Power supply system and power supply control method

Abstract

The invention provides a power supply system and a power supply control method. The power supply system comprises a hydrogen gas preparation device, a hydrogen-oxygen fuel battery and a power control device, wherein the hydrogen gas preparation device prepares hydrogen gas from liquid methanol; the hydrogen-oxygen fuel battery is connected with the hydrogen gas preparation device and is used for receiving the hydrogen gas and generating first power; and the power control device is connected with the hydrogen-oxygen fuel battery, and is used for converting the first power into second power before supplying onto a power line and simultaneously controlling the power generation operation of the hydrogen-oxygen fuel battery according to the voltage on the power line. The power supply system provided by the invention is low in cost and can prepare hydrogen gas at a high efficiency, so that the fuel battery can continuously provide supplementary power voltage required on the power line.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a power supply system and a control method for power supply. Background technique [0002] 1. Hydrogen is used frequently in industry. In the prior art, there are multiple methods for the industrial preparation of hydrogen: [0003] ①The electrolysis method electrolyzes water to obtain hydrogen and oxygen. The chlor-alkali industry electrolyzes salt solution to produce chlorine gas and caustic soda, and also produces hydrogen as a by-product. The electrolysis method can obtain pure hydrogen, but the power consumption is very high, and every 1m of hydrogen produced 3 , power consumption of 21.6 ~ 25.2MJ. [0004] ② Hydrocarbon cracking method The cracked gas obtained by this method contains a large amount of hydrogen, and the hydrogen content varies depending on the nature of the raw material and the cracking conditions. Hydrogen with a purity of 90% can be obtained by cryogenic...

AI Technical Summary

Problems solved by technology

This type of battery has the advantages of high conversion efficiency, large capacity, high specific energy, wide power range, and no charging, but due to high cost and complicated system, it is limited to some special purposes, such as spaceships, submarines, military, TV transfer stations, Lighthouses and buoys etc.

Usually this type of battery generates electric current through the discharge reaction of the stack. When the battery is turned off, that is, when the stack is turned off, because hydrogen and liquid water still remain inside, in order to avoid its continued reaction to generate electric energy, in the prior art Usually, nitrogen gas is injected into the stack to discharge hydrogen and liquid water, but this method has large limitations and is difficult to implement

In addition, hydrogen-oxygen fuel cells in the prior art do not have a relatively strict monitoring process for the introduction of hydrogen and oxygen (air), which leads to poor performance of the discharge reaction in the stack.

[0009] 3. At present, due to changes in the load on the power line or changes in power consumption, the voltage on the power line usually changes. In order to provide stable voltage on the power line, the current method is to provide power modules such as storage batteries. Supplementary power voltage, but due to the frequent charging and discharging of the storage battery, it is easily damaged and the service life will be affected

Therefore, regular replacement is usually required, which not only brings a burden on cost, but also has the characteristics of complicated operation.

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