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Uninterrupt power supply system with parallel operation function

A technology of power supply system and operation function, which is applied in the field of uninterruptible power supply system, and can solve the problems of unsuitable parallel connection of uninterruptible power supply units with different capacities

Active Publication Date: 2009-07-29
ABLEREX ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the control method of the UPS system with parallel operation function is only suitable for parallel connection

Method used

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  • Uninterrupt power supply system with parallel operation function
  • Uninterrupt power supply system with parallel operation function
  • Uninterrupt power supply system with parallel operation function

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Embodiment Construction

[0038] In order to fully understand the present invention, preferred embodiments are exemplified below and described in detail with accompanying drawings, which are not intended to limit the present invention.

[0039] figure 1 A structural schematic diagram of an uninterruptible power supply system with a parallel operation function that discloses a preferred embodiment of the present invention; figure 2 A schematic diagram showing the structure of a single uninterruptible power supply unit of an uninterruptible power supply system with a parallel operation function according to a preferred embodiment of the present invention; and FIG. block diagram.

[0040] Please refer to figure 1 As shown, the uninterruptible power supply system with parallel operation function according to the preferred embodiment of the present invention includes N uninterruptible power supply units for parallel operation. Each uninterruptible power supply unit includes an input terminal and an output...

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Abstract

An uninterruptible power system with the function of parallel operation comprises one or a plurality of uninterruptible power supply units, each of which has different capacity. The uninterruptible power supply unit comprises a direct current/alternating current converter and a control circuit controlling the converter. The control circuit comprises a voltage feedback control circuit and a current feedforward control circuit. The voltage feedback control circuit comprises a voltage stabilizing control circuit for controlling the load voltage amplitude and a waveform control circuit for controlling the load voltage waveform. The current feedforward control circuit detects the output current of the direct current/alternating current converter and separates out the fundamental wave and harmonic wave constituents of the output current, operating the fundamental wave and harmonic wave constituents into a virtual fundamental wave resistance and a virtual harmonic wave resistance to be in series connected at the output ends of the direct current/alternating current converter equivalently. The outputs of the voltage feedback control circuit and the current feedforward control circuit are added to form a modulation signal that is output to a pulse-width modulation circuit so as to obtain a driving signal of the direct current/alternating current converter.

Description

technical field [0001] The present invention relates to an uninterruptible power supply system with parallel operation function, in particular to an uninterruptible power supply system with parallel operation of uninterruptible power supply units with different capacities, which controls each of the uninterruptible power supply units according to the capacity ratio of the uninterruptible power supply units The uninterruptible power supply unit is used to distribute the output current of each uninterruptible power supply unit according to its capacity ratio. Background technique [0002] With the development of science and technology and the continuous increase of electrical equipment, so that the load capacity continues to increase, the demand for large-capacity uninterruptible power supply systems is also increasing. In order to increase the capacity of the UPS system, there are generally two existing expansion methods: one is to only increase the capacity of a single UPS u...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J7/34H02J1/10
Inventor 吴晋昌周宏亮林裕修侯文杰魏汉昇
Owner ABLEREX ELECTRONICS CO LTD
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