A timing method and system for power grid system based on Beidou satellite

Abstract

The present invention discloses a timing method and system for a power grid system based on Beidou satellite, which relates to the technical field of timing for power grid systems, and includes the following steps: using the Beidou ground control center to obtain Beidou satellite signals and generate time and frequency reference signals; transmitting the time and frequency reference signals to nodes at all levels through the communication network of the power system; deploying a Beidou timing processing module in the local equipment of the power system to process the received time and frequency reference signals and generate a system clock signal consistent with the Beidou satellite time reference. The present invention forms a triple guarantee through Beidou satellite signals and a dual-channel transmission architecture, namely, an optical fiber channel and a power line carrier channel; when any transmission channel fails, the redundant switching module automatically selects the optimal path, namely, triggers switching through a delay deviation>threshold, and starts a hierarchical timekeeping strategy (atomic clock→adjacent node synchronization→power frequency synchronization) after the Beidou signal is interrupted.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid system timing, and in particular to a power grid system timing method and system based on Beidou satellite. Background Art

[0002] In the power system, accurate time synchronization is one of the key factors to ensure stable operation and efficient management of the system. Traditional timing methods often rely on a single time source. If the time source fails or is disturbed, the timing function of the entire system may be affected, and there is a single-point synchronization risk. Secondly, when using Beidou satellite navigation timing technology, it is necessary to make a lot of changes to the network structure in the communication network and frequency standard network of the power system, which will lead to a sharp increase in the cost of operation. Summary of the invention

[0003] In view of the problems existing in the existing Beidou satellite-based power grid system timing and system, the present invention is proposed.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] In a first aspect, an embodiment of the present invention provides a Beidou satellite-based power grid system timing method, which includes the following steps:

[0006] Use the Beidou ground control center to obtain Beidou satellite signals and generate time and frequency reference signals;

[0007] Transmitting the time and frequency reference signal to nodes at all levels through the communication network of the power system;

[0008] The Beidou timing processing module is deployed in the local equipment of the power system to process the received time and frequency reference signal and generate a system clock signal consistent with the Beidou satellite time reference.

[0009] As a preferred solution of the Beidou satellite-based power grid system timing method of the present invention, the step of processing the received time and frequency reference signal includes:

[0010] The transmission delay of each node is dynamically calculated through the power network topology structure, and the time and frequency reference signal is corrected using an adaptive delay compensation algorithm;

[0011] The corrected signal is input into the disciplined clock module, and the phase of the local crystal oscillator and the Beidou satellite time reference are locked through an algorithm.

[0012] As a preferred solution of the Beidou satellite-based power grid system timing method of the present invention, wherein: the communication network adopts a dual-channel transmission architecture consisting of an optical fiber channel and a power line carrier channel;

[0013] A time tag comparison mechanism is set at the transmission layer. When the time deviation between two channels exceeds the preset threshold, the redundant switching module is triggered to automatically select the transmission channel with the smallest delay.

[0014] As a preferred solution of the Beidou satellite-based power grid system timing method of the present invention, it also includes deploying a security protection module in the local terminal equipment.

[0015] The security protection module includes: an anti-spoofing and interference unit based on Beidou signal feature recognition, a timing signal encryption unit using a national secret algorithm, and an illegal access detection unit based on the power system topology structure;

[0016] The encryption unit performs quantum key distribution encryption on the time frequency reference signal at the physical layer.

[0017] As a preferred solution of the Beidou satellite-based power grid system timing method of the present invention, the adaptive delay compensation algorithm performs the following steps:

[0018] A node transmission delay model is established based on the power network topology structure, which is specifically expressed as follows:

[0019] ;

[0020] In the formula, is the link length, is the signal propagation speed, is the queue delay, is the link bandwidth, is the node transmission delay, N is the total number of links;

[0021] Obtaining actual transmission delay through online monitoring ;

[0022] Calculate the compensation factor. The specific calculation formula is expressed as:

[0023] ;

[0024] In the formula, is the compensation factor;

[0025] Apply the time-frequency reference signal times gain compensation.

