JP4001099B2 - Distributed power supply vibration diagnosis system - Google Patents

Description

  The present invention relates to a diagnostic system for diagnosing vibrations of a distributed power supply that is distributed in the vicinity of an electric user.

  An example of a conventional vibration abnormality diagnosis apparatus is described in Patent Document 1. As specifically shown in FIG. 1 of this publication, a vibration process measuring instrument measures vibration data in an abnormality diagnosis apparatus. Based on the vibration data measured by the vibration process measuring instrument, the vibration abnormality detection determination value storage means stores a vibration abnormality determination criterion. The vibration abnormality determination means determines vibration abnormality by comparing the vibration abnormality detection determination value stored in the vibration abnormality detection determination value storage means with the vibration data measured by the vibration process measuring instrument. The diagnosis result display output means displays the determination result of the vibration abnormality determination means. Non-Patent Document 1 describes a method of diagnosing device vibration. If the vibration symptom matrix described in Table 3 of this document is used, the cause of abnormal vibration can be specified from the increase / decrease of the amplitude accompanying the vibration frequency, vibration direction, vibration part, and rotational speed change.

Japanese Patent Laid-Open No. 2001-324380

Kimura, Yamauchi, “Vibration Sign Matrix”, Turbomachinery, Turbomachinery Association, 1982, Vol. 10, No. 10, p50

  Since the vibration abnormality diagnosis apparatus described in Patent Document 1 is intended for a wide range of general equipment, it is insufficient for application to a distributed power source having a micro turbine or a gas engine. In other words, unlike large power generation facilities for electric power companies and factories, users of distributed power sources cannot always spend sufficient time, expenses and personnel for operation, monitoring, maintenance and inspection. Therefore, an automatic operation system that adjusts the output of each device that makes up the distributed power supply in a simple manner, and automatically monitors and inspects the health of the device, and automatically determines the cause if an abnormality occurs in the device. Therefore, there is a need for a system that communicates to maintenance workers.

  If the vibration symptom matrix described in Non-Patent Document 1 is used, the cause of abnormal vibration of the device can be identified from the increase or decrease of the amplitude of the measurement site, but maintenance is required to change the operating conditions such as the rotation speed of the device. An operator is required, and determination of an operation condition requires judgment of an expert. For this reason, there is a limit to automatically specifying the cause of vibration.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to easily and accurately estimate the cause of vibration of a distributed power source.

  A feature of the present invention that achieves the above object is a distributed power supply vibration diagnostic system for diagnosing abnormalities in a distributed power supply by measuring vibrations of the equipment constituting the distributed power supply, and a vibration measuring means for measuring the vibration of the equipment, A determination unit that determines a vibration abnormality by comparing a measurement signal measured by the vibration measurement unit with a predetermined reference value, and a test operation condition determination that automatically determines a test operation condition based on a determination result of the determination unit Means and automatic operation means for automatically operating the distributed power source under the determined test operation condition, and the determination means determines vibration abnormality based on a change in vibration state when the operation condition is changed. .

  And in this feature, it has a determination means and a test operation condition determination means, has a remote monitoring system arranged remotely from the equipment, and transfers data between the remote monitoring system and the equipment of the distributed power source. Data transfer means may be provided, and display means for displaying when a vibration abnormality occurs in the device may be provided in the remote monitoring system.

  Further, the device is a gas turbine or a gas engine having a rotating body, a phase reference signal measuring means for measuring a phase reference signal of the rotating body, and a vibration state calculating means for calculating a vibration state from the signal measured by the measuring means; The vibration state calculation means has a frequency component that is an integral multiple of a rotation frequency or a fraction of an integer of the rotation frequency obtained from the phase reference signal measured by the phase reference signal measurement means for the vibration signal measured by the measurement means. And the phase difference between the phase reference signal and the operating conditions determined by the test operating condition determining means are the rotational speed and output of the gas turbine or the gas engine, the flow rate of the working gas, and so on. It may be at least one of a fuel flow rate, a lubricating fluid flow rate, and a cooling fluid flow rate.

  According to the present invention, since the test operation condition determining means and the automatic operation means are provided in the distributed power supply vibration diagnosis system, it is possible to measure the vibration state change by changing the operation conditions of each device constituting the distributed power supply. As a result, it is possible to easily and accurately specify the cause of vibration that cannot be specified by steady-state vibration measurement.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a distributed power supply vibration diagnosis system according to the present invention. In a distributed power supply system, distributed power supplies having a plurality of power generation devices such as micro turbines and gas engines are distributed and arranged in various places. FIG. 1 focuses on one of these dispersedly arranged power supplies 14, and the power generation device is a micro gas turbine. A vibration measuring means 1 is attached to the micro gas turbine, and the vibration of the distributed power source 14 is measured to generate a vibration signal. The vibration measuring means 1 is, for example, an eddy current displacement meter. The measurement signal of the vibration measuring means 1 is transmitted to the vibration signal capturing means 2 provided in the distributed power source 14.

