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A DC fault ride-through method for power electronic transformers

A technology of DC fault ride-through and power electronics, applied in the direction of power transmission AC network, electrical components, emergency protection circuit devices, etc., can solve immature problems, achieve the effects of improving stability, reducing power supply reliability, and being easy to implement

Active Publication Date: 2021-04-06
XIAN XJ POWER ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the low-voltage ride-through theory of interconnected devices, especially the low-voltage ride-through theory and technology on the DC side, is still immature, so related technologies have become key points and difficulties

Method used

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  • A DC fault ride-through method for power electronic transformers
  • A DC fault ride-through method for power electronic transformers
  • A DC fault ride-through method for power electronic transformers

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] see figure 1 , the present invention adopts MMC+ISOP topology in the power electronic transformer main loop topology structure, each bridge arm of MMC topology is composed of a plurality of sub-modules connected in series, and the sub-module (SM) adopts a half-bridge structure; each group of power units of ISOP topology adopts Bidirectional LLC topology, each power unit includes a high-voltage side H-bridge module, a high-frequency isolation transformer, and a low-voltage side H-bridge module, where the high-voltage side modules are connected in series, and the low-voltage side modules are connected in parallel.

[0039] see figure 2 , T1 in the figure is taken as 0.5 seconds, and T2 is taken as 5.5 seconds. By coordinating the control functions of the MMC device and the DCDC device, the present invention realizes the fault ride-through function of t...

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Abstract

A DC fault ride-through method for power electronic transformers. The power electronic transformers used in AC-DC hybrid microgrids have two working modes: one is the voltage stabilization mode, which stabilizes the voltage on the low-voltage side; Deliver power. For these two working modes, in the present invention, when the power electronic transformer detects a DC fault in the microgrid, the DCDC device quickly blocks the pulse and calculates the short-circuit current that needs to be provided according to the voltage drop value, and the MMC device stabilizes the bus voltage of the intermediate stage. After the calculation, it needs to provide After the short-circuit current, the DCDC device pulse is unlocked, and the short-circuit support current is output until the bus voltage returns to normal, and the MMC device is switched to the operation mode before the fault to complete the DC fault ride-through. The invention can effectively improve the power supply quality of the micro-grid system and improve the stability of the micro-grid system.

Description

technical field [0001] The invention belongs to the field of AC-DC hybrid micro-grid systems, and in particular relates to a DC fault ride-through method for power electronic transformers, aimed at improving the stability of the micro-grid system for power electronic transformers applied to AC-DC hybrid micro-grids. Background technique [0002] With the development of new energy, new power and new technologies, the advantages of DC power supply technology in certain fields are becoming more and more obvious. The traditional power grid needs to adapt to the access of a large number of distributed energy resources (DER) and energy storage systems (ES) with high penetration rates, and needs to effectively isolate the adverse impact of new energy on the AC power grid. Direct drive wind turbines, fuel cells, solar photovoltaics and other renewable energy generation methods must be incorporated into the AC distribution network through DC / AC inverter technology, and the extensive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J5/00H02H7/12
CPCH02H7/1213H02J3/36H02J5/00Y02E60/60
Inventor 郜亚秋王林安昱辛德锋曹建博陈雪梁燕张海龙
Owner XIAN XJ POWER ELECTRONICS TECH
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