Water electrolysis hydrogen production control method and system and controller

Abstract

The invention provides a water electrolysis hydrogen production control method and system and a controller. According to the scheme, the method comprises the steps: controlling the working state of an electrolytic cell according to the concentration of hydrogen generated by the electrolytic cell, and controlling the on-off state of at least one power switch when the concentration of hydrogen exceeds a target concentration range so as to adjust the number of electrolysis cells participating in hydrogen production in the electrolytic cell; equivalently, the power required by the electrolytic cell is adjusted so that the hydrogen concentration generated by the electrolytic cell is changed, and finally, the hydrogen production concentration of the electrolytic cell is stabilized within a target concentration range. According to the scheme, the working state of the electrolytic cell is dynamically adjusted according to the hydrogen production concentration of the electrolytic cell, electric energy generated by a renewable energy power generation system in a weak power generation area is fully utilized, and hydrogen yield and hydrogen purity are improved.

Description

technical field [0001] The invention belongs to the technical field of water electrolysis, and in particular relates to a control method, system and controller for hydrogen production by water electrolysis. Background technique [0002] In recent years, with the rapid development of solar energy, wind energy and other renewable energy power generation technologies and the rapid decline in the cost of electricity, the use of renewable energy power for water electrolysis hydrogen production has been widely used. [0003] However, when the input power of the water electrolysis hydrogen production tank is lower than the preset threshold, the purity of the hydrogen produced will decrease. Because the oxygen concentration in the hydrogen is too high, after entering the purification system, the purification system will not work properly due to the high calorific value. It can be seen that , the water electrolysis hydrogen production tank cannot work when the power is lower than the...

AI Technical Summary

Problems solved by technology

[0003] However, when the input power of the water electrolysis hydrogen production tank is lower than the preset threshold, the purity of the hydrogen produced will decrease. Because the oxygen concentration in the hydrogen is too high, after entering the purification system, the purification system will not work properly due to the high calorific value. It can be seen that , the water electrolysis hydrogen production tank cannot work when the power is lower than the preset threshold, and this is not compatible with the low power renewable energy generated in some scenarios, for example, the power generation of photovoltaics is low in the morning and evening or on rainy days , or, the wind power generation is low in weak wind weather, which will lead to low power utilization in weak power generation areas

Images