Atomic clock group time frequency standard device of power system

Abstract

The invention discloses an atomic clock group time frequency standard device for a power system, and the device comprises an atomic clock group sub-system which is used for generating a 1pps second pulse time signal and a 10Mhz frequency signal; the time-keeping and time-keeping system is connected with the atomic clock group system and outputs a 1pps second pulse time signal and a 5Mhz frequency signal; the signal generation subsystem is connected with the time-keeping and time-keeping system and is used for generating a 1pps second pulse time signal, a 10Mhz frequency signal and a transmission signal; the remote comparison subsystem is connected with the signal generation subsystem and traces the local courtyard time to the time frequency measurement reference in real time; the internal time comparison and monitoring subsystem is connected with the atomic clock component subsystem and the signal generation subsystem and is used for realizing time difference monitoring and phase difference detection; and the comprehensive control subsystem is connected with the internal time comparison and monitoring subsystem, the remote comparison subsystem and the time-keeping and time-keeping system.

Description

Technical Field

[0001] The present invention relates to the technical field of time and frequency standards, and more specifically, to an atomic clock group time and frequency standard device for a power system. Background Art

[0002] At present, the timekeeping clock groups of most timekeeping laboratories at home and abroad are composed of hydrogen atomic clocks and cesium atomic clocks. Accurate atomic time scales are generated through international time comparison and cesium fountain driving master clocks. German Standard Time UTC (PTB), American Standard Time UTC (NIST), US Naval Observatory Standard Time UTC (USNO), Japanese Standard Time UTC (NICT) and Russian National Standard Time UTC (SU) all control the standard time UTC (k) through time comparison, cesium fountain driving and hydrogen cesium clock group timekeeping. The US NIST is mainly responsible for the generation, maintenance and dissemination of US national standard time and frequency. NIST currently has 7 cesium atomic clocks, 5 hydrogen atomic clocks and 1 cesium fountain clock. The time standard index relative to Coordinated Universal Time (UTC) is 5.4ns, and the frequency standard uncertainty is 2.77E-15. The USNO provides high-precision astronomical data and publishes standard time for the US Navy, Department of Defense and other departments. The master clock of the GPS system and the master clock of USNO are mutually master and backup. USNO currently has 17 cesium atomic clocks, 32 hydrogen atomic clocks and 4 cesium fountain clocks, with a time standard index of 0.2ns. The German Federal Institute of Physics and Technology (Physikalisch-Technische BUndesanstalt, PTB) is the global time and frequency comparison center. PTB uses its own cesium frequency standard to achieve the generation, maintenance and dissemination of German national standard time. The PTB time standard index is 0.1ns, and the frequency standard uncertainty is 2.02E-15.

[0003] In terms of atomic time scale, the world's most advanced time and frequency laboratories all use clock groups to keep time. my country's National Institute of Metrology, the 203rd Institute of Aerospace and the National Time Service Center use cesium and hydrogen clock groups as timekeeping standards and have successively established local atomic time.

[0004] The current power system time and frequency are facing the following problems:

[0005] (1) The existing GPS timing and frequency synchronization has security risks.

[0006] The power system is a national strategic infrastructure. The time and frequency required for its core business cannot rely solely on the US GPS system. It is not autonomous and controllable, and there are huge security risks.

[0007] (2) The power system time and frequency network is in a quasi-synchronous state, which is not in line with the mainstream technology development of the international power grid.

[0008] Each substation directly synchronizes with the GPS satellite system in the sky, resulting in a frequency synchronization error of 10-12 between substations, and code slippage will occur in the long term (5-8 years). In recent years, Europe, Japan, and the United States have all upgraded from quasi-synchronization to full synchronization of power grid time and frequency, and the frequency synchronization error between different substations is no higher than 10-13. The company's development of time and frequency synchronization should be in line with the mainstream trend of the international power grid.

[0009] (3) The reliability, operation and maintenance guarantee, and indicator stability of existing time and frequency measurement standard devices need to be improved.

