• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Disclosed are a method and system for damping torsional oscillation in a rotary drive train having a prime mover (13) and at least one coupling means (14a-14d). The method comprises (a) establishing an electric motor as an auxiliary drive in series with said prime mover, or using an existing auxiliary drive if this is an electric motor; (b) monitoring the torsional oscillation of the coupling agent (14a-14d); and (c) using a variable speed drive system (17) with a direct drive regulated governor (19) or with a prime mover switching power scheme of the prime mover to apply damping torque to the powertrain via said auxiliary drive, wherein the damping torque is at the same frequency and is applied in antiphase to the rotational speed of the disturbing torsional oscillation.
    公开号:CH703555B1
    申请号:CH01293/11
    申请日:2011-08-04
    公开日:2016-01-15
    发明作者:Dr Adrian Zuckerberger
    申请人:Dr Adrian Zuckerberger；
    IPC主号:
    专利说明:

    Field of the invention
    The present invention relates to a method and system for damping torsional oscillation, particularly in a long drive train, such as in liquefied natural gas applications.
    Background of the invention
    In a natural gas liquefaction plant (LNG train), power is transmitted from the prime mover to one or more compressors via a long shaft. The method of power transmission includes torque and speed transmission, and the prime mover usually includes a gas turbine and an electric starter motor (starter) or a main electric motor and an auxiliary auxiliary motor. Torsional oscillations may in particular occur when the mass of the moving parts is large and distributed, or in other words, when the shaft is long and the components mounted on the shaft have large moments of inertia in combination with low damping. Because of the low damping, a relatively small amount of force is needed to excite a resonant torsional oscillation. This excitation can be given by mechanical or electrical means. On the mechanical side, the excitation can be caused by sudden changes in the mechanical load over a wide excitation frequency range. On the electrical side, there are several reasons for torsional vibrations, of which only two are mentioned: the startup noise can cause excitation, and the switching frequency of the power semiconductors (in LCI systems) can be an additional cause.
    Torsionsoszillationen can cause significant damage to the drive train or its components. If the driveline fails, i.e., a break due to the torsional load due to the high level of mechanical energy of the driveline's rotating components, this can lead to the destruction of the driveline connected parts. Even if the damage is noticed in time, repairs are complex and, especially due to the decommissioning during the repair period, very expensive (sudden fault costs). Because simple machine shutdown is possible, but also economically disadvantageous, in the occurrence of torsional oscillations, a variety of systems (e.g., preventative maintenance systems) have been developed to prevent such events.
    The prior art and its advantages have been described in detail in the background of US Pat. No. 7,518,344 "Method and damping device for damping and torsional vibration in a rotating drivetrain" in the name of Shiler. Shiler provides a new method purporting to overcome the shortcomings of previous methods, but Shiler's method itself has some limitations as well. The main disadvantages are:
    The method according to Shiler requires the measurement of one or more signals (see claim 5). In some applications such direct measurements are not trivial (e.g., sensitive sensor installation in hazardous areas). The method is based on a "current source inverter" (the energy is stored in a coil (see claim 11 and Fig. 3) which inherently has a limited bandwidth). The attenuation of high frequency signals can be problematic.
    Shiler claims that the energy can be stored in a capacitor, and such a system is shown in FIG. In our opinion, this system is far from being suitable for LNG applications because of the limited number of possible components.
    The present invention uses two well known technologies; variable speed drive system (VSDS) and direct torque control (DTC). These systems or technologies are described in detail in the publication of the company ABB Technical Guide no. 1 / Direct Torque Control - the world's most advanced AC drive technology », which is available at the following link: http://www.ab-drives.com/StdDrives/RestrictedPages/Marketing/Documentation/files/PRoducts/DTCTechGuide1.pdf
    Summary of the invention
    The present invention relates to a method and a system for damping a torsional oscillation in a rotary drive train according to the independent claims and serves to reduce the clutch aging and the clutch failure in long drive systems, i. to increase the mean time between failures (MTBF), especially in natural gas liquefaction plants.
