• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a method for the synchronized detection of measurement data required for controlling differential protection devices of electrical power lines (1), which are transmitted in packets via packet-switching networks (7) between two network elements (2, 3) whose clocks are measured by means of measured Transmit and receive times (Ts, Te) are synchronized to a predetermined number of Syn-chronisiernachrichten transmitted between the network elements (2, 3) via the packet-switching network (7) in cyclically repeating time intervals (TN), where the transmission and reception times (Ts, Te) are calculated, the run times of the individual synchronization messages and according to a predetermined, characteristic of the transmission line, statistical distribution of the terms are ordered, and where derived from the ordered maturity distribution of time required for clock synchronization parameter values calculated n. What is new is that the synchronization messages are transmitted from the network element (2) with the time-determining clock to the network element (3) with the clock to be synchronized and that from the transmission and reception times (Ts, Te) of the network element (3) with the synchronizing messages to be synchronized clock the times of each synchronization messages are calculated.
    公开号:AT518674A1
    申请号:T50515/2016
    申请日:2016-06-06
    公开日:2017-12-15
    发明作者:Aichhorn Andreas；Etzlinger Bernhard
    申请人:Sprecher Automation Gmbh；
    IPC主号:
    专利说明:

    The invention relates to a method for the synchronized detection of measurement data required for controlling differential protection devices of electrical power lines, which are transmitted in packets via packet-switched networks between two network elements whose clocks are transmitted based on measured transmission and reception times of between the network elements via the packet-switched network Sync messages are synchronized.
    In order to be able to evaluate the measured data recorded at the ends of the power line in the case of differential protective devices for electrical power lines, it is necessary to compare only measured data acquired at the same time with one another. This means that the measuring points must be assigned clocks to be synchronized, which leads in particular to difficulties when the data transmission takes place via packet-switched networks, because the transit time in such packet-switching networks depends on different, for example, the number and type of network nodes, the respective packet traffic and the priority of the data packets to be transmitted parameters is determined. To counter these difficulties, it is known (WO 2013/107896 A1) to provide the measurement data packet in the transmitting network element with a time stamp and to determine the transit time from the reception time of the receiving network element and the transmitted with the measurement data packet transmission time, so by the receiving Network element, the respective term for the determination of the measured data to be compared can be considered. A prerequisite for this, however, is a synchronization of the clocks belonging to the two power supplies, which is accomplished by a time clock predetermined network clock in a known per se via a precise time protocol (PTP) by the time-setting clock with a timestamped synchronizing messages are sent to whom is assigned by the synchronizing clocks of the receiving network elements, the respective reception time. The network elements with the clocks to be synchronized then send a delay request to the network element with the time-setting clock, which returns the reception time of this delay request, so that an existing difference between the transmission request and the reception time of the synchronization message and the transmission and reception time of the delay request Times of the time predetermining clock and the times of the clocks to be synchronized can be determined, but only under the condition of a sufficiently symmetrical transmission network. In addition, the network nodes involved must be equipped accordingly for carrying out this synchronization method.
    The invention is therefore based on the object, a method for synchronizing the clocks of two used to control a differential protection device electrical power lines network elements of a packet-switching network with multiple nodes in such a way that a sufficient differential protection clock synchronization can be ensured.
    Based on a method of the type described, the invention solves the problem by the fact that in cyclically repeating time intervals a predetermined number of synchronization messages is transmitted from the network element with the time-determining clock to the network element with the clock to be synchronized that from the transmission and Receive times the terms of the individual synchronization messages are calculated that the maturities are arranged according to a predetermined characteristic for the transmission line, statistical delay distribution and that derived from the ordered maturity distribution of time required for clock synchronization parameter values are calculated.
