CN100414466C - Multi-event sequential recording and testing system - Google Patents
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- CN100414466C CN100414466C CNB2005100954275A CN200510095427A CN100414466C CN 100414466 C CN100414466 C CN 100414466C CN B2005100954275 A CNB2005100954275 A CN B2005100954275A CN 200510095427 A CN200510095427 A CN 200510095427A CN 100414466 C CN100414466 C CN 100414466C
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Abstract
The present invention relates to a multi-event sequential recording and testing system, which has the technical scheme that a field CAN bus is used for carrying out communication linkage; only when an SOE event occurs on a monitored object, the occurrence time of condition deflection is recorded in sequence. The system comprises a set of GPS for providing a time marker, a main station computer for sending a clock signal A to all middle controllers, at least two middle controllers, at least two communication servers for transmitting the clock signal A to all SOE child stations to confirm and record SOE events; at least four SOE child stations, wherein one of the middle controller is selected to serve as a reference time station and send time variant signals B, C to other middle controllers and all the SOE child stations; a millisecond clock at the inner part of the SOE child station is started by the signal C to generate a millisecond clock signal D, and the millisecond clock signal D and the signal A are combined into a clock signal E of the SOE child station for distinguishing and uploading the SOE events. The present invention has the advantage that the error of synchronous and monitoring resolution is not more than 1 millisecond.
Description
Technical field
The present invention relates to monitoring, more specifically to a kind of tool multi-event sequence recording and test macro to large-scale collective and distributive type control system.
Background technology
In big-and-middle-sized distribution type control system, electric substation automation system, Automation of Hydropower Station system, often often relate to monitoring to the large number quipments state.These equipment may be switch, isolating switch, reclosing etc., and monitoring system often will be monitored the contact open and-shut mode of these equipment.In observation process, not only need to monitor the time that its state is also wanted monitoring state generation displacement simultaneously.In same system, the state generation displacement of some equipment is related each other, therefore need the time of origin of this class state displacement be detected, and we represent with the SOE logout.The English full name of SOE is SEQUENCE OFEVENT, i.e. event sequence requires to reach Millisecond to the logout resolution of SOE is general.
In above-mentioned various control system, for a large amount of SOE event monitorings to as if finish by different bottom intellectual monitoring equipment.The monitoring of this class monitor equipment status might be to concentrate on that the switch acquisition plate on the intelligent detection device (abbreviates the SOE substation as in the middle of one, down together), also might concentrate on a plurality of switch acquisition plates in the middle controller unit with (or a pair of redundancy backup each other), also may be dispersed on a plurality of switch acquisition plates of different middle controllers.
Therefore it is very accurate, also very accurate to the synchronous requirement of all basic unit's switch acquisition times simultaneously not only to require the state of institute's monitoring target for these SOE stations.The state displacement that only in this way could guarantee SOE monitored object all in the same system has same relative clock basic point, thereby the relative time clock sign of all SOE objects is accurate in the assurance system.
The following several modes of the most of employing of traditional SOE substation clock synchronization:
One, all SOE substations in the control system are concentrated under the same intermediate controlled unit, can obtain relatively accurate relative time clock markers like this, but along with the variation of monitoring target, decentralized, the use of this method in big-and-middle-sized control system receives that the restriction of total message capacity does not meet the requirement that decentralised control guarantees system reliability yet.
They are two years old, the SOE substation is dispersed in the different intermediate controlled unit, main website is by communication network (Ethernet, serial port) to middle control module carry out broadcast mode to the time, each intermediate controlled node to the SOE substation that hangs down again by the private communication mode broadcast to the time, though followed the principle of decentralised control like this, but for a large amount of intermediate controlled unit, each intermediate controlled node for main website broadcasting to the time mode and each SOE substation for the intermediate controlled node broadcasts to the time mode acceptance response all have time-delay in addition lose broadcast message may, the clock synchronization error that reach each SOE substation 1ms with interior be very difficult.
