CN102801557A - Systematic method for improving network sampling reliability of transformer station - Google Patents
Systematic method for improving network sampling reliability of transformer station Download PDFInfo
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- CN102801557A CN102801557A CN2012102652316A CN201210265231A CN102801557A CN 102801557 A CN102801557 A CN 102801557A CN 2012102652316 A CN2012102652316 A CN 2012102652316A CN 201210265231 A CN201210265231 A CN 201210265231A CN 102801557 A CN102801557 A CN 102801557A
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Abstract
The invention relates to a systematic method for improving network sampling reliability of a transformer station. The method comprises the following steps: (1) high-precision synchronous timing of a sampling step; (2) uniformly-spaced transmission of a sample sending step; (3) optimally designing a network transmission step; (4) and resampling received sample data by a sample receiving device, uniformly processing the sample data. The method can consider uniformly from a systematic level, and solve problems of timing synchronization of network sampling, network transmission delay, and data processing when a message is lost or delayed. The method not only can improve reliability of network sampling, effectively improve precision of sampling synchronization and reduce network transmission delay, but also can effectively response to problems of handling protecting devices, and measuring and controlling devices in a condition that the message is lost or delayed. The method can effectively guide construction of the transformer station, and promote application of the network sampling technology in the transformer stations.
Description
Technical field
The present invention relates to the systems approach in a kind of power automation field, be specifically related to a kind of systems approach that improves transformer station's network sampling reliability.
Background technology
The use of IEC61850 standard has promoted the development of process layer bussing technique; And promote transformer station's network service to develop into the Ethernet transmission from serial ports connection, fieldbus; Greatly improved the integral level of transformer substation communication,, effectively reduced transformer station's complicated cable wiring because sampled data can realize the data sharing of standing entirely after through Network Transmission; Not only help simplifying full station structure; Simultaneously can also effectively reduce the construction cost of transformer station, the even more important development that can promote transformer station's ADVANCED APPLICATIONS function further improves the aggregate level of transformer station.
In the digital transformer substation construction period; Because it is not high to each art maturity such as sample-synchronous, network design, sampling reception processing; Though the network sampling has obtained the pilot application but general effect is unsatisfactory; Synchronous and the Network Transmission of sampled data postpones to have brought tremendous influence to the protection measure and control device, and sampling message dropping that especially often occurs or delay reach, and protective device all fails effectively to handle.Therefore, the network sampling is not effectively promoted after pilot.
In May, 2009; Proposition along with State Grid Corporation of China's intelligent grid development construction plan; The target of transformer station's development is from now on turned in the development of intelligent substation into; The embodiment of intelligent substation level then mainly concentrates on based on transformer station and stands entirely on the ADVANCED APPLICATIONS of data sharing, realizes that this key of problem then is the network sampling that transformer station is inner.From the situation of intelligent substation pilot project construction, the traditional cable connection has still been adopted at the great majority station, though also there are many pilot projects to adopt the network sampling; But only limit to measure and control device; Protective device still is in the state of suspection to network sampling, and it adopts through point-to-point mode and connect, and has not only increased full station difficulty of design and complexity; Simultaneously also increase overall input, be unfavorable for intelligent substation development construction from now on.
Summary of the invention
Use the problem that exists to the internal network sampling of current transformer station; The present invention provides a kind of systems approach that improves transformer station's network sampling reliability; This method can solve network sampling to the time stationary problem, Network Transmission latency issue and to message dropping or postpone the handling problem of back data; Not only can improve the reliability of network sampling, effectively improve the sample-synchronous precision and reduce the Network Transmission time-delay, can also successfully manage the handling problem of protection, measure and control device under situation such as sampling message dropping or delay simultaneously; Can effectively instruct transformer substation construction, promote the application of network Sampling techniques in transformer station.
The objective of the invention is to adopt following technical proposals to realize:
A kind of systems approach that improves transformer station's network sampling reliability, its improvements are that said method comprises the steps:
(1) high-precise synchronization of sampling element to the time;
(2) the uniformly-spaced transmission of sampling sending link;
(3) the Network Transmission link is optimized design;
(4) the sampling receiving equipment resamples to the sampled data that receives, and sampled data is carried out Unified Treatment.
Wherein, in the said step (1), said high-precise synchronization to the time comprise network to the time, high-precise synchronization sampling clock generation circuit design and the punctual circuit design of high accuracy.
Wherein, It is characterized in that; Said network to the time based on the IEEE1588 standard, (sampling apparatus is exactly the merge cells in the transformer station, and its realization is based on the IEEE1588 standard through sampling apparatus; Promptly adopt to support the CPU of IEEE158 standard or the DP83640 network chip of the TI of Texas Instrument) setting of innernal CPU or DP83640 network chip (CPU or DP83640 network chip are all supported the IEEE1588 standard), realize the wonderful level of sampling apparatus sub-micro to the time precision.
