Data communication control method and system for pumped storage power plant

Abstract

This invention relates to the field of power plant data acquisition and control technology, specifically to a data communication control method and system for pumped storage power plants. The invention first acquires temperature data at each preset measuring point on the excitation winding under different operating conditions. Then, combining the location distribution of the preset measuring points, it obtains the temperature distribution non-uniformity of each excitation winding under each operating condition, thereby screening out suspected short-circuit excitation windings. Next, it obtains the short-circuit coefficient of the suspected short-circuit excitation winding under each operating condition, assessing the communication necessity coefficient of generator short-circuit information at the current moment to control communication transmission. This invention combines the distribution of the excitation winding and the coil distribution on the excitation winding to analyze the temperature distribution of the excitation winding at different power generation stages, and then comprehensively assesses the temperature distribution of the excitation winding at all power generation stages to accurately evaluate its short-circuit fault probability and communication necessity. Through targeted communication transmission of fault-related information, it reduces communication burden while minimizing fault losses.

Description

Technical Field

[0001] This invention relates to the field of power plant data acquisition and control technology, specifically to a data communication control method and system for pumped storage power plants. Background Technology

[0002] Pumped-storage hydroelectric power stations, also known as pumped-storage hydroelectric power stations, use excess electricity to pump water to higher ground for storage when electricity demand is low. During peak demand periods, the stored water is released to drive turbine generators to generate electricity. They are a special type of power station used for energy storage and regulating grid load. The generator is a key piece of equipment in a pumped-storage hydroelectric power station, and its operating status directly affects the load balance of the power grid. Timely communication and transmission of generator operating data helps in the real-time assessment of generator fault conditions, enabling timely implementation of relevant measures to ensure the safe and stable operation of the power station and optimize its operating efficiency.

[0003] In existing technologies, to improve communication transmission efficiency, fault data is typically transmitted selectively, thereby reducing communication frequency and data volume, and lessening the communication burden. Therefore, the accuracy of generator fault information is crucial. Excitation winding short circuits are a common fault in generators. Short circuits can lead to winding overheating, accelerating coil aging, and even causing arcing that damages the winding and surrounding structures. Currently, short circuits are typically assessed based on the local temperature distribution of the excitation winding. However, the temperature change of the excitation winding is also affected by factors such as heat radiation or heat dissipation from surrounding excitation windings, resulting in low accuracy in analyzing short circuit faults in the excitation winding, which in turn affects the effectiveness of subsequent fault information communication. Summary of the Invention

[0004] To address the technical problem of ineffective fault information communication and control in existing technologies for pumped storage power plants, the present invention aims to provide a data communication and control method and system for pumped storage power plants. The specific technical solution adopted is as follows:

[0005] A data communication control method for a pumped storage power station, the method comprising:

[0006] Within a preset historical time period at the current moment, acquire temperature data of each preset measuring point on each excitation winding of the generator under different operating conditions; all preset measuring points on each excitation winding are distributed at equal intervals along the axial direction of the excitation winding, starting from the pole shoe side.

[0007] Under each operating condition, based on the dispersion of the temperature data at all preset measuring points on each excitation winding, and combined with the positional distribution of each preset measuring point, the temperature distribution non-uniformity of each excitation winding is obtained; by combining the temperature distribution non-uniformity of each excitation winding under all operating conditions, suspected short-circuit excitation windings are selected from all excitation windings.

[0008] Under each operating condition, based on the temperature distribution non-uniformity of the suspected short-circuit excitation winding, and combined with the temperature information and position distribution information of the other excitation windings, the short-circuit coefficient of the suspected short-circuit excitation winding is obtained; at the current moment, based on the short-circuit coefficient of the suspected short-circuit excitation winding under all operating conditions, and the temperature change of the suspected short-circuit excitation winding under different operating conditions, the communication necessity coefficient of the generator short-circuit information is obtained.

[0009] The fault data communication transmission of the pumped storage power station is controlled according to the aforementioned communication necessity coefficient.

[0010] Furthermore, the method for acquiring the temperature data includes:

[0011] Within a preset historical time period at the current moment, the power of the generator at each moment is acquired, and the power is constructed into a power sequence according to the acquisition order; the absolute values ​​of the difference values ​​in the first-order difference sequence of the power sequence are taken to construct a first-order absolute difference sequence; the absolute values ​​of the difference values ​​less than a preset threshold in the first-order absolute difference sequence are used as the sequence numbers of the segmentation points, and the power sequence is segmented using the segmentation points, with each segment corresponding to an acquisition time period as a time period corresponding to an operating condition;

[0012] Within each operating condition and corresponding time period, the average temperature of each preset measuring point on each excitation winding at all sampling times is taken as the temperature data.

[0013] Furthermore, the method for obtaining the temperature distribution non-uniformity includes:

[0014] Under each operating condition, the initial temperature distribution non-uniformity of each excitation winding is obtained based on the standard deviation and range of the temperature data at all preset measuring points on each excitation winding.