[0010] The time and frequency measurement standard currently established is a single clock operation mode, with little reliability guarantee, and incomplete fault diagnosis and protection measures. By forming a hydrogen cesium clock group and combining multiple atomic clocks to output signals, the dependence on a single atomic clock in the group can be reduced, effectively improving the continuity and stability of the output time and frequency signals.

[0011] (4) The expansion of energy Internet business has put forward higher requirements for timing and frequency services, which in turn forces the accuracy of time and frequency benchmarks to be further improved.

[0012] With the explosive growth of low-latency and collaborative computing demands for massive terminals such as Beidou and 5G in my country's energy internet, time synchronization at the application level has been upgraded from milliseconds to 30ns-50ns. The huge demand for improved time and frequency synchronization has put forward higher requirements for the company's time and frequency benchmark. At present, the time accuracy of existing cesium atomic clocks is 20ns, which mainly meets the application requirements for time synchronization accuracy below 200ns. In order to meet the application requirements of 30ns-50ns time synchronization accuracy, the time accuracy of the time and frequency benchmark needs to be improved to within 10ns. Summary of the invention

[0013] In view of the deficiencies in the prior art, the present invention provides an atomic clock group time and frequency standard device for an electric power system.

[0014] According to one aspect of the present invention, there is provided an atomic clock group time and frequency standard device for a power system, comprising:

[0015] Atomic clock component system, used to generate 1pps pulse-per-second time signal and 10Mhz frequency signal;

[0016] The timekeeping subsystem is connected to the atomic clock group system to adjust the signal and output a 1pps second pulse time signal and a 5Mhz frequency signal;

[0017] The signal generation subsystem is connected to the timekeeping subsystem and is used to generate a 1pps pulse-per-second time signal, a 10Mhz frequency signal and a transmission signal;

[0018] The remote comparison subsystem is connected to the signal generation subsystem and is composed of a multi-mode formula receiver. It uses satellite formula technology to achieve time comparison and carrier phase comparison with standard time, and traces the local time back to the time and frequency measurement benchmark in real time;

[0019] The internal time comparison and monitoring subsystem is connected with the atomic clock component system and the signal generation subsystem to realize time difference monitoring and phase difference detection;

[0020] The integrated control subsystem is connected with the internal time comparison and monitoring subsystem, the remote comparison subsystem and the timekeeping subsystem to realize the information control of each subsystem.

[0021] Optionally, the atomic clock group time and frequency standard device of the power system also includes: a security subsystem, including: one or more of an isolation transformer, a UPS power supply, and a temperature and humidity controller, which are used to ensure that the system power supply is accurate and stable and the environment is constant.

[0022] Optionally, the atomic clock subsystem includes: an atomic clock group and an 8-channel clock signal expansion and amplification circuit.

[0023] Optionally, the timekeeping subsystem includes: 2 frequency signal selection switches and 2 phase micro-jump meters.

[0024] Optionally, the signal generation subsystem is composed of 2 frequency signal distribution amplifiers and 2 pulse signal distribution amplifiers, 2 B code signal generators, 2 B code distribution amplifiers and 2 network time servers, wherein:

[0025] The frequency signal distribution amplifier and the pulse signal distribution amplifier receive the 5Mhz frequency signal and the 1pps second pulse time signal from the timekeeping subsystem respectively;

[0026] The B code signal generator outputs the signal to the B code distribution amplifier, and the B code distribution amplifier provides the B code signal to the outside;

[0027] The network time server provides timing services through NTP and PTP.

[0028] Optionally, the internal time comparison and monitoring subsystem is composed of two multi-channel time interval counters and two multi-channel phase comparators, wherein the channel time interval counters receive 1pps time signals from the atomic clock component system to monitor the time difference; the multi-channel phase comparators receive 10Mhz frequency signals from the atomic clock component system to monitor the phase difference and have an alarm function.

[0029] Optionally, the integrated control subsystem includes atomic time calculation, time and frequency driving control, atomic clock performance evaluation, atomic clock expansion, equipment condition collection and monitoring, and time and frequency measurement functions.