    The invention is based on the recognition that the transit time differences caused by the packet-switching network have a characteristic statistical distribution, usually an exponential distribution, characteristic of the respective transmission path, so that the differences between the transit time distribution derived from the transmission and reception times according to statistical methods and the predetermined, related to the transmission delay distribution can be deduced the difference of the time displays of the clocks to be synchronized. The prerequisite is, however, that the time during the observation period is not adjusted and the clocks to be synchronized have a constant path difference, which can be assumed at shorter time intervals.
    To determine the transit time of the synchronizing messages transmitted in a time interval from the network element with the clock which predetermines the time and received by the network with the clock to be synchronized, the difference between the reception and transmission times is formed in each case. These derived from the reception and transmission times runtimes include not only caused by the packet-switching network runtime fluctuations, but also the time and path differences of the two clocks to be synchronized. Since a distribution of the propagation time fluctuations characteristic of the transmission path can be specified, the transit times determined from the reception and transmission times can be arranged on the basis of the statistical propagation time distribution of the transmission path, in order to be able to derive a statistical propagation time distribution from the ordered transit times, which inferences allows the time and path difference of the clocks to be synchronized, so that the clock parameters required for clock synchronization can be derived with statistical methods from the measured delay distribution.
    If a symmetrical network, ie the same transmission conditions in the opposite direction, is assumed, then it is only necessary to transmit the synchronization messages in one direction. Does not meet this condition and is with a data exchange between the two
    To calculate network elements in both directions, so the different, dependent on the direction of travel time distributions for the transmission line to be considered, which can be achieved in an advantageous manner that between the network elements with the clocks to be synchronized within the cyclically repeating periods of both network elements Synchronization messages are sent, received and evaluated accordingly.
    Reference to the drawing, the inventive method is explained in detail. Show it
    Fig. 1 is a schematic block diagram of a differential protection device of an electrical power line and
    Fig. 2 is a diagram which sets the time ts of the time-determining clock with the time te of the clock to be synchronized.
    The differential protection device for an electrical power line 1 comprises two network elements 2, 3, in which the control of the provided for the separation of the power line 1 from the rest of the power network 4 circuit breaker 5, the evaluation of the required for the monitoring of the power line 1, measured by measuring devices 6 measured data, the transmitters and receivers for transmitting the measurement data combined into packets and the clocks for determining the measurement, transmission and reception times are summarized. The data transmission takes place via a packet-switching network 7. If the clocks of the two network elements 2, 3 are synchronized, the transit time of the measurement data packets is irrelevant, because by marking the measurement data packets with the transmission time stamp by the clock of the respectively transmitting network element 2 or 3 transmitted measurement data temporally the measurement data on the side of the receiving network element 3 or 2 can be assigned to turn off the power line 1 by pressing the circuit breaker 5 from the power grid 4 at predetermined deviations.
    Therefore, a sufficient synchronization of the two clocks of the network elements 2, 3 is essential. For this purpose, the clock of one of the two network elements 2, 3 predetermines the time which is synchronized with respect to the clock of the respective other network element. In the case of the embodiment according to FIG. 1, it is assumed that the clock of the network element 2 prescribes the time to be synchronized with the clock of the network element 3. Accordingly, the network element 2 transmits synchronization messages with the associated transmission times via the packet-switching network 7 to the network element 3, specifically in a predetermined number in each of the successive time intervals.
    In FIG. 2, such a time interval TN is indicated along the abscissa, on which the transmission time Tsi for the first of the synchronization messages of the network element 2 and the transmission time Tsi for the ith synchronization message are entered. While the clock of the network element 2 indicates a time Ts0 at the beginning of the time interval Tn, a time Te0 which differs by the amount u is indicated on the clock of the network element 3 to be synchronized. In addition, the clock of the network element 3 relative to the clock of the network element 2 has a path difference, which is indicated by a slope s of the clock of the clock of the network element 3 reproducing straight line 8. In order to synchronize the clocks of the two network elements 2, 3, clock parameters must be determined which on the one hand take into account the amount u of the different time displays and, on the other hand, the slope s of the path difference.
