Designed damping controller for SSSC to improve stability of a hybrid offshore wind farms considering time delay

This paper presents the stability improvement results of hybrid doubly fed induction generator (DFIG)-based and permanent magnet generator (PMG)-based offshore wind farms (OWFs) using a static synchronous series compensator (SSSC). An adaptive-network-based fuzzy inference system (ANFIS) controller of the proposed SSSC is designed to render adequate damping characteristics to the studied system. A frequency-domain approach based on a linearized system model using eigenvalue technique analysis is performed. A time-domain scheme based on a nonlinear system model subject to a three-phase short circuit fault at infinite bus with variations in the signal transmission delays has also been investigated to compare the damping of the studied system in cases of with and without controller. The simulation results with MATLAB/SIMULINK toolbox have been presented. It can be concluded from the simulation results that the proposed SSSC joined with the designed ANFIS damping controller can offer adequate damping performance to the studied hybrid DFIG-based and PMG-based OWFs under severe disturbance.     

连续油管技术与装备发展综述

自世界上第一台连续油管作业机问世至今,连续油管作业技术与装备已经过了40多年的发展历程,以其占地面积小、作业成本低、搬迁安装方便、保护油层、增加油井产量和使用范围广等诸多不可比拟的优势,得到迅速发展,并广泛应用于钻井、完井、试油、采油、修井和集输等各个作业领域。实践表明,连续油管作业技术与装备是一项具有巨大潜力和生命力的实用性技术。目前,该项技术的应用日趋活跃,备受关注。在总结连续油管作业技术与装备的发展现状和展示其发展趋势的基础上,客观地分析了国内连续油管技术与装备的应用与研究现状,提出相应的发展对策。     

氧活化测井在油套分注及工程问题井中的应用

氧活化水流测井是测量井下水流速度的测井方法之一.它利用具有强穿透能力的高能快中子和伽马射线,可穿过油管、套管甚至水泥环测得随水流动的活化氧伽马信号,通过解析测得的伽马时间谱来计算相应的水流速度,并在已知流动截面面积时进一步算出水流量.它的非接触测量能力使它在解决常规生产测井仪难以有效解决的某些特殊问题上独具优势,如油套分注井油管和油套环空中水流量的分别测量、管柱窜漏位置检测、水井封隔器密封性检测、遇阻深度以下单层吸水量的推断等.列举了大港油田在这方面的4个应用实例.     

就地补偿在动力厂水泵电机上的应用实例

就我公司动力厂给水车间155kW水泵电机无功就地补偿的可行性及经济效益进行了分析和研究，对工厂用电如何节能降耗有一定的参考价值。     

油管漏磁探伤工艺与应用

简要介绍了漏磁探伤的基本原理及工艺流程与设备仪器，并对油管的常见损伤缺陷进行了分析。     

基于计算机视觉的油管螺纹非接触智能检测

针对传统接触式油管螺纹参数测量方法的缺点,开发了基于计算机视觉的油管螺纹非接触智能检测系统。在简述非接触智能检测测量原理和测量系统组成的基础上,详细介绍了利用非接触智能检测系统对油管螺纹参数进行测量的方法,其中包括图像的采集及预处理,图像的锐化,螺纹边缘轮廓的检测与提取,螺纹尺寸的测量计算与对比分析。     

Transient analysis of an advanced static var compensator using quad-series voltage-source PAM inverters

This paper deals with an advanced static Var compensator (ASVC) using quad-series voltage-source PAM inverters. The ASVC consists of four three-phase voltage-source inverters with a common dc capacitor and four three-phase transformers, each primary winding of which is connected in series with each other. Each inverter outputs a square-wave voltage, while the synthesized output voltage of the ASVC has a 24-step wave shape. This results not only in a great reduction of harmonic currents and dc voltage ripples but also in fewer switching and snubbing losses. In this paper, transient analysis is performed with the focus on the response of reactive power and the resonance between the dc capacitor and ac reactors. Experimental results obtained from a small-rated laboratory model of 10 kVA are also shown to verify analytical results based on the p-q transformation. The analytical results help in the design of system parameters such as the capacity of the dc capacitor and feedback gains.     

线性复合片补偿器

本文给出一种特殊复合延迟片——复合片补偿器。改变入射线偏振光的振动方位角,便可改变补偿器的延迟量,调整简单,精度高。     

管具螺纹的数控加工及修理技术应用

从现场实用的角度对比分析了手动、数控2种修螺纹方法,提出了在管具修理工作中研究推广数控技术车修管螺纹的必要性,介绍了试验研究过程中的技术问题。     

提高连续油管使用寿命的方法

从采用软件跟踪疲劳寿命 ,截断法 ,变径连续油管 ,反转使用连续油管 ,防止连续油管损伤 ,合理配置设备 6个方面讨论了控制管串疲劳 ,提高连续油管使用寿命的方法 ,并得出结论 :控制管串疲劳的方法中 ,最有效的方法是实际作业截断法。指出要尽量减少连续油管在带内压下工作 ,也要研究开发降阻性能好的工作液 ,以延长连续油管使用寿命、降低作业风险。