CN109343333A

CN109343333A - A method and system for time synchronization of power distribution terminals using voltage and power frequency signals

Info

Publication number: CN109343333A
Application number: CN201811509927.2A
Authority: CN
Inventors: 韩国政; 李镇宇; 剧晶晶
Original assignee: Qilu University of Technology
Current assignee: Qilu University of Technology
Priority date: 2018-12-11
Filing date: 2018-12-11
Publication date: 2019-02-15

Abstract

A method of utilizing clock synchronization precision between the distribution terminal that voltage power frequency (50Hz) signal phase angle improves same distribution line or is connected on the different distribution lines on same substation bus bar, using the phase angle of voltage power frequency component as the reference quantity of clock synchronization, it is characterized by: being connected to same separate (such as A phase of all distribution terminal acquisitions on the distribution line of same substation bus bar, B phase, C phase, AB line, BC line, CA line, zero sequence etc.) voltage power frequency component phase angle it is identical, correction time error at the time of being in 0 ° simultaneously using the voltage power frequency component phase angle with separate (such as AB line), realize that clock is synchronous.By means of the invention it is possible to improve the precision of clock synchronization between different distribution terminals on same distribution line.

Description

A kind of distribution terminal time synchronization method and system using voltage power frequency component

Technical field

It is a kind of using the phase angle of voltage power frequency (50Hz) signal as reference, be connected to the same bus of same substation The method and system that clock is consistent between distribution terminal on all distribution lines, belongs to power system automatic field. Suitable for the distribution terminal on the different distribution lines on all distribution terminals or same bus on same distribution line Between the retention time it is synchronous.

Background technique

Feeder automation is the important component of power distribution automation, using being mounted on distribution line (also referred to as feeder line) Distribution power automation terminal (abbreviation distribution terminal, FTU), monitor the operation conditions of distribution line, find line fault in time, every From failure, and carry out service restoration.Its basic principle are as follows: the distribution network line of ring network structure open loop operation is passed through into block switch It is divided into multiple power supply sections, when some section breaks down, in time by block switch tripping, isolated fault section then leads to Closure interconnection switch is crossed, non-faulting section is restored electricity rapidly, so as to avoid the continuous power loss of whole route, reduces power failure Range shortens power off time, improves power supply reliability.In order to realize feeder automation, the block switch on feeder line is needed Place's installation Distributing Terminal Assembly, monitors electric current, the voltage condition of feeder line, and realizes the long-range control of separating brake combined floodgate to block switch System.The clock needs of different distribution terminals are consistent, consequently facilitating the operating condition of whole distribution line is understood, for distribution Breakdown judge, isolation and the service restoration of route have important influence.

In order to keep distribution terminal time consistency, it is common practice to GPS is installed in substation or when Beidou Clock provides the time signal of standard, is responsible for the time synchronization of terminal on distribution line by substation's distribution terminal, by the standard time The other distribution terminals being sent on distribution line, distribution terminal on distribution line is according to the standard time received to local Time is adjusted.Common time synchronization method includes the time synchronization method of IEC 60870-5-101/104, Simple Network Time Protocol 1588 clock synchronization agreement of SNTP, IEEE etc..Distribution terminal is wherein carried out using the clock synchronization order of IEC 60870-5-101/104 Clock synchronization, the delay of network are difficult to calculate, and clock synchronization application condition is big, usually between 10ms~50ms.SNTP agreement using client/ Server working method, server pass through regular visit service by receiving time reference of the GPS signal as system, client computer The Time Service that device provides obtains correct time information, and adjusts the system clock of oneself, reaches the mesh of network time synchronization 's.In the network environment of feeder automation, the clock synchronization error of SNTP is generally less than 10ms.IEEE 1588 is then further utilized The agreement of communication network bottom is to reduce the error of clock synchronization.SNTP agreement and IEEE 1588 assume to transmit in setting network Path be it is symmetrical, i.e., message is as master clock to the time used in the clock and message as the time used in from clock to master clock It is identical, postponed by continuous corrective network and clock jitter, to realize that clock is synchronous.

Summary of the invention

Goal of the invention

The purpose of the present invention is to propose to the time synchronization methods of improved SNTP a kind of, using distribution line with separate voltage phase This identical feature of angle, as the reference quantity of distribution terminal time adjustment, to improve the essence of distribution terminal clock clock synchronization It spends, clock synchronization error is reduced to 1ms by 10ms between realization distribution terminal.

The purpose of the present invention can be achieved through the following technical solutions

A kind of distribution terminal time synchronization method using voltage power frequency component, realization system include on same substation bus bar Distribution terminal (FTU) and communication system on all distribution lines, as shown in Figure 1.Distribution terminal carries out letter by communication system Breath exchange.

