CN106154816A - A kind of punctual method of automaton high accuracy - Google Patents
A kind of punctual method of automaton high accuracy Download PDFInfo
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- CN106154816A CN106154816A CN201610555691.0A CN201610555691A CN106154816A CN 106154816 A CN106154816 A CN 106154816A CN 201610555691 A CN201610555691 A CN 201610555691A CN 106154816 A CN106154816 A CN 106154816A
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- G—PHYSICS
- G04—HOROLOGY
- G04G—ELECTRONIC TIME-PIECES
- G04G7/00—Synchronisation
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- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses the punctual method of a kind of automaton high accuracy, specifically include following step: FPGA when possessing GPS time service pulse, RTC pulse is carried out frequency and phasing；Utilize the RTC pulse after correction to carry out counting and produce a GPS time service pulse frequency and phase locked interrupt signal；CPU obtains nanoseconds information accurately to internal counter interpolation smoothing after receiving interrupt requests；Temporal information after CPU utilizes interpolation smoothing after GPS time service pulse missing carries out system and keeps time.The present invention, on the basis of not changing original RTC circuit topology, utilizes RTC pulse to keep time, and while reducing design cost, can meet again the requirement for punctual precision of the power station secondary automation equipment device.
Description
Technical field
The present invention relates to a kind of automaton (microcomputer protecting device, fault wave recording device, data concentrator device, electric energy
The automation equipments such as metering device) the punctual method of high accuracy, belong to power system automation technology field.
Background technology
Power station uses the automation equipment of different manufacturers, microcomputer protecting device, fault wave recording device, electric energy meter mostly now
Amount device, computer supervisory control system etc..Along with going deep into of intelligent substation construction, intelligent automation device time precision is referred to
Indicate further requirement.Such as wave recording device and data concentrator apparatus, at least can be after outer synchronous signal disappears
± 1s synchronization accuracy requirement is met in 24h.This just requires that secondary automation equipment must possess high-precision system and keep time function.
Conventional DS3232 clock chip is used for punctual design and reads RTC core generally by CPU or FPGA by I2C interface
In sheet, the temporal information of storage is kept time, but the temporal information of this clock chip storage inside may be only accurate to the second,
Therefore in the case of outside time signal disappears, if the method only by I2C reading internal time information carries out keeping time and can make
Become the bigger error of system time.
Have following several ways can improve automation equipment system at present to keep time the scheme of precision.
See Fig. 1, option A: utilize temperature compensating crystal oscillator TCXO as system timer crystal oscillator, mainly by temperature compensating crystal oscillator
High freuqency accuracy parameter counts, and reaches to reduce the purpose of time keeping error.Option A mainly uses high-precision temperature compensating crystal oscillator
TCXO depends primarily on the frequency accuracy of temperature compensating crystal oscillator as the work crystal oscillator of automation equipment, the precision of this scheme, and
Owing to employing independent work crystal oscillator, system time can be caused not on the basis of not using frequency compensation and phase compensation
Synchronize, and the temperature compensating crystal oscillator that precision is the highest, cost is the highest.
See Fig. 2, option b: utilize the I2C interface timing of RTC chip to read the content of time memory, then update system
System temporal information.Option b relies on the time register within RTC to keep time when external GPS pair after blackout, time essence
Degree is completely dependent on the timer interruption time of CPU, and the precision that system is kept time is worst.
See Fig. 3, scheme C: the dominant frequency clock directly utilizing CPU is timed device counting, the first pulse per second (PPS) width to GPS
Degree counts, and carries out interpolation smoothing and obtains the penalty coefficient of dominant frequency clock, then converts Counter Value, reduces CPU
Dominant frequency frequency departure.Scheme C directly utilizes CPU and dominant frequency clock is carried out interpolation smoothing compensates, owing to CPU frequency uses general
Logical crystal oscillator, frequency departure is relatively big, and CPU needs to carry out frequently interpolation calculation, adds the load of CPU, reduces the fortune of CPU
Line efficiency.
Summary of the invention
The deficiency existed for prior art, it is an object of the present invention to provide a kind of punctual method of automaton high accuracy,
On the basis of not changing original RTC circuit topology, utilize RTC pulse to keep time, while reducing design cost, can expire again
Foot power station secondary automation equipment device is for the requirement of punctual precision.
