Data communication control method and system for pumped storage power station

Abstract

The invention relates to the technical field of power station data acquisition control, in particular to a data communication control method and system for a pumped storage power station. The method comprises the following steps: firstly, acquiring temperature data of each preset measuring point on an exciting winding under different working conditions; then, in combination with the position distribution of the preset measuring points, the temperature distribution unevenness of each excitation winding under each working condition is obtained, and then suspected short-circuit excitation windings are screened out; and then acquiring a short-circuit coefficient of the suspected short-circuit excitation winding under each working condition, and evaluating a communication necessary coefficient of short-circuit information of the generator at the current moment to control communication transmission. According to the method, the temperature distribution of the excitation winding in different power generation stages is analyzed by combining the distribution of the excitation winding and the distribution of wire turns on the excitation winding, so that the temperature distribution of the excitation winding in all the power generation stages is synthesized, and the short-circuit fault possibility and the communication necessity are accurately evaluated; fault related information is transmitted through targeted communication, so that communication burden is reduced, and fault loss is reduced at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of power station data acquisition and control, and particularly relates to a data communication control method and system for a pumped-storage power station. Background Art

[0002] A pumped-storage power station, also known as a storage-type hydropower station, pumps water to a high place for storage with excess power during low power demand, and releases the stored water to drive a water turbine generator to generate electricity during peak demand. It is a special power station for energy storage and regulating the power grid load. The generator is a key device in a pumped-storage power station, and its operating state will directly affect the load balance of the power grid. By transmitting the relevant operating data of the generator in a timely manner, it can help to evaluate the fault state of the generator in real time, etc., so as to be able to take relevant measures in a timely manner to ensure the safe and stable operation of the power station and optimize the operation efficiency of the power station.

[0003] In the prior art, to improve the communication transmission efficiency, fault data is usually transmitted specifically, so as to reduce the communication frequency and data volume and reduce the communication burden; therefore, the accuracy of generator fault information is crucial. A short circuit in the excitation winding is a common fault in a generator. The short circuit will cause the winding to overheat and then accelerate the aging of the turns, and even generate arc discharge, which will damage the winding and its surrounding structure. Currently, it is usually based on the local temperature distribution of the excitation winding to evaluate whether the excitation winding is short-circuited. However, the temperature change of the excitation winding is also affected by factors such as the thermal radiation or heat dissipation of the surrounding excitation windings. The accuracy of the short-circuit fault analysis of the excitation winding is relatively low, which in turn affects the subsequent communication effect of the fault information. Summary of the Invention

[0004] In order to solve the technical problem that the prior art has poor communication control effect on the fault information of a pumped-storage power station, the purpose of the present invention is to provide a data communication control method and system for a pumped-storage power station, and the specific technical solutions adopted are as follows:

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

[0006] Obtain the temperature data of each preset measurement point on each excitation winding of the generator under different working conditions within a preset historical period at the current moment; all the preset measurement points on each excitation winding are equally spaced along the axial direction of the excitation winding starting from one side of the pole shoe;

[0007] Under each working condition, according to the discrete situation of the temperature data of all the preset measurement points on each excitation winding, combined with the position distribution situation of each preset measurement point, obtain the temperature distribution non-uniformity of each excitation winding; comprehensively consider the temperature distribution non-uniformity of each excitation winding under all working conditions, and screen out the suspected short-circuit excitation windings from all the excitation windings;

[0008] Under each working condition, according to the non-uniformity of the temperature distribution of the suspected short-circuited excitation winding, combined with the temperature information and position distribution information of the remaining excitation windings, obtain the short-circuit coefficient of the suspected short-circuited excitation winding; at the current moment, according to the short-circuit coefficients of the suspected short-circuited excitation winding under all working conditions and the temperature change of the suspected short-circuited excitation winding under different working conditions, obtain the communication necessary coefficient of the generator short-circuit information;

[0009] Control the fault data communication transmission of the pumped-storage power station according to the communication necessary coefficient.

[0010] Further, the method for obtaining the temperature data includes:

[0011] Within a preset historical period at the current moment, obtain the power of the generator at each moment, and construct a power sequence with the power in the acquisition order; take the absolute value of the difference value in the first-order difference sequence of the power sequence to construct a first-order absolute difference sequence; use the serial number corresponding to the absolute value of the difference value less than the preset threshold in the first-order absolute difference sequence as the serial number of the segmentation point, and segment the power sequence using the segmentation point, and take each segmented corresponding acquisition period as a working condition corresponding period;

[0012] Within each working condition corresponding period, take the average value of the collected temperatures of each preset measurement point on each excitation winding at all acquisition moments as the temperature data.