[0030] Optionally, the atomic clock group includes 6 atomic clocks, 3 hydrogen atomic clocks and 3 cesium atomic clocks, 1 of which is used as a master clock and 5 are hot backup clocks, and the formula for calculating the atomic time is:

[0031]

[0032] in, is the clock error of the master clock relative to the integrated time, t i (t+τ) is the time difference between the ith clock and the master clock measured at time (t+τ), x i (t) is the time difference of the i-th clock at time t, y i (t) is the rate of the ith clock and τ is the time interval in the measurement.

[0033] Therefore, the atomic clock group time and frequency standard device for the power system proposed in the present invention is based on the long-distance distributed network characteristics of the power system, centered on the application needs of professional fields such as power system dispatching, relay protection, automation, and metering, and uses high-performance hydrogen and cesium atomic clocks to form a hydrogen-cesium joint atomic clock group to formulate a frequency standard for generating local time, providing a unified and reliable source of time and frequency values ​​for the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0035] Figure 1 It is a schematic diagram of the structure of an atomic clock group time and frequency standard device for a power system provided by an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0036] Below, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described here.

[0037] It should be noted that the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0038] Those skilled in the art can understand that the terms "first" and "second" in the embodiments of the present invention are only used to distinguish different steps, devices or modules, etc., and neither represent any specific technical meaning nor indicate the necessary logical order between them.

[0039] It should also be understood that, in the embodiments of the present invention, “plurality” may refer to two or more than two, and “at least one” may refer to one, two or more than two.

[0040] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more, unless explicitly limited or otherwise indicated in the context.

[0041] In addition, the term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0042] It should also be understood that the description of the various embodiments of the present invention focuses on the differences between the various embodiments, and the same or similar aspects thereof can be referenced to each other, and for the sake of brevity, they will not be described one by one.

[0043] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0046] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0047] Figure 1 FIG. 1 is a schematic diagram of a structure of an atomic clock group time and frequency standard device for a power system provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as Figure 1 The atomic clock group time and frequency standard device of the power system shown includes:

[0048] Atomic clock component system, used to generate 1pps pulse-per-second time signal and 10Mhz frequency signal;

[0049] The timekeeping subsystem is connected to the atomic clock group system to adjust the signal and output a 1pps second pulse time signal and a 5Mhz frequency signal;

[0050] The signal generation subsystem is connected to the timekeeping subsystem and is used to generate a 1pps pulse-per-second time signal, a 10Mhz frequency signal and a transmission signal;

[0051] The remote comparison subsystem is connected to the signal generation subsystem and is composed of a multi-mode formula receiver. It uses satellite formula technology to achieve time comparison and carrier phase comparison with standard time, and traces the local time back to the time and frequency measurement benchmark in real time;

[0052] The internal time comparison and monitoring subsystem is connected with the atomic clock component system and the signal generation subsystem to realize time difference monitoring and phase difference detection;

[0053] The integrated control subsystem is connected with the internal time comparison and monitoring subsystem, the remote comparison subsystem and the timekeeping subsystem to realize the information control of each subsystem.

[0054] Specifically, the atomic clock group time and frequency standard device for the power system proposed in the present invention is based on the long-distance distributed network characteristics of the power system, centered on the application needs of professional fields such as power system dispatching, relay protection, automation, and metering, and utilizes high-performance hydrogen and cesium atomic clocks to form a hydrogen-cesium joint atomic clock group to formulate a frequency standard for generating local time, providing a unified and reliable source of time and frequency values ​​for the power system.

[0055] The atomic clock group time and frequency standard device for power system proposed in the present invention is divided into 7 subsystems, namely atomic clock component system, remote traceability comparison subsystem, internal time comparison and monitoring subsystem, timekeeping subsystem, signal generation subsystem, integrated control subsystem and guarantee subsystem.