On the other hand, the contained byte long of communication message.Is example with middle controller with the broadcast mode to the SOE substation, and the private communication message adopts the MODBUS communication protocol, and baud rate 115.2K, communication message comprise about 10 bytes such as broadcasting command, check code, broadcast address, clock.The road transmission time (road of not very communicating by letter delay) is approximately 0.8ms.Although and the SOE substation can with to broadcasting to the time order be made as interrupt response authority highest level, SOE substation CPU is to interrupt response, the packet parsing of this broadcast communication message
(comprising verification), markers cover and take approximately also between 0.5～1.5ms.Here still do not consider correctly not receive broadcasting to the time signal situation, institute takes time greatly about about 1.3～2.5ms.Simultaneously, in the centre of broadcasting to the period, all SOE substations are by clock internal (this clock can be that external clock chip also can be the internal clocking that CPU produces by the work crystal oscillator) timing, lengthening along with the airtime section, inevitably there are cumulative errors in this SOE substation internal clocking, and this cumulative errors minute more than will reach the number in addition tens of microseconds.Obviously, this mode is difficult to also accomplish that all SOE substation relative clock errors are no more than 1ms.
Its three, a cover gps system is set in system, its advantage is that synchronization accuracy is very high, but the outlet of this system is limited, if all SOE substations all directly and this gps system to the time will make system cost also become very high.
Summary of the invention
Primary and foremost purpose of the present invention is, makes each SOE substation be not more than 1 millisecond for the monitoring record resolution of relevant monitoring target state displacement time, and all the SOE substation time synchronization errors under the same system are not more than 1 millisecond, and system's low cost of manufacture.
Secondary objective of the present invention is, makes the communication port load optimization of all SOE substations and corresponding middle controller and middle controller and main station system.
Above-mentioned purpose is achieved through the following technical solutions:
Adopt Field Bus CAN to communicate connection, only when the SOE incident takes place monitoring target, the time of origin of its state displacement is carried out journal, this system comprises:
One cover GPS device connects master station computer by communication, provides the time tag signal of gps clock to it;
A master station computer is a benchmark with described time tag signal, at each whole second clock signal A that sends continuously more than whole second that carves, and by communication modes to middle controller carry out broadcast mode to the time;
At least two middle controllers, clock signal A is sent to the corresponding communication server by communication modes, in all middle controllers, select one as standing reference time, stand with clock signal A this reference time is benchmark, each whole second carve send continuously to the time signal B and to the time signal C, and be sent to other middle controller and all SOE substations by corresponding hard contact circuit;
At least two communication servers, with clock signal A by communication modes to all SOE substations carry out broadcast mode to the time, establish a communications link with pairing middle controller and all SOE substations that are associated respectively, confirm, write down the SOE incident, and make SOE logout pointer point to bar record down automatically;
At least four SOE substations, according to clock signal C, start SOE substation inner millisecond clock timing, produce millisecond clock signal D and be merged into SOE substation complete clock signal E with clock signal A, whether monitoring target the SOE incident is taken place is differentiated, produce as the SOE incident, form the SOE logout of displacement state and corresponding clock signal E, and pass through the communication mode active upload.
Wherein said clock signal A is a certain relatively messages containing clock information of target accumulative total second difference when historical, described to the time signal B and to the time signal C be to be 1 second impulse level signal in the cycle.
Wherein said middle controller is respectively equipped with input, the output port of two pulse switch amounts at least, be used between the middle controller to the time between the contact input of signal B and the middle controller to the time signal B contact output, and between middle controller and the SOE substation to the time signal C contact export.
Wherein as described reference time the station middle controller can match another middle controller, both are redundancy backup each other.
The middle controller of wherein said two Hot Spares of standing reference time each other to the time signal contact output port respectively with shielding line be connected to all other middle controller to the time contact point signal input port; Each middle controller to the time signal contact output port respectively with shielding line be connected to all described SOE substation special uses that are associated to the time contact input port.
Wherein master station computer is connected with the middle controller communication by gateway, and by Ethernet interface send to the time signal A.
Wherein said GPS device links to each other with the serial ports of master station computer.
Wherein adopting bus to outreach mode or outer enlarging mode between middle controller and the contact manager communicates and is connected.
Wherein said master station computer is that the IBM_PC machine of holding concurrently holds machine, adopts DOS6.0 or WINDOWS or LINUX or WINCE operating system.
