JP2006141088A - Supervisory system and method of plant drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a supervisory system of plant drive in which failure analysis can be carried out while associating a plurality of power converters. <P>SOLUTION: The supervisory system of plant drive comprises a plurality of power converters 1 each having a means for storing supervisory trend data, a process controller 6 for monitoring them, and a network device 9 performing communication between the process controller and the power converters wherein each power converter stores its trend data by its failure signal. Upon receiving a failure signal from one of the power converters, the process controller 6 collects trend data of that power converter, receives trend data from other predetermined peripheral power converter by transmitting a trend data storage command thereto, and edits trend data of the relevant power converter and the peripheral power converter thus collected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plant drive monitoring system and a monitoring method including a plurality of power conversion devices and a process controller for monitoring them.

  Among the electric equipment used in the plant, the power converter for driving the electric motor uses each reference signal corresponding to the command and the output feedback signal corresponding to the actual data as trend data in order to grasp the failure analysis or the operation status of the equipment. It has a function to save. Since data before the occurrence of a failure is also required, data for a predetermined time is always stored.

  When an equipment failure occurs or when there is a request for grasping the operation status, data immediately before and after receiving a failure signal or trend data storage command signal is saved and played back as trend data, and the failure is analyzed based on this Was. This trend data is read and used by other tools such as a process controller or a personal computer via a network.

  For example, trend data storage / reproduction at the time of failure in a monitoring system for a conventional power conversion device used in an iron or paper plant is performed as follows.

  The power conversion device includes a power conversion unit that converts AC or DC power of a common power source into AC of an arbitrary voltage and frequency, and a control circuit that controls the power conversion unit. This control circuit normally receives an external command from a process controller located at the upper level of the system and controls the motor speed or torque to a desired value. In this control, signals such as the motor voltage, current, and speed are used as feedback signals.

In addition, the power conversion device is provided with a trend data storage / reproduction function. The time-temporary data is stored. When a failure occurs or when there is a trend data storage request for confirming the operation status of the apparatus at an arbitrary timing, the temporary history data in the internal memory is stored as trend data, and the plant monitoring apparatus These trend data are provided by transmitting them to a process controller or other tool that corresponds to the process controller (see, for example, Non-Patent Document 1).
Nakamura, Abe, Miyazaki “Plant drive device with advanced intelligent technology”, Toshiba Review Vol55No7, July 1, 2000, P29

  In a conventional system to which a plurality of power conversion devices such as those described in Non-Patent Document 1 are applied, each power conversion device responds to its own failure independently of other power conversion devices. I saved and replayed my trend data.

  However, in plant drive systems such as steel and papermaking, the movement of adjacent power converters is closely entangled, and trend data of adjacent power converters before and after the occurrence of a failure is required for failure analysis. Is not uncommon.

  Even if failures occur in a chain and trend data of adjacent power converters is collected, the trend data of different power converters can be easily compared to identify the order of failure occurrence. Failure analysis is difficult because it does not have a function to perform.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a plant drive monitoring system and a monitoring method capable of performing failure analysis in association with a plurality of power converters. .

In order to achieve the above object, a plant drive monitoring apparatus according to the first aspect of the present invention comprises:
A plurality of AC motor drive power conversion devices each having means for storing monitoring trend data composed of a plurality of operation information, a process controller for controlling and monitoring the power conversion devices, the process controller, and the power conversion A network device that performs information communication between the devices, each of the power conversion devices, based on reception of its own failure signal or trend data storage request signal, trend data storage means for storing its own trend data; Trend data transmitting means for transmitting the stored trend data based on a transmission request from the process controller, wherein the process controller is connected to one of the plurality of power converters. When a failure signal or trend data storage request signal is received, The device trend data collecting means for collecting the trend data of the power converter, and the peripheral device for transmitting the trend data storage command to another predetermined peripheral power converter and receiving the trend data from the peripheral power converter Trend data collection means, and further comprises trend data editing means for editing the collected trend data of the power converter and the peripheral power converter.

  According to a second aspect of the present invention, there is provided a plant drive monitoring method comprising: a plurality of AC motor drive power converters each having a means for storing trend data comprising a plurality of operation information; and control of the power converters. And a process controller that performs monitoring, and a network device that performs information communication between the process controller and the power converter, and each of the power converters receives a failure signal or a trend data storage request signal. The stored trend data is transmitted on the basis of a transmission request from the process controller, and the process controller is one of the plurality of power conversion devices. When a failure signal or trend data storage request signal is received, the process The trawler collects trend data of the one power converter, and the process controller transmits a trend data storage command to another predetermined peripheral power converter and receives the trend data from the peripheral power converter. Further, the process controller is characterized in that the collected trend data of the power conversion device and the peripheral power conversion device is edited so as to be suitable for failure analysis or grasping of an operation state.