[0056] The first is the atomic clock component system, which consists of 4 cesium clocks and 8-way clock signal expansion and distribution amplifiers. The 4 cesium clocks generate two signals, a 1pps time signal and a 10Mhz frequency signal, so it is called a time and frequency standard. The signal is expanded to 5 outputs by the expansion distribution amplifier.

[0057] The second is the timekeeping subsystem, which consists of two frequency signal selection switches and two phase micro-leap meters. The frequency signal selection switch supports 8-channel atomic clock signal input, which is used to select the main and backup clocks and output them to the phase micro-leap meter; the time-frequency signal output by the phase micro-leap meter is the local atomic time.

[0058] The third is the internal time comparison and monitoring subsystem, which consists of two multi-channel time interval counters and two multi-channel phase comparators. The former receives the 1pps time signal from the atomic clock component system to monitor the time difference; the latter receives the 10Mhz frequency signal from the atomic clock component system to monitor the phase difference and has an alarm function.

[0059] The fourth is the signal generation subsystem, which consists of 2 frequency signal distribution amplifiers and 2 pulse signal distribution amplifiers, 2 signal (B code) generators, 2 B code distribution amplifiers and 2 network time servers. The frequency signal distribution amplifier and the pulse signal distribution amplifier receive the frequency and PPS signals from the timekeeping subsystem respectively, and the output is the local atomic time. Please see the first display screen on the upper left of the wall for the corresponding output time. The signal (B code) generator outputs the signal to the B code distribution amplifier, which provides the B code signal to the outside; the network time server provides time service to the outside through NTP and PTP, which corresponds to UTC Coordinated Universal Time. Please see the second display screen on the right of the wall. There is also a GPS / BDS navigation signal isolation amplifier.

[0060] The fifth is the remote traceability and comparison subsystem, which is composed of a multi-mode common-view receiver. Through satellite, common-view time comparison and carrier phase time comparison methods, the local atomic time is traced back to the national time and frequency standard or compared with the first-level timekeeping agency participating in the BIPM international time comparison.

[0061] The sixth is the comprehensive control subsystem, which uses software to integrate seven major functions, including comprehensive atomic time calculation, time traceability to frequency driving control, atomic clock performance evaluation, atomic clock up and down decision-making, atomic clock expansion, equipment operating condition collection and monitoring, and time and frequency measurement.

[0062] The seventh is the security subsystem, which is composed of an isolation transformer, UPS power supply, temperature and humidity controller, etc., to ensure that the system power supply is accurate and stable and the environment is constant.

[0063] The power system has a complex grid structure and is one of the most complex industrial networks in the world. High-stability time and frequency are crucial to the accurate measurement of power grids, safe and stable operation, and the construction and development of new business forms such as energy Internet. A highly reliable and highly stable clock unified traceability system is the key to achieving the generation and distribution of highly stable time and frequency.

[0064] The atomic clock group time and frequency standard device for the power system proposed in the present invention is positioned as an important infrastructure of the company and can be applied to various fields of energy Internet source, network, load and storage. It can fully meet the timing and frequency service needs of existing power metering, communication, dispatching, relay protection and automation, and the laboratory field or remote time and frequency device detection needs; it can achieve low-latency and high-stability support for massive terminals of Beidou, 5G, edge computing and collaborative interaction of the energy Internet.

[0065] In one embodiment of the present application, the following algorithm is also included:

[0066] 1. Atomic time algorithm design

[0067] This clock group is equipped with a total of 6 atomic clocks, including 3 hydrogen atomic clocks and 3 cesium atomic clocks, of which 1 is used as the main clock and the other 5 are used as hot backup clocks, denoted as H i , let x i (t) is the time difference of the i-th clock at time t, y i (t) is the rate of the ith clock, and τ is the time interval in the measurement. Then the time difference of the ith clock relative to the combined clock at time (t+τ) can be estimated as:

[0068]

[0069] Among them, x i (t), y i (t) An initial value needs to be set in advance.