Beneficial effect of the present invention: 1) station reference time is set, system with this station time for to the time benchmark, will to the time be divided into a whole second above clock and millisecond clock two parts the time, adopt software communication transmission and hard contact electric signal transmission mode respectively, thereby the synchronous error of the system of assurance is not more than 1 millisecond, and cheap; 2) adopt the regularly object of the monitored SOE incident of interrupt inquiry of high primary frequency CPU, guaranteed the accurate monitoring when each SOE substation is to institute's monitoring target state displacement, be not more than 1 millisecond of high resolving power requirement thereby reach monitoring record resolution; 3) utilize the principal and subordinate's each other of all nodes on the fieldbus unique property, have only for the SOE incident and just the logout active upload is given corresponding middle controller and main station system under the situation of generation state displacement to guarantee the load optimization of communication port, a target accumulative total second difference is explained when adopting with a certain history with the clock infomational message, significantly reduced the expression byte of SOE logout, stopped up the problem that causes network paralysis thereby solved the message that causes because of the SOE incident preferably.
Description of drawings
Fig. 1 is the structural representation block diagram of system of the present invention
Fig. 2 is the structural representation block diagram of SOE substation circuit module
Fig. 3 is the workflow diagram of SOE substation
Fig. 4 is a SOE substation break in service process flow diagram
Fig. 5 is the structural representation block diagram of communication server circuit module
Fig. 6 is the workflow diagram of the communication server
Embodiment
Contrast Fig. 1, native system adopt a GPS device, master station computer, two pairs totally four middle controllers (each is to being redundant each other controller, in practical application, importance according to system can be redundant configuration, also can dispose for nonredundancy) and the communication server and four SOE substations of four correspondences.
In the present embodiment, the GPS device has the RS232 interface and links to each other with master station computer serial ports in the system, communicates connection by RS232 communication protocol, provides the time tag signal of gps clock to it.Middle controller is connected with master station computer by gateway (HUB), master station computer is large-scale IBM PC compatible, operating system can adopt a kind of among DOS6.0, WINDOWS, LINUX, the WINCE, obtain the time tag signal of gps clock by corresponding software from the RS232 serial ports, this time tag signal is the messages containing clock information that is accurate to millisecond.Master station computer is a benchmark with this time tag signal, sends the clock signal A of whole second above messages containing clock information continuously, and sends to by network interface too and to be articulated in on all too online middle controllers of redundancy.
Middle controller adopts PC104 standard industry controller, use the PC104 bus to outreach or outer enlarging mode with the corresponding communication server and communicate connection.Each middle controller is sent to the corresponding communication server with the whole second above clock signal A that is obtained by data bus or communication bus, and the communication server adopts broadcast mode to hang over this online SOE substation by IO communication redundancy network transmission down to all continuously.(selecting which middle controller is station reference time as standing reference time to select one in all middle controllers, generally set by related software) according to actual conditions, stand with clock signal A this reference time is benchmark, each whole second for constantly send continuously to the time signal B and to the time signal C, to the time signal B with to the time signal C be to be 1 second, the different impulse level signal of level in the cycle.They respectively the hard contact circuit of the I/O switching value output port by reference time station be sent to other middle controller and all SOE substations.So middle controller is respectively equipped with input, the output port of two pulse switch amounts at least, be used between the middle controller to the contact output between input of the contact of clock signal B and the middle controller to clock signal B, and between middle controller and the SOE substation to the time signal C contact export.
On the network other middle controller according to reference time, sent at the station to the time signal B calibration millisecond time difference separately.Each SOE substation according to reference time, sent at the station to the time signal C start inner millisecond elapsed time clock, produce millisecond elapsed time clock signal D and be merged into SOE substation complete clock signal E with clock signal A.The clock of all SOE substations all adopt same way as from each self-corresponding middle controller by hardware to the time basic point and software network broadcasting to the time obtain and pack.
Owing to no matter be that the response that middle controller and SOE substation processing IO port interrupt all can be very fast, be generally several microseconds, therefore this clock basic point postpones and can ignore, and second above information is by the network service broadcast mode, broadcast mode is that double broadcasting is to guarantee that broadcasting command can accurately be issued to each child node, though there is communication delay in each child node, the time difference that receives is Millisecond just.And in the control system clock millisecond counting of all control module and SOE substation by independently finishing separately.Though considering the millisecond clock of each child node inside can regulate very accurate, but cumulative errors can cause the timing error of each substation Millisecond for a long time, therefore stand in reference time each constantly sent in whole second to the time signal so that all child nodes are in time calibrated inner millisecond clock skew, make that the clock skew cumulative errors of all child nodes can not be greater than 1 millisecond, and the above information of millisecond that all child nodes obtain adds that own inner millisecond information has just obtained being accurate to the complete clock information of Millisecond.
