Photovoltaic water electrolysis hydrogen production can improve the utilization rate of photovoltaic solar hydrogen production system further

while it needs to work in a wide range of output voltage. A DC-coupled photovoltaic hydrogen production system based on multi-resonant converter is proposed

which can meet the efficient production of hydrogen energy. The working principle of the multi-resonant converter is analyzed

and the sequence quadratic planning method is introduced to solve the complicated parameter design of the multi-resonance converter. On this basis

the experimental prototype is designed and verified. The experimental results show that

the hardware circuit parameters of the photovoltaic hydrogen production system based on the multi-resonant converter has reasonable design

which can meet the requirements of width gain(output voltage 200～650 V) and high efficiency(97.24%) of the converter

reduce the loss caused by the converter due to reactive power cycle

and enhance the efficiency of photovoltaic hydrogen production.