[0070] The time difference between the i-th clock and the master clock measured by the hardware device at time (t+τ) is t i (t+τ), then at (t+τ), the clock error of the master clock relative to the comprehensive time can be estimated by the i-th clock:

[0071]

[0072] Combined to get:

[0073]

[0074] The above formula represents the estimated value of the integrated time calculated from the time and rate of the i-th clock at time t relative to the master clock at time (t+τ).

[0075] Using previous time and rate data and current measurement results, each clock can provide an estimate of the time difference between the master clock and the combined atomic time. If different weights are assigned to each clock, the time difference between the combined clock and the master clock can be obtained by weighted average:

[0076]

[0077] In the above formula, ω i is the weight corresponding to each clock, x r (t+τ) is actually the definition of the integrated time relative to the master clock at (t+τ), and the estimated integrated time is randomly distributed around the mean value.

[0078] In summary, the original data x i (t), t i (t+τ) can be obtained through measurement, so the two unknown quantities involved in the comprehensive time scale algorithm are the rate y of each clock i (t) and weight ω i .

[0079] Clock rate yi (t): Introducing an exponential filter into the integrated time scale algorithm makes the rate a slow-changing time function with a time constant. In a short period of time, the frequency can be considered a constant; but in a long period of time, as the clock performance decreases, it will change. Its mathematical expression is:

[0080]

[0081] in,

[0082]

[0083] In the above formula, It refers to the minimum sampling interval at which clock i performs most stably. Intuitively speaking, it is the sampling interval corresponding to the minimum calculated Allan variance value. is the basic sampling interval.

[0084] Weight ω i :This algorithm determines the weight using the expected error, that is, the difference between the expected value of each clock relative to the combined clock and the current value, that is,

[0085]

[0086] The weight value is calculated using the following formula:

[0087]

[0088] in, i represents the i-th clock, and j represents the j-th moment.

[0089] 2. Local time UTC(k) control strategy

[0090] Since the timekeeping system can directly obtain the time deviation between the local time and UTC (NIM) through satellite common view, the time deviation can be used as the basis for controlling the local UTC (k). The local time is obtained by controlling the master clock. The control of local time is divided into two scenarios: the traceability link is normal and the traceability link is disconnected, which are analyzed and discussed separately.

[0091] (1) When the traceability link is normal

[0092] By monitoring the time difference between the local time and UTC (NIM) in real time and controlling the phase micrometer, the consistency with UTC (NIM) can be maintained.

[0093] Note i The difference between the local time and UTC (NIM) is:

[0094]

[0095] In the period [t i , t j ], the local clock speed relative to UTC (NIM) is:

[0096]

[0097] (2) When the traceability link is disconnected

[0098] When the traceability link is interrupted, the timekeeping system cannot obtain the time deviation relative to UTC (NIM). At this time, the atomic time TA (k) calculated by the system will serve as the main basis for controlling the system UTC (k).

[0099] Note i The difference between the local time and TA(k) is:

[0100]

[0101] In the period [t i , t j ], the local clock speed relative to TA(k) is:

[0102]

[0103] The clock speed difference k calculated in the above two scenarios is the basic basis for adjusting the output signal using the phase micro-jump meter. In actual output control, both long-term stability and short-term stability must be considered. Excessive adjustment and frequent adjustment times will have a certain impact on the stability of the output signal. In order not to destroy the stability of the output signal, it is necessary to reasonably determine the adjustment amount and adjustment cycle based on the stability index.

[0104] 3. Main and backup time synchronization control

[0105] To improve reliability, a two-way timekeeping system for main and backup is established, with redundant hot backup operation. When the main line is operating normally, the backup line system controls the phase micro-jump meter to continuously lock on the main line to ensure that its frequency and phase are consistent with the main line. The time difference between the main and backup lines is measured using a multi-channel counter with a measurement accuracy of 50ps. The frequency adjustment of the backup line is obtained by calculating the frequency deviation and phase deviation of the backup line relative to the main line, and then the phase micro-jump meter of the backup line is used to adjust and control it. By setting the control strategy, the time deviation index of the main and backup lines can be guaranteed.

