CN107819537A - It is a kind of based on synchronous closed loop monitoring electric substation automation system pair when method of calibration - Google Patents

Abstract

The invention discloses a time calibration method for a substation automation system based on synchronous closed-loop monitoring, which includes a clock device and a timed device connected through a station control layer network. The time synchronization port part, the time synchronization information transmission part, the calculation time synchronization deviation value part, the judgment abnormality and error part and the time synchronization error correction part, the time service equipment includes the station control layer equipment, the monitoring background, the PMU device, the measurement and control device, and the protection equipment , Fault recorder. The measurement and control device is connected with the merging unit and the intelligent terminal. The invention can accurately detect the time synchronization status of substation automation equipment, and form a closed-loop monitoring between the time synchronization equipment and the time synchronization equipment, instead of monitoring and correcting the time synchronization accuracy through other third-party equipment, it is realized by the time synchronization equipment The precision monitoring and correction of the time-adjusted equipment has simple structure, high reliability, high precision and convenient use.

Description

A Time Calibration Method for Substation Automation System Based on Synchronous Closed-loop Monitoring

technical field

The invention relates to the field of electrical technology, in particular to a time synchronization verification method for a substation automation system based on synchronous closed-loop monitoring.

Background technique

At present, the existing time synchronization online monitoring management principle of the substation adopts a layered management method. The station control layer host manages the time synchronization status of the bay layer equipment through the SNTP-based message protocol, and the bay layer measurement and control devices use the GOOSE-based message protocol. Manage process level devices.

However, this solution has serious drawbacks:

1. The low-precision background host acts as the arbiter. Generally speaking, the time accuracy of the background host is at the second level, which is one of the lowest accuracy types of devices in the entire substation secondary device. It is unreasonable to use the background host to arbitrate other high-precision devices.

2. There may be timing problems in the background itself. As the time-serving device, the background host itself has the possibility of abnormal synchronization. Since there is no device to monitor the synchronization status of the background host, there is uncertainty in the monitoring of the background host itself.

3. It cannot meet the monitoring requirements of microsecond-level timing equipment. The current time synchronization online monitoring method is a simple network monitoring method based on NTP and GOOSE, and the accuracy is only at the millisecond level, which cannot monitor microsecond-level timing devices such as PMUs and merging units.

Contents of the invention

In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a time calibration method for substation automation system based on synchronous closed-loop monitoring, so as to solve the deficiencies of the prior art.

In order to achieve the above object, the present invention provides a time calibration method for a substation automation system based on synchronous closed-loop monitoring, comprising the following steps:

Step 1: The time synchronization status monitoring module of the clock device is started, and the synchronization closed-loop time synchronization verification process is started;

Step 2: The connection time synchronization port of the clock device is partially activated, and the time synchronization port of the time service device is connected through optical fiber or other communication media;

Step 3: The time synchronization port of the time service device is partially activated, and the time synchronization port of the time synchronization device is connected through optical fiber or other communication media to form a time synchronization channel;

Step 4: The time synchronization information part of the clock device is started, and the time synchronization information is sent by the time synchronization message at a specified interval period;

Step 5: The time-serving device returns the time synchronization information part to start, and the time-service device returns the time synchronization status information to the clock device at a specified interval cycle;

Step 6: The calculation clock deviation part of the clock device is started, and the time synchronization device compares the time synchronization state information returned by the time synchronization device with the standard clock, and calculates the deviation value between the time of the secondary device and the standard time;

Step 7: The judgment abnormality and error part of the clock device is started, and the abnormal time synchronization status and time error of the time-serving device at the moment are judged according to the time synchronization accuracy judgment rule;

Step 8: The correction of the time synchronization error of the clock device is partially started, wherein the time synchronization device actively corrects the time error of the time synchronization device in the next time synchronization message according to the above time error;

Step 9: Start the part of sending time synchronization information of the clock device again, and continue to synchronize the time synchronization of the next channel of the closed loop.

In the above-mentioned substation automation system time synchronization verification method based on synchronous closed-loop monitoring, the clock device is the time synchronization information transmission source of the whole station, and sends its own time synchronization state information to the time service equipment of the whole station through the station control layer network, According to different devices, use NTP/IEC61850/IEC103/IEC104 and other communication protocols; all time-serving devices send their own time synchronization status information and device status self-inspection data to the clock device, using IEC104/DL476/IEC61850/original station control layer protocol.

In the above-mentioned substation automation system time-checking method based on synchronous closed-loop monitoring, the time-checking status information of the time-serviced equipment includes: time-checking signal status (normal, no signal, invalid quality bit, check error); Time service status (normal, device not timed); time jump detection status (normal, time jump detected); time status information of the timed device includes: antenna status (normal, antenna failure), satellite Receiver module status (normal, satellite receiver module communication status, self-test abnormality), time jump detection status (normal, time jump detected), time source selection (currently selected time source), crystal oscillator taming status (normal , crystal oscillator taming exception), initialization status (device power-on reset), power module status (normal, power module abnormal).