To achieve these goals, the present invention is to realize by the following technical solutions:
A kind of automaton punctual method of high accuracy of the present invention, specifically includes following step:
(1), after automaton powers on, FPGA reads temporal information from RTC, and is saved in internal 32 bit time depositors；
(2) start to detect whether the outside time service pulse of GPS, if external GPS pulse exists, turn to step (3),
If GPS pulse does not exists, turn to step (5)；
(3) judging whether GPS second pulse loses during time service, without loss, FPGA directly detects GPS second arteries and veins
Rushing rising edge and each GPS rising edge time, and turn to step (6), if lost, preservation gps time, to RTC, then judges
RTC pulse is the most synchronize with GPS pulse, if synchronizing, turning to step (2), if asynchronous, turning to step (4)；
(4) FPGA safeguards internal counter SysTimeCnt, when GPS second pulse by detection GPS second rising edge of a pulse
Rising edge arrives, and reads SysTimeCnt value, resets simultaneously and carry out calculating next time, then calculate the second arteries and veins of 32.768KHz Yu GPS
Phase and frequency relation between punching, thus reach external GPS pulse and 32.768KHz pulse frequency and Phase synchronization；
(5) FPGA starts to count the 32.768KHz pulse of RTC, and count value is equal to table during 32767+Coff_Reg
Show 1 second, then turn to step (6)；
(6) internal system time register value adds 1, then produces CPU interrupt requests, and CPU is carried out after receiving interrupt requests
Interrupt processing, after obtaining the nanoseconds information that FPGA sends whole time second and the therein enumerator come, when carrying out system
Between update.
In step (1), FPGA reads temporal information from RTC by I2C bus.
The one of the present invention can carry out high accuracy for automation device for transformer substation when external GPS pair during dropout
Punctual technical scheme, the program need not expensive temperature compensating crystal oscillator, but utilizes the 32.768kHz of RTC chip self
Pulse keep time, reduce production cost；The present invention utilizes FPGA to the rising edge of the pulse of GPS to RTC's
32.768kHz pulse carries out frequency and phasing, produce one with the interrupt signal of GPS second impulsive synchronization, in GPS second pulse
High-precision punctual demand still can be kept during dropout；The present invention can only preserve the temporal information of whole second at RTC chip
On the basis of increase nanosecond information, improve the punctual precision of automation equipment.
Accompanying drawing explanation
Fig. 1 is high accuracy temperature compensating crystal oscillator solution principle figure；
Fig. 2 is that I2C reads RTC time information scheme schematic diagram；
Fig. 3 is that CPU keeps time design schematic diagram；
Fig. 4 is the punctual solution principle block diagram of the present invention；
Fig. 5 is the FPGA interrupt requests sequential chart of the present invention；
Fig. 6 is that GPS second impulsive synchronization processes sequential chart；
Fig. 7 is working-flow figure；
Fig. 8 is that CPU keeps time workflow diagram.
Detailed description of the invention
For the technological means making the present invention realize, creation characteristic, reach purpose and be easy to understand with effect, below in conjunction with
Detailed description of the invention, is expanded on further the present invention.
After the technical problem to be solved is external GPS time service pulse missing, the most high-precision carry out system
Punctual, concrete implementation principle is as follows:
Seeing Fig. 4, FPGA to count the pulse of the 32.768kHz of RTC, counting down to 32767 from 0 is exactly 1s, then
One interrupt requests Irq of FPG A generation records local count device value in interruption to CPU, CPU and (in I.MAX6, uses 64bit
Timebase value), then enumerator is carried out interpolation smoothing record CPU interrupt to read FPGA temporal information need time
Deviation, calculates the phase relation of the 32.768kHz of CPU count value and RTC, so reaches the arteries and veins of CPU self clock and RTC
The Frequency Synchronization of punching and phase locked purpose, can guarantee that high-precision punctual demand when outside GPS second pulse missing.
See Fig. 5, at 1 enumerator CntNum of FPGA internal maintenance, the pulse of the 32.768kHz of RTC counted,
Writing 32768 pulses all over is exactly 1 second, now produce interrupt request singal to CPU, CPU utilize timer internal carry out interpolation put down
Sliding algorithm, reaches time precision demand.