[0106] The main and backup time synchronization control is divided into two parts: the initial synchronization module and the phase / frequency synchronization module.

[0107] (1) Initial synchronization module

[0108] The initial synchronization module is the first task to be performed in the master-slave clock synchronization, which enables the system to achieve initial phase / frequency synchronization in a short time before entering the phase / frequency synchronization module. It is only executed once after the system is started.

[0109] At the beginning, the measurement and control equipment is set up first, mainly including the measurement mode, trigger level, counter network communication of the counter, and serial-to-Ethernet communication of the phase micro-step meter. After the settings are completed, multiple data are continuously collected at intervals of 1s, and the least squares algorithm is used to fit the data to find the slope a, that is, the frequency deviation of the backup clock relative to the main clock is a. The phase micro-step meter is used to add a frequency deviation of -a to the backup clock to reduce the frequency deviation of the backup clock relative to the main clock.

[0110] After completing frequency synchronization, send the "SYNC" command to the phase micro-step meter, so that the 1PPS output by the backup clock after passing through the phase micro-step meter can achieve phase synchronization of less than 200ns with the 1PPS output by the main clock.

[0111] (2) Phase / frequency synchronization module

[0112] The phase / frequency synchronization module can realize real-time phase synchronization between the master clock and the backup clock. The time interval counter is used to measure the master-backup clock difference, and the data is collected through the network. The collected data is processed and analyzed. If the clock difference exceeds a certain threshold, the fault detection module is entered. If the master-backup clock difference data is normal, it is necessary to use a suitable frequency control algorithm to calculate the frequency compensation set for the backup clock, and control the backup clock through the phase micro-jump meter. The algorithm for frequency control of the backup clock is as follows:

[0113] Predict the frequency deviation of the backup clock frequency relative to the main clock at the next moment. For the clock difference data of the backup clock relative to the main clock in continuous time periods, use the least squares method to make a linear fit, calculate the frequency deviation of the backup clock relative to the main clock at the next moment, and select the negative number of the frequency deviation as the compensation amount, which is recorded as offset1.

[0114] Reduce the phase deviation of the backup clock relative to the main clock. In terms of phase, the backup clock is close to the main clock, and the compensation amount is recorded as offset2. If the actual phase difference between the backup clock and the main clock is not eliminated, the final phase difference between the backup clock and the main clock will not return to zero.

[0115] The specific calculation method is as follows: the last master-slave clock difference obtained at the calculation time is recorded as Δ1. In order to ensure the synchronization accuracy of the master-slave clock as much as possible, select a suitable time T1 and pull back the master-slave clock difference Δ1, that is,

[0116] offset2=Δ1÷T1 (13)

[0117] Through control, the main and backup road times can be kept consistent.

[0118] 4. Online self-monitoring mechanism

[0119] The internal time comparison and monitoring subsystem is responsible for monitoring the key equipment of the atomic clock component system, remote traceability comparison subsystem, timekeeping subsystem, and signal generation subsystem. The system online monitoring is designed according to the following three levels:

[0120] (1) Equipment self-monitoring

[0121] Each device is designed to be self-monitoring. Hydrogen atomic clocks and cesium atomic clocks will perform built-in monitoring of their internal power supply, lock status and other parameters, and report any abnormalities through fault codes.

[0122] The phase micro-jump meter detects the locking state of the internal phase-locked loop. The standard time code generator, isolation amplifiers, etc. can detect the key parameters of their internal circuits.

[0123] (2) In the system signal flow, each device detects the output signal of the previous device

[0124] According to the working mode of the system, the signal flow of the system is atomic clock, clock signal expansion distribution amplifier, frequency signal selection switch, phase micro-jump meter, standard time code generator and various signal isolation amplifiers.

[0125] Each device can detect the presence or absence of input signals, thereby providing an abnormal alarm for the output of the previous device. Each signal isolation amplifier supports more than 2 inputs. When an abnormal signal is detected in the current working channel, the device automatically switches to the normal channel to ensure continuous and reliable output signals.