  An eddy current displacement meter for measuring a phase reference signal is attached as the measuring means 3 so as to face the key groove of the rotor of the micro gas turbine. A phase reference signal is created from the rotational phase reference of the rotor measured by this measuring means and output to the phase reference signal capturing means 4. The vibration signal acquired by the vibration signal acquisition means 2 and the phase reference signal acquired by the phase reference signal acquisition means 4 are input to the data transfer means 5 and provided at a location remote from the data transfer means 5 from the distributed power source 14. To the remote monitoring system 13. As the data transfer means 5, a telephone line, an Internet line, a mobile phone line, or the like is used.

  In the remote monitoring system 13, the vibration state calculation unit 6 calculates the vibration state of the micro gas turbine based on the acquired vibration signal and phase reference signal, and stores the calculated result in the vibration state storage unit 7. The vibration state calculated by the vibration state calculation means 6 includes the vibration amplitude and frequency spectrum, the rotational speed component of the phase reference signal, the rotational speed component of the vibration, the integral multiple component of the rotational speed, and the integral component of the rotational speed. Such as phase difference.

  The vibration abnormality determination condition storage unit 8 included in the remote monitoring system 13 includes vibration amplitude, a frequency spectrum, a rotational frequency component of a phase reference signal, and a rotational frequency component of vibration in order to determine whether the operation of the microturbine is normal or abnormal. Basic data of the vibration state such as a phase difference from an integral multiple component of the rotational speed and a component of an integral part of the rotational speed is stored. The data relating to these vibration states are compared with the data measured by the vibration measuring means 1 and the vibration abnormality determining means 9 to estimate the cause of vibration.

  An example of determination conditions used for determining whether the vibration generated in the micro gas turbine is normal or abnormal is shown in FIG. In order to determine whether or not the vibration generated by the operation of the gas turbine is abnormal, the relationship between the cause of vibration such as unbalance and the vibration state such as vibration frequency is obtained, and the occurrence probability is tabulated. Probability of occurrence of unbalance, which is a mass imbalance in a rotating system, non-linear vibration due to play due to tolerances for assembly, oil whip of unstable vibration generated by lubricating oil used for bearings, and other causes of vibration Calculate the sum of The larger this sum is, the more likely it is to cause vibration. For example, in rated operation, if the rotational speed component changes significantly from the reference value, it is determined that the cause of the vibration is almost certainly caused by the rotor imbalance. Similarly, if the 1/2 rotation speed component is increased, it is determined that the vibration is non-linear, and if the natural frequency component is increased, it is determined that it is caused by the oil whip of the bearing. The cause of vibration estimated by the vibration abnormality determining means 9 is displayed on the vibration abnormality display means 10.

If an attempt is made to make an abnormality determination using only the vibration abnormality determination table during steady operation shown in FIG. 2, there are cases where there are a plurality of vibration causes with a high probability of occurrence and the vibration cause cannot be completely specified. . For example, it is assumed that the 50 Hz component in the rotor vibration measured by the vibration measuring unit 1 becomes large when the rotor having the natural frequency of 50 Hz rotates at the rotation speed of 100 s ⁻¹ . In this case, the frequency component increases and the frequency component that is 1/2 of the rotational speed also increases. Therefore, the probability of occurrence of non-linear vibration due to play and oil whip in the slide bearing is approximately the same. is there. Nonlinear vibration and oil whip are estimated as the cause of vibration.

  FIG. 3 shows another example of vibration abnormality determination conditions during transient operation used to determine vibration abnormality. This is a determination condition when the rotational speed is lowered. As the operating conditions change, the vibration state also changes. Even if the operating rotational speed decreases, if the operating rotational speed component is significant, there is a high probability that the nonlinear speed due to unbalance or backlash is the cause of vibration. If the specific frequency component (constant frequency) of the vibration is significant even when the operating rotational speed is reduced, the cause of the vibration is determined to be an oil whip.

  Since it is known from FIGS. 2 and 3 that the cause of vibration is emphasized when the rotational speed is changed, the test operation condition determining means 11 is provided in the remote monitoring device 13. At the same time, the distributed power source 14 is provided with automatic operation means 12 for operating the distributed power source 14 based on the command of the test operation condition determining means 11. The command of the test operation condition determination means 11 is sent to the automatic operation means 12 via the data transfer means 5. The test operation condition determining means 11 determines a test mode suitable for specifying the cause of vibration using the determination condition table of FIG. 3 from the assumed cause of vibration. In the case of vibration with a large 50 Hz component, a test operation is performed by automatically changing the rotation speed by a predetermined width. If the flow rate of the lubricating oil is changed by an amount that does not interfere with the power generation operation, a test operation can be performed during the power generation operation. If it is necessary to change the rotation speed significantly and the power generation operation is hindered, test operation is performed at night when power consumption is low.