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

[0014] Under each working condition, according to the standard deviation and range of the temperature data of all preset measurement points on each excitation winding, obtain the initial temperature distribution non-uniformity of each excitation winding;

[0015] Under each working condition, on each excitation winding, according to the temperature data and the location of each preset measurement point, respectively screen out the suspected short-circuit measurement points and the heat radiation reference measurement points from all preset measurement points; according to the spatial distance between the suspected short-circuit points and the reference measurement points, obtain the correction weight;

[0016] Weight the initial temperature distribution non-uniformity with the correction weight, and take the normalized result of the weighted result as the temperature distribution non-uniformity.

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

[0018] Under each working condition, take the normalized result of the standard deviation of the temperature data of all preset measurement points on each excitation winding as the first temperature distribution non-uniformity parameter of each excitation winding;

[0019] Under each working condition, the range of the temperature data at all preset measuring points on each exciting winding is used as the second temperature distribution unevenness parameter of each exciting winding;

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

[0021] Further, the method for obtaining the suspected short-circuit point and the heat radiation reference measuring point includes:

[0022] Among all the preset measuring points of each exciting winding, the preset measuring point with the smallest temperature data is used as the suspected short-circuit point of the exciting winding; among all the preset measuring points in the axial direction of the exciting winding, the preset measuring point located at the center is used as the heat radiation reference measuring point.

[0023] Further, the method for obtaining the suspected short-circuit exciting winding includes:

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

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

[0026] According to the spatial distance between each exciting winding and the suspected short-circuit exciting winding, all the exciting windings except the suspected short-circuit exciting winding are sorted and the sorting sequence is obtained;

[0027] Under each working condition, the temperature data of the reference measuring point on each exciting winding is used as the representative temperature; the differences between the representative temperatures of all adjacent exciting windings in the sorting sequence are normalized, and the mean value of the normalized values is used as the short-circuit reference weight;

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

[0029] Further, the method for obtaining the communication necessary coefficient includes:

[0030] The mean value of the ranges of the collected temperatures of the suspected short-circuit exciting winding under different working conditions is used as the temperature change weight; by using the temperature change weight, the mean value of the short-circuit coefficients of the suspected short-circuit exciting winding under all working conditions is weighted, and the normalized result of the weighted result is used as the communication necessary coefficient of the generator short-circuit information.

[0031] Further, the control method for the 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 instruction is generated and communicated; when the communication necessity coefficient is less than or equal to the preset coefficient threshold, communication transmission is not performed.

[0033] The present invention also provides 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, the steps of a data communication control method for a pumped-storage power station are implemented.

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

[0035] In a preset historical period at the current moment, the present invention obtains the temperature data of each preset measurement point on each excitation winding of the generator under different working conditions, preparing for subsequent analysis of the temperature distribution information of the excitation windings on the generator and evaluating the possibility of its short-circuit fault; then, under each working condition, according to the dispersion of the temperature data of all preset measurement points on each excitation winding, combined with the position distribution of each preset measurement point, the influence of factors such as heat radiation and heat dissipation caused by the turn density on the temperature of the preset measurement point is corrected, so as to accurately obtain the temperature non-uniformity of each excitation winding; further, all working conditions are comprehensively considered to screen out the suspected short-circuit excitation windings; then, under each working condition, combined with the temperature information and position distribution information of the remaining excitation windings, the influence of the suspected short-circuit excitation winding on the temperature of different excitation windings is evaluated, so as to obtain the short-circuit coefficient reflecting the fault degree of the suspected short-circuit excitation winding; further, at the current moment, the communication necessity coefficient of the generator short-circuit information is obtained by comprehensively considering the short-circuit coefficients and temperature change conditions of the suspected short-circuit excitation windings under all working conditions; finally, the fault data communication transmission of the pumped-storage power station is controlled according to the communication necessity coefficient. The present invention combines the distribution of the excitation windings on the generator and the turn distribution density on the excitation windings, analyzes the temperature distribution information of each excitation winding at different power generation stages, and then comprehensively considers the temperature parts of the excitation windings in all power generation stages to accurately evaluate the possibility of its short-circuit fault to determine the communication necessity; by targeted communication transmission of fault-related information, the communication burden is reduced while the fault loss is reduced. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 Flowchart of a data communication control method for a pumped - storage power station provided by an embodiment of the present invention;

[0038] Figure 2 Flowchart of a method for obtaining the non - uniformity of temperature distribution provided by an embodiment of the present invention. Detailed implementation manners

[0039] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details a data communication control method and system for a pumped - storage power station according to the present invention, including its specific implementation manners, structures, features, and effects. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the 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 those skilled in the technical field to which the present invention belongs.

