CN106451763A - A station-level bus network system of intelligent substation without global synchronization system - Google Patents

Abstract

The invention provides an intelligent substation-level bus network system without requiring a global synchronous system. The intelligent substation-level bus network system without requiring the global synchronous system comprises a distributed type synchronous substation-level bus transmission network, IEEE 1588 main clock-based merging unit equipment, switch intelligent auxiliary intelligent terminal equipment and IEEE 1588-based adaptive relay protection secondary equipment, wherein the distributed type synchronous substation-level bus transmission network is a substation-level network which consists of an industrial exchanger supporting a transparent clock protocol; the IEEE 1588 main clock-based merging unit equipment performs independent sampling and sends SV sampling value messages based on beat of the self-owned clock in certain time, wherein the sending time of the sampling value messages is random; the switch intelligent auxiliary intelligent terminal equipment comprises a main transformer in the substation and intelligent proxy equipment of switch primary equipment; and the IEEE 1588-based adaptive relay protection secondary equipment realizes a synchronous sampling function of multiple non-synchronous sampling value data.

Description

A station-level bus network system of intelligent substation without global synchronization system

technical field

The invention belongs to the technical field of intelligent substations, and in particular relates to a station-level bus network system of an intelligent substation without a global synchronization system.

Background technique

According to the description and requirements of the IEC 61850 substation communication network and system standard, the equipment of the intelligent substation integrated automation system is arranged in three layers according to its functions: process layer, interval layer, and station control layer. In the long run, the substation network structure will be gradually improved in three stages, namely, point-to-point mode, process layer bus mode, process bus and station control layer bus merger, that is, "station-level bus" mode.

In the smart substation network, the core content is that equipment such as bay layer protection measurement and control devices need to realize synchronous acquisition and processing of the voltage and current of each phase in the same bay or across bays of the access device, such as line protection, main transformer protection, and busbar protection. The sampling data of each input needs to be synchronized, and the synchronization of sampling data is also particularly important for the identification and processing of a device failure. Due to the limitation of the maturity and stability of sampling value network synchronization technology, in current engineering applications, the scheme of station control layer MMS network, SV sampling value network, and GOOSE network layered independent configuration is mostly used, and sampling value transmission mostly adopts point-to-point In the way of direct sampling, GOOSE mostly adopts the coexistence of point-to-point direct jump and network trip control; among them, the sampling value network transmission and process layer bus scheme based on global synchronization has a small number of pilot applications, and has not yet been applied in a large number of projects.

The current three-in-one network transmission scheme of smart substation based on the global synchronization system is shown in Figure 1. The station provides a standard clock, that is, an external synchronization system, and accepts GPS/Beidou satellite time synchronization. The station uses the optical fiber B code or IEEE1588 through the global synchronization system In the time synchronization mode, a unified pulse signal is provided to equipment such as sampling value sending equipment (merging unit) and protection measurement and control equipment in the station. The synchronization of data acquisition and output synchronization is realized based on the unified pulse signal between each sampling value output device, and the sampling value receiving device performs sampling and restoration of the sampling value data based on the unified pulse signal, and realizes the synchronization of the sampling value by judging whether the packet serial numbers are the same. FIG. 1 is a schematic diagram of a three-network integration network structure of a substation based on a global synchronization system in the prior art.

In the sampled value network transmission mode based on the external synchronization system, the message sent by the sampled value output device is controlled by a unified pulse signal. When the unified pulse signal arrives, the output devices will send their respective sampled value messages to the network switch at the same time; since the flow of single-channel sampled value data messages is generally greater than 3Mb/s, when there are many intervals between the sampled value output devices, The instantaneous data traffic on a single port of the switch is huge, which easily leads to data forwarding queuing, resulting in a large switch forwarding delay, and the short delay of forwarding is affected by the random change of port traffic, and the synchronization problem of sampled data is prominent, which affects the system. Stable operation. In addition, the synchronization reliability of the sampling value of the system is determined by the reliability of the globally unique external synchronization system clock. When the external synchronization system loses the satellite time synchronization, the synchronization system uses the accumulated error generated by the high-stable crystal oscillator to reduce the sampling value of the output device. Sampling synchronization and accuracy also have an impact. In addition, when the link of the external synchronization system is disconnected or fails, the entire sampling value synchronization system will not work normally, which will affect the safe and stable operation of the entire integrated system.

