CN104468247A - Method and device for acquiring networking transmission network time delay of sampling value of intelligent transformer substation - Google Patents
Method and device for acquiring networking transmission network time delay of sampling value of intelligent transformer substation Download PDFInfo
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Abstract
The invention provides a method for acquiring the networking transmission network time delay of the sampling value of an intelligent transformer substation. The sampling value is transmitted in the form of a message. The method comprises the following steps: initializing the filling value of a message reservation field into 0; allowing the message to enter a switch for performing network transmission, and recording an entrance time point at which the message enters the current switch and a transmission time point at which the message leaves the current switch respectively; acquiring the retention time of the message in the current switch, overlapping the retention time with data in the reservation field, and replacing the data in the reservation field; judging whether the message arrives at a target position or not, and if so, carrying out a next step; otherwise, searching for a next switch and returning; and acquiring data in the reservation field to obtain a total network time delay value. The invention further relates to a device for implementing the method. The method and the device for acquiring the networking transmission network time delay of the sampling value of the intelligent transformer substation have the beneficial effects that networking transmission can be performed in asynchronous sampling, and the network time delay can be determined.
Description
Technical field
The present invention relates to Substation control field, particularly a kind of acquisition methods of intelligent substation sampled value networking transmission network time delay and device.
Background technology
Current intelligent substation sampling value message has two kinds of transmission meanss: one is networking transmission, and two is point-to-point transmission.Networking transmission has can adopt the advantages such as randomly topologically structured, data sharing relative to point-to-point transmission, has broken away from point-to-point transmission physical circuit and has connected restriction that is dumb, that not easily expand.But current networking transmission technology requires that sample devices (as electric mutual inductor) carries out synchronized sampling; due to synchronized sampling require outside high precision clock to carry out pair time; add equipment complexity and maintenance cost; if equipment clock asynchronous causing produces phase difference during the resampling of protected location data; cause the erroneous judgement of protected location, cause adverse consequences.Non-synchronous sampling carries out networking, and to transmit the difficult problem run into be that network transfer delay is uncertain, and current, the sample values of non-synchronous sampling can not networking transmission.
Summary of the invention
The technical problem to be solved in the present invention is, for prior art above-mentioned non-synchronous sampling can not networking transmission, the uncertain defect of network delay, provide a kind of non-synchronous sampling energy networking to transmit, acquisition methods and the device of the intelligent substation sampled value networking transmission network time delay of network delay can be determined.
The technical solution adopted for the present invention to solve the technical problems is: the acquisition methods constructing a kind of intelligent substation sampled value networking transmission network time delay, described sampled value is transmitted with the form of message, described message comprises reserved field, and described acquisition methods comprises the steps:
A) Filling power of described reserved field is initialized as 0;
B) described message carries out Internet Transmission through switch, records described message respectively and enters the entry time point of current SWITCH and leave the transmitting time point of current SWITCH;
C) residence time of described message in described current SWITCH is obtained according to described entry time point and transmitting time point, and the data of will replace after the data investigation in described residence time and described reserved field in described reserved field;
D) judge whether described message arrives target location, in this way, perform step e); Otherwise, find next switch and return step B);
E) namely the data obtained in described reserved field obtain network delay total value.
In the acquisition methods of intelligent substation sampled value networking transmission network time delay of the present invention, described step B) in obtain described entry time point by recording first of the described message moment arriving switch, and the moment leaving described switch by recording described start of heading obtains described transmitting time point.
In the acquisition methods of intelligent substation sampled value networking transmission network time delay of the present invention, described step C) in residence time equal the difference of described transmitting time point and described entry time point.
In the acquisition methods of intelligent substation sampled value networking transmission network time delay of the present invention, in described steps A) also comprise pre-treatment step before:
A0) electric current and the voltage data that gather described intelligent substation obtain sampled value;
A1) message of described sampled value is sent to merge cells to carry out process and obtain specified time delay, and described specified time delay is recorded in the first character section of message data collection.
