
CPCH02J3/01H02J3/36H02J2003/365H02M7/219H02M7/483Y02E40/40Y02E60/60
Inventor 张建文王浩宇章一新刘亚东施刚周剑桥王晗
Owner SHANGHAI JIAOTONG UNIV
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