Intelligent key management system and method for transformer substation

Abstract

The invention discloses an intelligent key management system and method for a transformer substation. The intelligent key management system for the transformer substation comprises an electronic key; a key cabinet module; the key cabinet module generates a secret key according to the voltage on the two sides of the power transformation equipment, and the secret key is written into the electronic key; and the unlocking module is deployed on each power transformation device, verifies the secret key according to the voltage at the two sides of the power transformation device, and unlocks the authority of the power transformation device. When a person takes the electronic key and specifies the power transformation equipment, the key cabinet module reads the voltage on the two sides of the power transformation equipment in the historical time period, generates a secret key and writes the secret key into the electronic key. After a person accesses an electronic key to the unlocking module, the unlocking module reads the voltages of the two sides of the power transformation equipment in the historical period and verifies the secret key of the electronic equipment. And the unlocking module provides one or more permissions of use, check, maintenance, data reading and the like of the power transformation equipment after judging that the secret key is verified to be correct.

Description

Technical Field

[0001] The present invention relates to the technical field of substation control, and in particular to a substation intelligent key management system and method. Background Art

[0002] With the continuous upgrading of substation management requirements, enterprises have higher and higher requirements for safe operation, lock management, and operation specifications. Intelligent management has become a trend that cannot be ignored. Key area operation specifications, operation process control specifications, and safe operation have become the core supervision focus, and their supporting specifications and control measures have gradually received attention.

[0003] With the continuous development of information technology, substations and important operating areas have higher and higher requirements for operational safety, operational specifications, and on-site control. Intelligent management of substations has become a trend that cannot be ignored. Key control and key usage specifications are an indispensable part of substations and other operating areas, and their management and control have gradually received attention.

[0004] The construction of the substation intelligent one-key access system (substation intelligent key management system) has brought new possibilities for the standardized control, safety control and digital control and management of substations. The system can not only prevent key fraud, operation specifications, equipment theft, but also prevent accidents caused by misoperation through intelligent management of lock boxes, locks, ladder control boxes, etc. The substation intelligent one-key access intelligent lock system management system can realize various management methods, and has functions such as switch lock records and automatic upload to the platform. Solve the problem of not knowing "when to open and who to open" the lock box and lock cabinet door. Its authorized unlocking method also improves the safety and standardization of the operation process. At the same time, through the collection, processing, statistics and analysis of system data, risk prediction and early warning can be carried out for the normal operation and safety management of equipment. Relying on a variety of analysis reports, it can also assist leadership decision-making and lay a solid foundation for intelligence.

[0005] The intelligent one-key access system for substations can not only improve the standardization and safety of operations, but also improve management efficiency, realize remote management and monitoring, and realize data recording and analysis. Therefore, in modern management, the intelligent one-key access system for substations has become one of the indispensable management tools, which can help substations achieve efficient, safe and reliable lock box, lock cabinet and key management, and improve the operational efficiency of substations. Summary of the invention

[0006] Based on this, a first aspect of an embodiment of the present invention discloses a substation smart key management system.

[0007] Wherein, the management system includes:

[0008] An electronic key storing a secret key;

[0009] a key cabinet module for storing the electronic key; the key cabinet module generates the key according to a voltage ratio signal of the primary side voltage and the secondary side voltage of the substation in a historical period, and the key cabinet module writes the key into the electronic key;

[0010] At least one unlocking module is respectively deployed in each of the substations. The unlocking module verifies the key according to the primary side voltage and the secondary side voltage of the substation and unlocks the authority of the substation.

[0011] The key cabinet module generates the key including:

[0012] Obtaining the primary side voltage and the secondary side voltage of the power transformation equipment in a historical period;

[0013] Acquire a voltage ratio signal within the historical period according to the primary side voltage and the secondary side voltage;

[0014] Using fast Fourier transform to obtain a frequency domain signal of the voltage ratio signal;

[0015] sorting the multiple frequency components of the frequency domain signal according to signal magnitude;

[0016] Selecting a number of the frequency components that are ranked later;

[0017] The key is generated based on a selected number of the frequency components.

[0018] The key cabinet module generates the key according to the frequency component, including:

[0019] Arrange the frequency components in order of frequency;

[0020] generating an input array according to the arranged frequency components;

[0021] Applying an encryption algorithm converts the input array into the key.

[0022] Wherein, the encryption algorithm is a symmetric encryption algorithm.

[0023] The key cabinet module generates the key including:

[0024] Obtain biometrics of applicants;

[0025] The key is generated according to the selected frequency components and the biometric feature.

