CN113219282A - Novel microcomputer protection constant value checking method - Google Patents
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Abstract
The invention discloses a novel microcomputer protection constant value checking method, which comprises the steps of collecting a constant value of a microcomputer protection device, and carrying out standardized processing on the constant value to obtain model sample data; establishing a constant value check model based on a neural network, inputting model sample data to an input layer of the constant value check model, and obtaining a model weight; adjusting the model weight by designing an error function, stopping adjusting until the total error measure of the model sample data meets the requirement, and finishing the training of the constant value check model; checking the internal constant value of the microcomputer protection device by using the trained constant value checking model; the invention realizes the quick and accurate check of the microcomputer definite value by combining the neural network, on one hand, the labor cost is reduced, and on the other hand, the huge safety economic risk caused by the negligence of checking the definite value by personnel is avoided.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a novel microcomputer protection constant value checking method.
Background
The fixed value check is an important link of daily and maintenance work of the microcomputer relay protection device. After each time of finishing protection check or modifying protection fix planting, the fixed value of the latest version needs to be checked repeatedly. If the fixed value input by the microcomputer protection device deviates from the standard fixed value on the fixed value sheet, potential safety hazards are caused.
At present, the microcomputer protection setting value check mostly adopts a manual check method, and one person checks and then rechecks by a second person. Usually, a 6kV bus carries more than 20 loads, each load has hundreds of protection constants, and a generator transformer bank protection device has hundreds of protection constants. The workload of manually checking the fixed value is huge and the process is complicated, and once negligence happens, protection refusal action or misoperation can be caused, and the safe and stable operation of the unit is seriously threatened.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the invention provides a novel microcomputer protection constant value checking method, which can clearly and quickly find problem items in a plurality of constant values and finish constant value checking and modifying work.
In order to solve the technical problems, the invention provides the following technical scheme: the method comprises the steps of collecting a fixed value of a microcomputer protection device, and carrying out standardization processing on the fixed value to obtain model sample data; establishing a constant value check model based on a neural network, inputting model sample data to an input layer of the constant value check model, and obtaining a model weight; adjusting the model weight by designing an error function, stopping adjusting until the total error measure of the model sample data meets the requirement, and finishing the training of the constant value check model; and checking the internal constant value of the microcomputer protection device by using the trained constant value checking model.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the fixed values include a motor protection fixed value, a transformer differential protection fixed value, a capacitor protection fixed value and a generator differential protection fixed value.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the normalization process includes the steps of,
wherein i and j are sample numbers, n is the number of samples, yiFor the model sample data, xiIs the constant value.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the method for constructing the constant value checking model comprises the following steps that the constant value checking model is composed of an input layer node Q, an output layer node U and a hidden layer node H, and the function expression of the constant value checking model is as follows:
wherein Y is an output vector of the constant value check model, x is an input vector of the constant value check model,
is the weight coefficient, ω, of the ith input level node to the ith hidden level node HHYThe weight coefficient from the hidden layer node to the output layer node U, and a is the applied bias.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the model weight values include, for example,
where ω (i +1) is the model weight at the next moment, ω (i) is the initial weight of the model, δ (i) is the learning rate, and λ is the momentum factor.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the error function may include one or more of,
where s is the input sample of the model, P is the error function, U(s) is the model output, and T is the transposed symbol.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the total degree of error comprises the following steps,
setting the weight value adjusting conditions as follows:
E<0.05；
wherein E is the total error measure, and k is the model learning times.
As a preferable embodiment of the novel microcomputer protection constant value checking method according to the present invention, wherein: the input vector of the check model with the fixed value comprises,
wherein x isi(s) is the input vector of the s-th input, β (-) is the activation function of the hidden node, nQIs the number of nodes of the input layer, nHFor the number of hidden layer nodes, omegaQHAs weights, ω, of the input layer to the hidden layerHHL is the s-th input, which is the weight from hidden layer to hidden layer.
