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Fault-tolerant control method for UPS load current acquisition failure and device employing method

A technology of load current and fault-tolerant control, which is applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as inability to perform overload protection, and achieve the effect of bypass overload protection

Active Publication Date: 2018-04-20
ZHANGZHOU KEHUA TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a fault-tolerant control method for failure of UPS load current acquisition and a device using the method, which is used to solve the problem that the UPS in the prior art cannot perform effective overload protection once the load current sampling fails in the load protection control

Method used

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  • Fault-tolerant control method for UPS load current acquisition failure and device employing method
  • Fault-tolerant control method for UPS load current acquisition failure and device employing method
  • Fault-tolerant control method for UPS load current acquisition failure and device employing method

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Embodiment Construction

[0030] Examples, see figure 1 , figure 2 As shown, a kind of fault-tolerant control method of UPS load current acquisition failure of the present invention is as follows: real-time acquisition of UPS inverter output voltage Uinv, bypass output voltage Uby, inverter output current Iinv, load output current Iout, and judging load output current Whether Iout is greater than the first set value Im1, if so, use the load output current Iout to participate in the calculation of load power for load monitoring and overload protection, otherwise judge whether the inverter output current Iinv is greater than the second set value Im2; if the inverter output current If Iinv is greater than the second set value Im2, the load output current Is will be reconstructed, and the load output current Is will be used to calculate the load power for load monitoring and overload protection; otherwise, the load output current Iout will be used to calculate the load power for load monitoring and Overl...

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Abstract

The invention discloses a fault-tolerant control method for a UPS load current acquisition failure and a device employing the method. The method comprises the steps of acquiring an inversion output voltage U<inv>, a bypass output voltage U<by>, an inversion output current I<inv> and a load output current I<out> of an uninterruptible power supply (UPS), judging whether the load output current I<out> is larger than a first set value or not, if yes, allowing the load output current I<out> to participate in calculation of a load power, performing load monitoring and overload protection, otherwisejudging whether inversion output current I<inv> is larger than a second set value or not; and reconstructing a load output current I<s> if the inversion output current I<inv> is larger than the secondset value, allowing the load output current I<s> to participate in calculation of the load power, performing load monitoring and overload protection, otherwise allowing the load output current I<out>to participate in calculation of the load power, and performing load monitoring and overload protection, wherein load output current I<s>=Eta*I<inv>*M, Eta is efficiency of a UPS transformer, and M is a transformation ratio of the UPS transformer. By the method, the load current can be reconstructed when load current acquisition is failure, and the function of inversion overload protection is achieved.

Description

technical field [0001] The invention relates to the field of UPS load protection control, in particular to a fault-tolerant control method for UPS load current acquisition failure and a device applying the method. Background technique [0002] UPS has overload capacity limit. After reaching the overload, overload protection will be carried out according to the overload percentage and overload time. For example, the default load is 100% full power output, and the load can be fully loaded within the range of 100%--120% for 30 minutes. The overload time is 30 minutes. It is necessary to switch to the bypass output, inverter protection; the overload capacity of the bypass state is similar. Overload protection is a necessary performance in the UPS system, because the UPS has a power limit, and overload protection is required to reach a certain power point. If there is no overload protection, the power devices inside the UPS are easily damaged if the overload continues. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122H02J9/06
CPCH02H7/1227H02J9/062
Inventor 崔福军陈坤裕陈林成林高达
Owner ZHANGZHOU KEHUA TECH CO LTD
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