[0026] The biometric features include one or more of the applicant's iris features, fingerprint features, palm print features, and pulse features.

[0027] The key cabinet module generates the key including:

[0028] Obtaining the primary side voltage and the secondary side voltage of the power transformation equipment in a historical period;

[0029] Acquire a voltage ratio signal within the historical period according to the primary side voltage and the secondary side voltage;

[0030] Using fast Fourier transform to obtain a frequency domain signal of the voltage ratio signal;

[0031] Clustering to obtain a number of high random frequency values ​​in the frequency domain signal;

[0032] The key is generated based on a number of the high randomness frequency values.

[0033] Wherein, clustering to obtain the high randomness frequency value includes:

[0034] A fuzzy C-means clustering algorithm is used to obtain a number of high random frequency values.

[0035] Wherein, the fuzzy C-means clustering algorithm is used,

[0036] ,

[0037] ;

[0038] in, is the cluster center of the jth category, N is the total number of frequencies, is the ith frequency, for The membership degree of class j, C is the number of clusters, m is the weight, represents the Euclidean distance from the i-th frequency to the j-th cluster center, represents the Euclidean distance from the i-th frequency to the k-th cluster center,

[0039] The value of C is 2, which is used to characterize the frequency categories of non-random and random occurrences.

[0040] A second aspect of an embodiment of the present invention discloses at least a substation smart key management method.

[0041] Wherein, the management method includes:

[0042] The key cabinet module generates the key according to the primary side voltage and the secondary side voltage of the power conversion equipment;

[0043] The key cabinet module writes the key into the electronic key;

[0044] The unlocking module verifies the key according to the primary side voltage and the secondary side voltage of the power conversion device, and unlocks the authority of the power conversion device according to the verification result.

[0045] In view of the above-mentioned solution, the present invention describes the disclosed exemplary embodiments in detail below with reference to the accompanying drawings, so that other features and advantages of the embodiments of the present invention are also made clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0047] Figure 1 This is a schematic diagram of the structure of the substation intelligent key management system of this embodiment.

[0048] Figure 2 A schematic diagram of a process for generating a key by the controller in this embodiment.

[0049] Figure 3 The figure is a flow chart of the controller in this embodiment generating a key according to frequency components.

[0050] Figure 4 Another schematic diagram of a flow chart of the controller generating a key in this embodiment.

[0051] Figure 5 Schematic diagram of the process of the substation intelligent key management method of this embodiment. DETAILED DESCRIPTION

[0052] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The drawings provide embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0054] It is understood that spatial relational terms such as "under", "beneath", "below", "under", "above", "above", etc., may be used herein to describe the relationship of one element and / or feature to other elements and / or features shown in the figures. It should be understood that the spatial relational terms also include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the figures is turned over, the elements and / or features described as "under other elements" and / or "beneath" and / or "beneath" will be oriented "above" the other elements and / or features. Therefore, the exemplary terms "under" and "under" can include both the above and below orientations. In addition, the device can also include additional orientations (e.g., rotated 90 degrees and / or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0055] When used herein, the singular forms "a", "an" and " / the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" and / or "have" etc. specify the storage of stated features, wholes, steps, operations, components, parts and / or combinations thereof, but do not exclude the possibility of storing and / or adding one and / or more other features, wholes, steps, operations, components, parts and / or combinations thereof.

[0056] This embodiment discloses a substation intelligent key management system.

[0057] Figure 1 A schematic diagram of the structure of the substation intelligent key management system of this embodiment is shown.

[0058] The management system includes a plurality of electronic keys, a key cabinet module and a plurality of unlocking modules.

[0059] The electronic key is configured as a readable and writable electronic device having a first physical interface, which is used to connect with a second physical interface of the key cabinet module and establish a first communication link.

[0060] The key cabinet module can write the key into the electronic key through the first communication link. The electronic key retains the key for a period of time, and when the electronic key establishes a communication link with another device, it verifies the other device and sends the retained key to the verified other device.

[0061] The key cabinet module includes a key cabinet and a controller. The key cabinet is used to store a plurality of electronic keys, and a device for identity information verification is configured on the door of the key cabinet to log the identity of the person who uses the electronic key. The controller is configured with a second physical interface, which is used to connect with the first physical interface of the plurality of electronic keys and establish a first communication link.

[0062] Furthermore, the controller communicates with several substation equipment in the substation area and obtains the primary side voltage and the secondary side voltage of the substation equipment in real time. The controller can generate a key according to the primary side voltage and the secondary side voltage in a historical period.