The invention has the beneficial effects that: the invention realizes the quick and accurate check of the microcomputer definite value by combining the neural network, on one hand, the labor cost is reduced, and on the other hand, the huge safety economic risk caused by the negligence of checking the definite value by personnel is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic flow chart illustrating a method for checking a protection setting value of a microcomputer according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a calibration value checking model of a novel microcomputer protection calibration value checking method according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating the verification result of a novel microcomputer protection constant value verification method according to a second embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a verification result of a novel microcomputer protection constant value verification method according to a second embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 2, a first embodiment of the present invention provides a novel microcomputer protection constant value checking method, including:
s1: and collecting a fixed value of the microcomputer protection device, and carrying out standardization processing on the fixed value to obtain model sample data.
The collection constant value types of the embodiment include a motor protection constant value, a transformer differential protection constant value, a capacitor protection constant value and a generator differential protection constant value.
Further, the collected fixed values are subjected to standardization processing to eliminate error data; the normalization process is performed according to the following formula:
wherein i and j are sample numbers, n is the number of samples, yiFor model sample data, xiIs a constant value.
S2: and constructing a constant value check model based on the neural network, inputting model sample data to an input layer of the constant value check model, and obtaining a model weight.
A constant value check model is constructed based on a BP (Back propagation) neural network, referring to FIG. 2, the constant value check model is composed of an input layer node Q, an output layer node U and a hidden layer node H, and experimental verification proves that the learning effect of the model is best when the input layer node Q is set to be 8, the output layer node U is set to be 3 and the hidden layer node H is set to be 7;
the function of the constant value collation model is expressed as follows:
wherein Y is an output vector of the constant value check model, x is an input vector of the constant value check model,
is the weight coefficient, ω, of the ith input level node to the ith hidden level node HHYThe weight coefficient from the hidden layer node to the output layer node U, and a is the applied bias.
Specifically, the input vector of the constant value check model is as follows:
wherein x isi(s) is the input vector of the s-th input, β (-) is the activation function of the hidden node, nQIs the number of nodes of the input layer, nHFor the number of hidden layer nodes, omegaQHAs weights, ω, of the input layer to the hidden layerHHL is the s-th input, which is the weight from hidden layer to hidden layer.
The model weight is as follows:
where ω (i +1) is the model weight at the next moment, ω (i) is the initial weight of the model, δ (i) is the learning rate, and λ is the momentum factor.
S3: and adjusting the model weight by designing an error function, and stopping adjusting until the total error measure of the model sample data meets the requirement, thereby finishing the training of the constant value check model.
Because feedback connection exists in the constant value check model, when training aiming at data check is carried out on the constant value check model, the calculation of an error gradient is more complex, and thus the weight estimation of the constant value check model is also complex; therefore, the difficulty of weight adjustment is reduced by designing an error function.
Designing an error function based on an output vector of the constant value check model:
where s is the input sample of the model, P is the error function, U(s) is the model output, and T is the transposed symbol.
Setting the weight value adjusting conditions as follows:
E<0.05；
and when the total error measure is less than 0.05, stopping adjusting the weight value.
Wherein the function expression of the error total measure is as follows:
wherein E is the total error measure, and k is the model learning times.
S4: and checking the internal constant value of the microcomputer protection device by using the trained constant value checking model.
The collected internal constant values (the types of the internal constant values also comprise a motor protection constant value, a transformer differential protection constant value, a capacitor protection constant value and a generator differential protection constant value) of the microcomputer protection device are input to an input layer of a trained constant value check model, and a check result is obtained by an output layer.
Example 2
In order to verify and explain the technical effects adopted in the method, the embodiment selects the traditional technical scheme and adopts the method to perform comparison test, and compares the test results by means of scientific demonstration to verify the real effect of the method.
The traditional technical scheme generally adopts a manual checking mode and a software checking mode, the workload of manually checking a fixed value is huge, the process is complicated, and once negligence happens, protection refusal or misoperation can be caused, so that the safe and stable operation of a unit is seriously threatened; before each protection check, the software check guides the internal fixed value of each protection device into a computer through the matched software of the protection device, and the internal fixed value is filed into a txt or xls format, and the fixed value is consistent with the fixed value on the fixed value list; after the protection verification is finished, the fixed value of the protection device is imported into the computer in the same format; the method compares the whole contents of the two constant value files by using Beyond company software, has higher checking speed and accuracy than manual checking, but has complicated steps and unsatisfied checking effect.
