CN107566205B

CN107566205B - SV message-based merging unit synchronous measurement method

Info

Publication number: CN107566205B
Application number: CN201710547548.1A
Authority: CN
Inventors: 赵旋宇; 胡荣; 陶文伟; 高红亮; 付艳兰; 张喜铭; 李金�; 樊腾飞; 胡春潮; 何锡祺; 王恒; 陈�胜
Original assignee: China Southern Power Grid Co Ltd
Current assignee: China Southern Power Grid Co Ltd
Priority date: 2017-07-06
Filing date: 2017-07-06
Publication date: 2021-02-19
Anticipated expiration: 2037-07-06
Also published as: CN107566205A

Abstract

The invention relates to a merging unit synchronous measurement method based on SV messages. The merging unit synchronous monitoring system based on SV message comprises 4 modules, namely a merging unit output module, a message analysis module, a synchronous monitoring module and a synchronous detection result output module, and the synchronous measurement method of the merging unit synchronous monitoring system comprises the following steps: 1) the merging unit output module outputs SV messages with second pulses; 2) the message analysis module analyzes the pulse per second time of each merging unit; 3) the synchronous monitoring module calculates the pulse per second error; 4) and the synchronous detection result output module displays the pulse per second errors of all the merging units. The SV message-based merging unit synchronous measurement method provided by the invention obtains the synchronous state of the merging unit through calculation by means of the existing SV message and the existing SV physical optical fiber, does not additionally add a separate clock optical fiber, is simple and universal, and saves investment.

Description

SV message-based merging unit synchronous measurement method

Technical Field

The invention discloses a merging unit synchronous measurement method based on SV (space vector) messages, belonging to the innovative technology of the merging unit synchronous measurement method based on SV messages.

Background

The merging unit is process layer equipment in the intelligent substation and is responsible for collecting signals of a current transformer or a voltage transformer, carrying out interpolation synchronization on the signals, converting the signals into digital quantity and sending the digital quantity to protection or control equipment of a bay layer. The synchronization of the merging unit is crucial in the networking mode, and directly influences the action behavior of the protection. However, the synchronization of the merging unit is detected only by network access detection, the field is only the differential stream protected under verification, and a real-time verification mechanism for sampling synchronization of the merging unit is lacked.

At present, when the merging unit is out of step, sending the Sync bit identifier in the message only by the merging unit is unreliable, and a convenient monitoring means is lacked.

The merging unit specification Q/GDW11487-2015 analog input merging unit of intelligent substation and standard design specification of intelligent terminal requires that the merging unit should have pulse per second output. The pulse-per-second output of the merging unit is not typically monitored in the field, however, because the pulse-per-second output is a separate interface, a large number of optical fibers need to be deployed in the field.

Disclosure of Invention

The present invention is directed to provide a merging unit synchronization measurement method based on SV messages in consideration of the above problems. The invention obtains the synchronization state of the merging unit through calculation by means of the existing SV message and the existing SV physical optical fiber, does not additionally increase a separate clock optical fiber, is simple and universal, and saves investment.

The technical scheme of the invention is as follows: the invention relates to a merging unit synchronous measurement method based on SV messages, wherein a merging unit synchronous monitoring system based on SV messages comprises 4 modules which are a merging unit output module, a message analysis module, a synchronous monitoring module and a synchronous detection result output module respectively, and the synchronous measurement method of the merging unit synchronous monitoring system comprises the following steps:

1) the merging unit output module outputs SV message with pulse per second: a certain channel value in the SV message is used as the output time of the second pulse of the merging unit, and the output time is in unit of microseconds, and the time is the time of lagging the second pulse of the message;

2) the message analysis module analyzes the pulse per second time of each merging unit: analyzing the obtained SV message of each interval, and analyzing the numerical value of an analog quantity clock channel to further obtain the second pulse time of the merging unit;

3) the synchronous monitoring module calculates the pulse per second error: acquiring a standard clock source, analyzing a standard pulse-per-second time, receiving the pulse-per-second time analyzed in the step 2), judging the error of the two pulse-per-second times, and alarming when the time exceeds a threshold time;

4) and the synchronous detection result output module displays the pulse per second errors of all the merging units: and (3) displaying the pulse per second error time obtained in the step 3) in real time and displaying the pulse per second error time to operators.

The SV message-based merging unit synchronous measurement method provided by the invention comprises the steps of analyzing the analog quantity clock value of the merging unit, marking the arrival time of the message, calculating the pulse per second time of the merging unit, detecting the error between the pulse per second time of the merging unit and the pulse per second time of the marked clock source through a synchronous detection module, and further judging whether the merging unit is in a synchronous state. The invention has the beneficial effects that: by means of the existing SV message and the existing SV physical optical fiber, the synchronization state of the merging unit is obtained through calculation, a single clock optical fiber is not additionally added, the method is simple and universal, and investment is saved. The invention is a convenient and practical SV message-based merging unit synchronous measurement method.

Drawings

FIG. 1 is a schematic diagram of a SV message-based merging unit synchronous monitoring system according to the present invention;

FIG. 2 is a flow chart of the present invention.

Detailed Description

Example (b):

fig. 1 is a schematic diagram of a SV message-based merging unit synchronous monitoring system according to the present invention, which includes 4 modules, and the principle of the SV message-based merging unit synchronous monitoring method according to the present invention is further explained below based on these modules.