  During the test operation, the data transfer means 5 transfers the vibration signal and the phase reference signal to the remote monitoring system 13. Then, the vibration state calculated by the vibration state calculation unit 6 is stored in the vibration state storage unit 7. The vibration abnormality determination means 9 determines the cause of vibration from the vibration states for a plurality of operating conditions stored in the vibration state storage means 7 and the vibration states stored in the vibration abnormality determination condition storage means 8, and the result is displayed on the vibration abnormality display means 10. Is output.

  FIG. 4 is a block diagram showing another embodiment of the distributed power supply vibration diagnosis system according to the present invention. In the present embodiment, the vibration state calculation means 6 is provided in the distributed power source 14. The data transfer means 5 does not need to transfer a large capacity vibration signal. As a result, it is only necessary to transfer a small-capacity vibration state calculation result, so that the time required for data transfer or the transfer capability can be reduced, and the communication cost can be reduced.

  FIG. 5 is a block diagram showing still another embodiment of the distributed power supply vibration diagnosis system according to the present invention. The present embodiment is different from the above embodiments in that the process up to the vibration abnormality determination is executed on the distributed power source 14 side. That is, the distributed power source 14 further includes a vibration state storage unit 7, a vibration abnormality determination condition storage unit 8, a vibration abnormality determination unit 9, and a test operation condition determination unit 11. The data transfer means 5 need only transfer the vibration abnormality determination result. The configuration of equipment required for transfer can be simplified, and the transfer capacity can be greatly reduced, so that the cost required for transfer can be reduced.

  As in this embodiment, the distributed power source 14 is provided with the vibration abnormality determining means 9 and the test operation condition determining means 11, and the remote monitoring system 13 is provided with the means after the vibration state calculating means 6. May be. In this way, the normal data transfer amount is extremely reduced, and vibration data can be directly sucked from the remote monitoring system 13 in the event of an abnormality, so that maintainability is improved.

  In addition to the rotational speed, at least one of the device output, the working fluid flow rate, the fuel flow rate, the lubricating oil flow rate, and the cooling fluid flow rate can be used as the operating condition changed by the test operation. When these various quantities are used, a judgment table as shown in FIG. 2 or FIG. 3 is created in advance in the same manner as when the rotational speed is used, and a gas turbine or a gas engine according to the operation mode derived from the judgment table. It is desirable to drive.

It is a block diagram of one Example of the distributed power supply vibration diagnostic system which concerns on this invention. It is a figure explaining the vibration abnormality determination conditions at the time of steady operation. It is a figure explaining the vibration abnormality determination conditions at the time of transient operation. It is a block diagram of the other Example of the distributed power supply vibration diagnostic system which concerns on this invention. It is a block diagram of further another embodiment of the distributed power supply vibration diagnosis system according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Vibration measuring means, 2 ... Vibration signal taking means, 3 ... Phase reference signal measuring means, 4 ... Phase reference signal taking means, 5 ... Data transfer means, 6 ... Vibration state calculation means, 7 ... Vibration state memory means 8 ... Vibration abnormality determination condition storage means, 9 ... Vibration abnormality determination means, 10 ... Vibration abnormality display means, 11 ... Test operation condition determination means, 12 ... Automatic operation means, 13 ... Remote monitoring system, 14 ... Distributed power supply.

Claims (5)

  A distributed power source vibration diagnosis system that measures vibrations of devices constituting a distributed power source and diagnoses an abnormality of the distributed power source. The vibration measuring unit that measures the vibrations of the device and the measurement signal measured by the vibration measuring unit Determining means for determining vibration abnormality in comparison with a set reference value, test operating condition determining means for automatically determining test operating conditions based on the determination result of the determining means, and dispersion according to the determined test operating conditions A distributed power source vibration diagnosis system comprising: automatic driving means for automatically driving a power supply, wherein the determination means determines a vibration abnormality based on a vibration state change when an operation condition is changed.   Data transfer having the determination means and the test operation condition determination means, having a remote monitoring system arranged remotely from the equipment, and transferring data between the remote monitoring system and the equipment of the distributed power source The distributed power supply vibration diagnosis system according to claim 1, further comprising means.   3. The distributed power supply vibration diagnosis system according to claim 2, wherein display means for displaying when vibration abnormality occurs in the device is provided in the remote monitoring system.   The apparatus is a gas turbine or a gas engine having a rotating body, phase reference signal measuring means for measuring a phase reference signal of the rotating body, and vibration state calculating means for calculating a vibration state from the signal measured by the measuring means; The vibration state calculation means has an integral multiple of the rotation frequency obtained from the phase reference signal measured by the phase reference signal measurement means or an integral fraction of the rotation frequency for the vibration signal measured by the measurement means. The distributed power supply vibration diagnosis system according to claim 1, wherein an amplitude of a frequency component and a phase difference between the phase reference signal are calculated. The operating condition determined by the test operating condition determining means is at least one of the rotational speed, output, working gas flow rate, fuel flow rate, lubricating fluid flow rate, and cooling fluid flow rate of the gas turbine or gas engine. The distributed power supply vibration diagnosis system according to claim 4, wherein

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