At present, there is also a sampling value network transmission scheme based on the measurable transmission delay of the sampling value message. This scheme uses a self-defined delay measurable switch. When leaving the switch, a uniform time stamp (time stamp) is marked on the sampled value message, and the protection measurement and control device can calculate the time that the sampled value message passes through the switch through the difference between the time stamps of the message entering and leaving the switch. Delay ΔT, so that the accurate time of sending out the sampling value message at each interval can be traced back, and then the synchronized cross-interval sampling data can be obtained through interpolation. This solution uses non-standard industrial switches: automatically identify the sampled value message and only time stamp the sampled value; and destroy the integrity of the IEC61850-9 sampled value message: the original sampled value message does not Contains timestamp information. This solution considers adding timestamp information to the two reserved words of the message, which makes the international standard non-standardized, and the standardization degree of the solution is obviously regressed, and the universality is not strong.

Therefore, the existing smart substation engineering application mode in which the station control layer network, sampling value network, and GOOSE network are separately networked in the smart substation requires a large number of secondary equipment and a large number of external interfaces. The network structure of the system and the configuration of optical fiber links It is complex, the resources in the station cannot be shared, the cost of equipment development and project implementation is high, and it is not easy to transform and expand. The sampling value synchronization system based on the external synchronization system relies on the globally unique external synchronization clock system, and its operation stability is relatively poor. However, the synchronization scheme of sampled values based on measurable delay destroys the message consistency of the IEC 61850 standard, and uses a custom non-standardized industrial switch, which significantly restricts the versatility and standardization of the scheme. These deficiencies have seriously restricted the development of smart substation technology, and have not fully utilized the technical advantages of the IEC 61850 international technical standard to meet the needs of future substation technology development.

Contents of the invention

The purpose of the present invention is to provide a smart substation station-level bus network system that does not need to rely on a global sampling synchronization clock source and has universal applicability without a global synchronization system, so as to meet the needs of stable and reliable data transmission after the integration of smart substation networks.

The technical solution of the present invention is as follows: A smart substation station-level bus network system without a global synchronization system includes: a distributed synchronous substation station-level bus transmission network: a substation station-level network composed of general industrial switches supporting the transparent clock protocol, connected to All the station control layer, interval layer, and process layer equipment in the inbound station have the function of transmitting MMS messages, GOOSE messages and SV sampling value message data in the smart substation without the need for a global synchronization system to share the network; based on the combination of IEEE1588 master clocks Unit equipment: IEEE 1588 master clock that runs freely according to the local crystal oscillator frequency, independently samples and regularly sends SV sampling value messages according to its own clock beat, and the sending time of sampling value messages is random; switch intelligent auxiliary intelligent terminal equipment: use GOOSE The message form realizes the remote signal collection and remote execution of the main transformer and switch, and includes the intelligent proxy equipment of the main transformer and the primary equipment of the switch in the substation; the secondary equipment of relay protection based on IEEE 1588 self-adaptation: capable of receiving from the station level Multiple sampling values of the bus network output the SV sampling value data of the device, realize the synchronous sampling function of multiple asynchronous sampling value data, and include: multiple IEEE 1588 slave clock interface modules that can be automatically expanded according to the master clock device configuration, sampling Value data receiving and processing module, self-adaptive multi-channel value data synchronous sampling module without global synchronous sampling; it also has the functions of receiving, processing and controlling the sending of GOOSE message data, as well as the ability to communicate with the background host and communication management machine in the station based on MMS report function of text communication.