[0063] Several unlocking modules are respectively matched with the substation equipment. The unlocking module acts as a lock to directly block one or more permissions of the substation equipment, such as use, viewing, maintenance, data reading, etc. The unlocking module is the same as the controller. It verifies the key according to the primary side voltage and secondary side voltage of the corresponding historical period, and unlocks one or more permissions of the substation equipment according to the verification result.

[0064] Figure 2 A schematic diagram of a process of generating a key by the controller in this embodiment is shown.

[0065] Figure 2 It is shown that the controller generates a key including the following steps.

[0066] 110 Obtain the primary side voltage and secondary side voltage of the substation equipment in a historical period.

[0067] Among them, the primary side voltage refers to the voltage connected to the transmission line, usually the voltage of the incoming line (high-voltage side). In the power system, the primary side is the high-voltage side. The electricity generated by the power plant is generally 10KV-15KV, which is increased to a high voltage of several hundred KV by the transformer to meet the needs of long-distance power transmission. The primary side voltage generally contains inevitable noise, and the noise sources mainly include the eddy current effect of the current, the vibration of the wire, the vibration of the metal structure, etc. Specifically, on the high-voltage transmission line, the flow of current will form a magnetic field, and this magnetic field will produce a periodic eddy current effect on the wire, causing the wire to vibrate. This vibration will generate noise, and its frequency is related to the current frequency. The wires of the high-voltage transmission line will vibrate under the action of wind or when disturbed by external forces, thereby generating noise. The frequency of wire vibration is related to wind speed and wire tension. The metal structure of the high-voltage transmission line will also vibrate under the impact of current or wind, thereby generating noise. The frequency of this vibration is related to factors such as the structure, material and wind force of the structure. During the command and dispatch process of high-voltage transmission lines, the operation of the switching power supply will generate noise, thus causing noise pollution to the surrounding environment.

[0068] And, the secondary side voltage refers to the voltage connected to the equipment, usually refers to the voltage of the line (low voltage side). In the power system, the secondary side is the low voltage side. The secondary side voltage generally contains inevitable noise, and the noise sources mainly include switching tubes and rectifiers, parasitic capacitance inside the power supply, and changes in component characteristics. Specifically, switching tubes and rectifiers refer to the radio frequency energy generated by the large current changes of switching tubes and rectifiers during the on and off conversion process, which becomes the main source of noise. The parasitic capacitance inside the power supply refers to the parasitic capacitance inside the switching power supply that suddenly charges and discharges in the switching state, generating noise. These capacitors include transformer parasitic capacitance, capacitance between semiconductor devices and heat sinks, and capacitance between wires and racks. Changes in component characteristics refer to the fact that when the switching power supply operates at a higher frequency, the characteristics of low-frequency components change, thereby generating noise.

[0069] 120 obtains a voltage ratio signal within a historical period according to the primary side voltage and the secondary side voltage.

[0070] The primary side voltage and the secondary side voltage are combined into a voltage ratio signal. The voltage ratio signal is an analog signal that can characterize the signal values ​​and fluctuations of the primary side voltage and the secondary side voltage at any time period.

[0071] Preferably, in combination with the possible interference to the primary side voltage and / or the secondary side voltage in different scenarios, when obtaining the voltage ratio signal, the weight of the primary side voltage or the secondary side voltage can be increased according to the interference in different scenarios to amplify or suppress the influence of the primary side voltage or the secondary side voltage in the voltage ratio signal.

[0072] 130 Fast Fourier transform is used to obtain the frequency domain signal of the voltage ratio signal.

[0073] Among them, the Fast Fourier Transform (FFT) is used to calculate the Discrete Fourier Transform (DFT), which converts the analog voltage ratio signal from the time domain to the frequency domain to obtain a frequency domain signal. Some frequency components of the frequency domain signal are used to characterize the primary side voltage / secondary side voltage obtained through the transformer winding, and some frequency components are used to characterize the noise of the primary side voltage / secondary side voltage.

[0074] 140 Sort multiple frequency components of the frequency domain signal according to signal size.

[0075] Among them, the frequency components ranked first are the main signals of the primary side voltage and the secondary side voltage, that is, the primary side voltage / secondary side voltage. The frequency components ranked last are noise signals, that is, the noise of the primary side voltage / the noise of the secondary side voltage.

[0076] 150 Select several frequency components that are sorted later.

[0077] Among them, the frequency components ranked later are mainly related to the noise of the primary and secondary voltages. The noise of the primary and secondary voltages is related to the characteristics of the substation equipment and the transmission line, cannot be easily obtained, has randomness, and is suitable for key generation.