Wherein, (constant-temperature crystal oscillator mainly is the accuracy that is used for guaranteeing the clock operation in the cooperation of said high-precise synchronization sampling clock generation circuit employing constant-temperature crystal oscillator and FPGA; FPGA is used for the timed sending sampling pulse to electronic mutual inductor, and the frequency of its transmission is carried out spread spectrum through crystal oscillator, and promptly the frequency of electrical network has only 50Hz; Each cycle 20ms; But actual samples frequency possibility 4000Hz/ cycle, crystal oscillator is exactly the accuracy that is used for guaranteeing this 4000Hz, reduces the discreteness between its double sampling pulse as far as possible); The punctual circuit of said high accuracy adopts the deviation of sampling apparatus clock and external clock and compensates through said constant-temperature crystal oscillator.
Wherein, In the said step (2); The mode that the sending link of sampled data adopts DSP-FPGA-VxWorks to combine; FPGA sends sampling pulse and accepts the original sampling data that electronic mutual inductor returns, and FPGA writes CPU with it afterwards, and original sampling data is handled based on the group bag of IEC61850-9-2 standard and in the VxWorks real time operating system of CPU, accomplished; The message of will sampling afterwards writes in the dual port RAM of DSP and FPGA, DSP utilize its regularly interrupt timing send sampled data after reading the message of dual port RAM;
Said VxWorks real time operating system is embedded among the said CPU.
Wherein, in the said step (3), the Network Transmission link is optimized design comprises:
1) structure of sampling network adopts stelliform connection topology configuration, adopts 100-M network Ethernet, and each 100,000,000 network switch inserts the gigabit networking switch through Star Network again; Said 100,000,000 network switchs are access devices of gigabit networking switch; Said sampling apparatus is the access device of 100,000,000 network switchs;
2) said sampling network reduces the quantity that each port is transmitted conversion sampling message respectively through the different VLAN that respectively divide of said 100,000,000 network switchs and gigabit networking switch ports themselves access device, reduces the message queue time-delay; Or
Whole sampling network also can pass through the IEEE802.1ak-2007 standard, realizes the automatic division of VLAN through multicast message log-in protocol MMRP, realizes the dynamic adding of equipment in the virtual network and withdraws from.
Wherein, the sampling message of transmission Network Based is followed the IEEE802.1P standard, adopt the priority setting in the sampling message, and the priority of messages of sampling is set to 4.
Wherein, whole sampling network is followed the IEC62439 standard, adopts redundancy communication network agreement PRP that whole sampling network is carried out Redundancy Design.
Wherein, in the said step (4), the sampling receiving equipment resamples to the sampled data that receives, and sampled data is carried out Unified Treatment comprise:
A, when sample devices is in the time synchronized state, receiving equipment can be filled in the buffering area of each sampling data passageway of receiving equipment according to the order that receives respectively; Or
When sample devices lose outside to the time when synchronous, receiving equipment can be arranged according to the sampling period, and with identical sampling period same time series (and synchronization or same time period) sampled data is handled;
B, after the unified alignment of sampling message, can convert sampled data to 32 points/cycle and carry out fast Fourier and calculate, obtain the effective value of sampled data.
Wherein, When the sampling message causes sampling individually message dropping or delay arrival owing to network reason (exchange fault, network blockage etc.); Receiving equipment can adopt Lagranges parabolic interpolation in three rank to carry out interpolation calculation, with the calculated value after the interpolation calculation as the sampled data of losing sampled data a little or delaying time and putting.
Wherein, When the sampling message in continuous 10 sampling intervals is not received; Receiving equipment is changed to unusual sampling channel and alarm; For protective device (protective device is a kind of of sampling receiving system) the relevant defencive function of sampled value therewith of locking simultaneously then,, and remain unchanged for measure and control device (measure and control device is a kind of of sampling receiving system) this sampled data sampled data of being set to receive at last then.
