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Modular multi-level solid-state transformer and its sub-module power balance control method

A modular multi-level, solid-state transformer technology, used in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. Achieve the effect of balancing current stress, improving operating efficiency and simplifying control

Active Publication Date: 2021-04-13
上海中绿新能源科技有限公司
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] At present, there is no description or report of the similar technology of the present invention, and no similar data at home and abroad have been collected yet.

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  • Modular multi-level solid-state transformer and its sub-module power balance control method
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  • Modular multi-level solid-state transformer and its sub-module power balance control method

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Embodiment Construction

[0052] 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.

[0053] An embodiment of the present invention provides a method for power balance control of sub-modules in a modular multi-level solid-state transformer (MMC-SST), wherein the topology of the MMC-SST is as follows figure 1 shown. The modular multi-level solid-state transformer topology adopts MMC's sub-module unit SM and IBDC unit interconnection to realize power transfer between medium and low voltage distribution networks, and provides four types of ports: medium voltage DC, medium voltage AC, ...

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Abstract

The invention provides a modular multilevel solid-state transformer and its sub-module power balance control method, wherein: the architecture of the modular multi-level solid-state transformer is that the MMC sub-module DC terminal is interconnected with the IBDC to realize medium-voltage AC, Multi-port converter structure for medium-voltage DC, low-voltage AC, and low-voltage DC. In this MMC-SST, the present invention cancels the MMC sub-module capacitor voltage balance control loop, and proposes that the MMC sub-modules of the same bridge arm adopt a common duty cycle control, and the subsequent stage IBDC adopts sub-module capacitor voltage balance control and low-voltage DC bus voltage control mode , to realize the module power balance of MMC‑SST. Compared with the existing MMC-SST control strategy, the present invention solves the problem of power imbalance caused by the IBDC in the MMC-SST module due to the deviation of internal component parameters, thereby balancing the current stress between modules and improving the MMC-SST operating efficiency.

Description

technical field [0001] The invention relates to the fields of intelligent distribution network technology, power electronics technology, and control technology in a power system, and in particular relates to a modular multilevel solid-state transformer and a sub-module power balance control 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, and the access of distributed power is not considered in the planning and design stage and operation management of the distribut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H02M7/483H02M7/5387H02J5/00
CPCH02J5/00H02M7/00H02M7/483H02M7/53873H02M7/4835
Inventor 张建文周剑桥施刚王晗蔡旭
Owner 上海中绿新能源科技有限公司
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