[0015] Under each operating condition, on each excitation winding, based on the temperature data and location of each preset measuring point, suspected short-circuit measuring points and thermal radiation reference measuring points are selected from all preset measuring points; and correction weights are obtained based on the spatial distance between the suspected short-circuit points and the reference measuring points.

[0016] The initial temperature distribution non-uniformity is weighted using the correction weights, and the normalized result of the weighted result is taken as the temperature distribution non-uniformity.

[0017] Furthermore, the method for obtaining the initial temperature distribution non-uniformity includes:

[0018] Under each operating condition, the normalized result of the standard deviation of the temperature data at all preset measuring points on each excitation winding is used as the first temperature distribution non-uniformity parameter for each excitation winding.

[0019] Under each operating condition, the range of the temperature data at all preset measuring points on each excitation winding is used as the second temperature distribution non-uniformity parameter for each excitation winding.

[0020] The product of the first temperature distribution non-uniformity parameter and the second temperature distribution non-uniformity parameter is used as the initial temperature distribution non-uniformity of the corresponding excitation winding.

[0021] Furthermore, the method for obtaining the suspected short-circuit point and the thermal radiation reference measurement point includes:

[0022] Among all the preset measurement points of each excitation winding, the preset measurement point with the smallest temperature data is taken as the suspected short circuit point of the excitation winding; among all the preset measurement points in the axial direction of the excitation winding, the preset measurement point located at the center is taken as the thermal radiation reference measurement point.

[0023] Furthermore, the method for obtaining the suspected short-circuit excitation winding includes:

[0024] Under each operating condition, the excitation winding with a temperature distribution non-uniformity greater than a preset threshold is selected as the initial screening suspected short-circuit excitation winding; among all the initial screening suspected short-circuit excitation windings under all operating conditions, the initial screening suspected short-circuit excitation winding with the highest frequency of occurrence is selected as the suspected short-circuit excitation winding.

[0025] Furthermore, the method for obtaining the short-circuit coefficient includes:

[0026] Based on the spatial distance between each excitation winding and the suspected short-circuit excitation winding, sort all excitation windings except the suspected short-circuit excitation winding and obtain the sorting sequence;

[0027] Under each operating condition, the temperature data of the reference measuring point on each excitation winding is used as the representative temperature; the difference between the representative temperatures of all adjacent excitation windings in the sorting sequence is normalized, and the mean of the normalized values ​​is used as the short-circuit reference weight.

[0028] The temperature distribution non-uniformity is weighted using the short-circuit reference weight, and the weighted result is used as the short-circuit coefficient of the suspected short-circuit excitation winding under the corresponding operating condition.

[0029] Furthermore, the method for obtaining the communication necessity coefficient includes:

[0030] The average of the ranges of the collected temperatures of the suspected short-circuit excitation winding under different operating conditions is used as the temperature change weight. Using the temperature change weight, the average of the short-circuit coefficients of the suspected short-circuit excitation winding under all operating conditions is weighted, and the normalized result of the weighted result is used as the necessary communication coefficient for generator short-circuit information.

[0031] Furthermore, the control method for fault data communication transmission of the pumped storage power station includes:

[0032] When the communication necessity coefficient is greater than the preset coefficient threshold, a fault command is generated and communication is transmitted; when the communication necessity coefficient is less than or equal to the preset coefficient threshold, communication is not transmitted.

[0033] The present invention also proposes a data communication control system for a pumped storage power station, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of a data communication control method for a pumped storage power station.

[0034] The present invention has the following beneficial effects:

[0035] This invention acquires temperature data from each preset measuring point on each excitation winding of a generator under different operating conditions within a preset historical time period at the current moment. This prepares for subsequent analysis of the temperature distribution information of the excitation windings on the generator and assessment of the possibility of short-circuit faults. Then, under each operating condition, based on the dispersion of temperature data from all preset measuring points on each excitation winding and the location distribution of each preset measuring point, the influence of factors such as heat radiation and heat dissipation caused by coil density on the temperature of the preset measuring points is corrected, thereby accurately obtaining the temperature distribution non-uniformity of each excitation winding. Further, all operating conditions are integrated to screen out suspected short-circuited excitation windings. Then, under each operating condition, combined with the temperature information and location distribution information of the remaining excitation windings, the influence of suspected short-circuited excitation windings on the temperature of different excitation windings is assessed, thereby obtaining a short-circuit coefficient reflecting the degree of fault of the suspected short-circuited excitation winding. Further, at the current moment, the communication necessity coefficient of generator short-circuit information is obtained by integrating the short-circuit coefficient and temperature change of the suspected short-circuited excitation windings under all operating conditions. Finally, the communication necessity coefficient is used to control the fault data communication transmission of the pumped storage power station. This invention combines the distribution of the excitation winding on the generator and the coil density on the excitation winding to analyze the temperature distribution information of each excitation winding at different power generation stages. Then, by integrating the temperature components of the excitation winding at all power generation stages, it accurately assesses the possibility of short-circuit faults to determine the necessity of communication. By transmitting fault-related information through targeted communication, it reduces the communication burden while minimizing fault losses. Attached Figure Description

[0036] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A flowchart of a data communication control method for a pumped storage power station provided in one embodiment of the present invention;

[0038] Figure 2 This is a flowchart illustrating a method for obtaining temperature distribution non-uniformity according to an embodiment of the present invention. Detailed Implementation

[0039] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation, structure, features, and effects of a data communication control method and system for a pumped storage power station proposed according to the present invention. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0041] The following description, in conjunction with the accompanying drawings, details a specific scheme for a data communication control method and system for a pumped storage power station provided by the present invention.