With the prior art ratio, the beneficial effect that the present invention reaches is:
1, the present invention provides a kind of systems approach that improves transformer station network sampling reliability, this method sampling element through high accuracy to the time, guarantee the high level of synchronization in sampled data and sampling time; Through uniformly-spaced sending, reduce the data transmission lag at the sampling sending link; Carry out optimized design in the Network Transmission link, reduce the Network Transmission time-delay; Resample in the Data Receiving link.Wherein sampling element comprise the IEEE1588 high accuracy to the time, sampling with high precision clock design and the punctual circuit design of high accuracy; Sending link adopts the mode of DSP-FPGA-VxWorks to realize the uniformly-spaced transmission of data; The Network Transmission link is optimized network through adopting stelliform connection topology configuration, the design of PRP double-network redundant, message priority, VLAN division and MMRP agreement; Sampling receives link and comprises normal data processing and loss of data, delay and abnormity processing.Adopt method of the present invention; Can consider from system level is unified, improve the sample-synchronous precision, reduce network delay; And can effectively handle the data under the sampling abnormal conditions; Can effectively improve the reliability of transformer station's networking level and network sampling, promote of the extensive use of network Sampling techniques, improve the intelligent level of transformer station in transformer station.
2, the systems approach that improves transformer station's network sampling reliability provided by the invention; Can consider from system level is unified; Solve the network sampling to the time stationary problem, Network Transmission latency issue and to message dropping or postpone the handling problem of back data; Not only can improve the reliability of network sampling; Effectively improve the sample-synchronous precision and reduce the Network Transmission time-delay, can also successfully manage the handling problem of protection, measure and control device under situation such as sampling message dropping or delay simultaneously, can effectively instruct transformer substation construction.
Description of drawings
Fig. 1 is the systems approach flow chart that improves transformer station's network sampling reliability provided by the invention;
Fig. 2 be sampling element provided by the invention high-precise synchronization to the time flow chart;
Fig. 3 is the flow chart that the Network Transmission link is optimized design provided by the invention;
Fig. 4 is the reception process chart of sampled data provided by the invention.
Embodiment
Do further to specify below in conjunction with the accompanying drawing specific embodiments of the invention.
The systems approach flow chart of raising provided by the invention transformer station network sampling reliability is as shown in Figure 1, and this method comprises the steps:
(1) high accuracy of sampling element to the time, guarantee the high level of synchronization of sampling apparatus time and external clock;
The high-precise synchronization of sampling element to the time comprise three aspects; The network that is based on IEEE1588 respectively to the time, the design of high-precise synchronization sampling clock, the design of the punctual circuit of high accuracy; The high-precise synchronization of sampling element provided by the invention to the time flow chart as shown in Figure 2, specific as follows:
1. the outside of sampling element to the time based on the IEEE1588 standard; (sampling apparatus is exactly the merge cells in the transformer station through sampling apparatus; Its realization is based on the IEEE1588 standard; Promptly adopt to support the CPU of IEEE158 standard or the DP83640 network chip of the TI of Texas Instrument) setting of innernal CPU or DP83640 network chip (CPU or DP83640 network chip are all supported the IEEE1588 standard), realize the wonderful level of sampling apparatus sub-micro to the time precision.
2. (constant-temperature crystal oscillator mainly is the accuracy that is used for guaranteeing the clock operation for the synchronized sampling clock sampling constant-temperature crystal oscillator of sampling apparatus and FPGA; FPGA is used for the timed sending sampling pulse to electronic mutual inductor, and the frequency of its transmission is carried out spread spectrum through crystal oscillator, and promptly the frequency of electrical network has only 50Hz; Each cycle 20ms; But the actual samples frequency maybe 4000Hz/ cycle, crystal oscillator is exactly the accuracy that is used for guaranteeing this 4000Hz, reduces the discreteness between its double sampling pulse as far as possible) cooperation; Can effectively improve the accuracy that sampling pulse sends, reduce the discrete type that sampling pulse sends.Through the deviation of calculating sampling device clock and external clock, utilize constant-temperature crystal oscillator to compensate, guarantee sampling apparatus externally to the time can in 2 hours, keep time behind the dropout, guarantee that clocking error still remains in the 1us.
(2) the uniformly-spaced transmission of sampling sending link reduces the data transmission lag;
The mode that the sending link of sampled data adopts DSP-FPGA-VxWorks to combine; FPGA sends sampling pulse and accepts the original sampling data that electronic mutual inductor returns; FPGA writes CPU with it afterwards; Original sampling data is handled based on the group bag of IEC61850-9-2 standard and in the VxWorks real time operating system of CPU, is accomplished, and the message of will sample afterwards writes in the dual port RAM of DSP and FPGA, and DSP sends sampled data after utilizing its timing interrupt timing to read the message of dual port RAM; The VxWorks real time operating system is embedded among the CPU.
