High-power electrolytic hydrogen production rectification power supply and control method

Abstract

The invention discloses a control method of a high-power electrolytic hydrogen production rectification power supply. The control method comprises the following steps of: acquiring a zero crossing point of a-phase power grid voltage ua by using a phase-locked circuit, calculating a power grid period in real time by a DSP control circuit according to the zero crossing point of the a-phase power grid voltage ua, and acquiring a power grid reference phase; respectively sampling an input current value of a three-phase LC filter, a direct current side output current value of a three-phase current source type PWM rectifier and a direct current side output current value of a multi-pulse thyristor rectifier by using a current Hall sensor; and employing the DSP control circuit to carry out control calculation according to the values, adopting a PI controller to control the output current of the multi-pulse thyristor rectifier, and adopting the PI controller and a repetitive controller to control the direct current side output current value of the three-phase current source type PWM rectifier. According to the control method, the output power is large, the hydrogen production efficiency is high, the output current can be flexibly adjusted in a large range, and the system is stable and reliable.

Description

technical field [0001] The invention relates to the technical field of hydrogen production by water electrolysis, in particular to a high-power electrolytic hydrogen production rectifier power supply and a control method. Background technique [0002] Energy is the source of power for the development of human society. With the rapid development of social economy, the demand for energy continues to increase. At the same time, the environmental and energy crisis is deepening day by day, and it is imminent to reduce the use of traditional carbon-containing fossil energy. As a zero-carbon green renewable energy, hydrogen energy has the advantages of high energy density and high conversion efficiency, and can realize zero emission and zero pollution in the whole process from development to utilization. The preparation of hydrogen is an important part of the hydrogen energy industry chain. Existing hydrogen production technologies mainly include hydrogen production from fossil f...

AI Technical Summary

Problems solved by technology

Traditional high-power electrolytic stack rectifier power supplies usually use diodes or thyristor rectifiers (6-pulse or multi-pulse rectifiers), which have large ripple components in the DC output voltage or current, resulting in reduced hydrogen production efficiency

Although the direct use of pulse width modulation (PWM) type rectifiers has the characteristics of wide adjustment range, small output ripple, high power factor, low input current distortion, and good dynamic performance, but its output current is small and the cost is high. , cannot be used for high-power hydrogen production

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