  ADVANTAGE OF THE INVENTION According to this invention, the monitoring apparatus and monitoring method of a plant drive which can perform a failure analysis by linking a plurality of power converters can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  A plant drive monitoring system and monitoring method according to a first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of a plant drive monitoring system according to the present invention.

  The power conversion device 1A drives an AC motor 2A by converting an AC or DC common power source into AC having an arbitrary voltage and frequency. Usually, a direct current power source obtained by converting a commercial alternating current power source into a direct current by a converter is used as a common power source. The power conversion device 1A includes a power conversion unit 3A constituting a main circuit for power conversion, a control circuit 4A for controlling the output voltage and frequency of the power conversion unit 3A, and a data management area 5A.

  The power conversion device 1B has the same configuration as the power conversion device 1A and drives the AC motor 2B. In FIG. 1, for the sake of simplicity, the system configuration includes two power conversion devices 1A and 1B. Usually, the system is configured by three or more devices.

  The process controller 6 monitors the power conversion devices 1A and 1B as a plant. The process controller 6 edits and displays an input / output interface 7, a trend data management area 8 for storing trend data, and trend data editing and display. A display unit 81 is provided.

  The data management area 5A of the power converter 1A receives each command such as an operation command, a speed command, and a torque command from the process controller 6 that monitors the plant as a sequence input via the input / output interface 7 and the network device 9, and converts the power. Gate control of a switching element (not shown) of the unit 3A is performed to control the speed or torque of the AC motor 2A. In order to perform this control, the control circuit 4A is supplied with a feedback signal from the speed detector S of the AC motor 2A, a voltage signal and a current signal of each part of the power converter 3A, and the like.

  The control circuit 4 </ b> A outputs a failure signal to the data management area 5 when detecting an abnormal value of a signal such as a feedback signal from the speed detector S or a voltage signal or a current signal from each part of the power converter 3 </ b> A.

  The data management area 5A includes an input / output unit 51A, a processor 52A, and a storage unit 53A. The input / output unit 51A performs processing for input / output of various signals with an external process controller 6 and a dedicated tool such as a personal computer (not shown). A signal for recording temporary history data is always input from the control circuit 4A, and is temporarily stored in the storage unit 53A as temporary history data. The temporary history data includes signals such as the speed feedback signal from the speed detector S, the current feedback signal from the power converter 3A, and the voltage feedback signal, and the sequence input signal from the process controller 6 described above. included.

  When the processor 52A in the data management area 5A detects the occurrence of a failure, the processor 52A starts saving temporary history data that has been temporarily saved as trend data as it is. The data management area 5A writes a signal informing that a failure has occurred in a predetermined bit or a predetermined word in the data structure of the sequence output, and transmits the signal to the process controller 6 via the network device 9. The process controller 6 sends a trend data storage start command to a predetermined peripheral power conversion device (in the case of FIG. 1, the power conversion device 1B) in association with the failure occurrence power conversion device, a predetermined bit of the data structure of the sequence input Alternatively, a predetermined word is written and notified via the network device 9. The peripheral power converter (power converter 1B in the case of FIG. 1) starts saving trend data based on the command. At this time, if the peripheral power conversion device (power conversion device 1B in the case of FIG. 1) has also failed in a chain, the storage of the trend data has already been started, so the above storage start command is ignored. Like that.

  If there is a request from the process controller 6 or other tools such as a personal computer (not shown), the trend data stored by the above operation is transmitted to the input / output interface 7 in the process controller 6 via the network device 9 and sent to the trend data management area 8 Saved in. In this way, it becomes possible to obtain trend data of the peripheral power converter (power converter 1B in the case of FIG. 1) including the fault power converter (power converter 1A in the case of FIG. 1). .

  All communication between the process controller 6 and each power conversion device 1 is performed via the network device 9.

  The process controller 6 that has acquired the trend data of the plurality of power conversion devices 1 edits the trend data with the editing / display unit 81 and displays the edited trend data. For example, if the editing is performed such that the trend data of the same part of different power conversion devices is arranged and displayed, the failure analysis of the plant becomes easy. An example of the trend data editing method will be described below with reference to FIG.

