Method, system and equipment for judging running state of silicon controlled rectifier of excitation system and medium

Abstract

The invention discloses an excitation system silicon controlled rectifier running state judgment method, system and device and a medium. The method comprises the steps that the temperature of a silicon controlled rectifier radiator in a rectifier cabinet and running parameters of an excitation system are obtained; normalizing the temperature of the silicon controlled radiator in the rectifier cabinet and the operation parameters of the excitation system according to the rated operation parameters of the excitation system and the temperature of the silicon controlled radiator during operation under the rated working condition; performing correlation analysis according to the normalized temperature of the silicon controlled rectifier radiator and the operation parameters of the excitation system to obtain a correlation coefficient, and judging the health level of the silicon controlled rectifier according to the correlation coefficient; according to the method, the system, the equipment and the medium, the operation state of the silicon controlled rectifier can be monitored more accurately.

Description

Technical Field

[0001] The invention belongs to the field of generator excitation system monitoring, and relates to a method, system, equipment and medium for judging the operating state of a thyristor in an excitation system. Background Art

[0002] The generator excitation system is an important part of the generator set. Its main function is to provide the generator with DC excitation current to generate a magnetic field so that the generator can generate electricity normally. In this process, thyristors play a vital role. Thyristors are semiconductor devices with unidirectional conductivity, that is, they only allow current to flow in one direction. In the excitation system, thyristors are mainly used to adjust the magnitude of the excitation current, thereby achieving the regulation of the output voltage of the generator. However, the operating state of the thyristor directly affects the operating stability of the excitation system. If the thyristor does not work properly, it may cause the excitation current to be too large or too small, which in turn affects the output voltage of the generator and may even cause the generator to fail to work properly. Therefore, real-time monitoring of the operating state of the thyristor is of great significance to ensure the stable operation of the excitation system and improve the working efficiency and power quality of the generator.

[0003] Traditional methods for monitoring the operating status of thyristors include monitoring the voltage, current and temperature of thyristors. These methods all make a single judgment on their electrical information or non-electrical information. However, during the operation of the excitation system, the operating temperature of the thyristor changes with the change of the load, so it is not rigorous to judge its operating status based on a single piece of information. Moreover, the current monitoring of the thyristor temperature is carried out indirectly through the wind temperature. Since the wind temperature includes the temperature of other components in the rectifier cabinet, this method is not accurate enough. In order to ensure the stable operation of the generator excitation system, it is required to accurately monitor the operating status of the thyristor in the rectifier cabinet. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method, system, device and medium for judging the operating status of thyristors in an excitation system. The method, system, device and medium can more accurately monitor the operating status of thyristors.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] In one aspect, the present invention provides a method for determining the operating state of a thyristor in an excitation system, comprising:

[0007] Obtain the temperature of the thyristor heat sink in the rectifier cabinet and the operating parameters of the excitation system;

[0008] Normalizing the temperature of the thyristor radiator in the rectifier cabinet and the operating parameters of the excitation system according to the rated operating parameters of the excitation system and the temperature of the thyristor radiator when the thyristor is running under rated conditions;

[0009] Performing a correlation analysis based on the normalized temperature of the thyristor heat sink and the operating parameters of the excitation system to obtain a correlation coefficient, and judging the health level of the thyristor based on the correlation coefficient;

[0010] The operating status of the thyristor is determined based on the health level of the thyristor.

[0011] The method for determining the operating state of the thyristor in the excitation system of the present invention is further improved in that:

[0012] The operating parameter of the excitation system is the excitation current of the excitation system or the real-time power of the generator.

[0013] The health grades of the thyristors include Grade I, Grade II, Grade III and Grade IV.

[0014] When the correlation coefficient is at level I or II, the thyristor is judged to be in normal operation;

[0015] When the correlation coefficient is in the level III area, an alarm signal is issued and the operating status of the thyristor continues to be monitored. When the correlation coefficient is still in the level III area after N consecutive measurement points, the thyristor is judged to be in an abnormal operating state;

[0016] When the correlation coefficient is in the IV level area, it is determined that the thyristor is in an abnormal operating state.

