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Online uninterruptible power supply and power quality management method using same

A power quality and power technology, applied in the field of uninterruptible power supply, can solve problems such as low cost performance and complex system

Inactive Publication Date: 2016-02-03
GUANGDONG POLYTECHNIC NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because Delta UPS needs two sets of inverters and transformers, there are still problems such as complex system and low cost performance.

Method used

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  • Online uninterruptible power supply and power quality management method using same
  • Online uninterruptible power supply and power quality management method using same
  • Online uninterruptible power supply and power quality management method using same

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Embodiment Construction

[0041] The specific embodiment of the present invention is described below in conjunction with accompanying drawing:

[0042] The invention provides an on-line uninterruptible power supply with comprehensive power quality management function. The three-phase balanced output of UPS output voltage is realized by a first-stage conversion device, and the three-phase balanced input of active power on the grid side is realized. The harmonic current of the grid is small and the output The voltage harmonics are small, and it has reactive power compensation capability, which saves costs and improves the efficiency of UPS under rated working conditions. It has strong load capacity and good dynamic response characteristics.

[0043] Such as figure 1 As shown, the online uninterruptible power supply includes a three-level inverter 1, two sets of batteries 2, and a control circuit. The two sets of batteries 2 are connected in series to the DC input end of the three-level inverter 1, and th...

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Abstract

The invention discloses an online uninterruptible power supply and a power quality management method using the same, belongs to the technical field of the uninterruptible power supply, and aims to provide the online uninterruptible power supply with the comprehensive power quality management function for realizing high efficiency and high cost performance. The power supply comprises a three-level inverter, two groups of storage batteries and a control circuit; the two group of storage batteries are serially connected to the direct current input end of the three-level inverter; the middle point of the two group of storage batteries is connected to the central point of a three-phase mains supply power grid; and the three-phase mains supply is connected with the output end of the three-level inverter through a first switch and a mains supply end inductor. The power quality management method is carried out by the steps that the output end of the three-level inverter of the power supply is connected with the load output end through a third switch; the three-phase mains supply is connected with the load output end through a second switch; and the power supply and the three-phase mains supply are in parallel operation for jointly supplying power to the load. The power quality management method using the online uninterruptible power supply is suitable for the comprehensive power quality management apparatus by using the uninterruptible power supply.

Description

technical field [0001] The invention specifically relates to an online uninterruptible power supply and a power quality control method using the power supply, belonging to the technical field of uninterruptible power supplies. Background technique [0002] UPS (Uninterruptible Power System / Uninterruptible Power Supply), that is, uninterruptible power supply, is a system device that connects the battery to the host, and converts DC power into commercial power through a module circuit such as the host inverter. It is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment such as solenoid valves and pressure transmitters. When the mains input is normal, the UPS will stabilize the mains and supply it to the load. At this time, the UPS is an AC mains voltage stabilizer, and it also charges the battery inside the machine; when the mains is interrupted, the UPS immediately The DC power of the b...

Claims

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Application Information

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IPC IPC(8): H02J7/00H02J3/26H02J3/01H02J3/18
CPCY02E40/30Y02E40/40Y02E40/50
Inventor 张先勇张绪红肖蕾祁伟
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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