[0041] The following specifically describes the specific solutions of a data communication control method and system for a pumped - storage power station provided by the present invention with reference to the accompanying drawings.

[0042] Please refer to Figure 1 , which shows a flowchart of a data communication control method for a pumped - storage power station provided by an embodiment of the present invention, specifically including:

[0043] Step S1, within a preset historical period at the current moment, obtain the temperature data of each preset measurement point on each excitation winding of the generator under different working conditions; all the preset measurement points on each excitation winding are equally spaced along the axial direction of the excitation winding starting from one side of the pole shoe.

[0044] To improve the accuracy of fault state identification of the pumped - storage power station, thereby improving the data communication control effect of the pumped - storage power station, the embodiment of the present invention will analyze the temperature distribution information of the excitation windings on each generator within a preset historical period at the current moment, thereby analyzing and evaluating the possibility of its short - circuit fault. Finally, based on the evaluation of the short - circuit fault possibility, it is determined whether to communicate and transmit to the power station management platform or the centralized control center to warn relevant staff; by specifically communicating and transmitting fault - related information, while reducing the communication burden, the fault loss can be reduced.

[0045] It should be noted that the embodiments of the present invention are directed to the communication transmission control of the short-circuit fault information of the excitation winding on the generator of a pumped-storage power station; there may be multiple generators in a pumped-storage power station, and the fault information communication control methods for each generator are the same. Here, only any one generator is taken as an example for analysis and description.

[0046] In an embodiment of the present invention, first, a number of preset measuring points are arranged on each excitation winding of the generator, and a temperature sensor is set at each preset measuring point to collect the temperature information of the excitation winding at each preset measuring point; among them, the preset measuring points on each excitation winding are located on the same straight line on any side of the excitation winding, starting from one side of the pole shoe and equally spaced along the axial direction of the excitation winding; specifically, 13 are arranged on each excitation winding in this example, and the implementer can also determine the layout scheme of the preset measuring points according to the actual situation.

[0047] Since the power generation efficiency of the generator is affected by its power, and there is a certain relationship between the generator power and the kinetic energy or flow velocity of the water flow, the power of the generator may vary at different stages; therefore, in an embodiment of the present invention, the historical period from the start time of power generation of the generator to the current time is further used as the preset historical period; the implementer can also define, for example, the period within the last hour as the preset historical period; then the preset historical period is divided into corresponding periods under several working conditions, and each working condition corresponding period is the corresponding period with similar power generation power, which reflects a stable power generation stage and prepares for subsequent analysis of the temperature change of the excitation winding under different working conditions to evaluate its short-circuit fault degree;

[0048] Among them, in a preferred embodiment of the present invention, the method for obtaining the working conditions includes: within the preset historical period at the current time, obtaining the power of the generator at each moment, specifically setting the acquisition frequency to once per minute, and the implementer can also customize it; constructing a power sequence according to the acquisition order; constructing a first-order absolute difference sequence by taking the absolute value of the difference values in the first-order difference sequence of the power sequence; using the sequence numbers of the absolute values of the difference values less than the preset threshold in the first-order absolute difference sequence as the sequence numbers of the segmentation points, and segmenting the power sequence by using the segmentation points, and taking each segmented corresponding acquisition period as a working condition corresponding period; where the preset threshold is 20 megawatts, and the implementer can also define it by himself;

[0049] Then, within each working condition corresponding period, use the set temperature sensors to collect the collected temperatures of each preset measuring point on each excitation winding at each acquisition moment, and take the average value of the collected temperatures at all acquisition moments as the temperature data of the corresponding preset measuring point under the corresponding working condition, preparing for subsequent analysis of the temperature distribution information on the excitation winding.

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

[0051] Step S2: Under each working condition, according to the discreteness of the temperature data of all preset measuring points on each exciting winding, combined with the position distribution of each preset measuring point, obtain the temperature distribution non-uniformity of each exciting winding; comprehensively consider the temperature distribution non-uniformity of each exciting winding under all working conditions, and screen out the suspected short-circuited exciting windings from all exciting windings.

