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Control method for suppressing capacitor voltage fluctuation in modular solid-state transformer

A solid-state transformer, capacitor voltage technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output and other directions, can solve the problems of large capacitor low frequency voltage, large capacitors, fluctuations, etc., to suppress low frequency fluctuations , Reduce the cost and volume of capacitors, and achieve the effect of compactness

Active Publication Date: 2019-08-09
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the number of sub-module capacitors in this topology is large, and there are large low-frequency voltage fluctuations in the capacitors

Method used

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  • Control method for suppressing capacitor voltage fluctuation in modular solid-state transformer
  • Control method for suppressing capacitor voltage fluctuation in modular solid-state transformer
  • Control method for suppressing capacitor voltage fluctuation in modular solid-state transformer

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Embodiment Construction

[0039] 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 changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0040] figure 1 is a schematic diagram of the topology of a modular solid-state transformer; figure 1 As shown in the figure, the whole topology adopts the sub-module (SM) of the Modular Multilevel Converter (MMC) and the dual active bridge unit (Dual Active Bridge, DAB). power transfer between grids, and provide medium-voltage DC, medium-voltage AC, low-voltage DC, and low-voltage AC ports (in this new control scheme, the operation of low-voltage AC ports is not affected, so the following mathematical...

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Abstract

The invention provides a control method for suppressing a capacitor voltage fluctuation in a modular solid-state transformer. The method comprises a step of transmitting a fluctuation amount in half-bridge unit input current to a low-voltage DC port and a medium-voltage DC port according to a preset wave power transmission strategy, and a step of controlling the fluctuation power of the low-voltage DC port and the medium-voltage DC port to maintain self-balancing by modulating a phase shift angle of a dual-active bridge unit. Therefore, the capacitor voltage fluctuation of half-bridge units ina multi-level converter is transmitted to a low-voltage DC side through a dual-active bridge of a back stage, therefore, the low-frequency fluctuation in half-bridge unit capacitor voltage in the multi-level converter is suppressed, the cost and volume of a capacitor are reduced, and the compactness of a device is achieved. In addition, the fluctuating power transmitted to the low-voltage DC sideof each half-bridge unit achieves self balance, and the normal operation of the low-voltage DC side is not affected.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method for suppressing capacitor voltage fluctuations in a modular solid-state transformer. 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, and the access of distributed power is not considered in the planning and design stage and operation management of the distribution network. With the continuous increase of distributed power access, the rapid popularization of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 张建文周剑桥施刚蔡旭
Owner SHANGHAI JIAO TONG UNIV
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