In the acquisition methods of intelligent substation sampled value networking transmission network time delay of the present invention, in described step e) after also comprise step:
F) described specified time delay is added with described network delay total value, and obtains the original moment of sampling in order to complete waveform resampling according to the value after being added.
The invention still further relates to a kind of device realizing the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay, described sampled value is transmitted with the form of message, and described message comprises reserved field, and described device comprises:
Initialization unit: for the Filling power of described reserved field is initialized as 0;
Time point record cell: for making described message carry out Internet Transmission through switch, records described message respectively and enters the entry time point of current SWITCH and leave the transmitting time point of current SWITCH;
Data replacement unit: for obtaining the residence time of described message in described current SWITCH according to described entry time point and transmitting time point, and the data of will replace after the data investigation in described residence time and described reserved field in described reserved field;
Target location judging unit: for judging whether described message arrives target location, and find next switch when arriving;
Network transfer delay acquiring unit: namely obtain network delay total value for the data obtained in described reserved field.
Realize in the device of the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay of the present invention, first moment arriving switch by recording described message in described time point record cell obtains described entry time point, and the moment leaving described switch by recording described start of heading obtains described transmitting time point.
Realize in the device of the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay of the present invention, the residence time in described data replacement unit equals the difference of described transmitting time point and described entry time point.
, also comprise in the device of the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay of the present invention realization:
Collecting unit: electric current and voltage data for gathering described intelligent substation obtain sampled value;
Specified time delay acquiring unit: carry out process obtain specified time delay for the message of described sampled value being sent to merge cells, and described specified time delay is recorded in the first character section of message data collection.
, also comprise in the device of the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay of the present invention realization:
Time is added and resampling unit: for described specified time delay being added with described network delay total value, and extrapolates the original moment of sampling in order to complete waveform resampling according to the value obtained after addition.
Implement acquisition methods and the device of intelligent substation sampled value networking transmission network time delay of the present invention, there is following beneficial effect: owing to starting to enter the moment of switch by recorded message and starting to leave the moment of switch, and obtain message residence time in a switch thus, residence time and the data in reserved field are carried out superposing and the value obtained after superposing is replaced the data in reserved field, by message through the residence time of all switches all superpose after just obtain network delay total value, so its non-synchronous sampling energy networking transmission, network delay can be determined.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of message format in the acquisition methods of intelligent substation sampled value networking transmission network time delay of the present invention and device embodiment;
Fig. 2 is the principle schematic that in described embodiment, networking propagation delay time calculates;
Fig. 3 is the flow chart of acquisition methods in described embodiment;
Fig. 4 is the flow chart of pre-treatment step in described embodiment;
Fig. 5 is the schematic diagram of packet network propagation delay time acquisition methods in described embodiment;
Fig. 6 is the structural representation of the device of the acquisition methods realizing intelligent substation sampled value networking transmission network time delay in described embodiment;
Fig. 7 is the structural representation of switch in described embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In the acquisition methods and device embodiment of intelligent substation sampled value networking transmission network time delay of the present invention, intelligent substation sampled value (Sample Value is called for short SV) message adopts ethernet frame format carrying.Fig. 1 is the schematic diagram of message format in the present embodiment, wherein, SV ethernet frame format has the reserved field of 4 bytes, Reserved1 and Reserved2 is reserved field, agreement specifies that this reserved field is used in special occasions and retains use, in the present embodiment, use this reserved field stored messages network transfer delay numerical value.It is worth mentioning that, this kind of time delay storage means is also applicable to GOOSE message form.As shown in Figure 1, header has the message of 22 bytes to protected field.
