Control method for promoting light load of UPS (Uninterrupted Power Supply)

Abstract

The invention relates to a control method for promoting the light load of a UPS (Uninterrupted Power Supply). The UPS at least comprises four power units such as a rectification unit 1, a rectification unit 2, an inverter unit 1 and an inverter unit 2 which are connected in parallel; the UPS is used for judging an existing operation state, if the operation state of the system does not meet a condition 1, i.e. the capacity is less than a threshold value a and the lasting time exceeds t1, the system keeps the parallel operation state of the power units; if the operation state of the system is judged to meet the condition 1, turn off any one or two power units in the system according to specific index demands; under the state that part of power units in the system are turned off, if the existing operation state of the system meets a condition 2, i.e. the capacity is greater than a threshold 2, restoring to the primary parallel operation state of the power units; if the existing operation state does not meet the condition 2, keeping the state that part of power units in the system are turned off. According to the control method provided by the invention, the performance index can be improved under the light load operation of the UPS, and the service efficiency can be improved.

Description

Technical field [0001] The invention relates to the technical field of UPS performance control, in particular to a control method for improving the light-load performance of the UPS. Background technique [0002] UPS is a kind of power protection equipment containing battery energy storage device and inverter as the main unit. When the mains input is normal, the UPS will convert the mains power to a stable AC voltage for the load through the rectification and inverter circuit, and at the same time complete the charging of the battery; when the mains is abnormal, the UPS will use the energy stored in the battery It is converted into constant voltage and constant frequency AC power through DC boost and inverter circuit to supply power to the load. When the UPS has abnormal phenomena such as overload and over temperature, the UPS will switch the load from the inverter side to the bypass side to ensure that the load side does not lose power. [0003] In actual application design, in ...

AI Technical Summary

Problems solved by technology

Since in actual use, UPS often works under light load conditions, so the performance indicators of UPS under light load conditions (such as total harmonic distortion of input current, conversion efficiency of the whole machine, etc.) have attracted more and more attention. When designing UPS, more attention is paid to the full-load performance parameters, so the general UPS light-load indicators are difficult to meet the requirements

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