Modular multilevel converter (MMC) based solid-state transformer and control method thereof

A technology of solid-state transformer and control method, applied in the direction of irreversible AC power input conversion to DC power output, output power conversion device, AC power input conversion to AC power output, etc. Problems such as power quality interference function, difficulty in modular construction, and many required components can achieve the effect of improving power supply reliability, suppressing the influence of the power grid, and improving reliability

Active Publication Date: 2016-04-13
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

Currently, the commonly used solid-state transformer main circuit topology suitable for high-voltage and high-power occasions is mainly based on the H-bridge cascaded type (such as figure 1 ), solid-state transformers of neutral-point clamped multilevel converters, these topologies have many advantages, but th

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  • Modular multilevel converter (MMC) based solid-state transformer and control method thereof
  • Modular multilevel converter (MMC) based solid-state transformer and control method thereof
  • Modular multilevel converter (MMC) based solid-state transformer and control method thereof

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Embodiment Construction

[0039] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0040] Aiming at the problems that the current solid-state transformer cannot adapt to the high-voltage and high-power power distribution system, and cannot suppress the mutual influence between the input and output terminals when the three-phase AC asymmetry occurs in the power grid and the three-phase load is unbalanced, the present invention proposes an MMC-based transformation The solid-state transformer of the inverter can suppress the influence of the three-phase unbalanced load on the power grid by adjusting the constant voltage of the high-voltage public DC bus of the MMC converter, and the influence of the three-phase asymmetry of the power grid on the AC load, and the MMC converter The topology is highly modular, and the requirements of different power and voltage levels can be met by flexibly adjusting the number of sub-modules connected in series. ...

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Abstract

The invention provides a modular multilevel converter (MMC) based solid-state transformer and a control method thereof. The solid-state transformer comprises a high-voltage AC/DC converter, an isolated DC/DC converter and a low-voltage DC/AC converter, wherein the high-voltage AC/DC converter is connected with the isolated DC/DC converter through a high-voltage DC bus, and the isolated DC/DC converter is connected with the low-voltage DC/AC converter through a low-voltage DC bus parallel module. In the MMC based solid-state transformer, a medium- and low-voltage DC side adopts a DC bus staggered parallel topological structure, so that the unbalanced mutual influence of a high-voltage side system and a low-voltage side system of the solid-state transformer is solved from structure, and the power supply reliability is automatically improved; with the mutually-balanced solid-state transformer based on an MMC structure, the influence of a three-phase unbalance on a power grid and the influence of three-phase unbalance occurring in the power grid on an AC load can be prevented by controlling the constant voltage of a high-voltage common DC bus.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an MMC-based solid-state transformer and a control method. Background technique [0002] Solid-state transformer is also called power electronic transformer or flexible transformer. It is a new type of transformer based on power electronic conversion technology and electromagnetic induction technology. It completely changes the system structure of traditional transformers. On the basis of basic functions such as electrical isolation and energy transfer, it can also realize many additional functions such as bidirectional power flow control and power quality control. It is the key equipment for the construction of the next generation of smart grid. Restricted by the development level of power electronic components, solid-state transformers that meet the requirements of the power grid for high voltage, high power, and high current that meet four-quadrant operat...

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Application Information

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IPC IPC(8): H02M5/458H02M7/23H02J3/26
CPCY02E40/50H02M5/458H02J3/26H02M7/23
Inventor 马春艳段青盛万兴梁英史常凯李玉凌吕志鹏
Owner CHINA ELECTRIC POWER RES INST
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