A substation automation system based on synchronous closed-loop monitoring, including a clock device and a timed device, the clock device and the timed device are connected through a station control layer network, the clock device includes a state monitoring module part, a connection timing port part, The time synchronization information part is sent, the time synchronization deviation value is calculated, the abnormality and error is judged, and the time synchronization error is corrected. wave device.

In the aforementioned substation automation system based on synchronous closed-loop monitoring, the monitoring background is connected to the control master station through the data communication gateway, and the measurement and control device is connected to the merging unit and the intelligent terminal.

In the aforementioned substation automation system based on synchronous closed-loop monitoring, the station control layer network is optical fiber or Ethernet.

The beneficial effects of the present invention are:

The invention can accurately detect the time synchronization status of substation automation equipment, and form a closed-loop monitoring between the time synchronization equipment and the time synchronization equipment, instead of monitoring and correcting the time synchronization accuracy through other third-party equipment, the time synchronization equipment realizes For the accuracy monitoring and correction of the time-aligned equipment, the invention has the advantages of simple structure, high reliability, high precision and convenient use.

The idea, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present invention.

Description of drawings

Fig. 1 is system structure and work flowchart of the present invention;

Fig. 2 is the application data flow chart of the present invention in typical substation;

Fig. 3 is a principle diagram of the time synchronization closed-loop verification of the present invention.

Detailed ways

A new time calibration system for substation automation equipment based on synchronous closed-loop monitoring consists of a clock device and a timed device. The clock device includes the state monitoring module part, the connection time synchronization port part, the time synchronization information transmission part, the time synchronization deviation value calculation part, the judgment abnormality and error part, and the time synchronization error correction part; the time service system includes the connection pair Time port part, return time synchronization state information part, etc. As shown in Figure 1.

The time synchronization management and verification module of the time synchronization equipment, as the time synchronization monitoring manager of the station control layer, realizes the time synchronization monitoring of typical equipment in the substation based on the SNTP ping-pong principle, such as measurement and control devices, fault recording devices, PMU devices, etc.; measurement and control As the time synchronization monitoring manager of the interval layer, the device realizes the time synchronization monitoring of the merging unit and intelligent terminal through GOOSE based on the SNTP ping-pong principle.

The working process of the new substation automation equipment time calibration system based on synchronous closed-loop monitoring is shown in Figure 1.

Step 1: The time synchronization status monitoring module of the clock device is started, and the synchronization closed-loop time synchronization verification process is started;

Step 2: The connection time synchronization port of the clock device is partially activated, and the time synchronization port of the time service device is connected through optical fiber or other communication media;

Step 3: The time synchronization port of the time service device is partially activated, and the time synchronization port of the time synchronization device is connected through optical fiber or other communication media to form a time synchronization channel;

Step 4: The time synchronization information part of the clock device is started, and the time synchronization information is sent by the time synchronization message at a specified interval period;

Step 5: The time-serving device returns the time synchronization information part to start, and the time-service device returns the time synchronization status information to the clock device at a specified interval cycle;

Step 6: The calculation clock deviation part of the clock device is started, and the time synchronization device compares the time synchronization state information returned by the time synchronization device with the standard clock, and calculates the deviation value between the time of the secondary device and the standard time;

Step 7: The judgment abnormality and error part of the clock device is started, and the abnormal time synchronization status and time error of the time-serving device at the moment are judged according to the time synchronization accuracy judgment rule;

Step 8: The correction of the time synchronization error of the clock device is partially started, wherein the time synchronization device actively corrects the time error of the time synchronization device in the next time synchronization message according to the above time error;

Step 9: Start the part of sending time synchronization information of the clock device again, and continue to synchronize the time synchronization of the next channel of the closed loop.

Timing-timed equipment in substations, including substation monitoring systems, intelligent components, fault recorders, PMUs, measurement and control devices, relay protection devices, safety and stability control devices, etc. A typical substation time synchronization system based on synchronous closed-loop monitoring and time calibration is shown in Figure 2. The time synchronization application data flow of all equipment in a typical substation is exemplified.

In accompanying drawing 2, the data source of online monitoring of time synchronization status is divided into two categories: time synchronization status measurement data and equipment status self-inspection data.

The time state measurement data is pointed by double arrows. All devices send their own time state data to the clock device and receive time state data from the clock device at the same time. The transmission medium is usually a station control layer network, a process layer network, a data gateway machine, etc. composed of Ethernet or optical fiber.

