CN117318871B - Time protection method, equipment and medium for power monitoring system - Google Patents
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Abstract
The invention discloses a time protection method, equipment and medium of an electric power monitoring system, which relate to the technical field of electric power data processing and are used for acquiring clock source information of a clock and acquiring priority of the clock based on basic validity detection and selective validity detection of the clock source; determining a main clock and a standby clock according to the priority of the clocks; transmitting the time message by the network through a time transmission channel, checking the bit of the message, and recording the sending time stamp and the message arrival time stamp of the fault-free message; performing link delay calculation according to the deviation value and the time stamp between the main clock and the standby clock, constructing a plurality of time synchronization error models to evaluate the time synchronization error, and determining an error weight based on an evaluation structure; and optimizing the weighted errors, performing time synchronization, and evaluating and optimizing the time synchronization errors by constructing a plurality of time synchronization error models, so that the accuracy of time synchronization is improved, and the running efficiency and reliability of the power system are improved.
Description
Technical Field
The invention relates to the technical field of power data processing, in particular to a time protection method, equipment and medium of a power monitoring system.
Background
Along with the improvement of the management and operation automation degree of the power system, the informatization of the power system is perfected and the power grid dispatching automation is realized, so that engineering personnel can intensively control and manage each site and equipment in the system by adopting a time synchronization technology through a computer and various instrument equipment, thereby improving the operation efficiency and reliability of the power system.
However, the field devices of the power system are inaccurate in clocks and accumulated in time errors due to temperature changes, electromagnetic interference, aging of oscillators and even computer loads, and the time synchronization problem among the devices also manifests over time, so that if the time control process of the power system is slightly deviated, damage to the power electrical devices, large-scale power outage and life and property electric accidents endangering people can happen at any time.
With the perfection and enhancement of centralized management, global comprehensive fault analysis with higher automation degree of operation, networking and remote information transmission of various microcomputer protection and microcomputer automation devices is generated, and when a plurality of automation devices in power stations in each region transmit fault information to a dispatching center for fault analysis, the clock of the device is not uniform, so that great difficulty is brought to comprehensive analysis.
Therefore, the clock synchronization technology adopted by the current power system has the defects that the clock precision selected in the clock source selection process is poor due to the influence of the specific application environment and other aspects in the system, so that the precision of the clock synchronization is not required, and the time synchronization error is large.
Disclosure of Invention
The invention aims to provide a time protection method, equipment and medium for an electric power monitoring system, which aims to solve the technical problems that the precision of the clock synchronization is not required and the time synchronization error of the monitoring system is large because the clock source validity detection and the selection validity detection of the clock are used for determining a main clock and a standby clock, and the time synchronization error of the monitoring system and the main clock and the standby clock is evaluated and optimized to obtain the accurate time synchronization error and improve the time synchronization precision of the monitoring system.
The invention is realized by the following technical scheme:
the invention provides a time protection method of a power monitoring system, which comprises the following specific steps:
acquiring clock source information of a clock, and detecting and selecting validity based on basic validity of the clock source to obtain priority of the clock;
determining a main clock and a standby clock according to the priority of the clocks;
transmitting the time message by the network through a time transmission channel, checking the bit of the message, and recording the sending time stamp and the message arrival time stamp of the fault-free message;
according to the network between the power monitoring system and the main clock, performing link time delay calculation on the time stamp of the time message, and constructing a time synchronization error model of the power monitoring system and the main clock;
performing link delay calculation according to the network time stamp of the time message between the power monitoring system and the standby clock, and constructing a time synchronization error model of the power monitoring system and the standby clock;
evaluating the time synchronization error of the power monitoring system through a time synchronization error model of the power monitoring system and the main clock and a time synchronization error model of the power monitoring system and the standby clock, and determining the error weight of the main clock and the standby clock based on the evaluated time synchronization error of the power monitoring system;
and adjusting the weighted time synchronization error to perform time synchronization.
The invention determines the main clock and the standby clock through the basic validity detection and the selective validity detection of the clock source, improves the quality of clock selection through optimizing and selecting the main clock and the standby clock, ensures the reliability of the main clock, carries out link delay calculation on the time stamp of the effective message obtained by carrying out fault detection on the message, determines the time synchronization error, evaluates and optimizes the time synchronization error, and improves the precision of time synchronization.