[0026] As a preferred solution of the Beidou satellite-based power grid system timing method of the present invention, the security protection module further includes a dynamic baseline detection unit, wherein the dynamic baseline detection unit performs the following steps:

[0027] Establish a BeiDou signal characteristics baseline database;

[0028] Real-time monitoring of the deviation between signal parameters and Beidou signal characteristic baseline ;

[0029] when >3, an alarm is triggered and a preset safe clock signal is injected;

[0030] Among them, the deviation The calculation formula is:

[0031] ;

[0032] In the formula, is the actual signal parameter value, indicating the currently monitored signal parameter value. is the mean value of the baseline signal parameter, indicating the average value of the signal parameter under normal circumstances, is the standard deviation of the baseline signal parameter, indicating the fluctuation range of the signal parameter under normal circumstances; n is the number of signal parameters, indicating the number of monitored signal parameters.

[0033] In a second aspect, an embodiment of the present invention provides a Beidou satellite-based power grid system timing system, which includes a Beidou ground control center, a power system communication network, and a Beidou timing processing module;

[0034] The Beidou ground control center is used for signal reception and processing, and generating reference signals;

[0035] The power system communication network is used for signal transmission and is also adapted for network adaptation and dynamic compensation;

[0036] The Beidou timing processing module is used for signal processing and clock synchronization.

[0037] As a preferred solution of the Beidou satellite-based power grid system timing system of the present invention, it also includes a safety protection module;

[0038] The security protection module includes an anti-spoofing interference unit, a timing signal encryption unit, an illegal access detection unit, and a dynamic baseline detection unit;

[0039] The anti-spoofing interference unit detects and resists attacks of forged Beidou signals based on Beidou signal feature recognition technology to prevent timing spoofing;

[0040] The timing signal encryption unit uses a national secret algorithm to encrypt the time frequency reference signal, and introduces quantum key distribution technology at the physical layer to ensure the confidentiality and integrity of the timing signal;

[0041] The illegal access detection unit detects abnormal access behavior based on the power system topology to prevent illegal devices from accessing the power grid timing network;

[0042] The dynamic baseline detection unit establishes a Beidou signal feature baseline database and records the mean and standard deviation of signal parameters under normal circumstances.

[0043] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, any step of the above-mentioned Beidou satellite-based power grid system timing method is implemented.

[0044] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned Beidou satellite-based power grid system timing method is implemented.

[0045] The beneficial effects of the present invention are:

[0046] The Beidou satellite signal and dual-channel transmission architecture, namely the optical fiber channel and the power line carrier channel, form a triple guarantee. When any transmission channel fails, the redundant switching module automatically selects the optimal path, that is, the switching is triggered by the delay deviation > threshold. After the Beidou signal is interrupted, the hierarchical timekeeping strategy (atomic clock → adjacent node synchronization → power frequency synchronization) is started. The dynamic baseline detection unit detects the deviation of the >3, a preset secure clock is injected. Therefore, during 30 days of continuous operation, the system availability reaches 99.9997%, which is 2 orders of magnitude higher than the traditional single-source timing.

[0047] By running the adaptive delay compensation algorithm, the cost of transformation can be reduced. For example, in an unmodified 10kV distribution network, the timing accuracy can still reach 50ns, which reduces the need for line transformation by 85% compared with the traditional Beidou timing solution. Compared with the large-scale transformation of the network structure in the communication network and frequency standard network of the power system, this method only requires corresponding transformation on the local equipment to complete the communication and timing of Beidou satellites in the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0049] Figure 1 The figure is a flow chart of the timing method for the Beidou satellite-based power grid system. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0051] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0053] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0054] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Embodiment 1:

[0057] Reference Figure 1, which is the first embodiment of the present invention, and provides a timing method for a power grid system based on Beidou satellite, comprising the following steps:

[0058] S1. Use the Beidou ground control center to obtain Beidou satellite signals and generate time and frequency reference signals.

[0059] The Beidou ground control center is the core source of the timing method of the present invention. Its function is to generate a high-precision and high-stability time and frequency reference signal (1PPS second pulse + 10MHz frequency signal) by receiving Beidou satellite signals, providing a unified time reference for the power system.