FPGA Yu GPS time service pulse per second (PPS) Synchronization Design
Seeing the internal another one enumerator SysTimeCnt of Fig. 6, FPGA is the arrival moment of the pulse per second (PPS) to GPS to start meter
Number, work clock is 50MHz, and resolution is 20ns, is closed by the frequency of the interpolation calculation RTC pulse of this Counter Value with GPS
System and phase relation, and calculated coefficient is put in coefficient register Coff_Reg, this depositor can pass through USART
Conduct interviews, be used for calculating the relation of internal Timebase Yu the RTC 32.768kHz pulse of CPU.
Seeing Fig. 7, in the present invention program, after device powers on, FPGA reads the calendar information of RTC by I2C bus, from
And reach the function that power-off is punctual, and then carrying out GPS pulse detection, RTC pulse is Tong Bu with GPS second pulse frequency, and GPS pulse is deposited
Time, system use gps time, GPS second pulse disappear after RTC pulse is counted, whole moment second produce interrupt please
Ask and carry out the correction of system time to CPU, notice CPU.
Specifically comprise the following steps that
(1), after automaton powers on, FPGA reads temporal information from RTC, and is saved in internal 32 bit time depositors；
(2) start to detect whether the outside time service pulse of GPS, if external GPS pulse exists, turn to step (3),
If GPS pulse does not exists, turn to step (5)；
(3) judging whether GPS second pulse loses during time service, without loss, FPGA directly detects GPS second arteries and veins
Rushing rising edge and each GPS rising edge time, and turn to step (6), if lost, preservation gps time, to RTC, then judges
RTC pulse is the most synchronize with GPS pulse, if synchronizing, turning to step (2), if asynchronous, turning to step (4)；
(4) FPGA safeguards internal counter SysTimeCnt, when GPS second pulse by detection GPS second rising edge of a pulse
Rising edge arrives, and reads SysTimeCnt value, resets simultaneously and carry out calculating next time, then calculate the second arteries and veins of 32.768KHz Yu GPS
Phase and frequency relation between punching, thus reach external GPS pulse and 32.768KHz pulse frequency and Phase synchronization；
(5) FPGA starts to count the 32.768KHz pulse of RTC, and count value is equal to table during 32767+Coff_Reg
Show 1 second, then turn to step (6)；
(6) internal system time register value adds 1, then produces CPU interrupt requests, and CPU is carried out after receiving interrupt requests
Interrupt processing, after obtaining the nanoseconds information that FPGA sends whole time second and the therein enumerator come, when carrying out system
Between update.
The Interface design of CPU Yu FPGA and error correction
Seeing Fig. 8, after GPS pulse is lost, RTC pulse and GPS have been carried out synchronous correction, the meter to RTC pulse
Number device value has been carried out interpolation smoothing, it is ensured that the interrupt requests of FPGA and the pps pulse per second signal of GPS have accomplished that frequency is same
Step and Phase synchronization.CPU reads the Counter Value of inside in the Timebase of 64bits after receiving interrupt requests, CPU pair
Update system time after Counter Value interpolation smoothing, complete the punctual of automation equipment.
Compared with the option A in background technology, the automation equipment of the present invention is used to keep time scheme, original not changing
When the pulse utilizing the 32.768kHz of the RTC chip such as RTC on the basis of circuit design exports the input as FPGA enumerator
Clock, and this pulse of RTC chip output-40～85 DEG C working environment lower frequency error be only ± (1ppm is hundred to 3.5ppm
Ten thousand/), so coordinate frequency compensation and Phase Compensation Algorithm, meet power automatic device and keep time the requirement of precision, and
And reduce cost.
Compared with the option b in background technology, the automation equipment of the present invention is used to keep time scheme, first to GPS's
1pps pulse per second (PPS) carries out Frequency Synchronization and Phase synchronization to the 32.768kHz pulse of RTC, after 1pps blackout, utilizes school
Pulse after just is kept time, and can increase the temporal information of nanosecond on the basis of the internal register of RTC, is greatly improved automatically
The punctual precision of gasifying device.
