Electronic power transformer based on multi-media card (MMC)

A technology of electronic power and transformers, which is applied in the direction of adjusting electrical variables, instruments, electrical components, etc., can solve the problems of difficult realization of DC capacitor voltage balance control, and achieve the effect of easy balance control

Active Publication Date: 2013-07-17
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide an electronic power transformer based on MMC that can easily realize DC capacito

Method used

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  • Electronic power transformer based on multi-media card (MMC)
  • Electronic power transformer based on multi-media card (MMC)
  • Electronic power transformer based on multi-media card (MMC)

Examples

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Embodiment Construction

[0022] Such as figure 1 , figure 2 , image 3 with Figure 4 As shown, an electronic power transformer based on MMC is characterized in that it includes a modular multilevel converter 100 and a DC-DC isolator 200, and the AC side of the modular multilevel converter 100 is connected to a high voltage AC power grid, the DC side of the modular multilevel converter 100 is connected to the DC-DC isolator 200, the modular multilevel converter 100 includes a plurality of sub-modules 120 connected in series, the The positive and negative sides of the DC side of the sub-module 120 are respectively connected to the positive and negative sides of the high-voltage DC grid. The DC-DC isolator 200 includes a first capacitor 210 and a second capacitor 220. The DC output side of the DC-DC isolator 200 is connected in parallel The first capacitor 210 forms a DC output port, and the DC output port is connected to a low-voltage DC grid. The DC input side of the DC-DC isolator 200 is connecte...

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PUM

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Abstract

The invention provides an electronic power transformer based on a multi-media card (MMC). The electronic power transformer based on the MMC comprises the MMC and a direct current-direct current (DC-DC) isolator. The MMC comprises a plurality of sub-modules which are connected in series, the direct current output side and the direct current input side of the DC-DC isolator are respectively connected with capacitors in parallel, the direct current output side of the DC-DC isolator is connected with a low voltage direct current power grid, the direct current input side of the DC-DC isolator is connected with the direct current output ends of the sub-modules, and each sub-module comprises a half-bridge circuit and a capacitor, wherein the half-bridge circuits and the capacitors are connected in parallel. When direct current capacitor voltage of the MMC is unbalanced, the sub-modules with high capacitor voltage in the MMC charge the capacitors with low voltage to raise voltage values through the DC-DC isolator with the help of the low voltage direct current power grid and then through the DC-DC isolator again, stability of voltage on the direct current side is guaranteed, and therefore automatic balance of the direct current capacitor voltage of the MMC is achieved.

Description

technical field [0001] The invention relates to the technical field of power equipment, in particular to an MMC-based electronic power transformer. Background technique [0002] With the continuous development of the world economy, the demand for various forms of electricity is growing faster and faster, and the problems of energy shortage and environmental protection are becoming more and more serious. Renewable energy power generation technologies represented by wind power and solar power are gradually becoming the future power generation technology. The development direction and research hotspots of system technology. However, these clean energy sources often have characteristics such as scattered locations and far away from power user centers. The high-voltage direct current transmission system based on voltage source converters can connect these small distributed power systems to the AC grid in an economical and environmentally friendly way. High voltage and high power ...

Claims

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Application Information

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IPC IPC(8): H02M5/458H02M7/537H02M3/335
Inventor 张俊峰易杨陈迅毛承雄万川王丹陆继明
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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