[0042] Please see Figure 1 The diagram illustrates a flowchart of a data communication control method for a pumped storage power station according to an embodiment of the present invention, specifically including:

[0043] Step S1: Within the preset historical time period at the current moment, acquire the temperature data of each preset measuring point on each excitation winding of the generator under different operating conditions; all preset measuring points on each excitation winding are distributed at equal intervals along the axial direction of the excitation winding, starting from the pole shoe side.

[0044] To improve the accuracy of fault condition identification in pumped storage power stations and thus enhance the data communication and control effectiveness, this invention analyzes the temperature distribution information of the excitation winding of each generator within a preset historical time period at the current moment. This analysis assesses the likelihood of a short-circuit fault, and then determines whether to transmit the fault information to the power station management platform or control center to warn relevant personnel based on the short-circuit fault probability. By transmitting fault-related information in a targeted manner, the communication burden is reduced while minimizing fault losses.

[0045] It should be noted that the embodiments of the present invention are aimed at the communication transmission control of short-circuit fault information of the excitation winding of the generator in a pumped storage power station. A pumped storage power station may include multiple generators, and the fault information communication control method is the same for each generator. Here, only one generator is used as an example for analysis and description.

[0046] In one embodiment of the present invention, several preset measuring points are first arranged on each excitation winding of the generator, and a temperature sensor is set on each preset measuring point to collect the temperature information of the excitation winding at each preset measuring point. The preset measuring points on each excitation winding are located on the same straight line on any side of the excitation winding, starting from the pole shoe side and evenly distributed along the axial direction of the excitation winding. In this example, 13 preset measuring points are arranged on each excitation winding. The implementer can also determine the arrangement scheme of the preset measuring points according to the actual situation.

[0047] Since the power generation efficiency of a generator is affected by its power, and the power of a generator is related to the kinetic energy or flow velocity of water, the power of a generator may vary at different stages. Therefore, in one embodiment of the present invention, the historical period from the start of generator generation to the current time is further defined as a preset historical period. The implementer may also define the period within one hour of the current time as the preset historical period. Then, the preset historical period is divided into several corresponding periods under different operating conditions. Each period corresponding to a different operating condition is a period corresponding to similar power generation, reflecting a stable power generation stage. This prepares for subsequent analysis of the temperature change of the excitation winding under different operating conditions to assess the degree of short-circuit fault.

[0048] In a preferred embodiment of the present invention, the method for obtaining the operating condition includes: acquiring the power of the generator at each moment within a preset historical time period at the current moment, specifically setting the acquisition frequency to once per minute, which can also be customized by the implementer; constructing a power sequence according to the acquisition order; constructing a first-order absolute difference sequence by taking the absolute value of the difference value in the first-order difference sequence of the power sequence; using the sorting sequence number corresponding to the absolute value of the difference value less than a preset threshold in the first-order absolute difference sequence as the sequence number of the segmentation point, segmenting the power sequence using the segmentation point, and taking each segment as a time period corresponding to an operating condition; wherein the preset threshold is 20 megawatts, which can also be defined by the implementer.

[0049] Then, within each operating condition and corresponding time period, the temperature of each preset measuring point on each excitation winding is collected at each sampling time using the set temperature sensor. The average of the sampling temperatures at all sampling times is used as the temperature data of the corresponding preset measuring point under the corresponding operating condition, in order to prepare for subsequent analysis of the temperature distribution information on the excitation winding.

[0050] It should be noted that obtaining the power of a generator at each moment is existing technology and will not be elaborated here.

[0051] Step S2: Under each operating condition, based on the dispersion of temperature data at all preset measuring points on each excitation winding and the location distribution of each preset measuring point, obtain the temperature distribution non-uniformity of each excitation winding; based on the temperature distribution non-uniformity of each excitation winding under all operating conditions, screen out suspected short-circuit excitation windings from all excitation windings.