[0126] (3) Use special test equipment to detect key signals

[0127] The system is equipped with two multi-channel phase comparators and two multi-channel counters. The multi-channel phase comparators detect the 5MHz signal indicators output by key equipment such as atomic clocks and phase micro-jump meters. The multi-channel counters detect the 1PPS signal indicators output by key equipment such as atomic clocks and phase micro-jump meters.

[0128] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present invention to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. An atomic clock group time and frequency standard device for a power system, characterized in that: include: Atomic clock component system, used to generate 1pps pulse-per-second time signal and 10Mhz frequency signal; A timekeeping subsystem, connected to the atomic clock group system, used to adjust the signal and output a 1pps pulse-per-second time signal and a 5Mhz frequency signal; A signal generating subsystem, connected to the timing subsystem, for generating a 1pps pulse-per-second time signal, a 10Mhz frequency signal and a transmission signal; The remote comparison subsystem is connected to the signal generation subsystem and is composed of a multi-mode formula receiver. It realizes time comparison and carrier phase comparison with the standard time through satellite formula technology, and traces the local time to the time and frequency measurement benchmark in real time; An internal time comparison and monitoring subsystem, connected to the atomic clock component system and the signal generation subsystem, for realizing time difference monitoring and phase difference detection; The integrated control subsystem is connected with the internal time comparison and monitoring subsystem, the remote comparison subsystem and the timekeeping subsystem to realize information control of each subsystem.

2. The atomic clock group time and frequency standard device for the power system according to claim 1, characterized in that: Also includes: The security subsystem includes one or more of an isolation transformer, a UPS power supply, and a temperature and humidity controller, which are used to ensure that the system power supply is accurate and stable and the environment is constant.

3. The atomic clock group time and frequency standard device for the power system according to claim 1, characterized in that: The atomic clock subsystem comprises: an atomic clock group and an 8-channel clock signal expansion and amplification circuit.

4. The atomic clock group time and frequency standard device for the power system according to claim 1, characterized in that: The timekeeping subsystem includes: 2 frequency signal selection switches and 2 phase micro-jump meters.

5. The atomic clock group time and frequency standard device for the power system according to claim 1, characterized in that: The signal generation subsystem is composed of 2 frequency signal distribution amplifiers and 2 pulse signal distribution amplifiers, 2 B code signal generators, 2 B code distribution amplifiers and 2 network time servers, wherein: The frequency signal distribution amplifier and the pulse signal distribution amplifier receive a 5Mhz frequency signal and a 1pps second pulse time signal from the timekeeping subsystem respectively; The B code signal generator outputs a signal to the B code distribution amplifier, and the B code distribution amplifier provides a B code signal to the outside; The network time server provides timing services to the outside through NTP and PTP.

6. The atomic clock group time and frequency standard device for the power system according to claim 1, characterized in that: The internal time comparison and monitoring subsystem is composed of two multi-channel time interval counters and two multi-channel phase comparators, wherein the channel time interval counter receives a 1pps time signal from the atomic clock component system to monitor the time difference; the multi-channel phase comparator receives a 10Mhz frequency signal from the atomic clock component system to monitor the phase difference and has an alarm function.

7. The atomic clock group time and frequency standard device for the power system according to claim 3, characterized in that: The comprehensive control subsystem includes atomic time calculation, time and frequency driving control, atomic clock performance evaluation, atomic clock expansion, equipment condition collection and monitoring, and time and frequency measurement functions.

8. The atomic clock group time and frequency standard device for the power system according to claim 7, characterized in that: The atomic clock group includes 6 atomic clocks, 3 hydrogen atomic clocks and 3 cesium atomic clocks, 1 of which is used as a master clock and 5 are hot backup clocks, and the formula for calculating the atomic time is: in, is the clock error of the master clock relative to the integrated time, t i (t+τ) is the time difference between the ith clock and the master clock measured at time (t+τ), x i (t) is the time difference of the i-th clock at time t, y i (t) is the rate of the ith clock and τ is the time interval in the measurement.

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