Compared with scheme C in background technology, the automation equipment of the present invention is used to keep time scheme, the RTC's of employing
Output pulse frequency precision is ± 3.5ppm in industrial scale, due to common crystal oscillator, has additionally used FPGA and has carried out this
Step-by-step counting carries out frequency correction and phasing, and CPU has only to carry out retaking of a year or grade in the moment of 1s, greatly reduces CPU
Load, improve the operational efficiency of CPU.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The technology of the industry
Personnel, it should be appreciated that the present invention is not restricted to the described embodiments, simply illustrating this described in above-described embodiment and description
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these become
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and
Equivalent defines.
Claims (2)
1. the punctual method of automaton high accuracy, it is characterised in that specifically include following step:
(1), after automaton powers on, FPGA reads temporal information from RTC, and is saved in internal 32 bit time depositors；
(2) start to detect whether the outside time service pulse of GPS, if external GPS pulse exists, turn to step (3), if
GPS pulse does not exists, and turns to step (5)；
(3) judging whether GPS second pulse loses during time service, without loss, FPGA directly detects in GPS second pulse
Rising edge and each GPS rising edge time, and turn to step (6), if lost, preservation gps time, to RTC, then judges RTC arteries and veins
Rush the most synchronize with GPS pulse, if synchronizing, turning to step (2), if asynchronous, turning to step (4)；
(4) FPGA safeguards internal counter SysTimeCnt by detection GPS second rising edge of a pulse, when GPS second pulse rises
Along arrive, read SysTimeCnt value, simultaneously reset carry out next time calculating, then calculating 32.768KHz Yu GPS pulse per second (PPS) it
Between phase and frequency relation, thus reach external GPS pulse and 32.768KHz pulse frequency and Phase synchronization；
(5) FPGA starts to count the 32.768KHz pulse of RTC, represents 1 when count value is equal to 32767+Coff_Reg
Second, then turn to step (6)；
(6) internal system time register value adds 1, then produces CPU interrupt requests, and CPU interrupts after receiving interrupt requests
Process, after obtaining the nanoseconds information that FPGA sends whole time second and the therein enumerator come, carry out system time more
Newly.
The punctual method of automaton the most according to claim 1 high accuracy, it is characterised in that in step (1), FPGA from
RTC reads temporal information by I2C bus.
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107577140A (en) * | 2017-09-14 | 2018-01-12 | 国电南瑞科技股份有限公司 | A kind of synchronised clock management module based on FPGA |
| CN108414841A (en) * | 2018-03-09 | 2018-08-17 | 黄建钟 | A kind of pulse per second (PPS) stable measurement device |
| CN109150351A (en) * | 2017-06-27 | 2019-01-04 | 许继集团有限公司 | A kind of UTC time realization method and system applied to substation |
| CN109274517A (en) * | 2018-07-23 | 2019-01-25 | 中通服咨询设计研究院有限公司 | A kind of GPS standby system and method |
| CN109391799A (en) * | 2017-08-14 | 2019-02-26 | 杭州海康威视数字技术股份有限公司 | A kind of monitor video synchronous method, device and video capture device |
| CN109581859A (en) * | 2018-10-18 | 2019-04-05 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of automatic correcting time method and device |
| CN110244635A (en) * | 2019-06-24 | 2019-09-17 | 中国航空无线电电子研究所 | With the remote data concentrator for calculating forwarding time function |
| CN110908272A (en) * | 2019-12-20 | 2020-03-24 | 昆明理工大学 | 1pps pulse signal timing method |
| CN111598727A (en) * | 2020-07-23 | 2020-08-28 | 国网江西省电力有限公司电力科学研究院 | Method for improving metering clock synchronization of intelligent substation based on code phase counting method |
| CN111830892A (en) * | 2019-04-22 | 2020-10-27 | 新疆金风科技股份有限公司 | Wind generating set statistical time calibration method and device and storage medium |