[0052] Considering that if a short circuit occurs on each excitation winding, the short-circuited turns may not be able to conduct electricity normally or there may be no current flow, resulting in a local reduction in heat generation and thus a difference in temperature distribution on the excitation winding; and considering that the temperature of the preset measuring points is also affected by the distribution of their locations, the preset measuring points near the center of the excitation winding have a high density of turns and a high current density, and are more affected by heat radiation. Even if there is a short circuit at their location that causes a local temperature reduction, the temperature will still be higher than that of other preset measuring points near the pole shoes or yokes due to the heat generation of the surrounding normal turns. This is because the preset measuring points near the pole shoes or yokes have fewer turns around them, are less affected by heat radiation, and have a higher heat dissipation rate than the center of the excitation winding.

[0053] Therefore, in this embodiment of the invention, the location distribution of each preset measuring point is combined to analyze the dispersion of temperature data of all preset measuring points on each excitation winding, and the temperature distribution non-uniformity of each excitation winding under each operating condition is obtained. The temperature distribution non-uniformity initially reflects the possibility of fault in the excitation winding. Then, by combining the temperature distribution non-uniformity of all excitation windings under all operating conditions, suspected short-circuit excitation windings are analyzed and screened out, which prepares for subsequent analysis of their short-circuit coefficient.

[0054] Preferably, in one embodiment of the present invention, the method for obtaining the temperature distribution non-uniformity includes:

[0055] Please see Figure 2 The diagram illustrates a flowchart of a method for obtaining temperature distribution non-uniformity according to an embodiment of the present invention, specifically including:

[0056] Step S201: Under each operating condition, the initial temperature distribution non-uniformity of each excitation winding is obtained based on the standard deviation and range of the temperature data of all preset measuring points on each excitation winding.

[0057] Considering that both standard deviation and range can reflect the dispersion of data, they can indirectly reflect the degree of difference in temperature data at all preset measuring points on each excitation winding. Based on this, the initial temperature distribution non-uniformity of each excitation winding can be obtained. The initial temperature distribution non-uniformity initially reflects the short-circuit probability of the excitation winding, which prepares for accurate evaluation and screening of suspected short-circuit excitation windings in combination with the location distribution of preset measuring points.

[0058] In a preferred embodiment of the present invention, the method for obtaining the initial temperature distribution non-uniformity includes:

[0059] Under each operating condition, the normalized result of the standard deviation of the temperature data of all preset measuring points on each excitation winding is used as the first temperature distribution non-uniformity parameter of each excitation winding.

[0060] Under each operating condition, the range of temperature data at all preset measuring points on each excitation winding is used as the second temperature distribution non-uniformity parameter for each excitation winding.

[0061] The product of the first temperature distribution non-uniformity parameter and the second temperature distribution non-uniformity parameter is used as the initial temperature distribution non-uniformity of the corresponding excitation winding.

[0062] As an example, the formula for calculating the initial temperature distribution non-uniformity is:

[0063] Where i is the operating condition number; k is the excitation winding number; Q i,k σ represents the initial temperature distribution non-uniformity of the k-th excitation winding under the i-th operating condition; i,k Let be the standard deviation of the temperature data at all preset measuring points for the k-th excitation winding under the i-th operating condition; max{σ k} represents the maximum standard deviation of temperature data at all preset measuring points for the k-th excitation winding under all operating conditions; T represents the first temperature distribution non-uniformity parameter of the k-th excitation winding under the i-th operating condition; i,k,max T represents the maximum temperature data among all preset measuring points for the k-th excitation winding under the i-th operating condition; i,k,min T represents the minimum temperature data among all preset measuring points for the k-th excitation winding under the i-th operating condition; i,k,max -T i,k,min ) represents the second temperature distribution non-uniformity parameter of the k-th excitation winding under the i-th operating condition.

[0064] In the above formula, the standard deviation is normalized by using the ratio of the standard deviation to the maximum standard deviation. The larger the standard deviation, the larger the normalized value, indicating that there is a large difference in the temperature data at different preset measuring points, and the larger the first temperature distribution non-uniformity parameter is. At the same time, the larger the range, the larger the temperature data at different preset measuring points is, and the larger the second temperature distribution non-uniformity parameter is. Finally, the two are multiplied and combined to obtain the initial temperature distribution non-uniformity.

[0065] In other examples, implementers may also use other basic mathematical operations such as addition or weighted summation to combine the two, which will not be elaborated further; or other discrete measures such as variance may be used to replace standard deviation and range, which are all existing technologies and will not be elaborated further.

[0066] Step S202: Under each operating condition, on each excitation winding, based on the temperature data and location of each preset measuring point, suspected short-circuit measuring points and thermal radiation reference measuring points are selected from all preset measuring points; based on the spatial distance between the suspected short-circuit point and the reference measuring point, the correction weight is obtained.

[0067] Considering that the temperature data of the preset measurement points near the short circuit should be relatively lower than other measurement points, this example first screens out suspected short circuit measurement points based on the temperature data of the preset measurement points on the excitation winding. Furthermore, considering that the temperature data at each preset measurement point may also be affected by factors such as the thermal radiation from the surrounding windings and the heat dissipation efficiency of its location, and that the temperature data of the preset measurement points located in the middle section of the excitation winding are more significantly affected by these factors, making it difficult to identify the temperature changes during a short circuit, this example further screens out the thermal radiation reference measurement points most affected by thermal radiation. If a suspected short circuit measurement point is closer to the thermal radiation reference measurement point, it indicates a lower confidence level in the initial temperature distribution non-uniformity, requiring further correction.