In order to guarantee reliability of system operation, under the situation at many middle controllers station, can select two middle controllers as the redundancy backup of standing reference time.Two middle controllers of present embodiment have all matched another middle controller, and both are redundancy backups in real time each other, so that wherein each middle controller all can be used as the reference time station at any time and uses.For prevent to the time signal time be subjected to external interference in transmission, the middle controller of the Hot Spare of standing reference time each other to the time signal contact output port respectively with shielding line be connected to all other middle controller to the time contact point signal input port; Each middle controller to the time signal contact output port respectively with shielding line be connected to all described SOE substation special uses that are associated to the time contact input port.
The most outstanding advantage of the present invention just is to be provided with above-mentioned station reference time.The clock reference of intrasystem like this all other middle controllers and all SOE substations all comes from stands this reference time.The basic point of all middle controllers and SOE clock timing all from this reference time the station hard contact to the time signal, whole second above information of this clock respectively by reference time the station broadcast transmission continuously by the communication network that other middle controller, communication server constituted.Formed a bit (station reference time) transmission of hardware contact clock basic point signal and the higher transmission mode of software clock information communication transmitting synchronous to multiple spot (each SOE substation).
One of advantage of the present invention is to have simplified dexterously the expression of messages containing clock information.Be about to clocking information and be expressed as relative one accumulative total of a target when historical second difference, for example set when being designated as on January 1st, 1,970 zero when historical zero second, then after each clock constantly can be expressed as target time difference when historical with respect to this, and this time difference is adopted second unit.Like this in be designated as 100 years of initial point when historical with this, each clock is constantly expressed only needs 4 bytes, has significantly reduced the statement byte of SOE incident, thereby has reduced the transmission quantity of system information, improved system's defeated efficient of breath of delivering a letter, the unimpeded condition that provides of system information passage has been provided.
The structure of the circuit module of SOE substation sees also Fig. 2 in the present embodiment, and it carries out following work according to workflow shown in Figure 3:
Whether fastener receives the affirmation use message of the communication server
Replying the fastener correct status confirms
Judged whether that the SOE incident takes place, (be accurate to person of outstanding talent second) packing record and the active upload of complete time if any, the SOE state-event when taking place and when taking place.
Acceptance is read effective marker and SOE incident storage pointer is pointed to next bar from the SOE incident of the communication server.
Two of advantage of the present invention is, utilizes the function of CAN fieldbus, guarantees the communication port optimization.Because the SOE incident is not that generation is arranged always, therefore middle controller, contact manager all the SOE substation information of scanning of at every turn communicating by letter will strengthen network traffic when having the SOE substation in a large number, therefore make full use of the function of CAN fieldbus, each SOE substation is packaged into complete SOE logout active upload with the state that takes place on the communication server and middle controller with corresponding clock sign only when the SOE incident produces.The communication server and middle controller are accurately accepted to return acknowledgement frame by communication message behind this SOE logout.As not producing acknowledgement frame, then this breath is continued to repeat to upload in the SOE substation.After the SOE incident accurately transmitted, SOE substation logout pointer pointed to bar logout down automatically.The transmission that had so both guaranteed SOE information is reliable, effectively reduces the data traffic of communication network again.
The SOE substation produces regularly interrupt inquiry to the relevant device status monitoring by innernal CPU, the CPU of SOE substation adopts high frequency CPU, between interrupt timing be 1 millisecond, thereby the state resolution that guarantees these all monitorings of SOE substation is not more than 1 millisecond, its workflow sees also Fig. 4.
The structure of the circuit module of the communication server sees also Fig. 5 in the present embodiment, and it carries out following work according to workflow shown in Figure 6:
Internal bus is accepted above time message second that middle controller is transmitted
This message is sent to down the SOE substation that hangs by the broadcast communication mode
Remove former to the time markers, prepare to accept above time message second that new middle controller is transmitted
Judge whether the SOE substation that hangs down uploads the SOE event flag
If any, accept SOE logout and storage
Sending the SOE incident exists sign to wait for that middle controller reads the SOE incident
Middle controller reads effective back and sends the SOE substation of clear flag to correspondence
The present invention can be by following method validation its SOE substation status monitoring resolution and synchronous error:
1, producing frequency by pulse signal generator is that 10 pulse trains of 1KHz are with checking SOE substation status monitoring resolution.
The SOE substation should guarantee to obtain the information of 20 state variation.
