Hydrogen production converter topological structure suitable for accessing single-phase alternating current system and control method

Abstract

The invention discloses a hydrogen production converter topological structure suitable for accessing a single-phase alternating current system and a control method, and the structure comprises an alternating current power supply which is a single-phase alternating current voltage source, is connected in series with an alternating current reactor and then is connected in parallel with a preceding-stage rectification module, and the low-voltage end after parallel connection is connected with a grounding point; the preceding-stage rectification module is provided with a plurality of groups of direct current output ends, and all the direct current output ends of the preceding-stage rectification module are connected with the direct current input end of the second-stage conversion module; the second-stage conversion module is provided with a plurality of groups of direct current input ends and direct current output ends, all the direct current input ends are connected with the direct current output ends corresponding to the preceding-stage rectification module, all the direct current output ends of the second-stage conversion module are connected in parallel, and the positive electrode and the negative electrode of the direct current output end after parallel connection are connected with the positive electrode and the negative electrode of the electrolytic cell respectively; and the topological structure also comprises a control system module which calculates and outputs a control signal. According to the invention, the current output capability is further improved, the conversion from high-voltage alternating current to low-voltage direct current is realized, and a higher voltage transformation ratio is easy to realize.

Description

technical field [0001] The invention relates to the field of hydrogen production by electrolysis of water, in particular to a topology and control method of a hydrogen production converter suitable for connecting to a single-phase AC system. Background technique [0002] New energy technology has developed rapidly in recent years, and its proportion in the backbone network and distribution network has continued to increase. The consumption and storage of new energy has become one of the bottlenecks in the development of large-scale new energy, such as large-scale wind farm abandonment and other phenomena It is becoming more and more serious and urgently needs to be resolved. Hydrogen production by electrolysis of water provides a new solution for energy consumption. The electrolyzed water can be fresh water or treated seawater, its raw material cost is low, hydrogen can be compressed and stored, used in industrial production and manufacturing of fuel cells, etc. The conver...

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Problems solved by technology

For example, the control method described in the document "Guangdong Electric Power, 2019, vol.32, No.5 Modeling and Control of Controllable Direct Drive Permanent Magnet Wind Turbine Based on Wind Power Hydrogen Production and Supercapacitor Hybrid Energy Storage" can realize DC / DC conversion It is based on the PI regulator to design the output current controller of the hydrogen production converter. However, this method cannot be directly connected to the AC power supply. It is necessary to design a one-way AC / DC converter to supply power for the hydrogen production device and provide suitable electrolyzers. Voltage level

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