Method and system for parallel connection of UPS with different capacitance grade

A technology of capacity and grade, applied in the field of power supply, can solve the problems of poor output voltage steady-state accuracy and low system accuracy, and achieve the effects of improving reliability, high precision, and improving portability and versatility.

Active Publication Date: 2008-04-02
VERTIV CORP
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  • Application Information

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Problems solved by technology

[0006] The present invention provides a method and system for parallel connection of UPS with different capacity levels, which is used to solve the low system accuracy and steady-state accuracy of output voltage caused by constructing UPS droop characteristics to realize parallel connection of UPS with different capacity levels in the prior art Poor and other issues

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  • Method and system for parallel connection of UPS with different capacitance grade
  • Method and system for parallel connection of UPS with different capacitance grade
  • Method and system for parallel connection of UPS with different capacitance grade

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Embodiment Construction

[0041] In order to solve the problem in the prior art that the system accuracy is not high and the output voltage steady-state accuracy is poor due to the construction of UPS droop characteristics to realize the parallel connection of UPS with different capacity levels, the present invention is designed according to the physical capacity of each stand-alone unit Parallel system of UPS with different capacity levels.

[0042] The unit design includes hardware unit and software unit. For the hardware unit, because in the control variables of the power system, except for the voltage signal, the current signal is the same, and the output voltage of each unit in the parallel system is equal, so the difference in the capacity level of each unit is the difference in the output current, and the hardware unit refers to The standard unit of the transformation ratio of the current sensor. The transformation ratio of each current sensor (including inverter inductor current sensor, invert...

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Abstract

The invention discloses a parallel connection method of different capacity level UPS, which is to solve the problems of the poor system precision and the poor stability precision ofoutput voltage caused by structuring the droop characteristics of UPS to realize the parallel connection between different capacity level UPS in the prior art. The method includes the following steps that: the physical output current is per-united according to the physical capacity of each stand-alone; each per-united physical output current is averaged to get the per-united equalized value of the physical output current of each stand-alone; the per-united physical output current value and the physical equalized current value are respectively converted to get the physical output current per-united value and physical equalized current per-united value of each stand-alone; the physical output circuit of each stand-alone is controlled by taking advantage of the error between the physical output current per-united value and physical equalized current per-united value of each stand-alone. The invention discloses a different capacity level UPS parallel system at the same time.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a method and system for parallel connection of UPSs of different capacity levels. Background technique [0002] With the increasing degree of social informatization, the scale of information data is getting larger and larger, and the exchange is becoming more and more frequent. higher requirements. [0003] As the main power supply equipment, UPS (Uninterrupted Power System, uninterrupted power system) has become a research hotspot in the industry for its scalability and high redundancy reliability. UPS parallel technology not only allows small-capacity stand-alone modules to form a system capacity that meets user needs, but also forms a redundant power distribution mode to improve system reliability. Compared with the parallel technology of UPS modules of the same capacity level, the parallel connection technology of UPS modules of different capacity levels can not only...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/34
Inventor 张晓飞叶万富
Owner VERTIV CORP
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