基于OS-ELM的游梁式抽油机系统电动机负载扭矩的在线混合建模

doi:10.11949/j.issn.0438-1157.20161194

化工学报 ›› 2017, Vol. 68 ›› Issue (6): 2465-2472.DOI: 10.11949/j.issn.0438-1157.20161194

基于OS-ELM的游梁式抽油机系统电动机负载扭矩的在线混合建模

李琨¹, 韩莹¹, 李申明², 王通³

1. 渤海大学工学院, 辽宁锦州 121013;
2. 中冶焦耐工程技术有限公司, 辽宁大连 116085;
3. 沈阳工业大学电气工程学院, 辽宁沈阳 110870

收稿日期:2016-08-26 修回日期:2017-02-28 出版日期:2017-06-05 发布日期:2017-06-05
通讯作者: 李琨
基金资助:
国家自然科学基金项目（61403040）；辽宁省博士科研启动基金项目（201601163）

OS-ELM-based hybrid online modeling for motor load torque of beam pumping units

LI Kun¹, HAN Ying¹, LI Shenming², WANG Tong³

1. College of Engineering, Bohai University, Jinzhou 121013, Liaoning, China;
2. ACRE Coking & Refractory Engineering Consulting Corporation, Dalian 116085, Liaoning, China;
3. School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, Liaoning, China

Received:2016-08-26 Revised:2017-02-28 Online:2017-06-05 Published:2017-06-05
Contact: 10.11949/j.issn.0438-1157.20161194
Supported by:
supported by the National Natural Science Foundation of China (61403040) and Dr. Research Start-up Fund of Liaoning Province (201601163)

摘要/Abstract

摘要：

由于难以掌握电动机工作效率与复杂动态负载的准确关系，游梁式抽油机系统普遍存在“大马拉小车”的现象。针对这个问题，研究负载动态变化下电动机负载扭矩的建模新方法，将“驴头”悬点载荷看作系统的负载，提出了基于OS-ELM的在线混合模型。首先根据采油工作原理，建立系统各机构的机理模型；然后针对模型中的主要不确定参数——井下摩擦力，建立基于OS-ELM的在线软测量模型，首先由历史生产数据离线训练得到初始结构，其次采用滑动窗口方法指导模型的在线更新。通过研究，井下摩擦力不再是依赖主观经验给定的定值，而是跟随系统变化的动态值，这更加符合实际生产工况。由一口生产井进行实例验证，仿真结果表明本文所提出方法是合理有效的。

关键词: 混合建模, 游梁式抽油机, 电动机负载扭矩, OS-ELM模型, 井下摩擦力, 测量, 石油, 模型

Abstract:

Pumping motor with large electrical horsepower for small power-consuming equipment is commonly seen in beam pumping units, as it is difficult to understand exact relationship between motor working efficiency and complex dynamic loads. An online hybrid model for motor load torque under dynamic load changes was proposed by online sequential-extreme learning machine (OS-ELM) with a consideration of polished rod loads as the system's loads. First, mechanism models of each part in the pumping unit were separately built according to working principles of the system. Then, OS-ELM-based online soft sensor model was built to obtain value for a critical uncertain variable, the underground friction. Original structure of the soft sensor model was first set by offline training with historical production data and then online updated by a sliding window method. Therefore, the underground friction is no longer a constant value, which was given by any subjective experience in most other studies, but a dynamic value following system changes, which is more in line with actual operation conditions. The simulation results of proposed method on a normal oil well demonstrated validness and effectiveness.

Key words: hybrid modeling, beam pumping units, motor load torque, OS-ELM model, underground friction, measurement, petroleum, model

中图分类号:

TP29

李琨, 韩莹, 李申明, 王通. 基于OS-ELM的游梁式抽油机系统电动机负载扭矩的在线混合建模[J]. 化工学报, 2017, 68(6): 2465-2472.

LI Kun, HAN Ying, LI Shenming, WANG Tong. OS-ELM-based hybrid online modeling for motor load torque of beam pumping units[J]. CIESC Journal, 2017, 68(6): 2465-2472.

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基于OS-ELM的游梁式抽油机系统电动机负载扭矩的在线混合建模

OS-ELM-based hybrid online modeling for motor load torque of beam pumping units

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