Further, the determining the primary clock and the standby clock specifically includes:
acquiring a clock source, initializing clock source parameters, and performing basic validity detection on a clock source signal:
if the clock sources are invalid, the clock is in an initialized state or a timekeeping state;
if the basic validity of one clock source is judged to be valid, determining that the clock is a master clock;
if two or more clock sources are basically valid, the selection validity of the basically valid clock sources is judged, and if the clock sources are selected to be valid, the main clock and the standby clock are determined according to the priority of the clocks.
Further, the checking the flag bit of the message specifically includes:
judging the main clock state zone bit of the network opposite time message of the main clock, if the main clock zone bit is abnormal, ignoring the message data, otherwise, receiving the message and analyzing the message.
Further, the recording the sending time stamp and the message arrival time stamp of the fault-free message specifically includes:
the power monitoring system sends an NTP synchronous request to a main clock, and records a time stamp T1 for sending the NTP synchronous request;
the master clock receives an NTP synchronous request of the power monitoring system and records an arrival time stamp T2 of the NTP synchronous request;
the master clock responds to an NTP synchronous request of the power monitoring system, sends an NTP response message, and records a sending time stamp T3 of the NTP response message;
the power monitoring system receives the NTP response message and records the arrival time stamp T4 of the NTP response message.
Further, the building the error model for the time synchronization between the power monitoring system and the master clock specifically includes:
acquiring transmission time of the power monitoring system and the master clock network in the target period, and determining a transmission time average value;
and constructing a power monitoring system and a master clock time synchronization error model by combining the time stamp data sent by the message and the message arrival time stamp data:
；
；
wherein,represents the transmission time average value, T represents the time synchronization times, T ci The transmission time of the synchronous message of the power monitoring system and the main clock time is represented by i=1, 2,3>Representing time synchronization between power monitoring system and master clockError, k=1, 2,3, … T, T representing the maximum number of time syncs, T1, T2, T3 and T4 representing different time stamps, respectively.
Further, the evaluating the time synchronization error of the power monitoring system specifically includes:
respectively determining time synchronization error mean values of the main clock and the standby clock according to the time synchronization error model of the power monitoring system and the main clock and the time synchronization error model of the power monitoring system and the standby clock;
respectively acquiring the mean square error of time synchronization errors from the cut-off of the main clock and the standby clock to the time synchronization of the t time;
correcting the mean square error of the time synchronization error, and constructing an evaluation model;
；
；
；
wherein,representing time synchronization error, T representing time synchronization times, T representing maximum time synchronization times, tableMean value of time synchronization error is shown,/->The mean square error of the time synchronization error of the t time synchronization is represented, P represents an evaluation function, and exp is an exponential function.
Further, the determining the error weights of the primary clock and the standby clock specifically includes:
constructing a judgment matrix based on the evaluation model, carrying out consistency test on the judgment matrix to obtain a consistency index and a consistency proportion, and determining an error weight based on the consistency index and the consistency proportion;
；
；
wherein P is i Represents the consistency index, P j Represents the consistency index proportion, X ij The judgment matrix is represented as an m×m matrix, and ω represents the error weight.
Further, the adjusting the weighted time synchronization error specifically includes:
calculating according to the error weight to obtain a relative time synchronization error;
acquiring a value range of the error weight, and adopting normalization constraint to constrain the error weight;
an optimization model is built based on the relative time synchronization error, the value range of the error weight and the constrained weight error;
；
；
；
；
wherein,representing time synchronization error, t representing time synchronization times, ω representing error weight, i=1, 2,3, …, m, < >>Representing real time synchronization error, < >>Representing relative time synchronization error, C 1 The value range of the error weight, C 2 And (3) representing the error weight by adopting a normalization constraint, wherein min represents a minimum value, and s.t. represents a constraint condition.
A second aspect of the present invention provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing a power monitoring system time protection method when executing the program.
A third aspect of the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a power monitoring system time protection method.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention determines the main clock and the standby clock through the basic validity detection and the selective validity detection of the clock source, improves the clock selection quality through optimizing and selecting the main clock and the standby clock, ensures the reliability of the main clock, carries out link delay calculation on the time stamp of the effective message obtained by carrying out fault detection on the message, determines the time synchronization error, evaluates and optimizes the time synchronization error, and improves the precision of the time synchronization.
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In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are needed in the examples will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and that other related drawings may be obtained from these drawings without inventive effort for a person skilled in the art. In the drawings:
fig. 1 is a schematic diagram of a time protection method of a power monitoring system according to an embodiment of the invention.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present invention and the descriptions thereof are for illustrating the present invention only and are not to be construed as limiting the present invention.