[0052] Considering that in each exciting winding, if a short circuit occurs, the short-circuited turns may not be able to conduct electricity normally or there is no current flowing through, resulting in a local reduction in heat generation, and further leading to differences in the temperature distribution on the exciting winding; also considering that the temperature of the preset measuring points is also affected by the layout position distribution, the turn density and current density are large around the preset measuring points near the center of the exciting winding, and it is also greatly affected by heat radiation. Even if there is a short circuit at its location resulting in a local temperature reduction, affected by the heat generation of the surrounding normal turns, its temperature will still be relatively higher than that of other preset measuring points in areas such as near the pole shoe or yoke, because the number of turns around the preset measuring points in areas such as near the pole shoe or yoke is less, the heat radiation effect is smaller, and the heat dissipation rate is relatively higher than that at the center of the exciting winding;

[0053] Therefore, in the embodiments of the present invention, the position distribution of each preset measuring point will be combined to analyze the discreteness of the temperature data of all preset measuring points on each exciting winding, and obtain the temperature distribution non-uniformity of each exciting winding under each working condition; the temperature distribution non-uniformity initially reflects the fault possibility of the exciting winding. Furthermore, by comprehensively considering the temperature distribution non-uniformity of all exciting windings under all working conditions, analyze and screen out the suspected short-circuited exciting windings to prepare for subsequent analysis of its short-circuit coefficient.

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

[0055] Please refer to Figure 2 , which shows a flowchart of a method for obtaining the temperature distribution non-uniformity provided by an embodiment of the present invention, specifically including:

[0056] Step S201: Under each working condition, according to the standard deviation and range of the temperature data of all preset measuring points on each exciting winding, obtain the initial temperature distribution non-uniformity of each exciting winding.

[0057] Considering that both the standard deviation and the range can reflect the dispersion of data, and thus can indirectly reflect the degree of difference in the temperature data of all preset measurement points on each excitation winding; based on this, the initial temperature distribution non-uniformity of each excitation winding can be obtained, and the initial temperature distribution non-uniformity preliminarily reflects the short-circuit possibility of the excitation winding, preparing for accurately evaluating and screening suspected short-circuit excitation windings in combination with the position distribution of the preset measurement points in the subsequent process.

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

[0059] Under each working condition, taking the normalization result of the standard deviation of the temperature data of all preset measurement points on each excitation winding as the first temperature distribution non-uniformity parameter of each excitation winding;

[0060] Under each working condition, taking the range of the temperature data of all preset measurement points on each excitation winding as the second temperature distribution non-uniformity parameter of each excitation winding;

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

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

[0063] where i is the working condition serial number; k is the excitation winding serial number; Q i,k is the initial temperature distribution non-uniformity of the kth excitation winding under the ith working condition; σ i,k is the standard deviation of the temperature data of all preset measurement points on the kth excitation winding under the ith working condition; max{σ k} is the maximum standard deviation of the temperature data of all preset measurement points on the kth excitation winding under all working conditions; is the first temperature distribution non-uniformity parameter of the kth excitation winding under the ith working condition; T i,k,max is the maximum temperature data among the temperature data of all preset measurement points on the kth excitation winding under the ith working condition; T i,k,min is the minimum temperature data among the temperature data of all preset measurement points on the kth excitation winding under the ith working condition; T i,k,max -T i,k,min ) is the second temperature distribution non-uniformity parameter of the kth excitation winding under the ith working condition.

[0064] In the above formula, specifically, in the form of the ratio of the standard deviation to the maximum standard deviation, the standard deviation is normalized. The larger the standard deviation, the larger the normalized value, indicating that there are significant differences in the temperature data at different preset measurement points, and the larger the first temperature distribution non-uniformity parameter; at the same time, the larger the range, it also indicates that there are significant differences in the temperature data at different preset measurement points, and the larger the second temperature distribution non-uniformity parameter; finally, the two are multiplied and combined to obtain the initial temperature distribution non-uniformity.

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

[0066] Step S202, under each working condition, on each exciting winding, according to the temperature data and the location of each preset measurement point, respectively screen out the suspected short-circuit measurement points and the thermal radiation reference measurement points from all the preset measurement points; according to the spatial distance between the suspected short-circuit point and the reference measurement point, obtain the correction weight.