Preferably, the distributed synchronous substation station-level bus transmission network is composed of a substation station-level bus transmission network through a general industrial switch, merging unit equipment, relay protection secondary equipment, and intelligent terminal equipment; the substation station-level bus transmission network Each merging unit device on the network sends sampling value messages according to its own beat, and the time when multiple devices send sampling value messages to the network switch is random. This mechanism balances the load distribution on the network and avoids the same sampling value during global external synchronization. The huge instantaneous traffic sent at any time; the switch supports the transparent clock protocol; the intelligent terminal sends and receives the corresponding GOOSE message according to the standard requirements; at the same time, the relay protection secondary equipment communicates with the communication management machine in the station and the background with MMS messages to realize In-site automation functions.

Preferably, the merging unit device based on the IEEE 1588 master clock implements one IEEE 1588 master clock in each merging unit device, which is fixed to run in the MASTER state described in the standard, and freely runs on an internal clock without accepting external synchronization , and does not need to participate in the standard optimal clock selection logic; there is no timing coordination requirement between sampling value output devices; this device outputs sampling value messages according to the second equal division period of the master clock according to the configuration.

Preferably, the switch intelligent auxiliary intelligent terminal device is an agent device for the main transformer interval and the switch interval intelligence, and converts the remote signal of the main transformer interval and the switch interval into GOOSE and sends it to the station-level bus network , and accept the switch tripping and closing and remote opening and closing commands based on the GOOSE message sent by the relay protection equipment to realize the intelligent control of the switch.

Preferably, the IEEE 1588-based adaptive relay protection secondary equipment can receive the sampled value data and synchronization from the sampled value output device forwarded by the general industrial switch through a single physical interface connected to the station-level bus network of the substation Message information to realize synchronous sampling of multiple asynchronous sampling value data; receive and send GOOSE signals to realize remote signaling information collection and switch control; carry out MMS communication with communication management machine and background to realize remote signaling, telemetry, Upload and display of fault and alarm information.

Preferably, the multi-IEEE 1588 slave clock interface module that can be automatically expanded according to the configuration of the master clock device, the sampling value receiving device implements multiple IEEE 1588 slave clocks on a single physical port, and each slave clock conforms to only the slave clock in the standard Requirements, and the slave clock is configured to fixedly track the master clock in a sampled value output device, without participating in the standard optimal clock selection logic, the time of each slave clock of the receiving device is only related to the time of the corresponding master clock, and the time between the slave clocks The corresponding requirements without timing coordination are independent of each other.

7. The intelligent substation station-level bus network system without global synchronization system according to claim 1, characterized in that: the sampling value data receiving and processing module can selectively receive the sampling value report from the communication interface according to the equipment configuration Text, lock and track the data source, adaptively eliminate the delay jitter caused by the forwarding of the sampled value data message through the general industrial switch, analyze and cache the corresponding sampled value data in a point-by-point movable dynamic data window.

Preferably, the self-adaptive multi-channel non-synchronous sampling value data synchronous sampling module obtains the relative time of each IEEE 1588 slave clock in the device when the independent sampling pulse arrives by setting an independent sampling pulse in the sampling value receiving device, Calculate the corresponding equal-divided synchronous pulse number, use the time difference between the slave clocks and the sampling rated delay to obtain the relative relationship between the sampling data packets between the sampling value sending devices; use the point-by-point movable dynamic data window for different data pairs The data source performs self-adaptive backtracking interpolation to calculate the sampling data at the same time, and realizes the synchronization of the sampling data of multiple sampling value data output devices without external synchronization in a sampling value receiving device.

The beneficial effect of the present invention is that: the intelligent substation station-level bus network system without the global synchronization system supports the common network transmission of SV sampling values, GOOSE messages, and MMS messages based on IEC 61850-9-2, and can be used for intelligent In the substation, realize the standardized networking access of digital relay protection devices, electric energy meters, power quality monitoring devices, fault recording devices, etc. A convenient and effective solution.