[0060] Multi-band antenna array: Deploy multi-mode receiving antennas that support the BeiDou-3 B1 (1561.098MHz), B2 (1207.14MHz), and B3 (1268.52MHz) frequency bands to enhance the ability to resist multipath interference.

[0061] High-performance receiver: Adopts four-channel parallel receiver, supports carrier phase observation value acquisition, sampling frequency ≥100Hz, code phase resolution ≤0.1ns.

[0062] Atomic clock group: equipped with cesium atomic clocks and hydrogen atomic clocks as ground time reference sources.

[0063] When generating a time base, the following two methods can be used:

[0064] Phase synchronization: The Beidou satellite time (BDT) is compared with the ground atomic clock group time, and a 1PPS second pulse signal is generated through a phase-locked loop (PLL), with a synchronization accuracy of ≤5ns.

[0065] Or use the second method, frequency taming: use the ambiguity fixing algorithm to perform closed-loop control on the 10MHz frequency signal of the ground atomic clock and the Doppler frequency shift of the Beidou satellite signal.

[0066] S2. Transmitting the time and frequency reference signal to nodes at all levels through the communication network of the power system.

[0067] First of all, it is important to know that the power system communication network has a wide coverage and complex environment (such as electromagnetic interference in substations and the risk of optical fiber breakpoints in mountainous areas), and it is necessary to ensure the high reliability of transmission of time and frequency reference signals. This embodiment uses a dual-channel redundant architecture of optical fiber and power line carrier (PLC) combined with dynamic delay compensation to solve the problem of single channel failure and transmission delay fluctuation.

[0068] The communication network adopts a dual-channel transmission architecture consisting of optical fiber channel and power line carrier channel;

[0069] A time tag comparison mechanism is set at the transmission layer. When the time deviation between two channels exceeds the preset threshold, the redundant switching module is triggered to automatically select the transmission channel with the smallest delay.

[0070] In an optional embodiment, the dual-channel network architecture design includes a fiber channel and a power line carrier channel. The fiber channel adopts an SDH (Synchronous Digital Hierarchy) ring network with a transmission rate of ≥2.5Gbps and a delay of ≤1ms / 100km. OTN (Optical Transport Network) equipment is deployed to support IEEE1588v2 Precision Time Protocol (PTP) to achieve timestamp transparent transmission. The power line carrier channel uses 10kV distribution cables, adopts OFDM (Orthogonal Frequency Division Multiplexing) modulation technology, has a carrier frequency range of 2-12MHz, and deploys PLC couplers and filters to suppress harmonic noise (signal-to-noise ratio ≥30dB).

[0071] S3. Deploy the Beidou timing processing module in the local equipment of the power system to process the received time and frequency reference signal and generate a system clock signal consistent with the Beidou satellite time reference.

[0072] The step of processing the received time-frequency reference signal comprises:

[0073] The transmission delay of each node is dynamically calculated through the power network topology structure, and the time and frequency reference signal is corrected using an adaptive delay compensation algorithm;

[0074] The adaptive delay compensation algorithm performs the following steps:

[0075] A node transmission delay model is established based on the power network topology structure, which is specifically expressed as follows:

[0076] ;

[0077] In the formula, is the link length, is the signal propagation speed, is the queue delay, is the link bandwidth, is the node transmission delay, N is the total number of links;

[0078] In this embodiment, the following parameters are obtained: time accuracy: 1μs (TTL active pulse output); data acquisition time: restart after momentary power failure ≤2min, restart without position change ≤2min, restart with position and time change ≤20min, first local startup ≤20min; position accuracy: ±0.1′; signal input: Beidou signal, GPS signal and B code signal; power supply: AC85V~265VorDC100V~360V; power consumption: no more than 72W.

[0079] The Beidou timing processing module receives the time synchronization signal from Beidou satellites or GPS satellites, as well as the B code signal. The module processes the received signal, including signal capture, tracking and resolution, to generate a high-precision time signal. The time signal is synchronized to various automation devices and systems in the power system through a serial interface (such as RS232, RS422 / 485) or a network interface (such as NTP / SNTP).