[0068] In a preferred embodiment of the present invention, the method for obtaining suspected short-circuit points and thermal radiation reference measurement points includes:

[0069] Among all the preset measurement points of each excitation winding, the preset measurement point with the lowest temperature data is taken as the suspected short circuit point of the excitation winding; among all the preset measurement points in the axial direction of the excitation winding, the preset measurement point located at the center is taken as the thermal radiation reference measurement point; as an example, starting from the pole shoe side, the preset measurement points are assigned numbers in sequence, such as 1-13, and the preset measurement point numbered 7 located at the center of the excitation winding is taken as the thermal radiation reference measurement point.

[0070] After obtaining the suspected short-circuit test points and thermal radiation reference test points, the correction weights can be further obtained based on the spatial distance between the suspected short-circuit test points and the thermal radiation reference test points.

[0071] As an example, the formula for calculating the correction weight is: Where i is the operating condition number; k is the excitation winding number; P i,k is the correction weight for the initial temperature distribution non-uniformity of the k-th excitation winding under the i-th operating condition; f() is the mapping function, with a value range of -1 to 1; p is the sign of the suspected short-circuit point of the k-th excitation winding under the i-th operating condition; q is the sign of the thermal radiation reference measurement point of the k-th excitation winding under the i-th operating condition; l i,k,p,q Let max{l} be the spatial distance between the suspected short-circuit point and the thermal radiation reference measuring point of the k-th excitation winding under the i-th operating condition; i,k,p} represents the maximum spatial distance between the suspected short-circuit point and the other preset measuring points of the k-th excitation winding under the i-th operating condition.

[0072] In the above formula, the spatial distance between the suspected short-circuit point and the thermal radiation reference measurement point is normalized by dividing by the maximum value. Then, the normalized value is mapped to the interval between -1 and 1. The smaller the normalized value, the closer the suspected short-circuit point is to the thermal radiation reference measurement point, the lower the confidence of the initial temperature distribution non-uniformity, the more likely the mapping result is to be negative, and the greater the correction weight.

[0073] In other examples, implementers can also directly perform negative correlation normalization on the spatial distance between the suspected short-circuit point and the thermal radiation reference measurement point, such as treating it as x in the exponential function exp(-x) with the natural constant e as the base, and then add a constant 1 to the negative correlation normalization result to obtain the correction weight; implementers can also use other negative correlation normalization methods, which will not be elaborated here.

[0074] Step S203: The initial temperature distribution non-uniformity is weighted using correction weights, and the normalized result of the weighted result is taken as the temperature distribution non-uniformity.

[0075] As an example, the correction weights are multiplied and combined with the initial temperature distribution non-uniformity, the product is mapped to the sigmoid function for normalization, and the normalization result is used as the temperature distribution non-uniformity. In other examples, implementers may also use other normalization methods, which are all existing technologies and will not be elaborated further.

[0076] After obtaining the temperature distribution non-uniformity of each excitation winding under each operating condition, the temperature distribution non-uniformity of all excitation windings under all operating conditions can be further integrated to analyze and screen out suspected short-circuit excitation windings.

[0077] Preferably, in one embodiment of the present invention, the method for obtaining a suspected short-circuit excitation winding includes:

[0078] Under each operating condition, the excitation winding with a temperature distribution non-uniformity greater than a preset threshold is selected as the initial screening suspected short-circuit excitation winding; among all the initial screening suspected short-circuit excitation windings under all operating conditions, the initial screening suspected short-circuit excitation winding with the highest frequency of occurrence is selected as the suspected short-circuit excitation winding; the preset threshold is set to 0.7, but the implementer can also define it themselves.

[0079] Step S3: Under each operating condition, based on the temperature distribution non-uniformity of the suspected short-circuit excitation winding, and combined with the temperature and location distribution information of the other excitation windings, obtain the short-circuit coefficient of the suspected short-circuit excitation winding; at the current moment, based on the short-circuit coefficient of the suspected short-circuit excitation winding under all operating conditions, and the temperature change of the suspected short-circuit excitation winding under different operating conditions, obtain the communication necessity coefficient of the generator short-circuit information.

[0080] Considering the thermal radiation effect between different excitation windings in a generator, when a suspected short-circuit excitation winding experiences a short circuit, its temperature will decrease relatively compared to other normally operating excitation windings. This will lead to a slight decrease in the temperature of adjacent excitation windings as well. The temperature impact on other excitation windings will be minimal the further away they are from the suspected short-circuit excitation winding. Furthermore, considering that a short circuit in some excitation windings of a generator may lead to an increase in excitation current, thereby increasing the overall heat generation of the remaining excitation windings, the temperature difference between the remaining normal excitation windings and the short-circuit fault excitation winding will be even greater.