[0078] 160 Generate a key based on a selected number of frequency components.

[0079] Among them, using several frequency components sorted at the end to generate a key can ensure that the key is related to one and only one substation equipment and cannot be obtained externally.

[0080] Preferably, the key cabinet module generates the key in step 160 by acquiring the biometric characteristics of the applicant, the biometric characteristics including one or more of the applicant's iris characteristics, fingerprint characteristics, palm print characteristics, and pulse characteristics, and generating the key according to the selected frequency components and the biometric characteristics.

[0081] Figure 3 A schematic diagram of a process of the controller generating a key according to the frequency components in step 160 is shown.

[0082] Figure 3 It is shown that the controller generates a key including the following steps.

[0083] 161 Arrange the selected frequency components according to their frequency.

[0084] 162 Generates the input array based on the permuted frequency components.

[0085] 163 Apply the encryption algorithm to convert the input array into a key.

[0086] Preferably, the encryption algorithm is a symmetric encryption algorithm, such as ‌DES, 3DES, AES, RC4, etc. Among them, DES is a data encryption standard algorithm. 3DES is a triple data encryption algorithm, which is an improvement on DES. It uses three different keys for three encryptions to improve security. AES is an advanced encryption standard algorithm, which is the most widely used symmetric encryption algorithm at present. It is safer and more efficient than DES and 3DES. RC4 is a stream encryption algorithm.

[0087] Furthermore, RC4 is suitable for scenarios requiring high-speed encryption. In this embodiment, RC4 can be selected as the key generation algorithm for the input array in step 163.

[0088] Figure 4 Another schematic diagram of a flow chart of the controller generating a key in this embodiment is shown.

[0089] Figure 4 It is shown that the controller generates a key including the following steps.

[0090] 210 obtains the primary side voltage and the secondary side voltage of the substation equipment in a historical period.

[0091] 220 obtains a voltage ratio signal within a historical period according to the primary side voltage and the secondary side voltage.

[0092] 230 uses fast Fourier transform to obtain the frequency domain signal of the voltage ratio signal.

[0093] 240 Clustering obtains several high random frequency values ​​in the frequency domain signal.

[0094] 250 Generate a key based on several high random frequency values.

[0095] in, Figure 3 In step 250, clustering to obtain high random frequency values ​​includes:

[0096] The fuzzy C-means clustering algorithm is used to obtain several high random frequency values.

[0097] Specifically, the fuzzy C-means clustering algorithm includes:

[0098] ,

[0099] ;

[0100] in, is the cluster center of the jth category, N is the total number of frequencies, is the ith frequency, for The membership degree of class j, C is the number of clusters, m is the weight, represents the Euclidean distance from the i-th frequency to the j-th cluster center, It represents the Euclidean distance from the ith frequency to the kth cluster center. The value of C is 2, which is used to characterize the frequency categories of non-random and random occurrences.

[0101] Preferably, in this embodiment, the frequency of the main signal and the frequency of the noise signal are clustered, and the frequency of the noise signal obtained by clustering is directly used as the key.

[0102] Preferably, in step 250, an improved fuzzy C-means clustering algorithm may be used to obtain a number of high random frequency values.

[0103] Alternatively, when generating a key, it is also possible to consider applying an encryption algorithm to convert the frequency of the noise signal obtained by clustering into a key.

[0104] Alternatively, after step 220, the signal feature of the voltage ratio signal is extracted to directly obtain the signal feature for generating the key.

[0105] For example, the voltage ratio signal is first subjected to a stationary wavelet transform and decomposed to obtain wavelet coefficients of each layer. The wavelet detail coefficients of each layer are processed to obtain wavelet coefficients that remove noise signals, and the wavelet coefficients are reconstructed to obtain non-noise signals. The reconstructed non-noise signal is discarded from the voltage ratio signal to obtain a noise signal. The noise signal is then smoothed using a wavelet correlation denoising algorithm to obtain a noise signal that is recognizable and clear enough. The noise signal is independent of the main signal in the voltage ratio signal and can be used to generate a key.

[0106] Then, in the controller of this embodiment, when a person takes the electronic key and specifies the substation to be repaired or checked, the controller reads the primary and secondary voltages of the substation in a historical period, generates a key based on the primary and secondary voltages, and then writes the key to the electronic key. After the person connects the electronic key to the unlocking module, the unlocking module reads the primary and secondary voltages of the matching substation in the historical period and verifies the key of the electronic device. After determining that the key verification is correct, the unlocking module provides one or more permissions such as use, viewing, repair, and data reading of the substation. When external personnel cannot obtain the voltage data of the substation, keys of any permissions cannot be generated outside the controller.