[0080] The module can output a variety of time synchronization signals, including timing pulses, IRIG-B codes, serial port time messages, network time messages, etc. The actual transmission delay is obtained through online monitoring, the compensation factor is calculated, and the time frequency reference signal is compensated to ensure the accuracy of time synchronization.

[0081] Obtaining actual transmission delay through online monitoring ;

[0082] Calculate the compensation factor. The specific calculation formula is expressed as:

[0083] ;

[0084] In the formula, is the compensation factor;

[0085] Apply the time-frequency reference signal times gain compensation.

[0086] The corrected signal is input into the disciplined clock module, and the phase of the local crystal oscillator and the Beidou satellite time reference is locked through the Kalman filter algorithm;

[0087] The tamed synchronization error is less than 100 nanoseconds.

[0088] When in use, the processor is programmed to read the corrected signal data from the Beidou signal receiver in real time. The data contains timestamps and related signal feature information. The algorithm program is written in the processor according to the five steps of Kalman filtering (initialization, prediction, update covariance, measurement update, and update status). The phase of the local crystal oscillator is predicted and corrected using the historical local crystal oscillator phase data and the currently received Beidou signal time reference information. For example, the state variables are set to the phase and frequency deviation of the local crystal oscillator, and the phase of the local crystal oscillator is gradually approached to the phase of the Beidou satellite time reference through continuous iterative calculations.

[0089] According to the correction value calculated by the Kalman filter algorithm, the control parameters of the local crystal oscillator are adjusted to achieve the taming of the local crystal oscillator. The synchronization error is continuously monitored. When the tamed synchronization error is greater than 100 nanoseconds, continue to adjust until the error is less than 100 nanoseconds.

[0090] It also includes deploying security protection modules on the local equipment.

[0091] The security protection module includes: an anti-spoofing and interference unit based on Beidou signal feature recognition, a timing signal encryption unit using a national secret algorithm, and an illegal access detection unit based on the power system topology structure;

[0092] The encryption unit performs quantum key distribution encryption on the time frequency reference signal at the physical layer.

[0093] The anti-spoofing interference unit identifies and distinguishes real signals from spoofing signals by analyzing the characteristics of Beidou signals, such as signal strength, code phase, navigation messages, etc. A multi-level detection mechanism is adopted, including signal strength detection, correlation peak number detection, correlation peak distortion detection, navigation message consistency detection, positioning residual consistency detection, and clock error model consistency detection. Once a spoofing signal is detected, it is immediately isolated to ensure the security and reliability of the timing system.

[0094] The encryption unit uses national secret algorithms (such as SM2, SM3, and SM4) to encrypt the timing signal to ensure the security of the signal during transmission. Quantum key distribution is performed on the time and frequency reference signal at the physical layer, and the characteristics of quantum mechanics are used to ensure the security of the key. The keys generated by quantum key distribution are dynamically updated and managed to ensure the randomness and security of the keys.

[0095] The illegal access detection unit builds node and link models based on the topological structure of the power system and monitors the data flow and connection status in the network in real time. By monitoring abnormal traffic and connections in the network, it identifies and blocks illegal access behaviors to ensure the security and stability of the system. Once illegal access is detected, the alarm mechanism is immediately triggered and corresponding security measures are taken, such as isolating illegal access points and notifying administrators.

[0096] The security protection module further includes a dynamic baseline detection unit, wherein the dynamic baseline detection unit performs the following steps:

[0097] Establish a BeiDou signal characteristics baseline database;

[0098] Real-time monitoring of the deviation between signal parameters and Beidou signal characteristic baseline ;

[0099] when >3, an alarm is triggered and a preset safe clock signal is injected;

[0100] Among them, the deviation The calculation formula is:

[0101] ;

[0102] In the formula, is the actual signal parameter value, indicating the currently monitored signal parameter value. is the mean value of the baseline signal parameter, indicating the average value of the signal parameter under normal circumstances, is the standard deviation of the baseline signal parameter, indicating the fluctuation range of the signal parameter under normal circumstances; n is the number of signal parameters, indicating the number of monitored signal parameters.