Fig. 2 is the principle schematic that in the present embodiment, networking propagation delay time calculates, as shown in Figure 2, SV sampling value message through network transfer delay Computing Principle be exactly specifically after electric mutual inductor is sampled to transformer station's electric current, voltage data, data are sent to merge cells (Merge Unit, be called for short MU), merge cells carries out process to data and obtains specified time delay, and is recorded in the first character section of SV message data collection.Message, again through switch network transmission, uses related algorithm to calculate network transfer delay, and is recorded in SV message reserved field as shown in Figure 1.Protected location, by specified time delay and network transfer delay superposition, can be back-calculated to obtain the original moment that message gathers, thus complete resampling.It is worth mentioning that, in the present embodiment, electric mutual inductor and merge cells have three groups, if first in Fig. 2 group is the first electric mutual inductor and the first merge cells, second group is the second electric mutual inductor and the second merge cells, and the 3rd group is the 3rd electric mutual inductor and the 3rd merge cells.Certainly, the group of electric mutual inductor and merge cells is several can adjust accordingly according to actual conditions.Switch in the present embodiment is 3, is respectively switch A, switch b and switch C, and as the case may be, the number of switch also can adjust accordingly.
Wherein, switch has hardware timestamping logging modle, for recording time point when switch receives message and sends message; Have residence time computing module (comprising hardware and software), for calculating the residence time of message at switch; Local and external clock source module is had, for switch timing in switch.
In the present embodiment, intelligent substation uses optical fiber to carry out message transmissions, and the transmission speed of optical fiber is 2/3 light velocity, it is far longer than line length, by formula: time=distance/speed, the message transmission time on the line can be calculated, its value is very little, is ignored in Practical Calculation.
Fig. 3 is the flow chart of the acquisition methods of intelligent substation sampled value networking transmission network time delay in the present embodiment, and in the present embodiment, sampled value is transmitted with the form of message, and this message comprises reserved field, and in Fig. 3, this acquisition methods comprises the steps:
The Filling power of reserved field is initialized as 0 by step S01: in this step, and message enters the initial condition of switch network, specifies that its reserved field Filling power is initialized as 0, namely the initial value in reserved field is set to 0 according to IEC61850 agreement.
Step S02 message carries out Internet Transmission through switch, recorded message enters the entry time point of current SWITCH and leaves the transmitting time point of current SWITCH respectively: in this step, message carries out Internet Transmission through switch, and at this moment recorded message enters the entry time point in current SWITCH moment and leaves the transmitting time point of current SWITCH moment (switch transmission message) respectively.Be obtain entry time point by first moment starting to arrive switch of recorded message in this step, and obtain transmitting time point by the moment that recorded message starts to leave switch.Be exactly specifically that message is linked into network through switch, when the first bit of message arrives switch, record its due in Tr; Leave switch moment when start of heading, recorded message leaves switch moment Tt.
Step S03 obtains the residence time of message in current SWITCH according to entry time point and transmitting time point, and the data of will replace after the data investigation in residence time and reserved field in reserved field: in this step, the residence time of message in current SWITCH can be obtained according to entry time point and transmitting time point, and superposed with the data in reserved field by this residence time, and replace the data in reserved field by the data obtained after superposition.In the present embodiment, residence time equals the difference of transmitting time point and entry time point.Be exactly specifically calculate the residence time △ t of message at current SWITCH, △ t=Tt-Tr.Obtain message reserved field original dwell time values △ r, and it is superposed with △ t, obtain current message casual network propagation delay time △ s, △ s=△ r+ △ t, then cover message reserved field field with △ s.
In the present embodiment, message sends from head, the moment (i.e. transmitting time point Tt) of message first bit is sent from switch, to sending the reserved field field moment, this time interval very limited (22 bytes/port line-speed), but above-mentioned calculating to be completed at this moment, therefore adopt the mode effective implemention of software and hardware combining.
Step S04 judges whether message arrives target location: in this step, judge whether message arrives target location, namely judge whether message is sent to target location by a paths in network, this target location can be protected location, in this step, if the result judged is yes, then perform step S06; Otherwise, perform step S05.
Step S05 finds next switch: if the judged result of above-mentioned steps S04 is no, then perform this step.In this step; message leaves switch; if do not arrive destination and protected location; find next switch; message enters next switch and processes; execute this step, return step S02, also namely then superpose message successively at the dwell time values of new switch according to the method for step S02-S04 and forward.