| CN112319498A (en) * | 2020-10-12 | 2021-02-05 | 武汉蓝星科技股份有限公司 | Method and system for reducing power consumption of electronic equipment based on GPS |
| CN112558685A (en) * | 2020-12-11 | 2021-03-26 | 南京四方亿能电力自动化有限公司 | Time synchronization method for power distribution terminal modules |
| CN112731790A (en) * | 2020-12-07 | 2021-04-30 | 江阴长仪集团有限公司 | Method for improving RTC (real time clock) calibration precision based on time domain segmented interpolation compensation |
| CN113259035A (en) * | 2020-03-26 | 2021-08-13 | 安徽智芯能源科技有限公司 | Clock synchronization method |
| CN113377060A (en) * | 2021-08-13 | 2021-09-10 | 成都博宇利华科技有限公司 | Method for acquiring sampling time of each sampling point in signal acquisition system |
| CN114609891A (en) * | 2022-03-10 | 2022-06-10 | 深圳市轱辘车联数据技术有限公司 | Method and device for determining time, electronic equipment and storage medium |
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| CN109150351A (en) * | 2017-06-27 | 2019-01-04 | 许继集团有限公司 | A kind of UTC time realization method and system applied to substation |
| CN109150351B (en) * | 2017-06-27 | 2021-02-02 | 许继集团有限公司 | UTC time implementation method and system applied to transformer substation |
| CN109391799B (en) * | 2017-08-14 | 2020-09-04 | 杭州海康威视数字技术股份有限公司 | Monitoring video synchronization method and device and video acquisition equipment |
| CN109391799A (en) * | 2017-08-14 | 2019-02-26 | 杭州海康威视数字技术股份有限公司 | A kind of monitor video synchronous method, device and video capture device |
| CN107577140A (en) * | 2017-09-14 | 2018-01-12 | 国电南瑞科技股份有限公司 | A kind of synchronised clock management module based on FPGA |
| CN107577140B (en) * | 2017-09-14 | 2019-11-05 | 国电南瑞科技股份有限公司 | A kind of synchronised clock management module based on FPGA |
| CN108414841A (en) * | 2018-03-09 | 2018-08-17 | 黄建钟 | A kind of pulse per second (PPS) stable measurement device |
| CN109274517A (en) * | 2018-07-23 | 2019-01-25 | 中通服咨询设计研究院有限公司 | A kind of GPS standby system and method |
| CN109274517B (en) * | 2018-07-23 | 2022-04-08 | 中通服咨询设计研究院有限公司 | GPS backup system and method |
| CN109581859A (en) * | 2018-10-18 | 2019-04-05 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of automatic correcting time method and device |
| CN111830892A (en) * | 2019-04-22 | 2020-10-27 | 新疆金风科技股份有限公司 | Wind generating set statistical time calibration method and device and storage medium |
| CN110244635A (en) * | 2019-06-24 | 2019-09-17 | 中国航空无线电电子研究所 | With the remote data concentrator for calculating forwarding time function |
| CN110908272A (en) * | 2019-12-20 | 2020-03-24 | 昆明理工大学 | 1pps pulse signal timing method |
| CN110908272B (en) * | 2019-12-20 | 2021-04-13 | 昆明理工大学 | 1pps pulse signal timing method |
| CN113259035A (en) * | 2020-03-26 | 2021-08-13 | 安徽智芯能源科技有限公司 | Clock synchronization method |
| CN111598727A (en) * | 2020-07-23 | 2020-08-28 | 国网江西省电力有限公司电力科学研究院 | Method for improving metering clock synchronization of intelligent substation based on code phase counting method |
| CN112319498A (en) * | 2020-10-12 | 2021-02-05 | 武汉蓝星科技股份有限公司 | Method and system for reducing power consumption of electronic equipment based on GPS |
| CN112731790A (en) * | 2020-12-07 | 2021-04-30 | 江阴长仪集团有限公司 | Method for improving RTC (real time clock) calibration precision based on time domain segmented interpolation compensation |
| CN112731790B (en) * | 2020-12-07 | 2021-12-03 | 江阴长仪集团有限公司 | Method for improving RTC (real time clock) calibration precision based on time domain segmented interpolation compensation |
| CN112558685A (en) * | 2020-12-11 | 2021-03-26 | 南京四方亿能电力自动化有限公司 | Time synchronization method for power distribution terminal modules |
| CN112558685B (en) * | 2020-12-11 | 2024-05-10 | 南京四方亿能电力自动化有限公司 | Method for synchronizing time between power distribution terminal modules |
| CN113377060A (en) * | 2021-08-13 | 2021-09-10 | 成都博宇利华科技有限公司 | Method for acquiring sampling time of each sampling point in signal acquisition system |
| CN114609891A (en) * | 2022-03-10 | 2022-06-10 | 深圳市轱辘车联数据技术有限公司 | Method and device for determining time, electronic equipment and storage medium |
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