[0081] Based on this, the embodiments of the present invention will further obtain the short-circuit coefficient of the suspected short-circuit excitation winding under each operating condition by combining the temperature distribution non-uniformity of the suspected short-circuit excitation winding with the temperature information and position distribution information of the other excitation windings. The short-circuit coefficient reflects the degree of short-circuit fault of the suspected short-circuit excitation winding and prepares for the subsequent evaluation of the communication necessity coefficient of generator short-circuit information to control communication transmission.

[0082] Preferably, in one embodiment of the present invention, considering the overall temperature change of the excitation resistor on the generator, it should roughly satisfy the rule that the excitation winding farther away from the suspected short-circuit excitation winding has a relatively higher overall temperature. Therefore, a sorting sequence can be constructed first, and then the overall temperature change of each excitation winding in the sorting sequence can be analyzed to see if it conforms to the above rule. Therefore, the method for obtaining the short-circuit coefficient includes:

[0083] Based on the spatial distance between each excitation winding and the suspected short-circuit excitation winding, sort all excitation windings except the suspected short-circuit excitation winding and obtain the sorting sequence;

[0084] Under each operating condition, the temperature data of the reference measuring point on each excitation winding is used as the representative temperature; the difference between the representative temperatures of all adjacent excitation windings in the sorted sequence is normalized, and the mean of the normalized values ​​is used as the short-circuit reference weight.

[0085] The temperature distribution non-uniformity is weighted using short-circuit reference weights, and the weighted result is used as the short-circuit coefficient of the suspected short-circuit excitation winding under the corresponding operating conditions.

[0086] As an example, all excitation windings except for the suspected short-circuit excitation winding are sorted in descending order of spatial distance to construct a sorting sequence. It should be noted that, considering that different excitation windings in a generator are generally axially symmetric or centrally symmetric, some excitation windings may have the same spatial distance as the suspected short-circuit excitation winding during the sorting process. When sorting, the order of such excitation windings does not matter, but the excitation winding closer to the suspected short-circuit excitation winding must be placed after the excitation winding closer to the suspected short-circuit excitation winding.

[0087] Then, under each operating condition, the representative temperature of each excitation winding is obtained, which reflects the overall temperature of each excitation winding. Next, the short-circuit reference weight is obtained. The larger the linear normalized value of all differences, the larger the mean, indicating that the excitation winding farther from the suspected short-circuit excitation winding has a relatively higher overall temperature. This also indirectly indicates that the suspected short-circuit excitation winding has a greater short-circuit impact on other excitation windings. Finally, the short-circuit reference weight is multiplied and combined with the temperature distribution non-uniformity to obtain the short-circuit coefficient of the suspected short-circuit excitation winding under the corresponding operating condition. The larger the short-circuit coefficient, the greater the short-circuit probability and impact of the suspected short-circuit excitation winding.

[0088] In other examples, implementers may also use other means such as slope to evaluate the overall temperature change of the excitation winding in the sorting sequence, thereby obtaining the short-circuit reference weight; or the mean or mode of the temperature data of all preset measuring points on the excitation winding may be used as the representative temperature, which will not be elaborated further.

[0089] After obtaining the short-circuit coefficient of the suspected short-circuit excitation winding under all operating conditions, the short-circuit performance of the suspected short-circuit excitation winding under different operating conditions can be considered at the current moment. Furthermore, the temperature change of the suspected short-circuit excitation winding under different operating conditions can be combined to obtain the communication necessity coefficient of the generator short-circuit information. The communication necessity coefficient reflects the degree of fault and the impact of the short circuit of the suspected short-circuit excitation winding at the current moment. The larger the communication necessity coefficient, the more timely the communication should be transmitted to the power plant management platform or central control center to warn relevant personnel.

[0090] Preferably, in one embodiment of the present invention, considering that the range of the collected temperatures of the suspected short-circuited excitation winding under each operating condition also initially reflects the impact of temperature changes caused by the short circuit, the larger the range, the greater the degree of short circuit impact. Therefore, the communication necessity coefficient for short-circuit fault information of the suspected short-circuited excitation winding can be evaluated by comprehensively considering the short-circuit impact information and short-circuit coefficient under all operating conditions up to the current moment. The method for obtaining the communication necessity coefficient includes:

[0091] The average of the range of the collected temperatures of the suspected short-circuit excitation winding under different operating conditions is used as the weight of temperature change.

[0092] By using temperature variation weights, the mean short-circuit coefficients of suspected short-circuit excitation windings under all operating conditions are weighted, and the normalized result of the weighted result is used as the necessary communication coefficient for generator short-circuit information.

[0093] As an example, firstly, within the data collection period corresponding to each operating condition, the range of the collected temperature of the suspected short-circuit excitation winding at all data collection times is obtained. The range reflects the degree of short-circuit impact of the suspected short-circuit excitation winding under that operating condition. Then, the mean of the ranges under all operating conditions is used as the temperature change weight to comprehensively evaluate the temperature change of the suspected short-circuit excitation winding, which indirectly reflects the severity of the short circuit of the suspected short-circuit excitation winding within the preset historical period.

