Power supply system using distributed low-power power supply modules

Abstract

The invention provides a power supply system provided with a distributed low-power power supply module. The system comprises a high-voltage power box which outputs a first DC power supply; the train wiring is connected with the high-voltage power box and provides a first direct-current power supply; wherein the air conditioner direct-current power supplies are formed by connecting a first number of small-power power supply modules in parallel and are configured to the corresponding direct-current variable-frequency air conditioning units in a distributed mode, and the small-power power supplymodules are used for converting the first direct-current power supply into a second direct-current power supply so as to drive the direct-current variable-frequency air conditioning units; and the auxiliary inverter is composed of a charger and a second number of low-power power supply modules connected in parallel, the auxiliary inverter is connected with the high-voltage power supply box, the low-power power supply modules are used for converting the first direct-current power supply into a second direct-current power supply, and the charger is used for outputting a third direct-current power supply. The system is relatively high in overall efficiency, relatively low in cost, relatively small in weight and size, low in wiring difficulty and high in stability.

Description

technical field [0001] The invention relates to a power supply system adopting a distributed low-power power supply module, belonging to the field of power supply, in particular to a power supply system adopting a distributed low-power power supply module for a high-voltage direct air conditioner. Background technique [0002] Since power frequency parallel auxiliary inverters and 380 AC inverter air conditioners were popularized on trains, the application of new technology in auxiliary inverters and air conditioners has entered a relatively stable period, but the cost and weight of power frequency parallel auxiliary inverters are still relatively high (for example The auxiliary inverter, air conditioner and control panel of a carriage total about 7.8T), the efficiency of the AC inverter air conditioner is low (about 88%), and the cost is relatively high (the auxiliary inverter, charger and air conditioner total 2.35 million). [0003] Specifically, the existing train power ...

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Problems solved by technology

[0005] However, this method of multi-bus power supply increases the difficulty and cost of wiring, and the DC auxiliary converter used between the high-voltage and medium-voltage DC buses centrally supplies power to medium-voltage loads, which bears a large current and has a complex structure , the cost is very high, the impact area is large when it fails, and the stability is low; furthermore, in order to provide redundant power supply, in the case where multiple sets of DC auxiliary converters are usually required, the cost is greatly increased, so it is difficult to popularize and apply

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