(3) the Network Transmission link is carried out optimized design, reduces the Network Transmission time-delay;
Provided by the invention that the Network Transmission link is optimized the flow chart of design is as shown in Figure 3, the Network Transmission link is optimized design comprises:
1) structure of sampling network adopts stelliform connection topology configuration, adopts 100-M network Ethernet, and each 100,000,000 network switch inserts the gigabit networking switch through Star Network again; Said 100,000,000 network switchs are access devices of gigabit networking switch; Said sampling apparatus is the access device of 100,000,000 network switchs;
2) said sampling network is respectively divided VLAN through said 100,000,000 network switchs and gigabit networking switch ports themselves access device different respectively (100 m switch and gigabit switch has been formed a whole network jointly; VLAN changes branch to whole network access equipment; Exist the merge cells that inserts different 100 m switches may form a VLAN; It connects and just comprises gigabit switch), reduce the quantity that each port is transmitted conversion sampling message, reduce the message queue time-delay; Or
Whole sampling network also can pass through the IEEE802.1ak-2007 standard, realizes the automatic division of VLAN through multicast message log-in protocol MMRP, realizes the dynamic adding of equipment in the virtual network and withdraws from.
The sampling message of transmission Network Based is followed the IEEE802.1P standard, adopt the priority setting in the sampling message, and the priority of messages of sampling is set to 4.
Whole sampling network is followed the IEC62439 standard, adopts redundancy communication network agreement PRP that whole sampling network is carried out Redundancy Design.
(4) the sampling receiving equipment resamples to the sampled data that receives, and sampled data is carried out Unified Treatment;
The reception process chart of sampled data provided by the invention is as shown in Figure 4, and sampling receiving equipment (the sampling receiving equipment mainly refers to protective device and measure and control device) resamples to the sampled data that receives, and sampled data is carried out Unified Treatment comprise:
A, when sample devices is in the time synchronized state, receiving equipment can be filled in the buffering area of each sampling data passageway of receiving equipment according to the order that receives respectively; Or
When sample devices lose outside to the time when synchronous, receiving equipment can be arranged according to the sampling period, and with identical sampling period same time series (and synchronization or same time period) sampled data is handled;
B, after the unified alignment of sampling message, can convert sampled data to 32 points/cycle and carry out fast Fourier and calculate, obtain the effective value of sampled data.
Wherein, When the sampling message causes sampling individually message dropping or delay arrival owing to network reason (exchange fault, network blockage etc.); Receiving equipment can adopt Lagranges parabolic interpolation in three rank to carry out interpolation calculation, with the calculated value after the interpolation calculation as the sampled data of losing sampled data a little or delaying time and putting.
Wherein, When the sampling message in continuous 10 sampling intervals is not received; Receiving equipment is changed to unusual sampling channel and alarm; For protective device (protective device is a kind of of sampling receiving system) the relevant defencive function of sampled value therewith of locking simultaneously then,, and remain unchanged for measure and control device (measure and control device is a kind of of sampling receiving system) this sampled data sampled data of being set to receive at last then.
The present invention uses the problem that exists to the internal network sampling of current transformer station; Utilize existing engineering experience and state-of-the-art technology; A kind of systems approach that improves transformer station's networking sampling reliability has been proposed; Can effectively solve network sampling to the time stationary problem, Network Transmission latency issue and to message dropping or postpone the handling problem of back data; Not only can improve the reliability of network sampling, effectively improve the sample-synchronous precision and reduce the Network Transmission time-delay, can also successfully manage the handling problem of protection, measure and control device under situation such as sampling message dropping or delay simultaneously; Can effectively instruct transformer substation construction, promote the application of network Sampling techniques in transformer station.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (11)
1. a systems approach that improves transformer station's network sampling reliability is characterized in that said method comprises the steps:
(1) high-precise synchronization of sampling element to the time;
(2) the uniformly-spaced transmission of sampling sending link;
(3) the Network Transmission link is optimized design;
(4) the sampling receiving equipment resamples to the sampled data that receives, and sampled data is carried out Unified Treatment.
2. the systems approach that improves transformer station's network sampling reliability as claimed in claim 1; It is characterized in that; In the said step (1), said high-precise synchronization to the time comprise network to the time, high-precise synchronization sampling clock generation circuit design and the punctual circuit design of high accuracy.
3. the systems approach that improves transformer station's network sampling reliability as claimed in claim 2; It is characterized in that; Said network to the time based on the IEEE1588 standard, through the setting of sampling apparatus innernal CPU or DP83640 network chip, realize the wonderful level of sampling apparatus sub-micro to the time precision.
4. the systems approach that improves transformer station's network sampling reliability as claimed in claim 2 is characterized in that said high-precise synchronization sampling clock generation circuit adopts the cooperation of constant-temperature crystal oscillator and FPGA; The punctual circuit of said high accuracy adopts the deviation of sampling apparatus clock and external clock and compensates through said constant-temperature crystal oscillator.