The device status self-inspection data information is pointed by a single arrow, and all timed devices send their own status self-inspection data information; the clock device receives this information and is analyzed and processed by its monitoring module;

Among them, the data communication gateway machine sends its own time state measurement data, equipment state self-inspection data, etc. to the control master station; the control master station sends time state measurement data to the data communication gateway machine;

Among them, the clock device sends the measurement data of time state information to all the time-serviced equipment in the substation, including station control layer equipment, monitoring background, PMU device, measurement and control device, protection equipment, fault recording device, etc.; the time-serviced device sends its own Time status measurement data, device status self-test data, etc. are sent to the clock device;

Among them, the measurement and control device sends the time state information measurement data to the merging unit and the intelligent terminal; the merging unit and the intelligent terminal send their own time state measurement data, equipment state self-inspection data, etc. to the measurement and control device;

The present invention uses the method of establishing virtual telemetry and virtual telemetry points for each state quantity to transmit shaping and Boolean variables, wherein the monitoring host is used as the time synchronization monitoring manager of the interval layer equipment, and the existing service interface can be used to realize the data Collect and store, and then add corresponding advanced applications to analyze the status data, and at the same time, the analysis results of data collection and store are forwarded to the control master station through the data communication gateway. For intelligent stations, virtual remotes generated by state information changes in the process layer are sent by GOOSE in the IEC61850 protocol. The measurement and control device is used as the time synchronization monitoring and management of the process layer equipment. The state information of the interval layer is sent by MMS, and the interval layer of the conventional station is sent by IEC104.

Table 1 exemplifies the time synchronization status information flow of all equipment in a typical substation shown in Figure 2, including the sender and receiver of the information flow, the communication protocol used, and the content of the information.

Table 1 Time synchronization state information flow table of the whole station

Among them, the clock device is the source of the time synchronization information of the whole station, and sends the time synchronization status measurement data of the device to the time service device of the whole station through the station control layer network. According to different devices, communication protocols such as NTP/IEC61850/IEC103/IEC104 can be used ;All time-serving devices send their own time-setting status measurement data and device status self-inspection data to the clock device, and can adopt IEC104/DL476/IEC61850/original station control layer protocol, etc.;

The basic principle of time synchronization closed-loop verification is shown in Figure 3.

Substation time synchronization monitoring uses SNTP as the basic monitoring method, and uses two layers of protection measures to avoid conflicts with time synchronization services.

The access control time synchronization server of the IP protocol only exists in the clock device, and the monitoring server exists in the monitored device. Therefore, after the IP address is correctly configured, the monitoring request will not be confused with the time synchronization request, ensuring that SNTP services for different purposes will not be confused. will conflict.

Access control of protocol identification: add the "TSSM" identification in the ReferenceIdentifier field of the SNTP message, and ensure that the monitoring server should not respond to request messages other than the "TSSM" identification, and the time synchronization server should not respond with the identification of "TSSM" request, thus ensuring that the two will not conflict under any circumstances.

The time synchronization monitoring SNTP protocol adopts the client/server mode, in which the time management verification module is the client, and the monitored device is the server. The time management verification module periodically sends messages to the monitored device, and the time management verification module calculates the clock deviation according to the clock message returned by the monitored device.

In the accompanying drawing 3, the time management verification module sends a "monitoring clock request" at T0 time; the monitored device receives the "monitoring clock request" message at T1 time, and returns the "monitoring clock request result" at T2 time; the time management calibration The verification module receives the "monitoring clock request result" message at time T3.

Let the round-trip delay of the NTP clock message packet on the network be α, the time deviation between the server and the time synchronization terminal be θ, where the path delay when the server sends the NTP clock message is α1, and the time synchronization terminal returns the NTP clock message When the path delay is α2, it can be obtained by calculation:

α1=T1-T0-θ;

α2=T3-T2+θ;

α=α1+α2;

Assuming that the network is an ideal network, then the delay in the network is equal, that is:

α1=α2=α/2;

Then through the above formula 4, it can be calculated:

θ=[(T1–T0)-(T3–T1)]/2;

Then the time error between the time management verification module and the monitored equipment:

Δt=α1=α2=[(T3-T2)+(T0-T1)]/2;

Wherein: T0 is the time scale when the management terminal sends "measurement clock request"; T1 is the time scale when the monitored end receives the "measurement clock request"; T2 is the time scale when the monitored end sends "the result of the measurement clock request"; T3 It is the time stamp when the management end receives the "result of measurement clock request".

Time Synchronization Monitoring The manager periodically sends the "measurement clock request" command to the managed. After completing a "measuring clock request" process, calculate the clock deviation △t between the manager and the managed person for time synchronization monitoring based on T0, T1, T2, and T3. Configurable. When the management terminal inquires that a monitoring value of a certain device exceeds the limit, it should continuously monitor 5 times at a period of 1 second each time, and remove the extreme value from the 5 results and average them. If the average value exceeds the limit, it is considered that the time synchronization of the monitored object is abnormal. An alarm is given and uploaded to the control master station.