  FIG. 2 is an explanatory diagram showing an editing function of the editing / display unit 81. FIG. 2A shows data 1 to data 3 which are independent trend data of the devices A and B, respectively. Among these data, if the data 1 is common data, for example, data indicating a DC voltage of a common DC power supply, the data 1 is the same for the devices A and B. Therefore, if the data 1 is used so that the data of the devices A and B overlap as shown in FIG. 2B, the time axes of the data of the devices A and B can be matched. The common data may be a common command given simultaneously to the devices A and B in addition to the common DC voltage. If time is adjusted between apparatuses using common data in this way, data can be edited and displayed without exchanging time data between apparatuses or between the process controller 6 and the power conversion apparatus 1.

  Next, the detailed operation of the plant drive monitoring system to which the present invention is applied will be described with reference to FIG. FIG. 3 is a flowchart showing a series of monitoring operations of the plant drive monitoring system according to the first embodiment of the present invention.

  First, the processor 52 in the data management area 5 confirms whether a feedback signal that is a basis of temporary history data from the control circuit 4 is normally output via the input / output unit 51 (ST1). If no failure has occurred, the feedback signals and the command signals from the process controller 6 are read (ST2) and stored as temporary history data at regular intervals (ST3). If a failure has occurred, the failure signal is read and the temporary history data temporarily stored for each predetermined period is stored in the storage unit 53 as trend data (ST4). At substantially the same time, an occurrence signal is written in a predetermined bit or a predetermined word of the data structure of the sequence output to notify the occurrence of the failure, and the sequence output is transmitted to the process controller 6 (ST5). The process controller 6 that has received the sequence output including the transmitted failure signal determines whether or not to save the trend data at this time for the peripheral power conversion device (ST6), and the peripheral power conversion to store the data. If there is a device, a trend data storage start command included in the sequence input to be transmitted to those peripheral power conversion devices is written (ST7), and this is transmitted to the power conversion device (ST8).

  When the peripheral power converter receives the trend data storage start command, it first checks whether a failure has already occurred in its own power converter and the trend data storage operation has not started (ST9). In accordance with a command from the controller 6, the trend data storage is started (ST10). When data storage is completed and a trend data transmission command is received from the process controller 6 (ST11), this is transmitted to the process controller 6 (ST12), and a series of operations is completed.

  The trend data created by the processor 52 is not necessarily transmitted to the external process controller 6 or a dedicated tool. For example, the power conversion apparatus 1 may be configured to display the trend data.

  In addition, the trend data storage start command assigned to the sequence input from the process controller 6 may be used for the purpose of confirming the operation status as well as at the time of failure.

  As described above, according to the first embodiment of the present invention, the trend data storage start command is almost simultaneously sent from the process controller 6 to the peripheral power conversion device based on the failure information from the power conversion device 1 in which the failure has occurred. Is output and stored, it becomes possible to easily perform failure analysis from the regenerated trend data of a plurality of power converters.

  Note that these input / output sequences or various reference signals and interfaces such as feedback signals are stored in a memory accessible by the process controller 6 called the common memory area prepared in the process controller 6 or the network device 9 and all the power conversion devices 1. The input / output area of each device is set in the section, and the signal set in the determined area is read and written. As described above, any transmission method may be adopted as long as a device can be specified by a dedicated address without providing a common memory area and can be read and written.

  FIG. 4 is a block diagram of a plant drive monitoring system according to the second embodiment of the present invention.

  About each part of this Example 2, the same part as each part of the monitoring system of the plant drive which concerns on Example 1 of FIG. 1 is shown with the same code | symbol, and the description is abbreviate | omitted. The difference between the second embodiment and the first embodiment is that when a failure occurs in the power converter 1, it is directly transmitted to the sequence output information of the peripheral power converter via the network device 9 as a trend data storage start command. The direct communication route for saving the trend data in the peripheral power converter is added.

  FIG. 5 is a flowchart illustrating the monitoring operation of the plant drive monitoring system according to the second embodiment of the present invention. About each step of the flowchart which shows the monitoring operation | movement of this Example 2, the same step as each step of the flowchart which shows the monitoring operation | movement of Example 1 of FIG. 2 attaches | subjects the same code | symbol, and abbreviate | omits the description. The flowchart showing the monitoring operation of the second embodiment in FIG. 5 is different from the flowchart showing the monitoring operation of the first embodiment in FIG. 2 in place of the procedure for outputting the storage command to the peripheral device by the process controller in steps ST7 to ST8. Thus, a procedure for outputting a storage command to the peripheral device by the failed power conversion device itself in step 13 to step ST15 is provided, and whether or not a storage command to the peripheral device in step ST6 is necessary is determined not as a process controller. Thus, the power conversion apparatus itself performs the operation, and thus the sequence output of the failure data in step ST5 is omitted.