As a possible embodiment, as shown in fig. 1, the first aspect of the present embodiment provides a time protection method for a power monitoring system, including the following specific steps:
acquiring clock source information of a clock, and detecting and selecting validity based on basic validity of the clock source to obtain priority of the clock;
determining a main clock and a standby clock according to the priority of the clocks;
transmitting the time message by the network through a time transmission channel, checking the bit of the message, and recording the sending time stamp and the message arrival time stamp of the fault-free message;
according to the network between the power monitoring system and the main clock, performing link time delay calculation on the time stamp of the time message, and constructing a time synchronization error model of the power monitoring system and the main clock;
performing link delay calculation according to the network time stamp of the time message between the power monitoring system and the standby clock, and constructing a time synchronization error model of the power monitoring system and the standby clock;
evaluating the time synchronization error of the power monitoring system through a time synchronization error model of the power monitoring system and the main clock and a time synchronization error model of the power monitoring system and the standby clock, and determining the error weight of the main clock and the standby clock based on the evaluated time synchronization error of the power monitoring system;
and adjusting the weighted time synchronization error to perform time synchronization.
According to the method, the device and the system, the primary clock and the standby clock are determined through the basic validity detection and the selective validity detection of the clock source, the quality of clock selection is improved through optimizing and selecting the primary clock and the standby clock, the reliability of the primary clock is guaranteed, the time stamp of the effective message obtained through fault detection of the message is subjected to link time delay calculation, the time synchronization error is determined, the time synchronization error is evaluated and optimized, and the time synchronization precision is improved.
In some possible embodiments, when the clock receives multiple time source signals simultaneously, signal validity detection needs to be performed on the received time source signals, wherein the validity detection is divided into basic validity detection and selective validity detection, and the clock source signals after the validity detection are transmitted to an internal reference part of the clock. The clock internal reference will calibrate the frequency source accuracy and second signal phase of the system based on the input time source signal. Based on the basic validity detection and the selective validity detection of the clock source, the priority of the clock source is obtained, and the selection process specifically comprises the following steps:
the determining the primary clock and the standby clock specifically comprises:
acquiring a clock source, initializing clock source parameters, and performing basic validity detection on a clock source signal:
if the clock sources are invalid, the clock is in an initialized state or a timekeeping state;
if the basic validity of one clock source is judged to be valid, determining that the clock is a master clock;
if two or more clock sources are basically valid, the selection validity of the basically valid clock sources is judged, and if the clock sources are selected to be valid, the main clock and the standby clock are determined according to the priority of the clocks.
Basic validity detection is mainly performed for the periodicity and stability of the signal, for the time format and continuous increment of the time information. When the basic validity detection of the signal and the time information is satisfied, the basic validity of the time source can be confirmed, and the time source is participated in the selection.
The selection validity detection mainly detects whether the consistency between a plurality of time sources and the internal clock, namely whether the time information is consistent and whether the second edge mutual difference is smaller than a certain threshold value. And selecting a time source with high priority from the time sources which meet the two detection requirements as a main clock source.
In some possible embodiments, since a plurality of ports all use a single communication path to communicate in the process of sending a message, data congestion may result in data congestion and message data errors, so that the situation needs to be detected, and the process of sending the message includes performing fault detection on the message:
the checking of the flag bit of the message specifically comprises the following steps:
judging the main clock state zone bit of the network opposite time message of the main clock, if the main clock zone bit is abnormal, ignoring the message data, otherwise, receiving the message and analyzing the message.
In some possible embodiments, the recording the sending time stamp and the arrival time stamp of the fault-free message by sending the message to the standby clock through the primary clock specifically includes:
the power monitoring system sends an NTP synchronous request to a main clock, and records a time stamp T1 for sending the NTP synchronous request;
the master clock receives an NTP synchronous request of the power monitoring system and records an arrival time stamp T2 of the NTP synchronous request;
the master clock responds to an NTP synchronous request of the power monitoring system, sends an NTP response message, and records a sending time stamp T3 of the NTP response message;
the power monitoring system receives the NTP response message and records the arrival time stamp T4 of the NTP response message.
After the standby clock receives the delay request response message, the arrival time stamp T4 of the delay request response message is analyzed and recorded.
