CN113141228A - Distribution room clock management solution based on transmission delay self-correction - Google Patents
Distribution room clock management solution based on transmission delay self-correction Download PDFInfo
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- CN113141228A CN113141228A CN202110406004.XA CN202110406004A CN113141228A CN 113141228 A CN113141228 A CN 113141228A CN 202110406004 A CN202110406004 A CN 202110406004A CN 113141228 A CN113141228 A CN 113141228A
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- H—ELECTRICITY
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
本发明公开了一种基于传输延时自校正的台区时钟治理解决方案，针对目前用电信息采集系统中信道类型多种多样，无法通过单一算法得到不同信道数据传输时间的问题，提出了一种基于归一化非完全Bate曲线的信道传输延时特征模型，该模型根据不同信道不同时间点的通讯传输耗时情况，经过不断学习和优化模型参数，使其能够精确计算出某一信道在某个时间点数据传输时间大小。其特征在于，利用了台区计量装置之间已存在的通信任务进行传输时间获取，无需额外添加任务，并设计了合理目标函数，使模型参数值得到不断的学习和优化，提高模型可靠性。根据模型得到的通信传输时间，对校时时间进行一定的补偿，从而实现台区内计量装置的时钟精准治理。
The invention discloses a station area clock management solution based on transmission delay self-correction. Aiming at the problem that there are various channel types in the current electricity consumption information acquisition system, and the data transmission time of different channels cannot be obtained through a single algorithm, a method is proposed. A channel transmission delay characteristic model based on the normalized incomplete Bate curve. According to the time-consuming situation of communication transmission in different channels at different time points, the model can accurately calculate the time of a certain channel through continuous learning and optimization of model parameters. The size of the data transfer time at a certain point in time. It is characterized in that the transmission time is obtained by using the existing communication tasks between the metering devices in the station area, no additional tasks are required, and a reasonable objective function is designed, so that the model parameter values can be continuously learned and optimized, and the reliability of the model is improved. According to the communication transmission time obtained by the model, a certain compensation is made for the time correction time, so as to realize the precise management of the clock of the metering device in the station area.
Description
Technical Field
The invention relates to the field of distribution automation systems, in particular to a distribution area clock management solution based on transmission delay self-correction.
Background
Along with the continuous development of intelligent power utilization and remote centralized meter reading technologies, the construction scale of an intelligent transformer area is continuously enlarged, remote meter reading full coverage is realized in some areas, but in the construction process, a plurality of problems also occur, the clock problem of a metering device is particularly obvious, in some areas, the proportion of the metering device with a clock error can even reach more than 10%, the data accuracy of the metering device is directly influenced by the clock error, and a plurality of negative influences are indirectly brought to the calculation of line loss.
At present, most of the methods of broadcast timing and point-to-point timing are combined to control clocks of metering devices in a distribution room, but the clock control method causes the clocks corrected by the metering devices to have deviation due to the fact that data transmission time cannot be accurately acquired, communication channels in the distribution room are various, a unified delay time calculation model is lacked, and equipment burden is increased through classification statistics.
Disclosure of Invention
Aiming at the problems, the invention discloses a characteristic model capable of accurately calculating the communication delay between devices, and a metering device in a distribution room can obtain the communication delay between different devices at different time points by utilizing data interaction or link confirmation between the metering device and other devices, so as to establish the communication delay characteristic model. Delay time compensation is carried out through the model in the clock correction execution process, and the accuracy of the clock of the metering equipment is improved. And the accurate calculation of the channel transmission delay is realized without additionally increasing communication tasks.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
step one, acquiring communication transmission time between devices at any time point of a certain channel in a distribution area;
calculating a group of standard deviations of transmission time, and primarily screening data;
step three, establishing a model curve, and designing a target function according to the model curve;
step four, optimizing the model parameters and the transformation coefficients according to the objective function, and obtaining optimized model parameter values through certain exercise;
and fifthly, after the specific parameter value is obtained, the channel data transmission time characteristic model is obtained, and the clock correction can be carried out at any time point.
Further, the communication transmission time in the step one may be obtained through daily data interaction between the station areas and channels such as link confirmation.
Further, the communication between the station area devices in the step one does not depend on the channel type, and may be any mode such as power line carrier, RS485, 4G, micro-power wireless, and the like, as long as the devices can communicate normally.
Furthermore, the transmission time is primarily screened in the step two, and the principle of normal distribution 3 sigma is utilized, so that the communication failure statistics error time can be avoided, and the accuracy of data is ensured.
Further, the characteristic model parameter objective function designed in the fourth step can obtain a target value according to the data transmission time obtained in a period of time, and further adjust the model parameters, so that the accuracy of the transmission time obtained by the characteristic model is improved.