2, producing frequency by pulse signal generator is that 10 pulse trains of 10Hz are with checking SOE substation inner ms clock cumulative errors.
Period error between the state variation that the SOE substation obtains should be not more than 100 ± 2ms.
3, producing frequency by pulse signal generator is that 10 pulse trains of 10Hz are input to different SOE substation different middle controllers under respectively simultaneously to verify SOE state-event, markers accuracy.
The time scale difference of the state displacement that the SOE substation that different middle controllers are hung down obtains is not more than 2ms.
Claims (9)
1. multi-event sequence recording and test macro adopt Field Bus CAN to communicate connection, only it is characterized in that when monitoring target the SOE incident takes place is event sequence, and the time of origin of monitoring target state displacement is carried out journal, and this system comprises:
One cover GPS device connects master station computer by communication, provides the time tag signal of gps clock to it;
A described master station computer is a benchmark with described time tag signal, at each whole second clock signal A that sends continuously more than whole second that carves, and by communication modes to middle controller carry out broadcast mode to the time;
At least two described middle controllers, clock signal A is sent to the corresponding communication server by communication modes, in all described middle controllers, select one as standing reference time, stand with clock signal A this reference time is benchmark, each whole second carve send continuously to the time signal B and to the time signal C, and be sent to other middle controller and all SOE substations by corresponding hard contact circuit;
At least two described communication servers, with clock signal A by communication modes to all SOE substations carry out broadcast mode to the time, establish a communications link with pairing described middle controller and all SOE substations that are associated respectively, confirm, write down the SOE incident, and make SOE logout pointer point to bar record down automatically;
At least four described SOE substations, according to the time signal C, start described SOE substation inner millisecond clock timing, produce millisecond clock signal D and be merged into described SOE substation complete clock signal E with clock signal A, whether described monitoring target the SOE incident is taken place is differentiated, produce as the SOE incident, form the SOE logout of displacement state and corresponding clock signal E, and pass through the communication mode active upload.
2. a kind of multi-event sequence recording according to claim 1 and test macro, it is characterized in that described clock signal A is a certain relatively messages containing clock information of target accumulative total second difference when historical, described to the time signal B and to the time signal C be to be 1 second impulse level signal in the cycle.
3. a kind of multi-event sequence recording according to claim 1 and test macro, it is characterized in that described middle controller is respectively equipped with the output port of the input of two pulse switch amounts, two pulse switch amounts at least, be used between the middle controller to the time between the contact input of signal B and the middle controller to the time signal B contact output, and between middle controller and the SOE substation to the time signal C contact export.
4. a kind of multi-event sequence recording according to claim 1 and test macro, that middle controller that it is characterized in that being used as described reference time of station can match another middle controller, and both are redundancy backup each other.
5. a kind of multi-event sequence recording according to claim 4 and test macro, it is characterized in that described two Hot Spares of standing reference time each other middle controller to the time signal contact output port respectively with shielding line be connected to all other middle controller to the time contact point signal input port; Each middle controller to the time signal contact output port respectively with shielding line be connected to all described SOE substation special uses that are associated to the time contact input port.
6. a kind of multi-event sequence recording according to claim 1 and test macro is characterized in that master station computer is connected with the middle controller communication by gateway, and by Ethernet interface tranmitting data register signal A.
7. a kind of multi-event sequence recording according to claim 1 and test macro is characterized in that described GPS device links to each other with the serial ports of master station computer.
8. a kind of multi-event sequence recording according to claim 1 and test macro is characterized in that adopting between middle controller and the communication server bus to outreach mode or outer enlarging mode and communicate and be connected.
9. a kind of multi-event sequence recording according to claim 1 and test macro is characterized in that described master station computer is the IBM PC compatible, adopt DOS6.0 or WINDOWS or LINUX or WINCE operating system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101958785A (en) * | 2009-07-17 | 2011-01-26 | 中国科学院沈阳计算技术研究所有限公司 | Transfer time difference-based numerical control system on-site bus time synchronization method and device |
| CN101958785B (en) * | 2009-07-17 | 2013-01-02 | 中国科学院沈阳计算技术研究所有限公司 | Transfer time difference-based numerical control system on-site bus time synchronization method and device |
| CN101788785B (en) * | 2009-12-28 | 2012-06-06 | 国电南京自动化股份有限公司 | Method for recording action time for time setting system for ETS system of steam turbine |
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