Uninterruptible power supply system

A power system and circuit technology, applied in emergency power supply arrangements, electrical components, circuit devices, etc., can solve problems such as large power loss, inability to meet high-quality power supply in data centers, and poor power grid power quality.

Inactive Publication Date: 2018-04-27
EAST GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantage of this kind of online UPS is that the power loss in the strong grid power supply environment is large, and the operating cost is high. Moreover, the traditional UPS cannot effectively improve the power quality of the grid when the power quality is poor, so it cannot meet the requirements of high-quality data centers. power supply needs

Method used

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] figure 1 It is a circuit block diagram of an uninterruptible power supply system in an embodiment. The uninterruptible power supply system includes an energy storage device 110 , a converter 120 , a grid-connected control circuit 130 , an off-grid control circuit 140 , a mode switch 150 , a drive signal generator 160 and a control circuit.

[0025] The energy storage device 110 is used for storing electric energy, so that the electric energy can be output to the load for normal operation. The energy storage device 110 may be implemented by using a type of battery commonly used in uninterru...

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Abstract

The invention discloses an uninterruptible power supply system, which comprises an energy storage device, a converter, a grid-connected control circuit, an off-grid control circuit, a mode switching switch and a control circuit, wherein the off-grid control circuit comprises an outer voltage loop circuit, an inner current loop circuit and a load side current harmonic suppression circuit; and the load side current harmonic suppression circuit comprises a three-phase resonant filter and is used for extracting preset subharmonics in three-phase load current and generating a load current harmoniccompensation instruction signal. According to the uninterruptible power supply system, reactive power and harmonic compensation can be carried out on output in the grid connection process, so that thepower loss is reduced. The off-grid control circuit does not participate in control in a grid-connected mode, but generates an off-grid control signal, so that seamless switching of the grid-connected / off-grid mode is achieved when the system is switched into the off-grid mode from the grid-connected mode. When the uninterruptible power supply system is in the off-grid mode, the converter carriesout harmonic compensation on load current and the harmonic content in the load current is minimized, so that high power-quality power supply for load is achieved.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to an uninterruptible power supply system. Background technique [0002] With the rapid growth of power loads in data centers in recent years, the requirements for energy efficiency indicators are getting higher and higher. For the uninterruptible power system (UPS) used in high-density data centers, it is not only necessary to supply power to IT equipment, but also to ensure the power supply of auxiliary equipment such as air conditioners for the operation of IT equipment, and the demand for power will continue to increase. Since the high density of data centers is an inevitable trend, new requirements are put forward for the UPS that provides power guarantee for it. In the traditional data center power supply mode, an online UPS power supply based on double conversion technology is generally used. The main disadvantage of this kind of online UPS is that the power loss in th...

Claims

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Application Information

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IPC IPC(8): H02J9/06H02J3/38H02J3/01H02J3/18
CPCH02J3/01H02J3/1821H02J3/38H02J9/061Y02E40/30Y02E40/40
Inventor 张涛于玮徐海波
Owner EAST GRP CO LTD
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