Furthermore, after the data transmission time model is determined in the fifth step, corresponding clock compensation can be performed on the time synchronization command initiated by the master station when the time synchronization command is transmitted through different channel types, so that the accurate management of the station area clock is realized.
The method is based on the normalized incomplete Beta curve, and an accurate transmission time characteristic model is obtained through the acquisition of data transmission time and a specific objective function. The method comprises the steps of firstly, acquiring data transmission delay time of any time period of a channel by daily data interaction among equipment in a transformer area, then processing the delay time according to a target function, and finally identifying a curve parameter value. The invention uses the existing data interaction in the platform area, does not need to add extra tasks, can dynamically adjust the model parameters according to the latest data transmission condition, and accurately calculates the data transmission delay of any time of a certain channel.
Drawings
Fig. 1 is a schematic diagram of various channel types of an intelligent cell to which the present invention is applicable.
FIG. 2 is a flowchart of an implementation of the data transmission time characteristic model based on the Beta curve according to the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and the following description is only for clearly illustrating the technical solutions of the present invention, and the protection scope of the present invention is not limited thereby.
Step one, recording communication time and obtaining time delta t consumed by current communication transmission during each data interaction, and obtaining data transmission time delta t of a certain channel at a plurality of time points1、Δt2、…ΔtnAnd calculating the standard deviation value sigma of the group of data, and removing unreasonable communication delay time by using a 3 sigma standard to obtain data transmission time at different time points.
And step two, analyzing and processing the delay data by the optimization method of the normalized incomplete Beta curve to obtain a characteristic model of the delay time. The normalized incomplete Beta transform curve is as follows:
in the formula: x is the communication delay time at a certain time obtained after normalization, and the function B (α, β) is given by:
wherein, alpha is more than 0, beta is less than 10, the transmission time delay obtained for different parameters (alpha, beta) is different in accuracy, and even under a fixed transmission channel, the transmission time of data is fluctuated, so that an objective function capable of accurately reflecting the stability of the time delay time must be designed to obtain the optimal parameters alpha and beta, and the accuracy of the established characteristic model is ensured.
Step three, establishing an objective function for measuring the transmission delay fluctuation condition:
Fitness＝Hist/var (3)
in the formula:
wherein, t1For the start time of this communication, t2The next communication start time is N, the number of communications. In addition to this, the present invention is,
from the above equation, it can be seen that Hist is the overall coverage of the transmission time in a fixed period, and can reflect the fluctuation of the delay time, and var is the variance of a group of transmission times.
And step four, after the objective function is determined, exchanging data of any time point between the station area devices in the step one into the objective function to obtain a calculated value, and obtaining specific alpha and beta values through a communication condition of a period of time so as to obtain an accurate data transmission time model of a certain channel.
The invention obtains the data transmission time models of different channels and different time points in the distribution area by utilizing the daily data interaction of the distribution area, and accurately calculates the data transmission delay time of the channels at different time points in time by establishing the objective function and continuously adjusting the model parameters and the transformation coefficients, thereby realizing the accurate control of the clock of the metering equipment in the distribution area.
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|---|---|---|---|---|
| CN102306954A (en) * | 2011-07-13 | 2012-01-04 | 广东电网公司电力科学研究院 | Intelligent power consumption information interactive management system |
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- 2021-04-15 CN CN202110406004.XA patent/CN113141228B/en active Active
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Address after: No. 858, Huaguan Road, high tech Zone, Qingdao, Shandong Province 266000 Patentee after: QINGDAO TOPSCOMM COMMUNICATION Co.,Ltd. Country or region after: China Patentee after: Qingdao Zhidian New Energy Technology Co.,Ltd. Patentee after: QINGDAO DINGJUN ELECTRIC Co.,Ltd. Address before: No. 858, Huaguan Road, high tech Zone, Qingdao, Shandong Province 266000 Patentee before: QINGDAO TOPSCOMM COMMUNICATION Co.,Ltd. Country or region before: China Patentee before: QINGDAO DINGJUN ELECTRIC Co.,Ltd. |
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Address after: No. 858, Huaguan Road, high tech Zone, Qingdao, Shandong Province 266000 Patentee after: QINGDAO TOPSCOMM COMMUNICATION Co.,Ltd. Country or region after: China Patentee after: Qingdao Zhidian New Energy Technology Co.,Ltd. Patentee after: Qingdao Tuowei Technology Co.,Ltd. Address before: No. 858, Huaguan Road, high tech Zone, Qingdao, Shandong Province 266000 Patentee before: QINGDAO TOPSCOMM COMMUNICATION Co.,Ltd. Country or region before: China Patentee before: Qingdao Zhidian New Energy Technology Co.,Ltd. Patentee before: QINGDAO DINGJUN ELECTRIC Co.,Ltd. |
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