[0017] In a second aspect of the present invention, the present invention provides a system for determining the operating state of a thyristor in an excitation system, comprising:

[0018] The acquisition module is used to obtain the temperature of the thyristor heat sink in the rectifier cabinet and the operating parameters of the excitation system;

[0019] A calculation module is used to normalize the temperature of the thyristor radiator in the rectifier cabinet and the operating parameters of the excitation system according to the rated operating parameters of the excitation system and the temperature of the thyristor radiator when the rated operating conditions are in operation, perform a correlation analysis based on the normalized temperature of the thyristor radiator and the operating parameters of the excitation system to obtain a correlation coefficient, and determine the health level of the thyristor according to the correlation coefficient;

[0020] The monitoring module is used to determine the operating status of the thyristor according to the health level of the thyristor.

[0021] The excitation system thyristor operation state judgment system of the present invention is further improved in that:

[0022] The operating parameter of the excitation system is the excitation current of the excitation system or the real-time power of the generator.

[0023] The health grades of the thyristors include Grade I, Grade II, Grade III and Grade IV.

[0024] When the correlation coefficient is at level I or II, the thyristor is judged to be in normal operation;

[0025] When the correlation coefficient is in the level III area, an alarm signal is issued and the operating status of the thyristor continues to be monitored. When the correlation coefficient is still in the level III area after N consecutive measurement points, the thyristor is judged to be in an abnormal operating state;

[0026] When the correlation coefficient is in the IV level area, it is determined that the thyristor is in an abnormal operating state.

[0027] In a third aspect of the present invention, the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the method for determining the operating status of the thyristor in the excitation system when executing the computer program.

[0028] In a fourth aspect of the present invention, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for determining the operating status of the thyristor in the excitation system are implemented.

[0029] The present invention has the following beneficial effects:

[0030] The method, system, device and medium for judging the operating status of the thyristor in the excitation system described in the present invention calculate the correlation coefficient based on the temperature of the thyristor radiator in the rectifier cabinet and the operating parameters of the excitation system during specific operation, and judge the health level of the thyristor according to the correlation coefficient, and judge the health status of the thyristor based on this, so as to avoid misjudgment of its operating status by single information and ensure the accuracy of monitoring the operating status of the thyristor. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 is a flow chart of the method of the present invention;

[0033] Figure 2 is a system structure diagram of the present invention;

[0034] Figure 3 It is a block diagram of the acquisition module in the present invention;

[0035] Figure 4 It is a device block diagram of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0038] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0039] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0040] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0041] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0044] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0045] Embodiment 1

[0046] refer to Figure 1 The method for determining the operating state of the thyristor in the excitation system of the present invention comprises the following steps:

[0047] 1) Obtain the temperature of the thyristor radiator in each rectifier cabinet and the associated characteristic parameters of the generator operation;

[0048] In step 1), the temperature of the thyristor radiator in each rectifier cabinet can be collected by a non-invasive temperature measurement device installed on the thyristor radiator, and the temperature measurement device has a digital output function. The generator operation-related characteristic parameters are obtained by communicating with the excitation system regulator, and the communication method adopts any communication method supported by the excitation regulator.

[0049] In step 1), the acquired temperature and related characteristic parameters of the thyristor heat sink in each rectifier cabinet are sent to the monitoring device in the excitation room.

[0050] Step 2) According to formula (1), the temperature of the thyristor radiator in each rectifier cabinet obtained in step 1) and the generator operation-related characteristic parameters are normalized according to the rated excitation current (generator rated power) and the thyristor temperature of the rectifier cabinet when the generator is running at rated conditions;

[0051]

[0052] Where, I and T are the normalized excitation current and temperature, i is the current measured excitation current, t is the current thyristor temperature, I e is the rated excitation current, T p It is the temperature of the thyristor when the generator is operating at rated conditions.

[0053] 3) Calculate the correlation coefficient based on the normalized data, and classify the health level of the thyristor operating status based on the correlation coefficient.

[0054] In step 3), the correlation health level is divided into four levels: level I, level II, level III, and level IV according to the correlation coefficient between the thyristor temperature and the excitation current of the excitation system and the excitation current differential value and the thyristor temperature differential value, as shown in Table 1.

[0055] Table 1

[0056]

[0057] In step 3), the normalized thyristor temperature and excitation current correlation coefficient is calculated by formula (2);

[0058]

[0059] Among them, n is the total number of data, I i is the i-th excitation current value, T i is the temperature value of the thyristor i, and r is the correlation coefficient under the current data sample.