Namely the data that step S06 obtains in reserved field obtain network delay total value: it is protected location that message arrives at the destination; now the value of message reserved field field is network transfer delay value; in this step; namely the data obtained in reserved field obtain network delay total value; the superposition value of the residence time of message in all switches due to what store in reserved field, so what finally obtain is network delay total value.Acquisition methods of the present invention can the network transfer delay of accurate Calculation sampling value message, makes protected location still accurately reliably can complete the resampling of electric current, voltage data when the networking of non-synchronous sampling data is transmitted; When synchronized sampling, can verify the correctness of synchronised clock, precision can reach nanosecond (ns) rank.
In the present embodiment, execution of step S06, this acquisition methods also comprises:
Specified time delay is added with network delay total value by step S07; and obtain the original moment of sampling in order to complete waveform resampling according to the value after being added: in this step; specified time delay is added with network delay total value by protected location; instead can release the original moment of electronic transducer sampling, complete waveform resampling.This acquisition methods only needs the reserved field of protected location identification Ethernet message to obtain network transfer delay value; electric mutual inductor carries out sampling message networking transmission when data sampling asynchronous can be realized; breach the restriction that current data sampling asynchronous message can not carry out networking transmission, and it also have the advantages such as compatible good, precision is high, applicability good (arbitrary network topology, multiple message format).
In the present embodiment, before step S01, also comprise pre-treatment step, pre-treatment step comprises:
Electric current and the voltage data of step S001 collection intelligent substation obtain sampled value: in this step, the electric current and the voltage data that gather intelligent substation obtain sampled value.In the present embodiment, be obtain sampled value by the electric current of electric mutual inductor collection intelligent substation and voltage data.
The message of sampled value is sent to merge cells by step S002 to carry out process and obtains specified time delay, and specified time delay is recorded in the first character section of message data collection: in this step, the message of sampled value is sent to merge cells to carry out process and obtain specified time delay, and specified time delay is recorded in the first character section of message data collection, in the present embodiment, also carry out resampling by multiple merge cells, the number of merge cells is consistent with the number of electric mutual inductor.Like this, by merge cells, message is delivered to switch network.
Fig. 5 is the schematic diagram of packet network propagation delay time acquisition methods in the present embodiment, records its time value respectively, and calculates the residence time of message at switch thus, and residence time is write the reserved field of message when message turnover switch.Message, through multiple switch, superposes the dwell time values through each switch.Finally, when message leaves network arrival protected location, the dwell time values recorded in message reserved field is the propagation delay time total value of message through whole network.
The present embodiment also relates to a kind of device realizing the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay, and sampled value is transmitted with the form of message, and message comprises reserved field, and the structural representation of this device as shown in Figure 6.In Fig. 6, this device comprises initialization unit 1, time point record cell 2, data replacement unit 3, target location judging unit 4 and network transfer delay acquiring unit 5; Wherein, initialization unit 1 is for being initialized as 0 by the Filling power of reserved field; Time point record cell 2 carries out Internet Transmission for making message through switch, and recorded message enters the entry time point of current SWITCH and leaves the transmitting time point of current SWITCH respectively; Data replacement unit 3 is for obtaining the residence time of message in current SWITCH according to entry time point and transmitting time point, and the data of will replace after the data investigation in residence time and reserved field in reserved field; Target location judges that 4 for judging whether message arrives target location, and finds next switch when arriving; Namely network transfer delay acquiring unit 5 obtains network delay total value for the data obtained in reserved field.It is worth mentioning that, arrive moment of switch by first of recorded message in time point record cell 2 and obtain entry time point, and obtain transmitting time point by the moment that recorded message starts to leave switch.Residence time in data replacement unit 3 equals the difference of transmitting time point and entry time point.
