煤层气井抽水机电动机变频-恒频分段节能控制策略

发布时间：2018-03-24 16:03

本文选题：煤层气抽水机　切入点：变频　出处：《煤炭学报》2016年08期

【摘要】：由于煤层气井抽水机电动机负荷的动态交变特性,导致抽水机电动机周期性运行于电动和发电状态,造成电能严重浪费。为解决这一问题,结合抽水机负载及悬点运动规律,提出一种基于变频器变频-恒频分段协调工作的抽水机电动机节能控制新策略。该控制策略取消了抽水机按上下冲程划分运行区间的做法,将运行区间重新划分为变频段和恒频段;在变频段改变抽水机电动机工作频率,将抽水机负荷端势能转化为动能,抽水机依靠自身能量转化运行,电动机不做功;在恒频段电动机工作于电动状态,驱动抽水机工作,此时电能转化为机械能。在现场以一台YVP180L-8,11 k W感应电机及其驱动的CYJY4-1.5-9 HB型煤层气井抽水机作为试验平台,对变频、恒频以及提出的变频-恒频分段节能控制策略进行综合节能情况对比。现场实测结果表明:所提控制策略会使抽水机运动和负荷特性发生改变;同时该控制策略能够有效解决能量回馈问题,避免能量回馈电机,较其他两种控制策略系统节电率提高10%;该控制策略具有较强通用性,为煤层气抽采系统节能降耗提供了新的研究思路和角度。
[Abstract]:Because of the dynamic alternating characteristic of the motor load of the pumping unit in the coalbed gas well, the pump motor runs periodically in the electric and power generation state, which results in the serious waste of electric energy. To solve this problem, combined with the moving law of the pumping machine load and the suspending point, A new energy saving control strategy for pumping machine motor based on frequency conversion and constant frequency section coordination of frequency converter is proposed, which cancels the method of dividing the operation interval of the pump according to the upper and lower stroke. The operating interval is divided into frequency conversion section and constant frequency band, the working frequency of the pump motor is changed in the variable frequency range, the potential energy at the load end of the pump is converted into kinetic energy, and the pump runs on its own energy, and the motor does not do work. In the constant frequency range, the motor works in the electric state and drives the pumping machine, and the electric energy is converted into mechanical energy. In the field, a YVP180L-811kW induction motor and its CYJY4-1.5-9 HB type coal-bed methane well pumping unit are used as the test platform, and the frequency conversion is compared. The comparison of energy saving situation between constant frequency and variable frequency and constant frequency subsection energy saving control strategy is carried out. The field test results show that the proposed control strategy will change the motion and load characteristics of the pump. At the same time, the control strategy can effectively solve the problem of energy feedback, avoid the energy feedback motor, compared with the other two control strategies, the power saving rate is increased by 10%. It provides a new research idea and angle for coal bed methane extraction system to save energy and reduce consumption.
【作者单位】：中国矿业大学(北京)机电与信息工程学院;山西蓝焰煤层气集团有限责任公司;深圳市禾望电气股份有限公司;
【基金】：山西省煤基重点科技攻关资助项目(MQ2014-06) 山西省科技重大专项资助项目(20111101001)
【分类号】：TD636

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