[0067] Considering that for the preset measurement points near the short circuit, their temperature data should be relatively lower than other measurement points. Therefore, in this example, first, based on the temperature data of the preset measurement points on the exciting winding, the suspected short-circuit measurement points are preliminarily screened out; also considering that the temperature data at each preset measurement point may also be affected by factors such as the thermal radiation of the surrounding turns and the heat dissipation efficiency of the location, and the temperature data of the preset measurement points in the middle section of the exciting winding are more affected by these factors, and the change in temperature data during short circuit is not easily recognized. Therefore, in this example, the thermal radiation reference measurement points most affected by thermal radiation are further screened out; if the suspected short-circuit measurement point is closer to the thermal radiation reference measurement point, it indicates that the confidence level of its initial temperature distribution non-uniformity is lower and needs further correction.

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

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

[0070] After obtaining the suspected short-circuit measurement points and the thermal radiation reference measurement points, the correction weight can be further obtained according to the spatial distance between the suspected short-circuit point and the thermal radiation reference measurement point.

[0071] As an example, the calculation formula for the correction weight is: where, i is the working condition serial number; k is the excitation winding serial number; P i,k is the correction weight of the initial temperature distribution unevenness of the k-th excitation winding under the i-th working condition; f() is a mapping function, and the value range of the mapping is from -1 to 1; p is the symbol of the suspected short-circuit point of the k-th excitation winding under the i-th working condition; q is the symbol of the thermal radiation reference measurement point of the k-th excitation winding under the i-th working condition; l i,k,p,q is the spatial distance between the suspected short-circuit point and the thermal radiation reference measurement point of the k-th excitation winding under the i-th working condition; max{l i,k,p} is the maximum spatial distance between the suspected short-circuit point and the remaining preset measurement points of the k-th excitation winding under the i-th working condition.

[0072] In the above formula, specifically, 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 from -1 to 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 level of the initial temperature distribution unevenness, the mapping result may take a negative value, and the correction weight is larger.

[0073] In other examples, the implementer 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 taking it as x in the exponential function exp(-x) with the natural constant e as the base, and then adding the constant 1 to the negative correlation normalization result to obtain the correction weight; the implementer can also adopt other negative correlation normalization means, which will not be elaborated here.

[0074] Step S203, weighting the initial temperature distribution unevenness by using the correction weight, and taking the normalization result of the weighting result as the temperature distribution unevenness.

[0075] As an example, specifically multiply and combine the correction weight and the initial temperature distribution unevenness, map the product into the sigmoid function for normalization, and take the normalization result as the temperature distribution unevenness; in other examples, the implementer can also adopt other normalization methods, which are all existing technologies and will not be elaborated here.

[0076] After obtaining the temperature distribution unevenness of each excitation winding under each working condition, the temperature distribution unevenness of all excitation windings under all working conditions can be further comprehensively analyzed and screened to identify the suspected short-circuit excitation windings.

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

[0078] Under each working condition, the exciting windings with a temperature distribution non-uniformity greater than a preset threshold are regarded as the initially screened suspected short-circuited exciting windings; among all the initially screened suspected short-circuited exciting windings under all working conditions, the initially screened suspected short-circuited exciting winding with the highest occurrence frequency is regarded as the suspected short-circuited exciting winding; the preset threshold is set to 0.7, and the implementer can also define it by himself.

[0079] Step S3, under each working condition, according to the temperature distribution non-uniformity of the suspected short-circuited exciting winding, combined with the temperature information and position distribution information of the remaining exciting windings, obtain the short-circuit coefficient of the suspected short-circuited exciting winding; at the current moment, according to the short-circuit coefficients of the suspected short-circuited exciting winding under all working conditions and the temperature change of the suspected short-circuited exciting winding under different working conditions, obtain the communication necessary coefficient of the generator short-circuit information.

[0080] Considering that there is also a certain thermal radiation effect between different exciting windings in the generator, when the suspected short-circuited exciting winding has a short circuit, its temperature will decrease relatively compared with other normally operating exciting windings, which will further cause the temperature of the adjacent exciting windings to decrease slightly, and the farther the remaining exciting windings are from the suspected short-circuited exciting winding, the lower the temperature impact on them; also considering that when some exciting windings in the generator are short-circuited, it may cause the exciting current to increase, resulting in an increase in the overall heat generation of the remaining exciting windings, and further making the temperature difference between the remaining normal exciting windings and the short-circuited exciting winding larger;

[0081] Based on this, the embodiment of the present invention will further obtain the short-circuit coefficient of the suspected short-circuited exciting winding under each working condition according to the temperature distribution non-uniformity of the suspected short-circuited exciting winding, further combined with the temperature information and position distribution information of the remaining exciting windings; the short-circuit coefficient reflects the degree of short-circuit fault of the suspected short-circuited exciting winding, and prepares for subsequent evaluation of the communication necessary coefficient of the generator short-circuit information to control communication transmission.

