离合型偶合器传动箱的研制

介绍了油田钻井泵的配套型式及各种传动方式的特点,指出大庆油田需要一种离合型偶合器传动箱与交流电机匹配。详细介绍了该传动箱的工作原理、控制方式、实现的技术难点与产品的优点。分析了在现场运用过程中故障发生的原因及处理办法。     

垂直反车调速型液力偶合器传动箱的研制

介绍了垂直反车调速型液力偶合器传动箱的工作原理和结构,以及主要部件的设计计算。运用实践表明,该产品设计方案是正确、完整的;具有效率高、输出转速无极调速、快速离合等功能;质量安全可靠,符合安全、环保相关标准的规定,性能特点和齿轮、轴等主要零部件的强度寿命,完全可以满足现场运用要求。     

网电钻机改造用调速型液力偶合器的研制

介绍了网电钻机改造用调速型液力偶合器开发的背景及项目来源.从调速型液力偶合器技术、性能及设计方面存在的主要问题进行了分析,阐述了调速型液力偶合器的系统配置、工作原理、结构特点和主要技术参数,并对实际应用情况进行了分析,得出结论.     

石油钻机运用调速型偶合器的可行性研究

从调速型偶合器的工作原理、结构特点入手,分析调速型偶合器与油田钻机主要原动机的匹配特性及与钻机主要负载联合工作特性;得出在钻机上运用调速型偶合器是可行的这一结论。     

YOT750D调速型液力偶合器传动箱冷却装置的研制

从性能计算、结构设计、运用等方面,对YOT750D调速型液力偶合器传动箱冷却装置的研制情况进行了比较全面的介绍。     

推广调速型液力偶合器的可行性研究

阐述了调速型液力偶合器的工作原理及其与透平机械联合工作时的节能原理。分析了调速型液力偶合器与通用机械匹配的经济效益以及在钢厂、电厂、油田等领域的运用前景,得出其可以大范围推广的结论。     

油田直联驱动泥浆泵用集成机组

介绍了直联驱动泥浆泵用垂直反车调速型偶合器传动箱集成机组的研制情况。该机组的柴油机和垂直反车调速型偶合器传动箱安装在同一个公共底架上,柴油机通过一根较短的高弹联轴器与垂直反车传动箱相连。垂直反车传动箱输入轴中心与柴油机输出轴中心高保持一致,而其输出轴中心较柴油机输出轴中心高出一定距离,以达到与泥浆泵输入轴进行直联匹配的目的。垂直反车传动箱输出端通过万向轴与泥浆泵直接连接,机组可以对泥浆泵实现无级调速和离合功能。公共底架与泥浆泵的安装架之间有两套固定机构,以保持两底架稳固联接,使机组平稳、安全运行。     

调速型液力偶合器在75t/h锅炉房中的应用

本文叙述了应用调速型液力偶合器调速技术的意义及其节能的基本工作原理。重点介绍了利用该技术在云南弄璋糖厂７５ｔ／ｈ锅炉房鼓风机、引风机和排粉风机上的应用,并取得了明显的节能效果。     

Frequency support capability of variable speed wind turbine based on electromagnetic coupler

In the variable speed wind turbine based on electromagnetic coupler (WT-EMC), a synchronous generator is directly coupled with grid. So like conventional power plants WT-EMC is able to support grid frequency inherently. But due to the reduced inertia of synchronous generator, its frequency support capability has to be enhanced. In this paper, the frequency support capability of WT-EMC is studied at three typical wind conditions and with two control strategies—droop control and inertial control to enhance its frequency support capability. The synchronous generator speed, more stable than the grid frequency which is the input signal for Type 3 and Type 4 wind turbine frequency support controller, is used for the calculation of WT-EMC supplementary torque command. The integrated simulation environment based on the aeroelastic code HAWC2 and software Matlab/Simulink is used to build a 2 MW WT-EMC model and study the frequency support capability of a wind farm consisting of WT-EMC.     

Comprehensive control strategy for a variable speed cage machine wind generation unit

A comprehensive control strategy, that addresses all three control objectives in a wind generation system, i.e. control of the local bus voltage to avoid voltage rise, capture of the maximum power in the wind and minimization of the power loss in the induction generator is proposed. The control signals are the desired current wave shapes (instantaneous three-phase currents) of the rectifier and the inverter in a double-sided PWM converter system connected between the wind generating unit and the grid. Studies performed on a complete model for a variable speed cage machine wind generation unit, including wind profile, wind turbine, induction generator, PWM converter, local load and transmission line, show that even as the wind speed changes randomly, the proposed control strategy leads the system to the optimum operating conditions.     