Description of drawings

Fig. 1 is a schematic diagram of a substation three-network integration network structure based on a global synchronization system in the prior art;

FIG. 2 is a schematic structural diagram of a station-level bus network system of an intelligent substation without a global synchronization system provided by an embodiment of the present invention;

Fig. 3 is a block diagram of realizing the network transmission technology based on distributed synchronization of SV sampling value.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Unless the context clearly states otherwise, the number of elements and components in the present invention can exist in a single form or in multiple forms, and the present invention is not limited thereto. It can be understood that the term "and/or" used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

Please refer to FIG. 2 , which is a schematic structural diagram of a station-level bus network system of an intelligent substation without a global synchronization system provided by an embodiment of the present invention. The intelligent substation station-level bus network system that does not require a global synchronization system includes: a distributed synchronous substation station-level bus transmission network, a merging unit device based on the IEEE 1588 master clock, intelligent switch auxiliary intelligent terminal equipment, and an IEEE 1588-based self-adaptive Relay protection secondary equipment.

Among them, the distributed synchronous substation station-level bus transmission network is a substation station-level network composed of general-purpose industrial switches supporting the transparent clock protocol. The MMS message, GOOSE message and SV sampling value message data do not need the function of global synchronization system sharing network transmission. Specifically, the distributed synchronous substation station-level bus transmission network forms a substation station-level bus transmission network through general industrial switches, merging unit equipment, relay protection secondary equipment, and intelligent terminal equipment; the substation station-level bus transmission network Each merging unit device on the network sends sampling value messages according to its own beat, and the time when multiple devices send sampling value messages to the network switch is random. This mechanism balances the load distribution on the network and avoids the same sampling value during global external synchronization. The huge instantaneous traffic sent at any time; the switch supports the transparent clock protocol; the intelligent terminal sends and receives the corresponding GOOSE message according to the standard requirements; at the same time, the relay protection secondary equipment communicates with the communication management machine in the station and the background with MMS messages to realize In-site automation functions.

The merging unit device based on the IEEE 1588 master clock has an IEEE1588 master clock that runs freely at the local crystal oscillator frequency, independently samples and regularly sends SV sample value messages according to its own clock beat, and the sending time of the sample value messages is random. Specifically, the merging unit device based on the IEEE 1588 master clock implements one IEEE1588 master clock in each merging unit device, which is fixed to run in the MASTER state described in the standard and freely runs on an internal clock without accepting external synchronization. It also does not need to participate in the standard optimal clock selection logic; there is no timing coordination requirement between sampling value output devices; this device outputs sampling value messages according to the second equal division period of the master clock according to the configuration.

The switch intelligent auxiliary intelligent terminal equipment realizes the remote signal collection and remote control execution of the main transformer and the switch in the form of GOOSE messages, and includes the intelligent agent equipment of the main transformer and the switch primary equipment in the substation. Specifically, the switch intelligent auxiliary intelligent terminal device is an agent device for the main transformer interval and the switch interval intelligence, and converts the remote signaling of the main transformer interval and the switching interval into GOOSE and sends them to the station-level bus network , and accept the switch tripping and closing and remote opening and closing commands based on the GOOSE message sent by the relay protection equipment to realize the intelligent control of the switch.

The secondary equipment for relay protection based on IEEE 1588 self-adaptation has the function of receiving SV sampled value data from multiple sampled value output devices of the station-level bus network to realize synchronous sampling of multiple asynchronous sampled value data, including: Multiple IEEE 1588 slave clock interface modules that can be automatically expanded according to the configuration of the master clock device, sampled value data receiving and processing module, adaptive multi-channel sampling value data synchronous sampling module without global synchronization; moreover, it also has the ability to receive, process and control the sending of GOOSE message data The function, as well as the function of communicating with the background host and communication management machine in the station based on MMS messages.

Specifically, the IEEE 1588-based self-adaptive relay protection secondary equipment can receive the sampled value data and synchronization from the sampled value output device forwarded by the general industrial switch through a single physical interface connected to the station-level bus network of the substation. Message information to realize synchronous sampling of multiple asynchronous sampling value data; receive and send GOOSE signals to realize remote signaling information collection and switch control; carry out MMS communication with communication management machine and background to realize remote signaling, telemetry, Upload and display of fault and alarm information.

Moreover, the multi-IEEE 1588 slave clock interface module that can be automatically extended according to the configuration of the master clock device, the sampled value receiving device implements multiple IEEE 1588 slave clocks on a single physical port, and each slave clock meets the requirements of only slave clocks in the standard , and the slave clock is configured to track the master clock in a certain sampling value output device, without participating in the standard optimal clock selection logic, the time of each slave clock of the receiving device is only related to the time of the corresponding master clock, and there is no The corresponding requirements for timing coordination are independent of each other.