[0103] In this embodiment, under normal operating conditions, multiple parameters of Beidou signals are collected, including signal strength, code phase, navigation message content, etc. The collected signal parameters are statistically analyzed to calculate the mean and standard deviation of each parameter. The calculated mean and standard deviation are stored in the baseline database as a reference for subsequent monitoring.

[0104] What you need to know is: according to the 3σ principle of statistics (that is, in a normal distribution, about 99.73% of the data falls within the range of the mean ± 3 times the standard deviation), when the deviation exceeds 3, it means that the currently monitored signal parameters deviate from the normal baseline to a large extent, which is a low-probability event and it is very likely that an abnormal situation has occurred.

[0105] If a number less than 3 is selected as the threshold, for example, 2, the alarm will be triggered too frequently because the alarm may be triggered even within the normal signal fluctuation range, resulting in an increase in the false alarm rate and unnecessary processing burden.

[0106] If a number greater than 3 is selected as the threshold, such as 4, the system will not be sensitive enough to real abnormal signals, and some important abnormal situations may be missed, and potential safety issues cannot be discovered and handled in time, reducing the safety and reliability of the system.

[0107] Therefore, the deviation threshold adopted in this scheme is 3.

[0108] In summary, the Beidou satellite signal and dual-channel transmission architecture, namely the optical fiber channel and the power line carrier channel, form a triple guarantee; when any transmission channel fails, the redundant switching module automatically selects the optimal path, that is, the switching is triggered by the delay deviation > threshold, and the hierarchical timekeeping strategy (atomic clock → adjacent node synchronization → power frequency synchronization) is started after the Beidou signal is interrupted. The dynamic baseline detection unit detects the deviation of the >3, a preset secure clock is injected. Therefore, during 30 days of continuous operation, the system availability reaches 99.9997%, which is 2 orders of magnitude higher than the traditional single-source timing.

[0109] By running the adaptive delay compensation algorithm, the cost of transformation can be reduced. For example, in the unmodified 10kV distribution network, the timing accuracy can still reach 50ns, which reduces the line transformation demand by 85% compared with the traditional Beidou timing solution. Compared with the large-scale transformation of the network structure in the communication network and frequency standard network of the power system, this method only needs to make corresponding modifications on the local equipment to complete the communication and timing of Beidou satellites in the power system.

[0110] Embodiment 2:

[0111] On the basis of the first embodiment, this embodiment further provides a Beidou satellite-based power grid system timing system, including a Beidou ground control center, a power system communication network, and a Beidou timing processing module;

[0112] The Beidou ground control center is used for signal reception and processing, and generating reference signals;

[0113] The power system communication network is used for signal transmission and is also adapted for network adaptation and dynamic compensation;

[0114] The Beidou timing processing module is used for signal processing and clock synchronization.

[0115] It also includes a safety protection module;

[0116] The security protection module includes an anti-spoofing interference unit, a timing signal encryption unit, an illegal access detection unit, and a dynamic baseline detection unit;

[0117] The anti-spoofing interference unit detects and resists attacks of forged Beidou signals based on Beidou signal feature recognition technology to prevent timing spoofing;

[0118] The timing signal encryption unit uses a national secret algorithm to encrypt the time frequency reference signal, and introduces quantum key distribution technology at the physical layer to ensure the confidentiality and integrity of the timing signal;

[0119] The illegal access detection unit detects abnormal access behavior based on the power system topology to prevent illegal devices from accessing the power grid timing network;

[0120] The dynamic baseline detection unit establishes a Beidou signal feature baseline database and records the mean and standard deviation of signal parameters under normal circumstances.

[0121] This embodiment also provides a computer device, which is suitable for the Beidou satellite-based power grid system timing method, including a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the Beidou satellite-based power grid system timing method proposed in the above embodiment.

[0122] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0123] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for implementing a timing method for a power grid system based on Beidou satellites as proposed in the above embodiment is implemented.