Under the certain situation of the present embodiment, this device also comprises collecting unit 6, specified time delay acquiring unit 7 and time addition and resampling unit 8; Wherein, collecting unit 6 obtains sampled value for the electric current and voltage data gathering intelligent substation; Specified time delay acquiring unit 7 carries out process obtain specified time delay for the message of sampled value being sent to merge cells, and is recorded in the first character section of message data collection by specified time delay; Time addition and resampling unit 8 for specified time delay being added with described network delay total value, and extrapolate the original moment of sampling in order to complete waveform resampling according to the value obtained after addition.
Fig. 7 is the structural representation of switch in the present embodiment, in Fig. 7, switch has hardware acceptance timestamp logging modle and hardware transmitting time stamp logging modle, and time point when receiving for recorded message and send, so that determine the residence time of message at current SWITCH.This switch also has residence time hardware computing module and residence time software computing module, for calculating the residence time of message at current SWITCH, and realizes residence time overlaying function, obtains message from entering network to the overall delay through current SWITCH.If message leaves current SWITCH and arrives destination and protected location, the time delay value that now protected location analytic message reserved field obtains is network overall delay.This switch is also provided with local and external clock source module, for switch timing.It is worth mentioning that, in the present embodiment, the clock source that hardware acceptance timestamp logging modle and hardware transmitting time stamp logging modle use both can be switch local clock source, also can be external clock reference (as 1588, GPS).
In a word; in the present embodiment; adopt the reserved field storage networking time delay value of SV message; adopt the timestamp that hardware unit recorded message receives and sends; calculate the residence time of message at switch; successively superpose through its value of multiple switch, when arriving destination and protected location, the value of reserved field is the overall delay of message through network.The acquisition methods of this kind of intelligent substation sampled value networking transmission network time delay has the following advantages: (1) does not change frame format, compatible IEC61850 international norm at present, and national grid, south electric network specification, be applicable to SV sampled value and GOOSE message; (2) in the synchronous case (as 1588 when outside pair), high-precision clock source can be obtained; In nonsynchronous situation, utilize the local crystal oscillator of switch as clock source, also can reach the time precision of ns rank, such as crystal oscillator is 120MHz, then time precision is 8.3ns; (3) use the timestamp that hardware acceptance timestamp logging modle and hardware transmitting time stamp logging modle difference recorded message receive and send, its speed can exceed port line-speed, meets the demand of Quick Catch.During specific implementation, this hardware unit can be integrated into switch, also can be placed on physical layer PHY; (4) to network topology without any supposition, be applicable to arbitrary network topology, as star, annular, tree-like etc.; (3) serve many purposes: when carrying out data sampling asynchronous, this acquisition methods can be used for the calculating of sampled value networking transmission delay; When synchronized sampling, may be used for monitoring and verify sampling system and whether be in synchronous regime.Principle is as follows: if in synchronized sampling process, and lock-out occurs, and obtains packet network propagation delay time value by the method, instead pushes away its sampling instant, if result of calculation is consistent with the synchronous sequence number of the message received, then synchronous sampling system is correctly, otherwise mistake.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an acquisition methods for intelligent substation sampled value networking transmission network time delay, is characterized in that, described sampled value is transmitted with the form of message, and described message comprises reserved field, and described acquisition methods comprises the steps:
A) Filling power of described reserved field is initialized as 0;
B) described message carries out Internet Transmission through switch, records described message respectively and enters the entry time point of current SWITCH and leave the transmitting time point of current SWITCH;
C) residence time of described message in described current SWITCH is obtained according to described entry time point and transmitting time point, and the data of will replace after the data investigation in described residence time and described reserved field in described reserved field;
D) judge whether described message arrives target location, in this way, perform step e); Otherwise, find next switch and return step B);
E) namely the data obtained in described reserved field obtain network delay total value.
2. the acquisition methods of intelligent substation sampled value networking transmission network time delay according to claim 1, it is characterized in that, described step B) in obtain described entry time point by recording first of the described message moment arriving switch, and the moment leaving described switch by recording described start of heading obtains described transmitting time point.
3. the acquisition methods of intelligent substation sampled value networking transmission network time delay according to claim 2, is characterized in that, described step C) in residence time equal the difference of described transmitting time point and described entry time point.
