Control Method for Suppressing Capacitor Voltage Fluctuation in Modular Solid State Transformer

A solid-state transformer and capacitor voltage technology, which is applied to electrical components, output power conversion devices, and AC power input to DC power output. It can solve the problems of large capacitors, fluctuations, large capacitors and low-frequency voltages, and reduce the cost of capacitors. and volume, suppress low-frequency fluctuations, and realize the effect of compactness

Active Publication Date: 2020-10-30
SHANGHAI JIAOTONG UNIV
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  • Application Information

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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 pointed out that for those of ordinary skill in the art, several changes 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.

[0040] figure 1 It is a schematic diagram of the topological structure of a modular solid-state transformer; figure 1 As shown, the whole topology adopts the sub-module unit (SM) of the multi-level converter (Modular Multilevel Converter, MMC) and the dual active bridge unit (Dual Active Bridge, DAB) to interconnect to realize the low voltage distribution Power transmission between the power grids, and provide four types of ports: medium voltage DC, medium voltage AC, low voltage D...

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Abstract

The present invention provides a control method for suppressing capacitor voltage fluctuations in a modular solid-state transformer, comprising: transferring the fluctuations in the input current of the half-bridge unit to the low-voltage DC port and the medium-voltage DC port: By modulating the phase shift angle of the dual active bridge unit, the fluctuating power of the low-voltage DC port and the medium-voltage DC port is controlled to maintain self-balancing. Therefore, the capacitor voltage fluctuation of the half-bridge unit in the multi-level converter is transmitted to the low-voltage DC side through the dual active bridge of the subsequent stage, thereby suppressing the low-frequency fluctuation in the capacitor voltage of the half-bridge unit in the multi-level converter, Reduce the cost and volume of capacitors, and realize the compactness of the device; in addition, the fluctuating power transmitted by each half-bridge unit to the low-voltage DC side will achieve self-balancing, and will not affect the normal operation of the low-voltage DC side.

Description

Technical field [0001] The present invention relates to the technical field of power electronics, and in particular, to a control method for suppressing fluctuations in capacitor voltage in a modular solid-state transformer. Background technique [0002] Renewable energy is often connected to the distribution network in the form of distributed power sources and converted into electric energy to supply end users. However, the operation mode of the traditional distribution network is basically based on supplier-led and unidirectional radial power supply. Its primary power distribution control equipment (on-load voltage regulator, contact switch, etc.) lacks regulation and control capabilities, and it is difficult to meet renewable energy. And the high-precision real-time operation optimization requirements of the distribution network when the load fluctuates frequently, and in the planning and design phase of the distribution network and operation management, the access of distribu...

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Application Information

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