机车车钩拆装车的研制及使用

针对机车车钩的修理耗时和不安全问题,研制了一种车钩拆装专用设备,并进行了试验和实际使用。实际使用的结果表明,该设备具有拆装方便、工作效率高及安全可靠等优点。介绍了该设备的结构、工作原理、技术参数及应用情况,并给出了用ANSYS软件对车钩拆装车挡板和平台进行强度分析的结果。     

液粘调速装置在节能减排中的应用

针对水泵风机采用恒速节流调节运行时存在浪费大量电能的问题,吉林油田水厂选用液粘调速装置改造水泵机组后,通过改变水泵和风机转速调整水量、风量,使轴功率大幅度降低,节约大量电能,经济效益可观。     

Small-signal model and dynamic analysis of variable speed induction machine wind farms

A unified, modular, small-signal dynamic model for an induction machine-based wind farm is presented. The proposed model can represent an arbitrary number of fixed-speed, partially variable-speed (doubly fed) and variable-speed induction machine-based wind units in a wind farm. The model represents the dynamics of (i) each wind turbine-generator electromechanical system, (ii) each converter system and the corresponding controls and (iii) the host electrical grid, within the subsynchronous frequency range (0.1?60 Hz). In contrast to the widely used state-space formulation, the proposed approach is based on developing electrical and mechanical transfer-function matrices to formulate the overall system as a multivariable feedback system. Thus, it provides significant flexibility to represent a large number of wind units and their controllers, identical or nonidentical, within a wind farm. Based on the developed model, a frequency response-based method is also introduced, as an alternative to the eigen analysis approach, for small-signal subsynchronous dynamic analysis of the wind farm and its host electrical grid. The proposed method provides a new performance robustness criterion for performance evaluation and also a design tool based on the `size? of the system transfer-function matrix. The concept of induced norm is adopted here as a measure of matrix size. As an example, applications of the model and the analysis approach to a twounit wind farm is presented and the results are validated based on time-domain simulation studies in the PSCAD/ EMTDC environment.     

Virtual inertia for variable speed wind turbines

Inertia provision for frequency control is among the ancillary services that different national grid codes will likely require to be provided by future wind turbines. The aim of this paper is analysing how the inertia response support from a variable speed wind turbine (VSWT) to the primary frequency control of a power system can be enhanced. Unlike fixed speed wind turbines, VSWTs do not inherently contribute to system inertia, as they are decoupled from the power system through electronic converters. Emphasis in this paper is on how to emulate VSWTs inertia using control of the power electronic converter and on its impact on the primary frequency response of a power system. An additional control for the power electronics is implemented to give VSWTs a virtual inertia, referring to the kinetic energy stored in the rotating masses, which can be released initially to support the system's inertia. A simple Matlab/Simulink model and control of a VSWT and of a generic power system are developed to analyse the primary frequency response following different generation losses in a system comprising VSWTs provided with virtual inertia. The possibility of substituting a 50% share of conventional power with wind is also assessed and investigated. The intrinsic problems related to the implementation of virtual inertia are illustrated, addressing their origin in the action of pitch and power control. A solution is proposed, which aims at obtaining the same response as for the system with only conventional generation. The range of wind speeds near the power limitation zone seems to be the most critical from a primary response point of view. The theoretical reasons behind this are elucidated in the paper. Copyright © 2012 John Wiley & Sons, Ltd.     

Simplified steady-state modeling for variable speed compressor

This paper presents a detailed analysis of semi-empirical methods to calculate mass flow rate, shaft power and discharge temperature for three types of variable speed compressors: reciprocating, scroll and piston rotary. The proposed methods are an integration of physical-based models for constant speed compressor and the physical characteristics of volumetric efficiency and isentropic efficiency between different speeds. The physical-based models were first validated with good agreement with experimental data from publication for the three types of constant speed compressors. The comparison between modeling results and experimental data from publication for the three types of variable speed compressors shows the RMS errors are less than 3%, 3% and 3 °C for refrigerant mass flow rate, compressor power input and discharge temperature, respectively. The model of variable speed compressor will allow the reduction of the number of experimental data required to characterize variable speed compressor behavior in the modeling of refrigeration systems because of its physical mechanisms.     

Multivariable control strategy for variable speed, variable pitch wind turbines

Reliable and powerful control strategies are needed for wind energy conversion systems to achieve maximum performance. A new control strategy for a variable speed, variable pitch wind turbine is proposed in this paper for the above-rated power operating condition. This multivariable control strategy is realized by combining a nonlinear dynamic state feedback torque control strategy with a linear control strategy for blade pitch angle. A comparison with existing strategies, PID and LQG controllers, is performed. The proposed approach results in better power regulation. The new control strategy has been validated using an aeroelastic wind turbine simulator developed by NREL for a high turbulence wind condition.