4. the acquisition methods of the intelligent substation sampled value networking transmission network time delay according to claims 1 to 3 any one, is characterized in that, in described steps A) also comprise pre-treatment step before:
A0) electric current and the voltage data that gather described intelligent substation obtain sampled value;
A1) message of described sampled value is sent to merge cells to carry out process and obtain specified time delay, and described specified time delay is recorded in the first character section of message data collection.
5. the acquisition methods of intelligent substation sampled value networking transmission network time delay according to claim 4, is characterized in that, in described step e) after also comprise step:
F) described specified time delay is added with described network delay total value, and obtains the original moment of sampling in order to complete waveform resampling according to the value after being added.
6. realize a device for the acquisition methods of intelligent substation sampled value networking transmission network time delay as claimed in claim 1, it is characterized in that, described sampled value is transmitted with the form of message, and described message comprises reserved field, and described device comprises:
Initialization unit: for the Filling power of described reserved field is initialized as 0;
Time point record cell: for making described message carry out Internet Transmission through switch, records described message respectively and enters the entry time point of current SWITCH and leave the transmitting time point of current SWITCH;
Data replacement unit: for obtaining the residence time of described message in described current SWITCH according to described entry time point and transmitting time point, and the data of will replace after the data investigation in described residence time and described reserved field in described reserved field;
Target location judging unit: for judging whether described message arrives target location, and find next switch when arriving;
Network transfer delay acquiring unit: namely obtain network delay total value for the data obtained in described reserved field.
7. the device realizing the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay according to claim 6, it is characterized in that, first moment arriving switch by recording described message in described time point record cell obtains described entry time point, and the moment leaving described switch by recording described start of heading obtains described transmitting time point.
8. the device realizing the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay according to claim 6, it is characterized in that, the residence time in described data replacement unit equals the difference of described transmitting time point and described entry time point.
9. the device realizing the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay according to claim 6 to 8 any one, is characterized in that, also comprise:
Collecting unit: electric current and voltage data for gathering described intelligent substation obtain sampled value;
Specified time delay acquiring unit: carry out process obtain specified time delay for the message of described sampled value being sent to merge cells, and described specified time delay is recorded in the first character section of message data collection.
10. the device realizing the acquisition methods of above-mentioned intelligent substation sampled value networking transmission network time delay according to claim 9, is characterized in that, also comprise:
Time is added and resampling unit: for described specified time delay being added with described network delay total value, and extrapolates the original moment of sampling in order to complete waveform resampling according to the value obtained after addition.
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| CN111030882A (en) * | 2019-11-11 | 2020-04-17 | 国电南瑞南京控制***有限公司 | Network quality measurement method and system based on intelligent substation service message |
| CN111181867A (en) * | 2019-12-27 | 2020-05-19 | 全球能源互联网研究院有限公司 | Distributed energy message delay management method, device and equipment |
| CN111181867B (en) * | 2019-12-27 | 2022-05-17 | 全球能源互联网研究院有限公司 | Distributed energy message delay management method, device and equipment |
| CN111585895A (en) * | 2020-05-12 | 2020-08-25 | 北京交通大学 | Time-triggered data transmission method without time synchronization |
| CN111585895B (en) * | 2020-05-12 | 2021-11-09 | 北京交通大学 | Time-triggered data transmission method without time synchronization |
| CN112511375A (en) * | 2020-11-10 | 2021-03-16 | 中国南方电网有限责任公司 | Automatic testing method for GOOSE dual-network receiving mechanism of intelligent substation process layer |
| CN112511375B (en) * | 2020-11-10 | 2022-09-06 | 中国南方电网有限责任公司 | Automatic test method for intelligent substation process level GOOSE dual-network receiving mechanism |
| CN113300798A (en) * | 2021-05-27 | 2021-08-24 | 北京交通大学 | Transmission certainty access method of asynchronous terminal |
| CN113300798B (en) * | 2021-05-27 | 2022-07-01 | 北京交通大学 | Transmission certainty access method of asynchronous terminal |
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