论文部分内容阅读
再热蒸汽流量的软测量方法通常精确度不高或实时性不好。针对这个问题,该文研究了一种提高再热蒸汽流量测量实时性和准确性的方法。首先获得了基于简化热平衡方程的再热蒸汽流量稳态计算公式。该公式不包含待定参数,不需要用实验等手段来校正公式中的参数,且其计算精度相对其他公式来说也较高,然而该公式只适用于稳态工况。为此,又从精度不高的弗留格尔公式中提取了可以快速反映再热蒸汽流量变化的动态信息结构,并利用稳态计算公式在不同稳态工况下的计算值对其进行了参数标定,得到了动态计算公式。最后文章有效利用了稳态计算公式和动态计算公式的信息互补性,应用互补滤波器方法将上述2个公式在频域内进行了融合。经频域融合后得到的再热蒸汽流量不仅在机组稳态时准确度高还可以快速地反映再热蒸汽流量的变化。
Soft-sensing of reheat steam flow is usually less accurate or less real-time. In response to this problem, this paper studies a method to improve the real-time and accuracy of reheat steam flow measurement. First, the steady-state calculation formula of reheated steam flow based on the simplified heat balance equation is obtained. The formula does not include the parameters to be determined. There is no need to experimentally calibrate the parameters in the formula, and the calculation accuracy is higher than other formulas. However, the formula is only applicable to steady-state conditions. Therefore, the dynamic information structure that can reflect the change of reheat steam flow can be extracted from the Frugal formula with low precision, and the steady-state calculation formula is used to calculate the dynamic information under different steady-state conditions Parameter calibration, dynamic calculation formula. The last article makes effective use of the information complementarity of the steady-state calculation formula and the dynamic calculation formula. The two formulas are fused in the frequency domain by using the complementary filter method. The reheat steam flow obtained after frequency domain fusion not only reflects the change of reheat steam flow rapidly but also has high accuracy when the unit is in steady state.