[0082] Preferably, in an embodiment of the present invention, considering the overall temperature change of the exciting resistance on the generator, it should generally satisfy the rule that the farther the exciting winding is from the suspected short-circuited exciting winding, the higher the overall temperature. Therefore, a sorting sequence can be constructed first based on this, and then analyze whether the overall temperature change of each exciting winding in the sorting sequence conforms to the above rule; the method for obtaining the short-circuit coefficient includes:

[0083] Sort all the exciting windings except the suspected short-circuited exciting winding according to the spatial distance between each exciting winding and the suspected short-circuited exciting winding, and obtain the sorting sequence;

[0084] Under each working condition, the temperature data of the reference measurement points on each exciting winding are used as the representative temperature; the differences between the representative temperatures of all adjacent exciting windings in the sorting sequence are normalized, and the mean value of the normalized values is used as the short-circuit reference weight.

[0085] The temperature distribution unevenness is weighted by the short-circuit reference weight, and the weighted result is used as the short-circuit coefficient of the suspected short-circuit exciting winding under the corresponding working condition.

[0086] As an example, all the exciting windings except the suspected short-circuit exciting winding are sorted in descending order of spatial distance to construct a sorting sequence; it should be noted that considering that different exciting windings in the generator are generally axially symmetric or centrosymmetric, there may be some exciting windings with the same spatial distance from the suspected short-circuit exciting winding during the process of sorting and constructing the sorting sequence. When sorting these exciting windings, the order does not need to be specified, but the exciting windings closer to the suspected short-circuit exciting winding must be ranked after the exciting windings farther from the suspected short-circuit exciting winding.

[0087] Then, under each working condition, the representative temperature of each exciting winding is obtained. The representative temperature reflects the overall temperature of each exciting winding indirectly; furthermore, the short-circuit reference weight is obtained. When the linear normalization value of all differences is larger, the mean value is also larger, indicating that it is more in line with the rule that the overall temperature of the exciting windings farther from the suspected short-circuit exciting winding is relatively higher, and at the same time, it also indirectly shows that the short-circuit influence degree of the suspected short-circuit exciting winding on other exciting windings is greater; finally, the short-circuit reference weight is multiplied and combined with the temperature distribution unevenness to obtain the short-circuit coefficient of the suspected short-circuit exciting winding under the corresponding working condition. The larger the short-circuit coefficient, the greater the short-circuit possibility and short-circuit influence of the suspected short-circuit exciting winding.

[0088] In other examples, the implementer can also use other means such as slope to evaluate the change of the overall temperature of the exciting windings in the sorting sequence, so as to obtain the short-circuit reference weight; the mean value or mode of the temperature data of all preset measurement points on the exciting winding can also be used as the representative temperature, which will not be elaborated here.

[0089] After obtaining the short-circuit coefficients of the suspected short-circuit exciting winding under all working conditions, at the current moment, by comprehensively considering the short-circuit performance of the suspected short-circuit exciting winding under different working conditions and further combining the temperature change of the suspected short-circuit exciting winding under different working conditions, the communication necessary coefficient of the generator short-circuit information can be obtained; the communication necessary coefficient indirectly reflects the degree of the fault and the short-circuit influence degree of the suspected short-circuit exciting winding at the current moment. The larger the communication necessary coefficient, the more urgently it should be communicated and transmitted to the power station management platform or the centralized control center to warn the relevant staff.

[0090] Preferably, in an embodiment of the present invention, considering that the range of the collected temperatures of the suspected short-circuited excitation winding under each working condition also preliminarily reflects the temperature change impact caused by the short circuit, the greater the range, the greater the degree of the short-circuit impact. Furthermore, the communication necessity coefficient of the short-circuit fault information of the suspected short-circuited excitation winding at the current moment can be evaluated by integrating the short-circuit impact degree information and the short-circuit coefficient under all working conditions. The method for obtaining the communication necessity coefficient includes:

[0091] Taking the mean value of the ranges of the collected temperatures of the suspected short-circuited excitation winding under different working conditions as the temperature change weight;

[0092] Using the temperature change weight to weight the mean value of the short-circuit coefficients of the suspected short-circuited excitation winding under all working conditions, and taking the normalized result of the weighted result as the communication necessity coefficient of the generator short-circuit information.