[0060] In step 3), the correlation coefficient between the normalized thyristor temperature difference and the excitation current difference is calculated, specifically by formula (3):

[0061]

[0062] Among them, n is the total number of data, I Δi is the difference of the i-th excitation current value, T Δi is the temperature difference of the ith thyristor, r △ is the difference correlation coefficient. The specific difference is calculated by formula (4):

[0063]

[0064] In step 3), the selection of the total number of data n is related to the time of change of the thyristor operating state. Since the temperature change is not obvious in a short time, data is acquired every 5 seconds and a judgment is made every 5 minutes during data collection. Therefore, the total number of data n is 60.

[0065] 4) Based on the thyristor operating status health level classification result obtained in step 3), determine the thyristor operating status.

[0066] In step 4), based on the correlation coefficient calculated in step 3), determine the area of ​​the health level. Specifically, when the correlation coefficient is in the level I or II area, the thyristor is determined to be in a normal operating state; when the correlation coefficient is in the level III area, an alarm signal can be issued to continue monitoring its operating state. When each correlation coefficient is still in the level III area after N consecutive measurement points, the thyristor is determined to be in an abnormal operating state; when the correlation coefficient is in the level IV area, the thyristor is directly determined to be in an abnormal operating state.

[0067] In step 4), when the correlation coefficient is in the level III region, it is necessary to continue to monitor the operating status of N consecutive measuring points, where N is 90 measuring points, or 7.5 minutes.

[0068] Embodiment 2

[0069] The following are system embodiments of the present disclosure, which can be used to execute the method embodiments of the present disclosure. For details not disclosed in the system embodiments of the present disclosure, please refer to the method embodiments of the present disclosure.

[0070] refer to Figure 2 and Figure 3 , Figure 2 A block diagram of the thyristor operating status judgment system of the excitation system provided in this embodiment. Figure 3 This is a block diagram of the acquisition module provided in this embodiment. The excitation system thyristor operation state judgment system can be implemented by combining software and hardware.

[0071] The excitation system thyristor operation state judgment system 10 of the present invention comprises a collection module 11, a calculation module 12 and a judgment module 13, wherein:

[0072] The acquisition module 11 is used to obtain the temperature of the thyristor heat sink in the rectifier cabinet and the operating parameters of the excitation system;

[0073] The calculation module 12 is used to normalize the temperature of the thyristor radiator in the rectifier cabinet and the operating parameters of the excitation system according to the rated operating parameters of the excitation system and the temperature of the thyristor radiator when the rated operating conditions are in operation, perform a correlation analysis based on the normalized temperature of the thyristor radiator and the operating parameters of the excitation system to obtain a correlation coefficient, and determine the health level of the thyristor according to the correlation coefficient;

[0074] The monitoring module 13 is used to determine the operating state of the thyristor according to the health level of the thyristor.

[0075] Optionally, the temperature measurement unit is a non-invasive temperature measurement device with a digital output function.

[0076] Optionally, the calculation module 12 and the judgment module 13 may be integrated into a thyristor operation state judgment device of the excitation system in the excitation chamber.

[0077] The serial numbers of the above-mentioned embodiments of the present disclosure are only for description and do not represent the advantages or disadvantages of the embodiments.

[0078] As an embodiment of the present invention, the health level of the thyristor includes level I, level II, level III and level IV.

[0079] As an implementation mode of the present invention, when the correlation coefficient is at level I or level II, it is determined that the thyristor is in a normal operating state;

[0080] When the correlation coefficient is in the level III area, an alarm signal is issued and the operating status of the thyristor continues to be monitored. When the correlation coefficient is still in the level III area after N consecutive measuring points, the thyristor is judged to be in an abnormal operating state; when the correlation coefficient is in the level IV area, the thyristor is judged to be in an abnormal operating state.

[0081] Embodiment 3

[0082] According to an embodiment of the present disclosure, the present disclosure also provides a device for determining the operating state of a thyristor in an excitation system, a readable storage medium, and a computer program product.

[0083] Figure 4 The block diagram of the excitation system thyristor operation state judgment device used to implement the excitation system thyristor operation state judgment method of the embodiment of the present disclosure. The excitation system thyristor operation state judgment device is intended to represent various forms of digital computers. The components, connections and relationships of the components, and functions of the components shown in the present disclosure are only examples and are not intended to limit the implementation of the present disclosure described and / or required in the present disclosure.

[0084] like Figure 4 As shown, the generator excitation system power cabinet state monitoring device 30 includes a computing unit 31, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 32 or a computer program loaded from a storage unit 28 to a random access memory (RAM) 33. In the RAM 33, various programs and data required for the operation of the excitation system thyristor operating state judgment device 30 can also be stored. The computing unit 31, the ROM 32, and the RAM 33 are connected to each other through a bus 37.

