Spectral Quantitative Analysis by Nonlinear Partial Least Squares Based on Neural Network Internal Model for Flue Gas of Thermal Power Plant
CAO Hui1, LI Yao-jiang1, ZHOU Yan2*, WANG Yan-xia1
1. State Key Laboratory of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China 2. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Abstract：To deal with nonlinear characteristics of spectra data for the thermal power plant flue, a nonlinear partial least square (PLS) analysis method with internal model based on neural network is adopted in the paper. The latent variables of the independent variables and the dependent variables are extracted by PLS regression firstly, and then they are used as the inputs and outputs of neural network respectively to build the nonlinear internal model by train process. For spectra data of flue gases of the thermal power plant, PLS, the nonlinear PLS with the internal model of back propagation neural network (BP-NPLS), the nonlinear PLS with the internal model of radial basis function neural network (RBF-NPLS) and the nonlinear PLS with the internal model of adaptive fuzzy inference system (ANFIS-NPLS) are compared. The root mean square error of prediction (RMSEP) of sulfur dioxide of BP-NPLS, RBF-NPLS and ANFIS-NPLS are reduced by 16.96%, 16.60% and 19.55% than that of PLS, respectively. The RMSEP of nitric oxide of BP-NPLS, RBF-NPLS and ANFIS-NPLS are reduced by 8.60%, 8.47% and 10.09% than that of PLS, respectively. The RMSEP of nitrogen dioxide of BP-NPLS, RBF-NPLS and ANFIS-NPLS are reduced by 2.11%, 3.91% and 3.97% than that of PLS, respectively. Experimental results show that the nonlinear PLS is more suitable for the quantitative analysis of glue gas than PLS. Moreover, by using neural network function which can realize high approximation of nonlinear characteristics, the nonlinear partial least squares method with internal model mentioned in this paper have well predictive capabilities and robustness，and could deal with the limitations of nonlinear partial least squares method with other internal model such as polynomial and spline functions themselves under a certain extent. ANFIS-NPLS has the best performance with the internal model of adaptive fuzzy inference system having ability to learn more and reduce the residuals effectively. Hence, ANFIS-NPLS is an accurate and useful quantitative thermal power plant flue gas analysis method.
Key words：Flue gas of thermal power plant;Spectroscopy quantitative analysis;Partial least squares;Neural network internal model
曹 晖1，李耀江1，周 延2*，王燕霞1 . 基于神经网络内部模型的非线性偏最小二乘法用于火电厂烟气光谱定量分析[J]. 光谱学与光谱分析, 2014, 34(11): 3066-3070.
CAO Hui1, LI Yao-jiang1, ZHOU Yan2*, WANG Yan-xia1 . Spectral Quantitative Analysis by Nonlinear Partial Least Squares Based on Neural Network Internal Model for Flue Gas of Thermal Power Plant . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2014, 34(11): 3066-3070.