    For this purpose, within the time interval TN, a predetermined number of synchronization messages are transmitted via the packet-switching network 7 from the network element 2 to the network element 3. Of these synchronizing messages, the first and the i-th are indicated by the vectors vi and v. The synchronizing message sent at the time Ts0 is received at the time Tei of the clock of the network element 3. The transit time is composed of a predetermined by the transmission line constant amount a without delay and a delay time xi, which depends on the respective transmission conditions in the packet-switching network 7 and therefore subject to fluctuations, however, have a characteristic of the transmission line, static distribution. The synchronization message sent at time TSi has a
    Running time a + x, which leads to a reception time Tej. This means that the times Tei and Tei can be specified as follows:
    Tei = Ts0 + u + s (a + Xi) and Tei = Ts0 + u + s (TSi - Ts0 + a + x,)
    Since the propagation time fluctuations x are subject to a statistical distribution which depends on the transmission path and thus the propagation times determined from the reception and transmission times likewise have fluctuations which depend on this distribution, statistical methods can be used for determining the propagation distance, with characteristic variations in the propagation time s defined path difference and the amount u for the display difference at time Tso be inferred with the effect that watches clock synchronization parameters can be provided, which allows a higher accuracy of synchronization with less effort due to the reference to a given statistical distribution without having to provide corrective clocks in the nodes of the packet-switching network 7. In a steady state of the clocks, the transmission quality can also be assessed by means of the method according to the invention.
    权利要求:
    Claims (3)
    [1]
    1. Method for the synchronized detection of measurement data required for controlling differential protection devices of electrical power lines (1), which are transmitted in packets via packet-switched networks (7) between two network elements (2, 3) whose clocks are measured by measured transmission and reception times (Ts , Te) are synchronized by synchronizing messages transmitted between the network elements (2, 3) via the packet-switching network (7), characterized in that in cyclically repeating time intervals (TN) a predetermined number of synchronizing messages from the network element (2) with the time-determining clock is transmitted to the network element (3) with the clock to be synchronized, that from the transmission and reception times (Ts, Te) the terms of the individual synchronization messages are calculated that the maturities corresponding to a predetermined, characteristic of the transmission line, statistical distribution of maturities ge and that the runtime distribution derived from the ordered runtimes calculates the parameter values required for clock synchronization.
    [2]
    2. The method according to claim 1, characterized in that between the network elements (2, 3) with the clocks to be synchronized within the cyclically repeating time intervals (TN) of both network elements (2,
    [3]
    3) Synchronization messages are sent and received.
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    同族专利:
    公开号 | 公开日
    EP3255820A1|2017-12-13|
    AT518674B1|2018-02-15|
    引用文献:
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    WO2005002100A1|2003-06-30|2005-01-06|Koninklijke Philips Electronics N.V.|High accuracy network clock synchronization|
    WO2010045961A1|2008-10-24|2010-04-29|Telefonaktiebolaget Lm Ericsson |Method and device for packet network synchronization|
    EP2618502A1|2012-01-19|2013-07-24|ABB Technology AG|Data transmission over packet switched network|
    CN104584467B|2012-05-09|2018-04-27|马维尔以色列有限公司|It is synchronous using the clock of multiple network paths|CN109494694B|2018-11-23|2020-04-14|上海思源弘瑞自动化有限公司|Data synchronization method, device, equipment and medium for line differential protection|
    CN109873693A|2019-02-12|2019-06-11|广东电网有限责任公司|A kind of substation's clock synchronization situation cognitive method|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50515/2016A|AT518674B1|2016-06-06|2016-06-06|Method for the synchronized detection of measured data required for controlling differential protective devices of electrical power lines|ATA50515/2016A| AT518674B1|2016-06-06|2016-06-06|Method for the synchronized detection of measured data required for controlling differential protective devices of electrical power lines|
    EP17174205.9A| EP3255820A1|2016-06-06|2017-06-02|Method for synchronized capture of measurement data required for controlling differential protection devices of electrical power lines|
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