[0093] As an example, first, within the collection time period corresponding to each working condition, obtain the range of the collected temperatures of the suspected short-circuited excitation winding at all collection moments. The range reflects the degree of the short-circuit impact of the suspected short-circuited excitation winding under this working condition; then take the mean value of the ranges under all working conditions as the temperature change weight to comprehensively evaluate the temperature change of the suspected short-circuited excitation winding, which reflects the severity of the short circuit of the suspected short-circuited excitation winding within the preset historical period from the side;

[0094] Further calculate the mean value of the short-circuit coefficients of the suspected short-circuited excitation winding under all working conditions. The mean value of the short-circuit coefficients also reflects the severity of the short circuit of the suspected short-circuited excitation winding within the preset historical period; finally, multiply and combine the temperature change weight and the mean value of the short-circuit coefficients, and perform linear normalization on the product to obtain the communication necessity coefficient of the generator short-circuit information at the current moment.

[0095] In other examples, other normalization methods can also be adopted, and the acquisition of the range and the others are all prior arts and will not be elaborated.

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

[0097] After obtaining the communication necessity coefficient, the communication transmission of the fault data of the pumped-storage power station can be further controlled.

[0098] Preferably, in an embodiment of the present invention, when the communication necessity coefficient is greater than the preset coefficient threshold, a fault instruction is generated and communicated, that is, the instruction including the serial number of the suspected short-circuited excitation winding and its occurrence of a short-circuit fault is communicated to the power station management platform or the centralized control center to warn the relevant staff; when the communication necessity coefficient is less than or equal to the preset coefficient threshold, no communication transmission is performed; the preset coefficient is preset to 0.3, and the implementer can also define it by himself.

[0099] In another embodiment of the present invention, the implementer can also multiply the communication necessary coefficient of the generator short-circuit fault information at the current moment by the constant 10 to obtain the communication priority; then combine other monitoring means to evaluate whether there are other fault instructions such as mechanical failure of the water inlet valve, transformer failure, and too high water level in the reservoir at the current moment, which need to be communicated and transmitted to the power station management platform or the centralized control center for early warning, and then based on the pre-designed fault or early warning level table during the construction of the pumped-storage power station, 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, at the current moment, when multiple parts of the pumped-storage power station fail, such as mechanical failure of the water inlet valve and generator short-circuit failure occurring simultaneously, among which the fault or early warning level of the mechanical failure of the water inlet valve can be determined to be 6 by referring to the level table, then its communication priority is 6, while the communication priority of the generator short-circuit failure is 8. Then, the occurring faults are communicated and transmitted to the staff in the order of decreasing communication priority, that is, the instruction of the generator short-circuit failure is communicated and transmitted first, and then the instruction of the mechanical failure of the water inlet valve is communicated and transmitted, so as to relieve communication congestion and improve communication effect.

[0101] The present invention also provides 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, the present invention first obtains the temperature data of each preset measuring point on each excitation winding of the generator under different working conditions; then combines the position distribution of the preset measuring points to analyze and obtain the temperature distribution non-uniformity of each excitation winding under each working condition; further comprehensively analyzes and screens out the suspected short-circuited excitation windings under all working conditions; further analyzes and obtains the short-circuit coefficient of the suspected short-circuited excitation winding under each working condition, and then analyzes and obtains the communication necessary coefficient of the generator short-circuit information at the current moment, and controls the fault data communication transmission of the pumped-storage power station. The present invention combines the distribution of the excitation windings on the generator and the turn distribution density on the excitation windings, analyzes the temperature distribution information of each excitation winding in different power generation stages, and then comprehensively analyzes the temperature parts of the excitation windings in all power generation stages to accurately evaluate the possibility of its short-circuit fault to determine the communication necessity; through targeted communication and transmission of fault-related information, while reducing the communication burden, the fault loss is reduced.

[0103] It should be noted that: the above sequence of embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0104] Each embodiment in this specification is described in a progressive manner. For the same or similar parts among the embodiments, reference can be made to each other, and the key point of each embodiment is to illustrate the differences from other embodiments.