Monitoring data:

The data for time synchronization status verification is divided into time synchronization status measurement data and device status self-test data. The time synchronization status is measured by the ping-pong method, which is the main monitoring data for time synchronization management verification. When the management terminal finds that the time synchronization of the monitored equipment is abnormal, the management terminal should generate an alarm message and send it through the alarm gateway or data communication gateway. Send it to the corresponding control center; the purpose of the equipment status self-inspection is mainly to quickly detect the failure point of the monitored equipment itself based on the strategy set by the foreseeable failure. The status information of the timed device and the clock device is as follows:

Timed device status information. Including time synchronization signal status (normal, no signal, invalid quality bit, check error, etc.); time synchronization service status (normal, equipment not timed, etc.); change, etc.); as shown in Table 2;

Table 2 Timed device status information

Timed device status information. Including antenna status (normal, antenna failure, etc.), satellite receiving module status (normal, satellite receiving module communication status, self-test abnormality, etc.), time jump detection status (normal, time jump detected, etc.), time source Selection (currently selected time source), crystal oscillator taming status (normal, crystal oscillator taming abnormal, etc.), initialization status (device power-on reset), power module status (normal, power module abnormal, etc.). as shown in Table 3

Table 3 Clock device status information

The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art shall be within the scope of protection defined by the claims.

Claims (6)

1. it is a kind of based on synchronous closed loop monitoring electric substation automation system pair when method of calibration, it is characterised in that including following Step：

Step 1：Clockwork pair when state monitoring module start, start checking process during synchronous closed loop pair；

Step 2：Port section starts during the connection pair of clockwork, by optical fiber or the connection of other communication medias by time service equipment Pair when port；

Step 3：By time service equipment connection pair when port section start, pass through optical fiber or other communication medias connection pair when equipment Pair when port, formed pair when passage；

Step 4：Message part starts during the transmission pair of clockwork, at a prescribed interval during cycle utilization pair during message transmission pair Information；

Step 5：By time service equipment return pair when message part start, by time service equipment at a prescribed interval the cycle using return Pair when status information to clockwork；

Step 6：The calculating clock skew component of clockwork starts, pair when equipment compare by pair when equipment return pair when state Information and standard time clock, calculate the time of secondary device and the deviation of standard time；

Step 7：The judgement exception and error component of clockwork start, according to pair when precision decision rule judge by time service equipment This moment pair when abnormal state and time error；

Step 8：During the correction pair of clockwork error component start, wherein, pair when equipment according to above-mentioned time error in next time Pair when message in carry out actively correct by pair when equipment time error；

Step 9：The message part during transmission pair of clockwork is again started up, when continuing under synchronous closed loop all the way pair.

2. method of calibration during a kind of electric substation automation system pair based on the monitoring of synchronous closed loop as claimed in claim 1, its It is characterised by：Information transmission source when the clockwork is whole station pair, sent by station level network to whole station by time service equipment Itself pair when status information, according to distinct device, using communications protocol such as NTP/IEC61850/IEC103/IEC104；It is all By time service equipment to clockwork send itself pair when status information and equipment state self-inspection data, using IEC104/ DL476/IEC61850/ original station level agreements.

3. method of calibration during a kind of electric substation automation system pair based on the monitoring of synchronous closed loop as claimed in claim 2, its Be characterised by, it is described by time service equipment pair when status information include：Pair when signal condition (normal, no signal, quality position nothing Effect, verification are wrong)；Pair when service state (normal, equipment not pair when)；Pair when saltus step detecting state (it is normal, detect time jump Become)；By time service equipment pair when status information include：Antenna condition (normal, antenna failure), satellite reception module status are (just Often, satellite reception module communication state, self-test are abnormal), time saltus step detecting state (normal, detect time saltus step), the time State (normal, crystal oscillator is tamed abnormal), init state (device power are tamed in source selection (time source currently selected), crystal oscillator Reset), power module state (normal, power module abnormal).

A kind of 4. electric substation automation system based on the monitoring of synchronous closed loop, it is characterised in that：Including clockwork and by time service Equipment, the clockwork by station level network connection, the clockwork by time service equipment with including state monitoring module Partly, port section during connection pair, message part when sending pair, deviation value part when calculating pair, judge exception and error component And correct pair when error component, it is described by time service equipment include station level equipment, monitoring backstage, PMU devices, measure and control device, Protection equipment, fault wave recording device.

A kind of 5. electric substation automation system based on the monitoring of synchronous closed loop as claimed in claim 4, it is characterised in that：It is described Monitoring backstage is shut down by data communication network connects regulation and control main website, the measure and control device connection combining unit, intelligent terminal.

A kind of 6. electric substation automation system based on the monitoring of synchronous closed loop as claimed in claim 4, it is characterised in that：It is described Station level network is optical fiber or Ethernet.