The measurement and calculation of the clock offset value and the link delay value between the nodes are realized through the time information obtained in the process of receiving and transmitting the messages of the main clock and the standby clock, and the local clock is adjusted by an algorithm according to the calculated offset value to realize the clock synchronization of each node.
In some possible embodiments, constructing the power monitoring system and master clock time synchronization error model specifically includes:
acquiring transmission time of the power monitoring system and the master clock network in the target period, and determining a transmission time average value;
and constructing a power monitoring system and a master clock time synchronization error model by combining the time stamp data sent by the message and the message arrival time stamp data:
；
；
wherein,represents the transmission time average value, T represents the time synchronization times, T ci The transmission time of the synchronous message of the power monitoring system and the main clock time is represented by i=1, 2,3>Representing the time synchronization error between the power monitoring system and the master clock, k=1, 2,3, … T, T representing the maximum number of time syncs, T1, T2, T3 and T4 representing different time stamps, respectively.
In some possible embodiments, the evaluating the power monitoring system time synchronization error specifically includes:
determining the mean value of the time synchronization errors of the main clock and the standby clock according to the time synchronization error model of the power monitoring system and the main clock and the time synchronization error model of the power monitoring system and the standby clock respectively；
Respectively obtaining the mean square error of time synchronization errors from the cut-off of the main clock and the standby clock to the time synchronization of the t time；
Correcting the mean square error of the time synchronization error, and constructing an evaluation model；
Wherein,representing time synchronization error, T representing time synchronization times, T representing maximum time synchronization times, +.>Represents the mean value of time synchronization errors,/-, and>the mean square error of the time synchronization error of the t time synchronization is represented, P represents an evaluation function, and exp is an exponential function.
In some possible embodiments, determining the primary clock and the backup clock error weights specifically includes:
constructing an m multiplied by m judgment matrix based on the evaluation model:；
consistency test is carried out on the judgment matrix to obtain a consistency index P i And a consistency ratio P j Based on the consistency index P i And a consistency ratio P j Determining an error weight:。
in some possible embodiments, adjusting the weighted time synchronization error specifically includes:
and calculating according to the error weight to obtain a relative time synchronization error:，/>；
acquiring a value range of the error weight, and adopting normalization constraint to constrain the error weight;
an optimization model is built based on the relative time synchronization error, the value range of the error weight and the constrained weight error:
；
；
wherein,representing time synchronization error, t representing time synchronization times, ω representing error weight, i=1, 2,3, …, m, < >>Representing real time synchronization error, < >>Representing relative time synchronization error, C 1 The value range of the error weight, C 2 And (3) representing the error weight by adopting a normalization constraint, wherein min represents a minimum value, and s.t. represents a constraint condition.
A second aspect of the present embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements a power monitoring system time protection method when executing the program.
A third aspect of the present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a power monitoring system time protection method.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (6)
1. The time protection method of the power monitoring system is characterized by comprising the following specific steps of:
acquiring clock source information of a clock, when the clock receives multiple paths of time source signals at the same time, performing signal validity detection on the received time source signals, wherein the validity detection is divided into basic validity detection and selective validity detection, the clock source signals subjected to the validity detection are transmitted to an internal clock reference part, the internal clock reference calibrates the frequency source precision and second signal phase of a system according to the input time source signals, and the priority of the clock source is obtained based on the basic validity detection and selective validity detection of the clock source, and the main clock and the standby clock are determined according to the priority of the clock, and specifically comprises the following steps:
detecting the periodicity and stability of the signal according to the basic validity detection, detecting the time format and continuous increment of the time information;
after the signal and the time information meet the basic effectiveness detection, confirming that the time source is basically effective and participating in the selection of the time source;
detecting consistency among a plurality of time sources and an internal clock according to the selection validity detection, acquiring time sources with consistent time information and a second edge mutual difference smaller than a threshold value, and selecting a high-priority time source as a main clock source;
transmitting the time message by the network through a time transmission channel, checking the bit of the message, and recording the sending time stamp and the message arrival time stamp of the fault-free message;
according to the network between the power monitoring system and the main clock, performing link time delay calculation on the time stamp of the time message, and constructing a time synchronization error model of the power monitoring system and the main clock;
performing link delay calculation according to the network time stamp of the time message between the power monitoring system and the standby clock, and constructing a time synchronization error model of the power monitoring system and the standby clock;