1) Merging unit output module

And the merging unit outputs an SV message, and a certain channel value in the SV message is used as the output time of the pulse per second of the merging unit in a unit of microsecond. This time is the time that the message lags behind the pulse of seconds.

For example, the merge unit outputs an SV packet with a sampling rate of 4KHz, and the SV packet with a sampling number of 0 indicates that the sampling time is the pulse-per-second rising edge time, at this time, because there is a delay in processing and transmitting data inside the apparatus, the time that the SV packet appears at the port is 800us (assumed), at this time, the analog quantity of the channel is 800us, and it represents that the frame data is 800us away from the pulse-per-second edge. And sampling the SV message with the serial number of 1, wherein the time from the second pulse is 1050us, and the value of the channel is 1050 us.

Under the networking condition of the intelligent substation, the synchronization performance of the merging units is related to the action of protection, and the merging units do not have synchronous detection at present. The merging unit itself has the output of the synchronisation port, which is typically the output of the PPS, using single mode fibre, requiring a large number of fibres to be deployed if monitored in the field. The invention adopts a certain channel of the SV message of the merging unit to represent the synchronization performance of the merging unit, and can use the prior SV network without additionally increasing hardware.

2) Message parsing module

The module is mainly responsible for analyzing the obtained SV messages of each interval and analyzing the numerical value of the analog quantity clock channel so as to obtain the time of the pulse per second of the merging unit.

The method comprises the following specific steps:

1) acquiring the receiving time T1 of the message;

2) analyzing the analog quantity channel value T2 in the message;

3) the pulse-per-second time T = T1-T2 is calculated.

The module marks the receiving time T1 of the SV message by using hardware, analyzes the analog quantity channel value T2 in the message and calculates the pulse-per-second time T = T1-T2.

If the message passes through the switch and the switch supports a delay measurable function (the delay measurable function refers to the residence time of the switch in the switch of the SV message, which is filled in the reserved field of the message), the residence time of the message is T3, and the pulse-per-second time T = T1-T2-T3 is calculated.

3) Synchronous monitoring module

The module is connected with a standard clock source and analyzes the pulse per second time. And simultaneously, receiving the pulse per second output by the message analysis module. The synchronous monitoring module is responsible for judging the error of the two pulse per second time and alarming when the error exceeds a threshold (generally taking 4 us).

4) Synchronous detection result output module

The module is responsible for clearly displaying the abnormal alarm result obtained by the synchronous monitoring algorithm to the operator, so that the operator can pay attention to the synchronous state of the abnormal merging unit in a targeted manner and find out the synchronous abnormality of the merging unit in time, thereby improving the reliability of the system.

In this embodiment, the merging unit uses the output fiber dedicated to PPS to perform the pulse per second test, but a large number of fibers need to be pulled.

The working principle of the invention is as follows:

1) the merging unit outputs SV message with pulse per second: and a certain channel value in the SV message is used as the output time of the second pulse of the merging unit in a unit of microsecond. This time is the time that the message lags behind the pulse of seconds.

2) Analyzing pulse per second time of each merging unit: and analyzing the obtained SV message of each interval, and analyzing the numerical value of the analog quantity clock channel to further obtain the time of the pulse per second of the merging unit.

3) Calculating the pulse per second error: and (3) acquiring a standard clock source, analyzing the standard pulse-per-second time, receiving the pulse-per-second time analyzed in the step 2), judging the error of the two pulse-per-second times, and alarming when the error exceeds a threshold (generally 4 us).

4) Second pulse error of all merging cells is displayed: and (3) displaying the pulse per second error time obtained in the step 3) in real time and displaying the pulse per second error time to operators.

The SV message-based merging unit synchronous measurement method provided by the invention is simple and universal, does not additionally increase a separate clock fiber, and saves investment.

Claims

1. A merging unit synchronous measurement method based on SV message, merging unit synchronous monitoring system based on SV message includes 4 modules, it is merging unit output module, message analysis module, synchronous monitoring module, synchronous detection result output module separately, characterized by that the synchronous measurement method of the merging unit synchronous monitoring system includes the following steps:

1) the merging unit output module outputs SV message with pulse per second: a certain channel value in the SV message is used as the output time of the second pulse of the merging unit, and the unit microsecond is the time difference of the time lagging the second pulse time of the SV message in the frame;

2) the message analysis module analyzes the pulse per second time of each merging unit: analyzing the obtained SV message of each interval, and analyzing the numerical value of an analog quantity clock channel to further obtain the pulse per second time of each merging unit; the method comprises the following specific steps:

21) acquiring the receiving time T1 of the message;

22) analyzing the analog quantity channel value T2 in the message;

23) calculating the pulse per second time T-T1-T2;

if the message passes through the switch and the switch supports a delay measurable function, the delay measurable function means that the switch fills the residence time of the SV message in the switch in a reserved field of the message, the residence time of the message is recorded as T3, and the pulse per second time T is calculated as T1-T2-T3;

3) the synchronous monitoring module calculates the pulse per second error: acquiring a standard clock source, analyzing a standard pulse-per-second time, receiving the pulse-per-second time analyzed in the step 2), judging the error of the two pulse-per-second times, and alarming if the time exceeds a threshold time;

4) and the synchronous detection result output module displays the pulse per second errors of all the merging units: displaying the error of the pulse per second time obtained in the step 3) in real time, and displaying the error to an operator;

one channel in the merging unit SV message is any one channel in the SV message;

2. the SV message-based merge-unit synchronous measurement method according to claim 1, wherein the threshold time in the step 3) is 4 us.