[0124] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0125] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A timing method for a power grid system based on Beidou satellite, characterized in that: The following steps are included: Use the Beidou ground control center to obtain Beidou satellite signals and generate time and frequency reference signals; Transmitting the time and frequency reference signal to nodes at all levels through the communication network of the power system; Deploy Beidou timing processing modules in the central office equipment of the power system to process the received time and frequency reference signals and generate system clock signals consistent with the Beidou satellite time reference; The communication network adopts a dual-channel transmission architecture consisting of an optical fiber channel and a power line carrier channel; A time tag comparison mechanism is set up at the transmission layer. When the time deviation between two channels exceeds the preset threshold, the redundant switching module is triggered to automatically select the transmission channel with the smallest delay. It also includes deploying security protection modules on the central office equipment; The security protection module includes: an anti-spoofing and interference unit based on Beidou signal feature recognition, a timing signal encryption unit using a national secret algorithm, and an illegal access detection unit based on the power system topology structure; The encryption unit performs quantum key distribution encryption on the time frequency reference signal at the physical layer; The security protection module further includes a dynamic baseline detection unit, wherein the dynamic baseline detection unit performs the following steps: Establish a BeiDou signal characteristics baseline database; Real-time monitoring of the deviation between signal parameters and Beidou signal characteristic baseline ; when >3, an alarm is triggered and a preset safe clock signal is injected; Among them, the deviation The calculation formula is: ； In the formula, is the actual signal parameter value, indicating the currently monitored signal parameter value. is the mean value of the baseline signal parameter, indicating the average value of the signal parameter under normal circumstances, is the standard deviation of the baseline signal parameter, indicating the fluctuation range of the signal parameter under normal circumstances; n is the number of signal parameters, indicating the number of monitored signal parameters.

2. The Beidou satellite-based power grid system timing method according to claim 1, characterized in that: The step of processing the received time-frequency reference signal comprises: The transmission delay of each node is dynamically calculated through the power network topology structure, and the time and frequency reference signal is corrected using an adaptive delay compensation algorithm; The corrected signal is input into the disciplined clock module, and the phase of the local crystal oscillator and the Beidou satellite time reference are locked through an algorithm.

3. The Beidou satellite-based power grid system timing method according to claim 2, characterized in that: The adaptive delay compensation algorithm performs the following steps: A node transmission delay model is established based on the power network topology structure, which is specifically expressed as follows: ； In the formula, is the link length, is the signal propagation speed, is the queue delay, is the link bandwidth, is the node transmission delay, N is the total number of links; Obtaining actual transmission delay through online monitoring ; Calculate the compensation factor. The specific calculation formula is expressed as: ； In the formula, is the compensation factor; Apply the time-frequency reference signal times gain compensation.

4. A BeiDou satellite-based power grid system timing system, based on the BeiDou satellite-based power grid system timing method according to any one of claims 1 to 3, characterized in that: Includes Beidou ground control center, power system communication network, and Beidou timing processing module; The Beidou ground control center is used for signal reception and processing, and generating reference signals; The power system communication network is used for signal transmission and is also adapted for network adaptation and dynamic compensation; The Beidou timing processing module is used for signal processing and clock synchronization.

5. The Beidou satellite-based power grid system timing system as claimed in claim 4, characterized in that: It also includes a safety protection module; The security protection module includes an anti-spoofing interference unit, a timing signal encryption unit, an illegal access detection unit, and a dynamic baseline detection unit; The anti-spoofing interference unit detects and resists attacks of forged Beidou signals based on Beidou signal feature recognition technology to prevent timing spoofing; The timing signal encryption unit uses a national secret algorithm to encrypt the time frequency reference signal, and introduces quantum key distribution technology at the physical layer to ensure the confidentiality and integrity of the timing signal; The illegal access detection unit detects abnormal access behavior based on the power system topology to prevent illegal devices from accessing the power grid timing network; The dynamic baseline detection unit establishes a Beidou signal feature baseline database and records the mean and standard deviation of signal parameters under normal circumstances.

6. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the Beidou satellite-based power grid system timing method described in any one of claims 1 to 3 are implemented.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the Beidou satellite-based power grid system timing method described in any one of claims 1 to 3 are implemented.

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