the recording of the sending time stamp and the arrival time stamp of the fault-free message specifically comprises the following steps:
the power monitoring system sends an NTP synchronous request to a main clock, and records a time stamp T1 for sending the NTP synchronous request;
the master clock receives an NTP synchronous request of the power monitoring system and records an arrival time stamp T2 of the NTP synchronous request;
the master clock responds to an NTP synchronous request of the power monitoring system, sends an NTP response message, and records a sending time stamp T3 of the NTP response message;
the power monitoring system receives the NTP response message and records the arrival time stamp T4 of the NTP response message;
the construction of the power monitoring system and the main clock time synchronization error model specifically comprises the following steps:
acquiring transmission time of the power monitoring system and the master clock network in the target period, and determining a transmission time average value;
and constructing a power monitoring system and main clock time synchronization error model and a power monitoring system and main clock time synchronization error model by combining the time stamp data sent by the message and the message arrival time stamp data:
wherein,represents the transmission time average value, T represents the time synchronization times, T cn Representing transmission time of synchronous message between power monitoring system and main clock time, n represents transmission times, delta t Representing a time synchronization error between the power monitoring system and the master clock, k=1, 2,3, … T, T representing a maximum number of time synchronizations;
evaluating the time synchronization error of the power monitoring system through a time synchronization error model of the power monitoring system and the main clock and a time synchronization error model of the power monitoring system and the standby clock, and determining the error weight of the main clock and the standby clock based on the evaluated time synchronization error of the power monitoring system;
the evaluation of the time synchronization error of the power monitoring system specifically comprises the following steps:
respectively determining time synchronization error mean values of the main clock and the standby clock according to the time synchronization error model of the power monitoring system and the main clock and the time synchronization error model of the power monitoring system and the standby clock;
respectively acquiring the mean square error of time synchronization errors from the cut-off of the main clock and the standby clock to the time synchronization of the t time;
correcting the mean square error of the time synchronization error, and constructing an evaluation model;
wherein delta t Represents a time synchronization error, T represents a time synchronization number, T represents a maximum time synchronization number,representing the mean value, sigma of time synchronization errors δ The mean square error of time synchronization errors of the t time synchronization is represented, P represents an evaluation function, and exp is an exponential function;
the determining the error weights of the main clock and the standby clock specifically comprises the following steps:
constructing a judgment matrix based on the evaluation model, carrying out consistency test on the judgment matrix to obtain a consistency index and a consistency proportion, and determining an error weight based on the consistency index and the consistency proportion;
wherein P is i Represents the consistency index, P j Represents the consistency index proportion, X ij Representing a judgment matrix, which is an m×m matrix, wherein ω represents an error weight;
and adjusting the weighted time synchronization error to perform time synchronization.
2. The method for protecting a power monitoring system according to claim 1, wherein determining the primary clock and the backup clock specifically comprises:
acquiring a clock source, initializing clock source parameters, and performing basic validity detection on a clock source signal:
if the clock sources are invalid, the clock is in an initialized state or a timekeeping state;
if the basic validity of one clock source is judged to be valid, determining that the clock is a master clock;
if two or more clock sources are basically valid, the selection validity of the basically valid clock sources is judged, and if the clock sources are selected to be valid, the main clock and the standby clock are determined according to the priority of the clocks.
3. The method for protecting the time of the power monitoring system according to claim 1, wherein the checking the flag bit of the message specifically includes:
judging the main clock state zone bit of the network opposite time message of the main clock, if the main clock zone bit is abnormal, ignoring the message data, otherwise, receiving the message and analyzing the message.
4. The method for protecting a power monitoring system according to claim 1, wherein the adjusting the weighted time synchronization error specifically comprises:
calculating according to the error weight to obtain a relative time synchronization error;
acquiring a value range of the error weight, and adopting normalization constraint to constrain the error weight;
an optimization model is built based on the relative time synchronization error, the value range of the error weight and the constrained weight error;
δ Γ ＝|δ-δ′ t |
wherein delta t Represents time synchronization error, t represents time synchronization times, ω represents error weight, i=1, 2,3, …, m, δ t ' represents the true time synchronization error, delta Γ Representing relative time synchronization error, C 1 The value range of the error weight, C 2 Representing constraining the error weights using a normalized constraint.
5. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the power monitoring system time protection method of any one of claims 1 to 4 when the program is executed by the processor.
6. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the power monitoring system time protection method according to any one of claims 1 to 4.
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