5. the systems approach that improves transformer station's network sampling reliability as claimed in claim 1; It is characterized in that; In the said step (2), the mode that the sending link of sampled data adopts DSP-FPGA-VxWorks to combine, FPGA sends sampling pulse and accepts the original sampling data that electronic mutual inductor returns; FPGA writes CPU with it afterwards; Original sampling data is handled based on the group bag of IEC61850-9-2 standard and in the VxWorks real time operating system of CPU, is accomplished, and the message of will sample afterwards writes in the dual port RAM of DSP and FPGA, and DSP sends sampled data after utilizing its timing interrupt timing to read the message of dual port RAM;
Said VxWorks real time operating system is embedded among the said CPU.
6. the systems approach that improves transformer station's network sampling reliability as claimed in claim 1 is characterized in that, in the said step (3), the Network Transmission link is optimized design comprises:
1) structure of sampling network adopts stelliform connection topology configuration, adopts 100-M network Ethernet, and each 100,000,000 network switch inserts the gigabit networking switch through Star Network again; Said 100,000,000 network switchs are access devices of gigabit networking switch; Said sampling apparatus is the access device of 100,000,000 network switchs;
2) said sampling network reduces the quantity that each port is transmitted conversion sampling message respectively through the different VLAN that respectively divide of said 100,000,000 network switchs and gigabit networking switch ports themselves access device, reduces the message queue time-delay; Or
Whole sampling network also can pass through the IEEE802.1ak-2007 standard, realizes the automatic division of VLAN through multicast message log-in protocol MMRP, realizes the dynamic adding of equipment in the virtual network and withdraws from.
7. the systems approach that improves transformer station's network sampling reliability as claimed in claim 6; It is characterized in that; The sampling message of transmission Network Based is followed the IEEE802.1P standard, adopt the priority setting in the sampling message, and the priority of messages of sampling is set to 4.
8. the systems approach that improves transformer station's network sampling reliability as claimed in claim 6 is characterized in that whole sampling network is followed the IEC62439 standard, adopts redundancy communication network agreement PRP that whole sampling network is carried out Redundancy Design.
9. the systems approach that improves transformer station's network sampling reliability as claimed in claim 1 is characterized in that, in the said step (4), the sampling receiving equipment resamples to the sampled data that receives, and sampled data is carried out Unified Treatment comprise:
A, when sample devices is in the time synchronized state, receiving equipment can be filled in the buffering area of each sampling data passageway of receiving equipment according to the order that receives respectively; Or
When sample devices lose outside to the time when synchronous, receiving equipment can be arranged according to the sampling period, and with identical sampling period same time series sampled data is handled;
B, after the unified alignment of sampling message, can convert sampled data to 32 points/cycle and carry out fast Fourier and calculate, obtain the effective value of sampled data.
10. the systems approach that improves transformer station's network sampling reliability as claimed in claim 9; It is characterized in that; When the sampling message causes sampling individually message dropping or delay arrival owing to the network reason; Receiving equipment can adopt Lagranges parabolic interpolation in three rank to carry out interpolation calculation, with the calculated value after the interpolation calculation as the sampled data of losing sampled data a little or delaying time and putting.
11. the systems approach that improves transformer station's network sampling reliability as claimed in claim 9; It is characterized in that; When the sampling message in continuous 10 sampling intervals was not received, receiving equipment was changed to sampling channel unusual and alarm, for the protective device relevant defencive function of sampled value therewith of locking simultaneously then; For measure and control device this sampled data sampled data of being set to receive at last then, and remain unchanged.
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| CN113466552A (en) * | 2021-07-14 | 2021-10-01 | 南京海兴电网技术有限公司 | Frequency tracking method under constant-interval sampling |
| CN113466552B (en) * | 2021-07-14 | 2024-02-02 | 南京海兴电网技术有限公司 | Frequency tracking method under fixed-interval sampling |
| CN114124672A (en) * | 2021-10-12 | 2022-03-01 | 南方电网数字电网研究院有限公司 | Process layer double-network sampling data processing method of intelligent substation and protection device thereof |
| CN114124672B (en) * | 2021-10-12 | 2024-01-23 | 南方电网数字电网研究院有限公司 | Process layer double-network sampling data processing method and protection device for intelligent substation |
| CN114554585A (en) * | 2022-02-28 | 2022-05-27 | 南京国电南自电网自动化有限公司 | Data synchronization method for differential protection of 5G communication line |
| CN114554585B (en) * | 2022-02-28 | 2024-02-13 | 南京国电南自电网自动化有限公司 | Data synchronization method for differential protection of 5G communication line |
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