In order to verify that the method has higher checking efficiency and accuracy compared with the traditional technical scheme, the traditional technical scheme and the method are adopted to respectively check and compare 1000 microcomputer setting values in real time in the embodiment.
And (3) testing environment: an Inter Core i7-6500U, 12G memory with a CPU master frequency of 2.5 GHz; the method adopts Python as an operation platform.
Respectively checking 1000 number 1 total transformers 6kV 1B definite values (250 motor protection definite values, 250 transformer differential protection definite values, 250 capacitor protection definite values and 250 generator differential protection definite values) by adopting a traditional technical scheme (manual checking and software checking) and the method, wherein the manual checking is carried out by one person and then rechecked by a second person; the method inputs 1000 microcomputer constant values into a constant value checking model through Python to obtain results, and partial checking effects of the method are shown in the following table and are shown in figures 3 and 4.
Table 1: and (5) checking a result comparison table.
As can be seen from table 1, fig. 3 and fig. 4, compared with the conventional technical method, the method has the advantages that the fixed value checking effect is greatly improved, more than 98% of time is saved, on one hand, the labor cost is reduced, and on the other hand, the huge safety economic risk caused by negligence of personnel checking the fixed value is avoided.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A novel microcomputer protection constant value checking method is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
collecting a fixed value of a microcomputer protection device, and carrying out standardization processing on the fixed value to obtain model sample data;
establishing a constant value check model based on a neural network, inputting model sample data to an input layer of the constant value check model, and obtaining a model weight;
adjusting the model weight by designing an error function, stopping adjusting until the total error measure of the model sample data meets the requirement, and finishing the training of the constant value check model;
and checking the internal constant value of the microcomputer protection device by using the trained constant value checking model.
2. The novel microcomputer protection constant value verification method as claimed in claim 1, wherein: the fixed value comprises that the fixed value comprises,
a motor protection constant, a transformer differential protection constant, a capacitor protection constant, and a generator differential protection constant.
3. The novel microcomputer protection constant value verification method as claimed in claim 2, wherein: the normalization process includes the steps of,
wherein i and j are sample numbers, n is the number of samples, yiFor the model sample data, xiIs the constant value.
4. A novel microcomputer protection constant value verification method as claimed in claim 1 or 2, characterized in that: constructing the constant value collation model includes,
the definite value checking model is composed of an input layer node Q, an output layer node U and a hidden layer node H, and the function expression of the definite value checking model is as follows:
wherein Y is an output vector of the constant value check model, x is an input vector of the constant value check model,
is the weight coefficient, ω, of the ith input level node to the ith hidden level node HHYThe weight coefficient from the hidden layer node to the output layer node U, and a is the applied bias.
5. The novel microcomputer protection constant value verification method as claimed in claim 4, wherein: the model weight values include, for example,
where ω (i +1) is the model weight at the next moment, ω (i) is the initial weight of the model, δ (i) is the learning rate, and λ is the momentum factor.
6. A novel microcomputer protection constant value verification method as claimed in claim 2 or 5, wherein: the error function may include one or more of,
where s is the input sample of the model, P is the error function, U(s) is the model output, and T is the transposed symbol.
7. The novel microcomputer protection constant value verification method as claimed in claim 6, wherein: the total degree of error comprises the following steps,
setting the weight value adjusting conditions as follows:
E<0.05；
wherein E is the total error measure, and k is the model learning times.
8. A novel microcomputer protection constant value verification method as claimed in claim 3, wherein: the input vector of the check model with the fixed value comprises,
wherein x isi(s) is the input vector of the s-th input, β (-) is the activation function of the hidden node, nQFor input layer sectionNumber of points, nHFor the number of hidden layer nodes, omegaQHAs weights, ω, of the input layer to the hidden layerHHL is the s-th input, which is the weight from hidden layer to hidden layer.
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| CN116187248A (en) * | 2023-03-13 | 2023-05-30 | 华能新能源股份有限公司河北分公司 | Relay protection fixed value analysis and verification method and system based on big data |
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