基于LabVIEW的潜油电机自动无功补偿控制系统研究

发布时间：2018-06-21 05:48

本文选题：潜油电机 + LabVIEW　；参考：《东北石油大学》2015年硕士论文

【摘要】：潜油电机是油田企业中经常运用的特种采油作业设备,其应用广泛,是油田企业的重要用电设备。潜油电机在其运行中会消耗大量无功功率,会严重影响电能的质量,对电网的质量、设备安全、经济用效益方面也会产生诸多不利影响。近年来虚拟仪器技术在工程测试中发展迅速,运用虚拟仪器技术,对潜油电机自动无功补偿进行控制有着良好的实用性。传统的无功补偿器不能动态快速地满足变动负荷无功补偿要求,静止无功发生器(SVG)作为一种新型无功补偿装置,在对变动负荷无功的补偿方面具有优越性。因此本文在学者研究的基础上开发优化适合补偿潜油电机的无功补偿控制系统,本文研究的潜油电机自动无功补偿系统对油田企业用电效率的提高和能源节约有着深远影响。本文首先对无功补偿装置的发展情况进行综述,结合潜油电机的基本结构和运行特点分析研究了无功发生器的原理。在掌握基于d-q坐标变换的瞬时无功电流检测方法的基础上,研究了锁相环替换的瞬时无功电流提取新方法。该检测原理结构与传统三相电压不对称系统中无功电流检测方法相比,其检测原理结构简单、运算量相对较小、具有一定灵活性、运算过程中可减少误差并能直接运用在三相电压对称或不对称系统中。其次,在分析了无功发生器的控制策略基础上,文章针对不对称系统提出新的电流直接控制方法,即基于d-q坐标变换的正序、负序基波无功电流同步补偿的电流直接控制方法。正序控制器完成正序无功分量补偿,负序控制器完成负序无功分量补偿,两个控制器同时工作。最后,本文设计了基于LabVIEW的潜油电机自动无功补偿控制系统的硬件电路和LabVIEW软件程序开发,该系统能够实现潜油电机软启动、电机相关运行参数的采集和显示、SVG自动无功补偿控制算法的开发、历史数据查询与存储、报表生成以及故障提示。从实验结果可得出以下结论,所设计的潜油电机自动无功补偿控制系统能够动态进行无功功率补偿并对系统电流的不平衡起到有效抑制作用,这证明了优化改进的控制算法的可靠性与系统运行的合理性,因此本文所设计的潜油电机自动无功补偿控制系统具有良好的理论与实际应用价值。
[Abstract]:Submersible motor is a kind of special oil production equipment which is often used in oil field enterprises. It is widely used and is an important electric equipment in oil field enterprises. The submersible motor will consume a large amount of reactive power in its operation, which will seriously affect the quality of electrical energy, the quality of the power grid, equipment safety, economic benefits will also have a lot of adverse effects. In recent years, virtual instrument technology has developed rapidly in engineering testing, and it has good practicability to control submersible motor automatic reactive power compensation by using virtual instrument technology. The traditional reactive power compensator can not meet the demand of variable load reactive power compensation dynamically and quickly. As a new type of reactive power compensation device, static Var Generator (SVG) has advantages in the compensation of variable load reactive power. Therefore, based on the research of scholars, this paper develops and optimizes the reactive power compensation control system for submersible motor. The automatic reactive power compensation system of submersible motor studied in this paper has a profound impact on the improvement of power efficiency and energy saving in oil field enterprises. In this paper, the development of reactive power compensator is reviewed firstly, and the principle of reactive power generator is analyzed and studied according to the basic structure and operation characteristics of submersible motor. On the basis of mastering the instantaneous reactive current detection method based on d-q coordinate transformation, a new method of instantaneous reactive current extraction by phase-locked loop replacement is studied. Compared with the traditional reactive current detection method in the three-phase voltage asymmetry system, the structure of the detection principle is simple, the calculation is relatively small, and the detection principle is flexible. It can reduce the error and can be directly used in the three-phase voltage symmetric or asymmetric system. Secondly, on the basis of analyzing the control strategy of the reactive power generator, this paper proposes a new direct current control method for the asymmetric system, that is, the direct current control method based on the positive sequence and negative sequence fundamental wave reactive current synchronous compensation based on d-q coordinate transformation. The positive sequence controller compensates the positive sequence reactive power component and the negative sequence controller completes the negative sequence reactive power component compensation. The two controllers work at the same time. Finally, the hardware circuit and LabVIEW software program of the submersible motor automatic reactive power compensation control system based on LabVIEW are designed. The system can realize the soft start of the submersible motor. The development of SVG automatic reactive power compensation control algorithm, historical data query and storage, report generation and fault prompt. From the experimental results, the following conclusions can be drawn: the designed automatic reactive power compensation control system of submersible motor can dynamically compensate reactive power and effectively restrain the imbalance of system current. This proves the reliability of the optimized and improved control algorithm and the rationality of the system operation. Therefore, the automatic reactive power compensation control system for submersible motor designed in this paper has good theoretical and practical application value.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE938

【参考文献】