The distribution terminal (FTU) includes at block switch on the FTU and distribution line at substation bus bar FTU.FTU monitoring and acquisition feeder line operation electric current, information of voltage, switch division information, according to acquisition feeder line information into The judgement of row feeder fault.FTU sends or receives clock synchronization information simultaneously, is adjusted to the clock of the local FTU.

Communication of the communication system between each distribution terminal FTU provides channel.

FTU0 is the distribution terminal of monitoring substation busbar voltage, is mounted on substation, the GPS company of FTU0 and substation It connects, the standard clock source as FTU other on distribution line.FTU11, FTU12, FTU13 are to be mounted on 1 (feeder line of distribution line 1) distribution terminal at block switch, FTU21, FTU22, FTU23 are to be mounted on block switch on distribution line 2 (feeder line 2) The distribution terminal at place, FTU11, FTU12, FTU13, FTU21, FTU22, FTU23 keep clock consistent with FTU0.

FTU0, FTU11, FTU12, FTU13, FTU21, FTU22, FTU23 etc. select to monitor ac voltage signal phase Position sends command message at the time of being 0 °.

The process of whole system clock synchronization is as shown in Figure 2:

FTU0 T0, upper all on same distribution line at the time of monitoring that voltage power frequency component phase angle is 0 ° match Electric terminals (FTU11, FTU12, FTU13, FTU21, FTU22, FTU23) send broadcast message, inform that FTU0 is the mark of one's respective area Quasi- clock source, distribution terminal FTU11, FTU12, FTU13, FTU21, FTU22, FTU23 on route are using FTU0 as standard time clock Carry out time synchronization；

FTU11 detects T1 at the time of AB line voltage power frequency component phase is 0 °, sends clock synchronization request command to FTU0；

FTU0 receives the clock synchronization request of FTU11 at the T2 moment, and FTU0 detects that AB line voltage phase angle is before the T2 moment 0 ° of nearest moment T3；

FTU0 detects T4 at the time of AB line voltage power frequency component phase angle is 0 °, sends clock synchronization request command to FTU11；

FTU11 receives the clock synchronization feedback signal of FTU0 at the T5 moment, and FTU11 detects voltage signal phase before the T5 moment The nearest moment T6 that angle is 0 °；

The propagation time between FTU0 to FTU11 is corrected,

If | (T2-T3)-(T5-T6) | < 10ms is not necessarily to correction,

If | (T2-T3)-(T5-T6) | >=10ms, if (T2-T3) > 10, T6=T6-20ms

(if T5-T6) > 10, T3=T3-20ms

Calculate the time deviation Toffset of FTU11

T_offset=[(T6-T4)+(T1-T3)]/2

FTU11 carries out time adjustment

T=T-Toffset

The same FTU11 of clock synchronization process of FTU21, step are identical as (2)~(9).

Detailed description of the invention

Fig. 1 is the structure chart of feed line automatization system

Fig. 2 is distribution terminal clock synchronization communication process figure

Specific embodiment

Specific embodiments of the present invention as shown in Fig. 2, but not limited to this example.

FTU0 is located at substation bus bar, and substation GPS provides standard time clock for FTU0.FTU0 is as on feeder line The standard time clock of FTU11, FTU21 etc..FTU11 is the FTU on 1 route of feeder line at block switch, and FTU11 needs to keep with FTU0 Clock is consistent.

FTU0, FTU11 etc. have the function of voltage on detection feeder line.

FTU0, FTU11 etc. are connected by communication network.

Claims

1. a power distribution terminal time synchronization method utilizing voltage power frequency signal is characterized in that, with the power distribution terminal at the substation busbar as a standard clock source, the in-phase difference detected by different power distribution terminals on the outgoing line of the substation busbar at the same time is utilized. (such as A-phase, B-phase, C-phase, AB line, BC line, CA line, zero sequence, etc.) the phase angle of the voltage power frequency signal is the same, when the same phase (such as AB line) voltage power frequency is detected The signal phase angle is at 0° for time synchronization to improve the time synchronization accuracy.

2. according to claim 1, it is characterized in that, the power frequency signal phase angle of the voltage power frequency signal that is located in the standard clock source power distribution terminal of the substation and the segment switch on the distribution line is selected as the in-phase (such as AB line). The reference quantity sent by the time synchronization command.

3 . The method according to claim 1 , wherein the voltage power frequency signal is at a fixed phase angle (eg 0°) when the standard clock source power distribution terminal sends the time synchronization command and responds to the time synchronization command. 4 .

4 . The method according to claim 1 , wherein the power frequency signal of the voltage and power frequency is at a fixed phase angle (eg 0°) when the power distribution terminal at the segment switch on the distribution line performs time inquiry and response. 5 .

5. According to claims 1, 2, 3, and 4, the power distribution terminal sends a timing command when the voltage power frequency signal is at a fixed phase angle.