    One of the most damaging vibrations is the low-frequency spurious (10-100 Hz), which occurs along the drive system. According to the present invention, a monitoring means and method is used to identify the frequency and amplitude of the spurious vibration as well as the weakest coupling. Now, dedicated software (Wide Band Torque Loop) and the VSDS (Variable Speed Drive System) are used to transmit a monitored vibration-proportional system of equal frequency and amplitude, but in antiphase along the drive system into the torque loop. The disturbing real vibration is damped and the damage potential is reduced. The injected torque harmonic is calculated based on the intended transfer function between the auxiliary motor shaft and the respective point along a long shaft of the drive train. The transfer function and parameters of the transfer function result in a known manner from the monitoring of the torsional oscillations relative to the disturbed parameter, such as speed, acceleration, etc. The monitored parameters are thus transferred into the injected torque harmonic.
    According to a preferred embodiment of the present invention, there is provided a method for damping torsional oscillation in a rotary drive train having a prime mover and at least one coupling means, comprising the steps of: (a) establishing an electric motor as an auxiliary drive in series with said one Drive machine or use of an existing auxiliary drive, if this is an electric motor; (b) monitoring the torsional oscillation of the coupling agent; and (c) using a variable speed drive system (VSDS drive system) with a (direct torque control) highly dynamically controlled direct torque control (DTC) drive to apply a damping torque via said auxiliary drive to the drive train, wherein the damping torque at the same frequency and is applied in antiphase to the rotational speed of the disturbing torsional oscillation.
    According to another preferred embodiment, a damping method is provided, wherein the monitoring is performed according to the transfer function parameters of the string, which are only sampled, and which monitoring is occasionally updated, preferably during the preprogrammed maintenance time periods.
    According to another preferred embodiment, a damping method is provided, wherein instead of monitoring the torsional oscillation, this torsional oscillation (if the system allows such installations) is continuously recorded by at least one sensor, which sensor provides feedback for the DTC torque loop. The damping torque is created by the controller.
    According to another aspect of the present invention, there is provided a system for damping torsional oscillation in a rotary drive train having a prime mover and at least one coupling means, said system comprising:<tb> (a) <SEP> an electric motor provided as an auxiliary drive in series to said engine, optionally, an auxiliary drive existing in the engine can be used when such an auxiliary drive exists in the system as a starter;<tb> (b) <SEP> a monitoring means for monitoring the torsional oscillation of the coupling agent; and<tb> (c) <SEP> a variable-speed drive system with a highly dynamically controlled drive with direct torque control (DTC drive), which is provided for feeding a damping torque via said auxiliary drive to the drive train, wherein the damping torque same frequency and anti-phase relative to Having rotational speed of the disturbing torsional oscillation.
    According to a preferred embodiment, a damping system is provided, wherein the monitoring is calculated in accordance with the transfer function parameters of the train, which are only sampled, and which monitoring is updated from time to time, preferably during the pre-programmed maintenance time periods.
    According to another preferred embodiment, the damping system further comprises at least one sensor for continuously recording the torsional oscillation, and wherein the recorded torsional oscillation is used as a feedback to the DTC drive which uses this feedback to apply the damping torque, i. H. feed.
    Brief description of the drawings
    The invention will be described below with reference to the accompanying drawings, which should be understood only in terms of an example. With particular reference to the drawings in detail, it should be emphasized that the details shown therein are merely exemplary and exclusively for illustrative discussion of a preferred embodiment of the present invention, and that they are presented for the purpose of providing what the most useful and most easily understood description of the principles and concept aspects of the invention. In this connection, no attempt is made to show the structural details of the invention in more detail than is necessary for a thorough understanding of the invention. The description, together with the drawing, clearly shows to those skilled in the art how the various forms of the invention can be practiced.
    The enclosed figures illustrate:<Tb> FIG. 1 <SEP> illustrates a natural gas liquefaction plant with a damping system according to the present invention.
    Description of the Preferred Embodiments
    The present invention is a method and system for damping torsional oscillations in a rotating drive train.
    The principles and operation of the damping method and system according to the present invention can be better understood with reference to the figure and the accompanying description.
    Fig. 1 illustrates a typical natural gas liquefaction plant (LNG train) with the damping system according to the present invention. The natural gas liquefaction plant 10 typically includes a transformer 11 which drives the prime mover 13, which is normally a high performance engine, e.g., via a variable speed drive system (VSDS) 12. 50 MVA, and which can be a synchronous motor. The prime mover 13 sets a series of compressors 15 in rotation while all of these components are coupled together by clutches 14a, 14b, 14c and 14d. These clutches 14 are weak points of the natural gas liquefaction plant 10 and can be caused by a low frequency spurious (10-100 Hz) occurring along the drive system, i. Torsional oscillation, damaged.
