Electrolytic hydrogen production rectification power supply based on two-stage auxiliary converter and power supply control method

Abstract

The invention discloses an electrolytic hydrogen production rectification power supply based on a two-stage auxiliary converter and a power supply control method. The electrolytic hydrogen production rectification power supply comprises a voltage source type PWM converter, a phase-shifted full-bridge converter, a multi-pulse thyristor converter, a three-phase LC filter, direct-current smoothing reactors L1 and L2, a decoupling capacitor Cs and a control device. And the multi-pulse thyristor converter is connected in parallel with a two-stage AC-DC converter. The multi-pulse thyristor converter is a main power rectifier and provides main power for a load, and the two-stage AC-DC converter is an auxiliary power rectifier and is used for compensating output ripples and input harmonics generated by thyristor rectifiers. After compensation, the ripple content of the direct current output total current of the hydrogen production rectification power supply is greatly reduced, the hydrogen production efficiency can be effectively improved, alternating current input harmonic waves are effectively suppressed, the electric energy quality can be improved, and high-power, low-cost and high-efficiency hydrogen production is realized.

Description

technical field [0001] The invention relates to the field of hydrogen production power supplies, in particular to an electrolytic hydrogen production rectification power supply and a power supply control method based on a two-stage auxiliary converter. 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 hy...

AI Technical Summary

Problems solved by technology

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

Moreover, the total harmonic distortion degree of the harmonics generated by the rectifier is often greater than 5% without any compensation device, which cannot meet the harmonic requirements of the IEEE519 standard

Directly using pulse width modulation (PWM) rectifiers in small and medium power applications 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 too high to be used for high-power hydrogen production

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