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Method of controlling uninterruptible power supply to clear short-circuit load

A controller, three-level technology, applied in the direction of battery disconnection circuit, circuit device, emergency power arrangement, etc., can solve problems such as not being cost-effective

Active Publication Date: 2021-03-12
威尔蒂夫有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Other solutions are to use an oversized inverter in the UPS system or use fast blow fuses instead of slow blow fuses to protect the load, neither of which is often cost effective

Method used

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  • Method of controlling uninterruptible power supply to clear short-circuit load
  • Method of controlling uninterruptible power supply to clear short-circuit load
  • Method of controlling uninterruptible power supply to clear short-circuit load

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Embodiment Construction

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings.

[0027] Inverters used in UPS systems are generally classified as two-level inverters and three-level inverters. figure 2A typical prior art three-phase two-level inverter 200 is shown. The three-phase two-level inverter 200 has three inverter pins 202a, 202b and 202c, one pin corresponding to one of the three phases. The three inverter pins have the same topology, and only the topology of inverter pin 202a is depicted. The inverter pin 202 a includes two IGBTs 204 , 206 coupled in series across a DC bus 207 of a UPS system, such as the UPS system 100 . The connection point 208 between the IGBTs 204, 206 is the output of the inverter pin 202a. It should be understood that the inverter can use power switching semiconductors other than IGBTs, such as SCRs, thyristors, MOSFETs, and the like.

[0028] image 3 A typical prior art three-phase three-level T-type inverter 3...

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Abstract

The uninterruptible power supply system has a three-level T-type inverter. A method of improving short circuit clearance of a load coupled to an output of an inverter when a short circuit event occurs to a load includes utilizing a controller to switch between two phases when the output voltage and output current of each phase of the inverter have the same direction. The phases are commutated under level mode current generation, and are commutated under three level mode current generation when the output voltage and output current of each phase of the inverter have opposite directions.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Invention Application Serial No. 14 / 605,263, filed January 26, 2015. The entire disclosures of the aforementioned applications are hereby incorporated by reference into this disclosure. technical field [0003] The present disclosure relates to large uninterruptible power supply ("UPS") systems, such as those used to power data centers, and more particularly, to short circuit management control in such UPS systems. Background technique [0004] This section provides background information related to the present disclosure which is not necessarily prior art. [0005] In a typical data center, the UPS systems used to provide power to the data center need to manage short circuit conditions that may occur due to power distribution or load failures. These UPS systems typically have a capacity of 40kVA or higher. The short circuit current can be many times higher than the rated load ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H02J9/06H02M1/32H02M7/483
CPCH02J7/0031H02J7/007H02J9/061H02J9/062H02M1/32H02M7/483
Inventor 乌戈·钦蒂圭里诺·瓦萨洛马泰奥·洛托尔托詹尼·迪彼得兰杰洛马可·博挪拉埃德温·夏尔斯
Owner 威尔蒂夫有限公司