  According to the procedure of the second embodiment, the failure occurrence signal is written as a part of the sequence output to be passed to the process controller 6 in the first embodiment, but it is necessary to directly write a signal corresponding to the sequence input of the peripheral power converter. The other party address set in advance in the own device is read (ST13), and the trend data storage signal included in the other party's sequence input signal is written (ST14). And since it transmits to the related peripheral converter (ST15), it becomes the structure which can transmit a trend data preservation | save command not via the process controller 6. FIG.

  The writing of the input / output sequence relating to the trend data storage signal can be realized by reading and writing to the target power conversion device dedicated area in the common memory area prepared in the process controller 6 or the network device 9. . In addition, the present transmission method can be implemented regardless of the above as long as the device can be designated by a dedicated address.

The block block diagram of the monitoring system of the plant drive which concerns on Example 1 of this invention. Explanatory drawing of the trend data edit function of the monitoring system of the plant drive which concerns on this invention. The flowchart which shows a series of monitoring operation | movement of the monitoring system of the plant drive which concerns on Example 1 of this invention. The block block diagram of the monitoring system of the plant drive which concerns on Example 2 of this invention. The flowchart which shows a series of monitoring operation | movement of the monitoring system of the plant drive which concerns on Example 2 of this invention.

Explanation of symbols

1, 1A, 1B Power converter 2A, 2B AC motor 3A Power converter 4A Control circuit 5A Data management area 51A Input / output unit 52A Processor 53A Storage unit 6 Process controller 7 Input / output interface 8 Trend data management area 81 Editing / display unit 9 Network equipment

Claims (5)

A plurality of AC motor drive power converters each having means for storing monitoring trend data each consisting of a plurality of operation information;
A process controller for controlling and monitoring the power converter;
A network device that performs information communication between the process controller and the power converter,
Each of the power conversion devices, based on reception of its own failure signal or trend data storage request signal, trend data storage means for storing its own trend data,
Trend data transmitting means for transmitting the stored trend data based on a transmission request from the process controller,
The process controller is
The apparatus trend data collecting means for collecting the trend data of the one power converter when receiving a failure signal or a trend data storage request signal of one of the plurality of power converters; A peripheral device trend data collecting means for transmitting a trend data storage command to another predetermined peripheral power converter and receiving trend data from the peripheral power converter,
The plant drive monitoring device further comprises trend data editing means for editing the collected trend data of the power converter and the peripheral power converter. A plurality of AC motor driving power converters each having means for storing trend data composed of a plurality of operation information, and
A process controller for controlling and monitoring the power converter;
A network device that performs information communication between the process controller and the power converter,
Each of the power conversion devices is based on reception of its own failure signal or trend data storage request signal,
Trend data storage means for storing its own trend data, trend data transmission means for transmitting the stored trend data based on a transmission request from the process controller, and a trend to other predetermined peripheral power conversion devices Means for transmitting a data storage command,
The process controller is
The apparatus trend data collecting means for collecting trend data of the one power converter when receiving a failure signal or a trend data storage request signal of one of the plurality of power converters; Peripheral device trend data collecting means for collecting trend data of the other peripheral power conversion device determined in advance;
With
The plant drive monitoring device further comprises trend data editing means for editing the collected trend data of the power converter and the peripheral power converter. The trend data editing means includes
Among the collected trend data of the power conversion device and the peripheral power conversion device, it has time axis adjustment means for adjusting a time axis of trend data between different power conversion devices using common trend data. The plant drive monitoring device according to claim 1 or 2, characterized in that   The plant drive monitoring apparatus according to claim 3, wherein the common trend data is a DC voltage of a common power source. A plurality of AC motor driving power converters each having means for storing trend data composed of a plurality of operation information, and
A process controller for controlling and monitoring the power converter;
A network device that performs information communication between the process controller and the power converter,
Each of the power conversion devices stores its own trend data based on reception of its own failure signal or trend data storage request signal, and this stored trend data is transmitted based on a transmission request from the process controller. ,
When the process controller receives a failure signal or a trend data storage request signal of one of the plurality of power conversion devices,
The process controller collects trend data of the one power converter, sends a trend data storage command to another predetermined peripheral power converter, and receives the trend data from the peripheral power converter,
Further, the process controller is adapted to edit and display the collected trend data of the power conversion device and the peripheral power conversion device so as to be suitable for failure analysis or grasping of an operation state. Monitoring method.

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