[0094] Further calculations are performed on the mean short-circuit coefficient of the suspected short-circuit excitation winding under all operating conditions. The mean short-circuit coefficient also reflects the severity of the short circuit of the suspected short-circuit excitation winding within a preset historical period. Finally, the temperature change weight and the mean short-circuit coefficient are multiplied and combined, and the product is linearly normalized to obtain the communication necessity coefficient for generator short-circuit information at the current moment.

[0095] In other examples, other normalization methods can also be used, and their acquisition, along with the range, are existing technologies and will not be elaborated further.

[0096] Step S4: Control the fault data communication transmission of the pumped storage power station according to the communication necessity coefficient.

[0097] Once the necessary communication coefficients are obtained, the fault data communication transmission of the pumped storage power station can be further controlled.

[0098] Preferably, in one embodiment of the present invention, when the communication necessity coefficient is greater than a preset coefficient threshold, a fault command is generated and transmitted, that is, the command containing the serial number of the suspected short-circuit excitation winding and the command indicating that a short-circuit fault has occurred is transmitted to the power plant management platform or central control center to warn relevant personnel; when the communication necessity coefficient is less than or equal to the preset coefficient threshold, no communication transmission is performed; wherein the preset coefficient is preset to 0.3, and the implementer may also define it himself.

[0099] In another embodiment of the present invention, the implementer may also multiply the communication necessity coefficient of the generator short-circuit fault information at the current moment by a constant of 10 to obtain the communication priority; then, in conjunction with other monitoring methods, assess whether there are other fault instructions at the current moment, such as mechanical faults of the inlet valve, transformer faults, or excessively high water levels in the reservoir, which require communication transmission to the power plant management platform or central control center for early warning; and then, based on the fault or early warning level table pre-designed during the construction of the pumped storage power plant, obtain the fault or early warning level of each fault instruction; the fault or early warning level of each fault instruction is 1-10;

[0100] For example, if a pumped-storage power station experiences multiple faults at the current moment, such as a mechanical fault in the inlet valve and a short-circuit fault in the generator simultaneously, the fault or warning level of the mechanical fault in the inlet valve can be determined by consulting the fault level table to be 6, so its communication priority is 6, while the communication priority of the generator short-circuit fault is 8. The faults will then be communicated to the staff in descending order of communication priority, that is, the instruction for the generator short-circuit fault will be communicated first, and then the instruction for the mechanical fault in the inlet valve will be communicated, thereby alleviating communication congestion and improving communication efficiency.

[0101] The present invention also proposes a data communication control system for a pumped storage power station, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of a data communication control method for a pumped storage power station.

[0102] In summary, this invention first acquires temperature data from each preset measuring point on each excitation winding of the generator under different operating conditions; then, combining the location distribution of the preset measuring points, it analyzes and obtains the temperature distribution non-uniformity of each excitation winding under each operating condition; further, it comprehensively analyzes and filters out suspected short-circuit excitation windings based on all operating conditions; it further analyzes and obtains the short-circuit coefficient of the suspected short-circuit excitation windings under each operating condition; and then analyzes and obtains the communication necessity coefficient of the generator short-circuit information at the current moment, controlling the fault data communication transmission of the pumped storage power station. This invention combines the distribution of the excitation windings on the generator and the coil density on the excitation windings to analyze the temperature distribution information of each excitation winding at different power generation stages, and then comprehensively analyzes the temperature components of the excitation windings at all power generation stages to accurately assess the possibility of short-circuit faults and determine the necessity of communication; through targeted communication transmission of fault-related information, it reduces communication burden while minimizing fault losses.

[0103] It should be noted that the order of the above embodiments of the present invention is merely for descriptive purposes and does not represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0104] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

Claims

1. A data communication control method for a pumped storage power station, characterized in that, The method includes: Within a preset historical time period at the current moment, acquire temperature data of each preset measuring point on each excitation winding of the generator under different operating conditions; all preset measuring points on each excitation winding are distributed at equal intervals along the axial direction of the excitation winding, starting from the pole shoe side. Under each operating condition, based on the dispersion of the temperature data at all preset measuring points on each excitation winding, and combined with the positional distribution of each preset measuring point, the temperature distribution non-uniformity of each excitation winding is obtained; by combining the temperature distribution non-uniformity of each excitation winding under all operating conditions, suspected short-circuit excitation windings are selected from all excitation windings. Under each operating condition, based on the temperature distribution non-uniformity of the suspected short-circuit excitation winding, and combined with the temperature data and position distribution information of the reference measuring points on the other excitation windings, the short-circuit coefficient of the suspected short-circuit excitation winding is obtained; at the current moment, based on the short-circuit coefficient of the suspected short-circuit excitation winding under all operating conditions, and the temperature change of the suspected short-circuit excitation winding under different operating conditions, the communication necessity coefficient of the generator short-circuit information is obtained; The fault data communication transmission of the pumped storage power station is controlled according to the aforementioned communication necessity coefficient.