The sampling value data receiving and processing module can selectively receive the sampling value message from the communication interface according to the equipment configuration, lock and track the data source, and adaptively eliminate the delay jitter generated by the sampling value data message being forwarded by the general industrial switch , parse and cache the corresponding sampling value data into a point-by-point movable dynamic data window.

It should be noted that, in the smart substation station-level bus network system provided in this embodiment without the need for a global synchronization system, the merging unit in the smart substation collects signals from traditional/electronic voltage and current transformers, and converts the collected The data of each channel is synchronized to form a sampling value package; one IEEE1588 master clock is implemented in each merging unit, which is fixed to run in the MASTER state, and does not need to accept external synchronization for free operation. This device outputs the sampling value message strictly according to the second equal division cycle interval of the main clock, and outputs it to the process layer sampling value network.

Moreover, the intelligent terminal in the intelligent substation realizes the remote signaling signal collection of the main transformer interval and the switch interval, converts it into a GOOSE signal and transmits it to the network, and receives protection tripping and closing, remote control opening and closing commands from other protection measurement and control devices , to realize the digital intelligent switch control.

The sampling data receiving device (such as protection measurement and control device, electric energy meter, etc.) receives the sampling value message and clock message of the corresponding interval sampling value output device (such as the merging unit) from the process layer sampling value network, and after data analysis and self-adaptive synchronization After processing, the corresponding functions of protection measurement and control or electric energy measurement are realized.

The protection measurement and control device realizes information interaction with the backstage of the station and the communication management terminal through the MMS protocol through the collected remote signaling signal, measured power, remote control execution information, equipment alarm information, protection action alarm information, etc.

Please refer to FIG. 3 , which is a block diagram of realizing the network transmission technology based on distributed synchronization of SV sampling values. In this embodiment, the device completes the sampling value data collection with the corresponding interval merging unit through the Ethernet interface module, and obtains the equal-interval original data conforming to the IEC61850-9 standard; The high-precision clock synchronization function of the main clock of the merging unit; through frequency tracking, the beat synchronization between the merging unit and the data receiving module is guaranteed. Through the time difference between the merging units, the movable dynamic data window is used to store the sampling value packet data of each channel of data, and the source data is retroactively interpolated to obtain the synchronization data required for protection, measurement and control calculations. The interval voltage and current data are sent to the CPU through the data bus for the next step of data processing.

Compared with the prior art, the intelligent substation station-level bus network system provided by the present invention does not require a global synchronization system, supports the common network transmission of SV sampling values, GOOSE messages, and MMS messages based on IEC 61850-9-2, and can be used In the smart substation, realize the standardized networking access of digital relay protection devices, electric energy meters, power quality monitoring devices, fault recording devices, etc. Standardization provides a convenient and effective solution.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (8)

1. the intelligent substation station level bus network system without global synchronization system, it is characterised in that include：

Distributed synchronization Substation Station level bus transfer network：It is made up of the universal industrial switch supporting transparent clock agreement Transformer station's station level network, all of station level, wall, process layer devices in access station, there is the MMS report in intelligent substation Literary composition, GOOSE message and SV sampling value message data are without the function of global synchronization system common network transmission；

Combining unit equipment based on IEEE 1588 master clock：Have by the IEEE 1588 of local crystal oscillator frequency free-running operation main Clock, independent sample simultaneously sends SV sampling value message by own timeticks timing, and it is random that sampling value message sends the time；

Switch intellectuality auxiliary intelligent terminal：Realize the state-signal collection of main transformer and switch, distant with GOOSE message form Control performs, and includes main transformer and the intelligent agent equipment switching primary equipment in transformer station；

Based on IEEE 1588 adaptive relay protection secondary equipment：Possess the multiple samplings receiving from station level bus network The SV sample values of value output equipment, it is achieved the function of the synchronized sampling of multiple non-synchronous sampling Value Datas, and include：Can root According to many IEEE 1588 of clock equipment configuration automatically extension from clock interface module, sample values receiving processing module, adaptive Answer multichannel without global synchronization sample values synchronized sampling module；But also possess reception processing and control sends GOOSE message The function of data, and the function based on MMS message communication between interior background host computer and communication manager that possesses and stand.

2. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：Described distributed synchronization Substation Station level bus transfer network, by universal industrial switch and combining unit equipment, continues Electric protection secondary device, intelligent terminal composition Substation Station level bus transfer network；Described Substation Station level bus transfer On network, each combining unit equipment sends sampling value message by own beat, and multiple equipment rooms send sampling value message to network The time of switch is random, and this mechanism makes the load distribution on network equalize, it is to avoid during overall outer synchronization, sampled value is with a period of time Carve the huge instantaneous delivery sending；Switch supports transparent clock agreement；Intelligent terminal requires to send according to standard and receives phase The GOOSE message answered；Carry out communication with MMS message between communication manager and backstage in relay protection secondary equipment and station simultaneously, Realize automation function in station.

3. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：The described combining unit equipment based on IEEE 1588 master clock, realizes 1 IEEE 1588 in each combining unit equipment Master clock, fixes and operates in MASTER state described in standard, and free-running operation is on certain internal clocking, it is not necessary to accept outer synchronization, also not The optimal clock that need to participate in standard selects logic；Require without time cooperation between sampled value output equipment；This equipment is pressed according to configuration The second of license-master's clock etc. point period distances output sampling value message.

4. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：Described switch intellectuality auxiliary intelligent terminal, is main transformer interval, the intelligentized agent equipment of switch gap, The remote signalling at main transformer interval, the remote signalling of switch gap are transferred to GOOSE and send to the level bus network of station, and accept relay protection and set For the switch breaker tripping and closing based on GOOSE message sent here, remote control divide-shut brake order, it is achieved the intelligentized control method of switch.

5. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：Described based on IEEE 1588 adaptive relay protection secondary equipment, can be by being connected to Substation Station level bus network On single physical interface, receive the sample values of sampled value output equipment forwarding from universal industrial switch and synchronization Message information, it is achieved the synchronized sampling of multiple non-synchronous sampling Value Datas；Receive and send GOOSE signal, it is achieved remote signalling information Collection and the control of switch；Carry out MMS communication with communication manager and backstage, it is achieved remote signalling, remote measurement, fault, announcement in standing The upload of alarming information shows.

6. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：Described can configure many IEEE 1588 of automatically extension according to clock equipment and receive equipment from clock interface module, sampled value Realize that multiple IEEE 1588, from clock, respectively meets, from clock, the requirement being only standard from clock on the single physical port, and from clock It is configured to the fixing master clock followed the tracks of in certain sampled value output equipment, it is not necessary to the optimal clock participating in standard selects logic, connects Receiving unit each only relevant with the corresponding master clock time from clock time, without the corresponding requirement of time cooperation between clock, separate.

7. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：Described sample values receiving processing module, can be configured with, according to equipment, the sampling selectively receiving from communication interface Value message, locking tracking data source, what self adaptation elimination sample values message forwarded through universal industrial switch and produced prolongs When shake, resolve and corresponding sample values is cached to pointwise may move in dynamic data window.

8. the intelligent substation station level bus network system without global synchronization system according to claim 1, its feature It is：Described self-adaptive multi-path is without outer synchronized sampling Value Data synchronized sampling module, by arranging in sampled value reception equipment Independent sample pulse, it is thus achieved that in equipment, each IEEE 1588 is from clock at the relative time in independent sample pulse arrival moment, converts Go out corresponding decile lock-out pulse sequence number, utilize each time difference between clock and sampling normal delay, obtain each sampled value Send the relativeness of equipment room sampled data parlor；Pointwise is used to may move the data in dynamic data window to different pieces of information source Carry out self adaptation backtracking interpolation, calculate the sampled data of synchronization, it is achieved multiple sample values without outer synchronization are defeated Go out synchronization in a sampled value reception equipment for the equipment sampled data.