336 VDC direct current uninterruptible power system and power supply method

Abstract

The invention provides a 336 VDC direct current uninterruptible power system and a power supply method. A 24-pulse main transformer rectifier is used for converting a mains supply alternating current power supply into a 336 VDC direct current power supply as a system main power supply. A high-frequency switch precision charger of the system is used for charging and maintaining a system backup battery pack to be used as a system emergency backup power supply. A high-speed direct current static switch module determines the high-speed switching of being powered by a mains supply main circuit through electrical loads or being powered by the emergency backup power supply according to the quality condition of a mains supply. The 336 VDC direct current uninterruptible power system is made to supply an uninterruptible power supply for IT communication equipment, exchange equipment, a computer instrument control device, an illuminating device and the like of original three-phase alternating currents. The backup battery pack is in a charging and maintaining state at ordinary times, and is only started to be used during system emergency power supplying, therefore, the service life of a storage battery is prolonged, and the reliability and the fault tolerance of the system are improved. The 24-pulse main transformer rectifier can greatly decrease harmonic currents injected to a grid side by the system, and the requirement for relevant standards in China is satisfied.

Description

technical field [0001] The invention relates to the technical field of power supplies, in particular to a 336VDC uninterruptible power supply system and a power supply method. Background technique [0002] Due to the unique shortcomings of UPS itself, it is determined that the safe power supply of the telecommunication system and the guarantee requirements of important automatic instruments and meters, DCS, and SIS cannot be fully guaranteed. Its relatively frequent self-failures bring accidents to the system operation in an endless stream, which brings great harm to the enterprise society. There have been many negative impacts and economic losses. [0003] Among the current existing technical solutions, a typical 336V DC power supply system such as figure 1 As shown, it includes n parallel high-voltage DC switching power supplies 101, which convert the input AC power into high-voltage DC power; the high-voltage DC power distribution panel 102 integrates and distributes hig...

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Problems solved by technology

[0005] 1. The high-voltage DC switching power supply 101 needs to use complex control and management functions in order to ensure the floating charging voltage of multiple batteries 103, which not only increases the burden on the system, but also greatly reduces the fault tolerance of the system

[0006] 2. When the mains power is normal, the high-voltage DC switching power supply 101 not only needs to undertake the task of supplying power to IT equipment loads, but also charges and maintains the battery 103 at the same time, which greatly reduces the service life of the battery and reduces the reliability of the system

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