Modular UPS with coupling inductors

Abstract

The invention discloses a modular parallel UPS with coupling inductors. The modular parallel UPS comprises N parallel UPS modules and N coupling inductors. The upper bridge arm at the left bridge armside in the same UPS module is a first power switch tube, and the lower bridge arm is a second power switch tube. The upper bridge arm at the right bridge arm side in the same UPS module is a third power switch tube, and the lower bridge arm is a fourth power switch tube. The first power switch tube, the second power switch tube, the third power switch tube and the fourth power switch tube are semiconductor power switches. The inductor of the same UPS module is a filtering capacitor, and the capacitor of the same UPS module is a filtering capacitor. The upper output end of the same UPS moduleis an output end anode, and the lower output end is an output end cathode. The N coupling inductors are connected in a cyclic symmetric structure. According to the modular UPS, on the condition of nocomplicated circulating current suppression algorithm, circulating current between the parallel UPS modules can be effectively suppressed. Compared with a traditional current equalizing reactor, the modular UPS with the coupling inductors has advantages of high equivalent differential mode current equalizing inductor inductance, low equivalent common-mode current inductor inductance, small inductor size, etc.

Description

technical field [0001] The invention belongs to the field of power electronics and belongs to the category of a parallel UPS circulation suppression method, in particular to a modular parallel UPS with coupled inductors. Background technique [0002] At present, there are more and more equipments that need special power supply, and the performance requirements of the equipment for special power supply are also increasing. Including the quality, efficiency, reliability of power supply provided by special power supplies, and the prevention of power supply pollution. The modularized UPS power supply system composed of multiple UPS modules connected in parallel has become a promising engineering application solution due to its high reliability and wide power range. The modular parallel operation of UPS can be used to flexibly expand the capacity of the UPS power supply system and form a parallel redundant system to improve the reliability of operation. This operation method als...

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Problems solved by technology

[0005] Aiming at the above defects of the prior art, the present invention proposes a modular UPS with a coupled inductor, which reversely couples the currents of two adjacent modular UPS parallel branches through the coupled inductor, thereby suppressing the circulating current of the system and solving the problem of The problem of excessive voltage drop on the inductor and excessive volume and weight of the current-limiting inductor

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