请将下段话翻译成英语，语言要科学严谨：研究中，针对具有被动热管理特性的太阳能驱动的沼气/蒸汽改性反应器（SVMSR）提出了一种自适应P和PI控制策略，旨在在不断变化的太阳辐射条件下稳定产品组分和氢气产量。应用了自适应控制的思想，通过探索太阳变化特征与适当的控制目标之间的关系，建立了自适应法则，以获得适当的控制器设定点。P和PI控制器与2D多物理反应器模型相结合，以实现控制目标。最后，在实际变化的太阳辐射下测试了自适应法则和P和PI控制策略。结果表明，在变化的辐射条件下，双控制器在自适应法则的指导下可以提高平均氢气产量，同时在维持产品组分的稳定性的同时显著减少氢气产量的波动。

In the study, an adaptive P and PI control strategy for solar-driven biogas/steam modified reactor (SVMSR) with passive thermal management characteristics was proposed, aiming to stabilize product composition and hydrogen production under constantly changing solar radiation conditions. With the idea of adaptive control, an adaptive rule was established to obtain proper controller settings by exploring the relationship between solar variation characteristics and proper control targets. P and PI controllers were combined with 2D multi-physics reactor model to realize control objectives. Finally, the adaptive rule and P and PI control strategy were tested under varying solar radiation. The results showed that with the guidance of the adaptive rule, the dual controllers could improve the average hydrogen production while significantly reducing the fluctuation of hydrogen production while maintaining the stability of product composition under the changing radiation conditions.