2. The data communication control method for a pumped storage power station according to claim 1, characterized in that, The method for acquiring the temperature data includes: Within a preset historical time period at the current moment, the power of the generator at each moment is acquired, and the power is constructed into a power sequence according to the acquisition order; the absolute values ​​of the difference values ​​in the first-order difference sequence of the power sequence are taken to construct a first-order absolute difference sequence; the absolute values ​​of the difference values ​​less than a preset threshold in the first-order absolute difference sequence are used as the sequence numbers of the segmentation points, and the power sequence is segmented using the segmentation points, with each segment corresponding to an acquisition time period as a time period corresponding to an operating condition; Within each operating condition and corresponding time period, the average temperature of each preset measuring point on each excitation winding at all sampling times is taken as the temperature data.

3. The data communication control method for a pumped storage power station according to claim 2, characterized in that, The method for obtaining the temperature distribution non-uniformity includes: Under each operating condition, the initial temperature distribution non-uniformity of each excitation winding is obtained based on the standard deviation and range of the temperature data at all preset measuring points on each excitation winding. Under each operating condition, on each excitation winding, based on the temperature data and location of each preset measuring point, suspected short-circuit measuring points and thermal radiation reference measuring points are selected from all preset measuring points; and correction weights are obtained based on the spatial distance between the suspected short-circuit points and the reference measuring points. The initial temperature distribution non-uniformity is weighted using the correction weights, and the normalized result of the weighted result is taken as the temperature distribution non-uniformity.

4. The data communication control method for a pumped storage power station according to claim 3, characterized in that, The method for obtaining the initial temperature distribution non-uniformity includes: Under each operating condition, the normalized result of the standard deviation of the temperature data at all preset measuring points on each excitation winding is used as the first temperature distribution non-uniformity parameter for each excitation winding. Under each operating condition, the range of the temperature data at all preset measuring points on each excitation winding is used as the second temperature distribution non-uniformity parameter for each excitation winding. The product of the first temperature distribution non-uniformity parameter and the second temperature distribution non-uniformity parameter is used as the initial temperature distribution non-uniformity of the corresponding excitation winding.

5. A data communication control method for a pumped storage power station according to claim 3, characterized in that, The methods for obtaining the suspected short-circuit point and the thermal radiation reference measurement point include: Among all the preset measurement points of each excitation winding, the preset measurement point with the smallest temperature data is taken as the suspected short circuit point of the excitation winding; among all the preset measurement points in the axial direction of the excitation winding, the preset measurement point located at the center is taken as the thermal radiation reference measurement point.

6. A data communication control method for a pumped storage power station according to claim 1, characterized in that, The method for obtaining the suspected short-circuited excitation winding includes: Under each operating condition, the excitation winding with a temperature distribution non-uniformity greater than a preset threshold is selected as the initial screening suspected short-circuit excitation winding; among all the initial screening suspected short-circuit excitation windings under all operating conditions, the initial screening suspected short-circuit excitation winding with the highest frequency of occurrence is selected as the suspected short-circuit excitation winding.

7. A data communication control method for a pumped storage power station according to claim 3, characterized in that, The method for obtaining the short-circuit coefficient includes: Based on the spatial distance between each excitation winding and the suspected short-circuit excitation winding, sort all excitation windings except the suspected short-circuit excitation winding and obtain the sorting sequence; Under each operating condition, the temperature data of the reference measuring point on each excitation winding is used as the representative temperature; the difference between the representative temperatures of all adjacent excitation windings in the sorting sequence is normalized, and the mean of the normalized values ​​is used as the short-circuit reference weight. The temperature distribution non-uniformity is weighted using the short-circuit reference weight, and the weighted result is used as the short-circuit coefficient of the suspected short-circuit excitation winding under the corresponding operating condition.

8. A data communication control method for a pumped storage power station according to claim 7, characterized in that, The method for obtaining the communication necessity coefficient includes: The average of the ranges of the collected temperatures of the suspected short-circuit excitation winding under different operating conditions is used as the temperature change weight. Using the temperature change weight, the average of the short-circuit coefficients of the suspected short-circuit excitation winding under all operating conditions is weighted, and the normalized result of the weighted result is used as the necessary communication coefficient for generator short-circuit information.

9. A data communication control method for a pumped storage power station according to claim 1, characterized in that, The control method for fault data communication transmission of the pumped storage power station includes: When the communication necessity coefficient is greater than the preset coefficient threshold, a fault command is generated and communication is transmitted; when the communication necessity coefficient is less than or equal to the preset coefficient threshold, communication is not transmitted.

10. A data communication control system for a pumped storage power station, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the data communication control method for a pumped storage power station as described in any one of claims 1-9.

Images