[0107] Furthermore, the substation equipment can be set with multiple different permissions to respectively deal with the use, viewing, maintenance, data reading, etc. of the substation equipment by personnel. Then when the controller generates a key or the unlocking module verifies the key, the keys corresponding to different historical periods of the current time can correspond to different permissions.

[0108] The invention discloses a substation intelligent key management method.

[0109] Figure 5 A flow chart of a substation intelligent key management method is shown.

[0110] Figure 5 It is shown that the management method of this embodiment includes the following steps.

[0111] The 310 key cabinet module generates a key according to the primary and secondary voltages of the substation equipment.

[0112] The 320 key cabinet module writes the key to the electronic key.

[0113] The unlocking module 330 verifies the key according to the primary side voltage and the secondary side voltage of the substation, and unlocks the authority of the substation according to the verification result.

[0114] Through the above description of the implementation method, technical personnel in the relevant field can clearly understand that the present invention can be implemented with the help of software and necessary general-purpose hardware, and of course can also be implemented through hardware, but in many cases the former is a better implementation method.

[0115] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A substation intelligent key management system, characterized in that: The management system comprises: Electronic key, storing secret key; a key cabinet module for storing the electronic key; the key cabinet module generates the key according to a voltage ratio signal of the primary side voltage and the secondary side voltage of the substation in a historical period, and the key cabinet module writes the key into the electronic key; At least one unlocking module is respectively deployed in each of the substations. The unlocking module verifies the key according to the primary side voltage and the secondary side voltage of the substation and unlocks the authority of the substation.

2. The substation intelligent key management system according to claim 1, characterized in that: The key cabinet module generates the key including: Obtaining the primary side voltage and the secondary side voltage of the power transformation equipment in a historical period; Acquire a voltage ratio signal within the historical period according to the primary side voltage and the secondary side voltage; Using fast Fourier transform to obtain a frequency domain signal of the voltage ratio signal; sorting the multiple frequency components of the frequency domain signal according to signal magnitude; Selecting a number of the frequency components that are ranked later; The key is generated based on a selected number of the frequency components.

3. The substation intelligent key management system according to claim 2, characterized in that: The key cabinet module generates the key according to the frequency component, comprising: Arrange the frequency components in order of frequency; generating an input array according to the arranged frequency components; Applying an encryption algorithm converts the input array into the key.

4. The substation intelligent key management system according to claim 3, characterized in that: The encryption algorithm is a symmetric encryption algorithm.

5. The substation intelligent key management system according to claim 2, characterized in that: The key cabinet module generates the key including: Obtain biometrics of applicants; The key is generated according to the selected frequency components and the biometric feature.

6. The substation intelligent key management system according to claim 5, characterized in that: The biometric feature includes one or more of the applicant's iris feature, fingerprint feature, palm print feature, and pulse feature.

7. The substation intelligent key management system according to claim 1, characterized in that: The key cabinet module generates the key including: Obtaining the primary side voltage and the secondary side voltage of the power transformation equipment in a historical period; Acquire a voltage ratio signal within the historical period according to the primary side voltage and the secondary side voltage; Using fast Fourier transform to obtain a frequency domain signal of the voltage ratio signal; Clustering to obtain a number of high random frequency values ​​in the frequency domain signal; The key is generated based on a number of the high randomness frequency values.

8. The substation intelligent key management system according to claim 7, characterized in that: The high random frequency values ​​obtained by clustering include: A number of high random frequency values ​​are obtained.

9. The substation intelligent key management system according to claim 8, characterized in that: The fuzzy C-means clustering algorithm is used to include: ， ； in, is the cluster center of the jth category, N is the total number of frequencies, is the ith frequency, for The membership degree of class j, C is the number of clusters, m is the weight, represents the Euclidean distance from the i-th frequency to the j-th cluster center, represents the Euclidean distance from the i-th frequency to the k-th cluster center, The value of C is 2, which is used to characterize the frequency categories of non-random and random occurrences.

10. A substation smart key management method, using the substation smart key management system as claimed in claim 1, characterized in that: The management method includes, The key cabinet module generates the key according to the voltage ratio signal of the primary side voltage and the secondary side voltage of the power conversion equipment in a historical period; The key cabinet module writes the key into the electronic key; The unlocking module verifies the key according to the primary side voltage and the secondary side voltage of the power conversion device, and unlocks the authority of the power conversion device according to the verification result.

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