Research on Fault Warning of Coal Mill Based on Feature Selection and Multivariate Regression Prediction with BiLSTM

LUO Yun; LI Zhanguo; FU Longxia; WANG Daoyi; ZHANG Xinzhong; LI Yaohua; CHENG Liang; JIANG Xia

doi:10.19805/j.cnki.jcspe.2025.240145

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Research on Fault Warning of Coal Mill Based on Feature Selection and Multivariate Regression Prediction with BiLSTM

更新时间：2025-10-16

- Research on Fault Warning of Coal Mill Based on Feature Selection and Multivariate Regression Prediction with BiLSTM
- Chinese Journal of Power Engineering Vol. 45, Issue 5, Pages: 724-732(2025)
- 作者机构：
  
  1. 北京大唐高鸿数据网络技术有限公司,北京,100195
  2. 华北电力科学研究院有限责任公司,北京,100045
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240145
  CLC： TP18;TM621
- Published Online：19 May 2025，
  
  Published：2025
- 稿件说明：
移动端阅览
罗云,李战国,付陇霞,王道谊,张新中,李耀华,程亮,江霞. 基于特征选择与BiLSTM多变量回归预测的磨煤机故障预警研究动力工程学报, 2025, 45(5): 724-732 https://doi.

org/10.19805/j.cnki.jcspe.2025.240145
罗云,李战国,付陇霞,王道谊,张新中,李耀华,程亮,江霞. 基于特征选择与BiLSTM多变量回归预测的磨煤机故障预警研究动力工程学报, 2025, 45(5): 724-732 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240145.

org/10.19805/j.cnki.jcspe.2025.240145 DOI：

摘要

为解决火电设备多参数耦合、渐变性故障诊断困难的问题

提出了一种基于套索(LASSO) 回归特征选择与双向长短期记忆(BiLSTM)网络多变量回归预测的故障预警方法。以某1 000 MW机组磨煤机为研究对象

选取磨煤机电流、出口压力、出入口差压作为表征堵磨故障的特征参数

采用LASSO回归选择特征变量

基于BiLSTM算法建立多变量回归预测模型;根据堵磨时特征参数的变化机理与模型预测值构建堵磨故障指数

最后利用核密度估计方法计算预警阈值

实现了堵磨故障预警。通过实际数据分析表明:磨煤机正常状态时

BiLSTM多变量回归预测模型的平均相对误差为1.13%

相比传统的误差反向传播(BP)神经网络和支持向量机回归(SVR)模型具有更高的精度和预测参数变化趋势的能力;磨煤机异常状态时

相比成熟的多元状态估计技术(MSET)算法模型能更早地发现磨煤机运行的异常状态

实现磨煤机变工况下故障早期预警。

Abstract

To address the difficulty of fault diagnosis in thermal power equipment with multi-parameter coupling and gradual changes

a fault early warning method based on least absolute shrinkage and selection operator (LASSO) regression feature selection and bidirectional long-short term memory (BiLSTM) multivariate regression prediction was proposed. Taking a coal mill in a 1 000 MW power unit as the research subject

feature parameters such as mill current

outlet pressure

and inlet-outlet differential pressure were selected to represent blockage faults. LASSO regression was employed to select the feature variables

and a multivariate regression prediction model was established based on the BiLSTM algorithm. According to the variation mechanism of the feature parameters during mill blockage and the predicted values of the model

a mill blockage fault index was constructed. Finally

the warning threshold was determined using the kernel density estimation method

enabling mill blockage fault warnings. Actual data analysis shows that when the coal mill is operating normally

the average relative error of the BiLSTM multivariate regression prediction model is 1.13%. Compared with the traditional error back-propagation (BP) neural network and support vector regression (SVR) model

it has higher accuracy and the ability to predict the trend of parameter change. When the coal mill is operating abnormally

this method can detect operational abnormalities earlier than the multivariate state estimation technique (MSET) algorithm model

enabling early fault warning under variable operating conditions of the coal mill.

关键词

Keywords

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