求翻译：目前国内600MW超临界机组再热汽温普遍采用烟气挡板的调节方式，存在时滞性大，调节精度不高的特点，本文结合大别山电厂热控系统技术改造的成功经验，阐述了一套再热汽温调节优化方案，即以烟气挡板为主，有较强的前馈信号（机组负荷指令）作用，近似于开环控制的一种闭环控制方式。是什么意思？

Currently domestic 600MW Super critical unit then hot steam temperature General used flue gas bezel of regulation way, exists Shi delay sexual large, regulation precision not high of features, this article combination dabie mountains power plant hot controlled system technology of successfully experience, elaborated has a then hot steam temperature regulation optimization programme, is to flue gas bezel mainly, has strong of Qian fed signal (unit load directive) role, approximate Yu open ring control of a closed ring control way.