[0085] Multiple components in the excitation system thyristor operating state judgment device 30 are connected to the bus 37, including: an input unit 34, an output unit 35, and a communication unit 36. The communication unit 36 ​​allows the excitation system thyristor operating state judgment device 30 to exchange information / data with other generator excitation system power cabinet state monitoring devices through a computer network such as the Internet and / or various telecommunication networks. The computing unit 31 can be various general and / or special processing components with processing and computing capabilities. In some embodiments, the excitation system thyristor operating state judgment method can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as a storage unit 32.

[0086] For interaction with a user, a computer has a display device for displaying information to the user, and a keyboard and mouse for providing input to the computer.

[0087] Program codes for implementing the methods of the present disclosure may be written in any combination of one and / or multiple programming languages.

[0088] Various implementations of the systems and techniques described above in this disclosure can be realized in digital electronic circuitry, integrated circuitry, computer hardware, firmware, software, and / or combinations of them.

[0089] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this disclosure can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions disclosed in this disclosure can be achieved, and this disclosure is not limited here.

[0090] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0091] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0092] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for judging the operating state of a thyristor in an excitation system, characterized in that: include: Obtain the temperature of the thyristor heat sink in the rectifier cabinet and the operating parameters of the excitation system; Normalizing the temperature of the thyristor radiator in the rectifier cabinet and the operating parameters of the excitation system according to the rated operating parameters of the excitation system and the temperature of the thyristor radiator when the thyristor is running under rated conditions; Performing a correlation analysis based on the normalized temperature of the thyristor heat sink and the operating parameters of the excitation system to obtain a correlation coefficient, and judging the health level of the thyristor based on the correlation coefficient; The operating status of the thyristor is determined based on the health level of the thyristor.

2. The method for judging the operating state of the thyristor in the excitation system according to claim 1, characterized in that: The operating parameter of the excitation system is the excitation current of the excitation system or the real-time power of the generator.

3. The method for determining the operating state of a thyristor in an excitation system according to claim 1, characterized in that: The health grades of the thyristors include Grade I, Grade II, Grade III and Grade IV.

4. The method for determining the operating state of a thyristor in an excitation system according to claim 1, characterized in that: When the correlation coefficient is at level I or II, the thyristor is judged to be in normal operation; When the correlation coefficient is in the level III area, an alarm signal is issued and the operating status of the thyristor continues to be monitored. When the correlation coefficient is still in the level III area after N consecutive measurement points, the thyristor is judged to be in an abnormal operating state; When the correlation coefficient is in the IV level area, it is determined that the thyristor is in an abnormal operating state.

5. A system for judging the operating status of a thyristor in an excitation system, characterized in that: include: A collection module (11) is used to obtain the temperature of the thyristor heat sink in the rectifier cabinet and the operating parameters of the excitation system; A calculation module (12) is used to normalize the temperature of the thyristor radiator in the rectifier cabinet and the operating parameters of the excitation system according to the rated operating parameters of the excitation system and the temperature of the thyristor radiator when the excitation system is running under rated conditions, perform a correlation analysis based on the normalized temperature of the thyristor radiator and the operating parameters of the excitation system to obtain a correlation coefficient, and determine the health level of the thyristor according to the correlation coefficient; The monitoring module (13) is used to determine the operating state of the thyristor according to the health level of the thyristor.

6. The excitation system thyristor operation status judgment system according to claim 5, characterized in that: The operating parameter of the excitation system is the excitation current of the excitation system or the real-time power of the generator.

7. The excitation system thyristor operation state judgment system according to claim 5, characterized in that: The health grades of the thyristors include Grade I, Grade II, Grade III and Grade IV.

8. The excitation system thyristor operation state judgment system according to claim 5, characterized in that: When the correlation coefficient is at level I or II, the thyristor is judged to be in normal operation; When the correlation coefficient is in the level III area, an alarm signal is issued and the operating status of the thyristor continues to be monitored. When the correlation coefficient is still in the level III area after N consecutive measurement points, the thyristor is judged to be in an abnormal operating state; When the correlation coefficient is in the IV level area, it is determined that the thyristor is in an abnormal operating state.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for determining the operating status of a thyristor in an excitation system as described in any one of claims 1 to 4 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by the processor, the steps of the method for determining the operating status of the thyristor in the excitation system as described in any one of claims 1 to 4 are implemented.

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