Claims

1. A data communication control method for a pumped storage power station, characterized in that: The method comprises: In the preset historical period at the current moment, the temperature data of each preset measuring point on each excitation winding of the generator under different working conditions are obtained; all the preset measuring points on each excitation winding are evenly spaced from one side of the pole shoe and distributed along the axial direction of the excitation winding; Under each working condition, the temperature distribution unevenness of each excitation winding is obtained according to the discreteness of the temperature data of all preset measuring points on each excitation winding and the position distribution of each preset measuring point; the temperature distribution unevenness of each excitation winding under all working conditions is comprehensively considered to screen out suspected short-circuited excitation windings from all excitation windings; Under each working condition, the short-circuit coefficient of the suspected short-circuited excitation winding is obtained according to the uneven temperature distribution of the suspected short-circuited excitation winding, combined with the temperature information and position distribution information of the remaining excitation windings; at the current moment, the communication necessary coefficient of the generator short-circuit information is obtained according to the short-circuit coefficient of the suspected short-circuited excitation winding under all working conditions and the temperature change of the suspected short-circuited excitation winding under different working conditions; The fault data communication transmission of the pumped storage power station is controlled according to the communication necessity coefficient.

2. A data communication control method for a pumped storage power station according to claim 1, characterized in that: The method for obtaining temperature data comprises: In the preset historical period of the current moment, the power of the generator at each moment is obtained, and the power is constructed into a power sequence according to the acquisition order; the absolute value of the difference value in the first-order difference sequence of the power sequence is taken to construct a first-order absolute difference sequence; the absolute value corresponding to the difference value less than the preset threshold in the first-order absolute difference sequence is used as the sequence number of the segmentation point, and the power sequence is segmented by using the segmentation point, and each segment corresponds to the acquisition period as a working condition corresponding period; In the corresponding period of each working condition, the average value of the collected temperature of each preset measuring point on each excitation winding at all collection times is used as the temperature data.

3. A data communication control method for a pumped storage power station according to claim 2, characterized in that: The method for obtaining the temperature distribution unevenness includes: Under each working condition, the initial temperature distribution unevenness of each excitation winding is obtained according to the standard deviation and range of the temperature data of all preset measuring points on each excitation winding; Under each working condition, on each excitation winding, according to the temperature data and the position of each preset measuring point, the suspected short-circuit measuring point and the thermal radiation reference measuring point are respectively screened out from all the preset measuring points; and the correction weight is obtained according to the spatial distance between the suspected short-circuit point and the reference measuring point; The initial temperature distribution non-uniformity is weighted by using the correction weight, and a normalized result of the weighted result is used as the temperature distribution non-uniformity.

4. A 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 unevenness includes: Under each working condition, a normalized result of the standard deviation of the temperature data of all preset measuring points on each excitation winding is used as a first temperature uneven distribution parameter of each excitation winding; Under each working condition, the range of the temperature data of all preset measuring points on each excitation winding is used as the second temperature uneven distribution parameter of each excitation winding; The product of the first temperature uneven distribution parameter and the second temperature uneven distribution parameter is used as the initial temperature uneven distribution degree 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 method for obtaining the suspected short-circuit point and the thermal radiation reference measurement point includes: Among all preset measuring points of each excitation winding, the preset measuring point with the smallest temperature data is taken as the suspected short-circuit point of the excitation winding; among all preset measuring points in the axial direction of the excitation winding, the preset measuring point located at the center is taken as the thermal radiation reference measuring 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 whose temperature distribution unevenness is greater than a preset threshold is taken as the initially screened suspected short-circuited excitation winding; among all the initially screened suspected short-circuited excitation windings under all operating conditions, the initially screened suspected short-circuited excitation winding with the highest frequency of occurrence is taken as the suspected short-circuited 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: According to the spatial distance between each excitation winding and the suspected short-circuited excitation winding, all excitation windings except the suspected short-circuited excitation winding are sorted and a sorting sequence is obtained; Under each working 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 average of the normalized values ​​is used as the short-circuit reference weight; The temperature distribution unevenness is weighted by using the short-circuit reference weight, and the weighted result is used as the short-circuit coefficient of the suspected short-circuited excitation winding under the corresponding working 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 necessary coefficient includes: The average of the extreme differences of the collected temperatures of the suspected short-circuited excitation winding under different operating conditions is used as the temperature change weight; the temperature change weight is used to weight the average of the short-circuit coefficients of the suspected short-circuited excitation winding under all operating conditions, and the normalized result of the weighted result is used as the necessary coefficient for communication of the 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 the communication transmission of fault data of the pumped storage power station comprises: When the communication necessary coefficient is greater than a preset coefficient threshold, a fault instruction is generated and communication is transmitted; when the communication necessary coefficient is less than or equal to the preset coefficient threshold, no communication transmission is performed.

10. A data communication control system for a pumped storage power station, characterized in that: It comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of a data communication control method for a pumped storage power station as described in any one of claims 1 to 9 are implemented.

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