    To dampen this torsional oscillation, a second motor 16 is added to the natural gas liquefaction plant 10, which is driven by a second VSDS 17 and a second transformer 18. The power of the second motor 16 is smaller than that of the main motor 13, e.g. 5 MVA, and it is an asynchronous motor, which can also be used as a starter or as an auxiliary drive. The second VSDS 17 is controlled by a control scheme for large fire widths or preferably by direct torque control (DTC) 19.
    The torsional oscillation can be monitored or measured. A supervisor 20 uses the system data 21 to monitor the torsional oscillation on the main stressed clutch (i.e., clutch 14a, 14b, 14c, or 14d). This information is provided by the supervisor 20 to the DTC controller, i. H. the DTC controlled drive 19, which controls the second VSDS 17 to generate an alternating current torque signal in antiphase with the torsional oscillation and to feed it along the drive train. The damping torque is applied at the same frequency and in antiphase to the rotational speed of the disturbing torsional oscillation.
    According to a preferred embodiment, at least one sensor is provided in the natural gas liquefaction plant 10 in order to continuously receive the torsional oscillation. The measurements 22 are provided to the DTC controller 19, which controls the second VSDS 17 to generate an alternating current torque signal in antiphase with the torsional oscillation and to feed it along the drive train. The damping torque is applied at the same frequency and in antiphase to the rotational speed of the disturbing torsional oscillation.
    Although the invention has been described in conjunction with specific embodiments, it will be apparent that many alternatives, modifications and variations will be apparent to those skilled in the art. Accordingly, it is intended that this invention cover all such alternatives, modifications and variations that are within the scope of the appended claims.
    权利要求:
    Claims (6)
    [1]
    A method of damping torsional oscillation in a rotary drive train (10) having a prime mover and at least one coupling means (14a-14d), comprising the following steps:(A) establishing an electric motor (16) as an auxiliary drive in series with said drive machine or using an auxiliary drive provided in the drive machine;(b) monitoring the torsional oscillation of said coupling means (14a-14d); and(c) using a variable speed drive system (17) with a direct drive regulated torque drive (19) or with a prime mover switching power scheme of the prime mover to apply a damping torque to the powertrain (10) by said auxiliary drive (16) the damping torque is applied at the same frequency and in opposite phase to the rotational speed of the disturbing torsional oscillation.
    [2]
    2. Method according to claim. 1, wherein in said monitoring parameters of a transfer function of the powertrain are monitored, wherein the transfer function is updated during preprogrammed maintenance periods.
    [3]
    3. The method according to claim 1, wherein in said monitoring of the torsional oscillation said torsional oscillation is continuously absorbed by at least one sensor, which sensor provides feedback to said regulated drive (19), the controlled drive using said feedback to cause said torsional oscillation Apply damping torque.
    [4]
    A system for damping torsional oscillation in a rotary drive train (10) having a prime mover and at least one coupling means (14a-14d), said system comprising:(A) an existing in the prime mover auxiliary drive or an additional electric motor (16) as an auxiliary drive in series with said drive machine;(b) monitoring means (20) for monitoring the torsional oscillation of said coupling means (14a-14d); and(C) a variable-speed drive system (17) with a controlled drive (19) with direct torque control or with a control scheme for switching frequencies of power semiconductors of the drive machine, which is provided for feeding a damping torque by means of said auxiliary drive (16) on the drive train (10) wherein the damping torque has the same frequency and the opposite phase relative to the rotational speed of the disturbing torsional oscillation.
    [5]
    5. The system of claim 4, wherein said monitoring means comprises monitoring parameters of a powertrain transfer function, wherein the transfer function is preferably updateable during preprogrammed maintenance time periods.
    [6]
    A system according to claim 4, wherein at least one sensor for monitoring torsional oscillation is provided, which sensor provides feedback to said controlled drive (19), said controlled drive using said feedback to apply said damping torque.
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    同族专利:
    公开号 | 公开日
    CH703555A2|2012-02-15|
    IL207481A|2014-07-31|
    DE102011109803A1|2012-02-09|
    IL207481D0|2010-12-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1634368B1|2003-06-13|2008-05-14|Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V.|Method and damping device for damping a torsional vibration in a rotating drivetrain|
    法律状态:
    2017-03-31| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    IL207481A|IL207481A|2010-08-09|2010-08-09|Method and system for damping torsional oscillation in a rotating drive train|
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