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MMC-based multi-port hybrid power electronic transformer and control method thereof

A technology of power electronics and control methods, which is applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., and can solve the problem of high equipment cost

Pending Publication Date: 2017-05-10
ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with traditional power transformers, the current equipment cost of power electronic transformers is relatively high

Method used

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  • MMC-based multi-port hybrid power electronic transformer and control method thereof
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  • MMC-based multi-port hybrid power electronic transformer and control method thereof

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] The MMC-based multi-port hybrid power electronic transformer of the present invention is composed of a traditional power transformer and a hybrid MMC, wherein the modules in the hybrid MMC are composed of half-bridge sub-modules and full-bridge sub-modules.

[0040] Such as Figure 1-5 As shown, a multi-port hybrid power electronic transformer based on MMC includes multi-winding transformer, hybrid MMC converter, LC filter and DC output port. The multi-winding transformer includes primary winding, secondary winding a and secondary winding b; the primary winding is connected to the power grid, the winding in each phase of the secondary winding a is directly connected to the load, the secondary winding b is connected to the hybrid MMC converter, and connected to the winding a after passing through the LC filter.

[0041] Such as figure 1 As shown, the ...

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Abstract

The invention provides an MMC-based multi-port hybrid power electronic transformer and a control method thereof. The power electronic transformer comprises a multi-winding transformer, a hybrid MMC converter, an LC filter, a direct-current output port and the like; the multi-winding transformer is a three-phase transformer, and comprises a primary winding and secondary windings a and b; the hybrid MMC converter is a back-to-back structure, and comprises a hybrid MMC structured AC / DC converter and a hybrid MMC structured DC / AC converter; the AC / DC converter and the DC / AC converter are connected through a direct-current side; and the direct-current side is leaded out, and can be used as a direct-current input / output port. The hybrid power electronic transformer provided by the invention comprises the traditional power transformer and the power electronic transformer, and integrates the advantages of the two; balance between the equipment effect and the cost is realized; the device comprises the direct-current port, so that access of a new energy, an energy storage unit and the like is convenient; furthermore, the device can realize reactive power compensation and dynamic voltage restorer at the same time; the electric energy quality of a power grid is further improved; individual-phase control is adopted in the control strategy aspect; and thus, the control strategy flexibility is improved.

Description

technical field [0001] The invention relates to an MMC-based multi-port hybrid power electronic transformer and a control method thereof, belonging to the technical field of power electronics applications. Background technique [0002] With the rapid development of the economy and the gradual expansion of the scale of social production, the demand for various forms of power continues to grow, and the requirements for power electronic equipment are also getting higher and higher, and power electronics technology is developing rapidly. With the advantages of high output voltage, low harmonic content, small voltage change rate, small voltage stress of power switching devices, and low switching frequency, it is gradually becoming a research hotspot in the field of high-voltage and high-power power applications. [0003] As the basic equipment of the power system, the traditional power transformer has the characteristics of simple structure and high reliability. However, traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02J3/18H02J3/12
CPCH02J3/12H02J3/1821H02M5/4585H02M1/007Y02E40/30
Inventor 刘君曾华荣陈沛龙肖勇马晓红杨涛曾鹏杨斌王建华季振东赵剑锋
Owner ELECTRIC POWER SCI RES INST OF GUIZHOU POWER GRID CO LTD
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