CN116706840B - Power plant network-related loss of magnetic protection fixed value checking and optimizing method and system - Google Patents
Power plant network-related loss of magnetic protection fixed value checking and optimizing method and system Download PDFInfo
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- H—ELECTRICITY
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Abstract
The invention discloses a method and a system for checking and optimizing a fixed value of network-related loss magnetic protection of a power plant, which relate to the technical field of relay protection of a power system and comprise the steps of obtaining operation and equipment parameters of a generator protection device, wherein the operation and equipment parameters comprise a device characteristic variable value, a loss magnetic protection fixed value item and fixed value, generator equipment parameters and system equivalent fixed values; according to the operation and equipment parameters, combining with the actual execution check rule of the automatic identification generator protection device, and obtaining a check rule calculation result; and carrying out deviation degree judgment on the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, and checking the fixed value of the loss magnetic protection according to the judgment result. The invention automatically identifies the characteristics of the relay protection device, provides a technology for automatically identifying a fixed value checking rule based on the configuration condition of the protection device, and fully utilizes a fixed value checking method with a checking rule calculated by a mathematical formula, thereby greatly improving the correctness of the fixed value of the power plant network-related loss magnetic protection and ensuring the safe and reliable operation of a power grid.
Description
Technical Field
The invention relates to the technical field of power system relay protection, in particular to a power plant network-related loss of magnetic protection fixed value checking and optimizing method and system.
Background
The power plant is used as an electric energy production link of an electric power system and is an important component part for national production and living energy supply. The correctness of the network-related relay protection fixed value of the power plant is an important guarantee for safe and stable operation of the power system. And the loss of excitation protection of the generator is taken as a part of the protection of the grid, so that the verification of the fixed value of the generator by adopting an accurate method is extremely important.
The manufacturers of the relay protection devices of the generator sets in China are various, and the maximum configuration requirements of the protection of the generator transformer sets are fully considered in the design of the relay protection devices. The generator loss-of-excitation protection configurable item comprises stator impedance characteristics, rotor voltage configuration and system low-voltage switching. And selecting the configuration of the device related to the loss magnetic protection by different control word fixed values in the control word part of the fixed value list of the relay protection device, wherein 0 represents withdrawal, 1 represents input, 0 represents a static circle, and 1 represents an asynchronous circle. And the fixed value of the loss magnetic protection fixed value item is displayed on the protection fixed value part of the fixed value list of the relay protection device, and the fixed value and the protection fixed value part are required to be mutually corresponding. On the other hand, the generator type is mainly divided into a steam turbine and a water turbine, the protection devices of the generator configurations of different generator types are different, the setting methods of the fixed values under the same device configuration of the loss-of-excitation protection of the protection devices of different generator types are different, if the stator impedance characteristics are steady boundary circles and the rotor voltage configuration is changed to excitation voltage, the setting methods of the related fixed values are different, and the corresponding fixed value checking methods are also different. The actual checking of the fixed value of the power plant network-related loss of magnetic protection is realized manually, so that the accuracy of the fixed value in a rough range and an order of magnitude can be judged, the accuracy of the checking result is not high, the accuracy of the fixed value can not be checked according to the configuration condition of the relay protection device and the type of the generator, the problem of the fixed value of the power plant network-related loss of magnetic protection can not be found in time, and the accurate management and control of the fixed value of the power plant network-related protection by a dispatching mechanism are not facilitated. When the fixed value check of the generator network-related loss magnetic protection is performed, the fixed value check method based on the device characteristics can be used for improving the accuracy of the fixed value of the generator network-related loss magnetic protection, so that the normal operation of the relay protection device of the power plant is ensured, and finally the safe and stable operation of the power plant and the power grid is ensured.
Disclosure of Invention
The present invention has been made in view of the above-described problems occurring in the prior art.
Therefore, the invention provides a fixed value checking and optimizing method and a fixed value checking and optimizing system for power plant network-related loss magnetic protection, which solve the problem of inaccurate manual loss magnetic protection checking.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the invention provides a power plant network-related loss of magnetic protection fixed value checking and optimizing method, which comprises the following steps: acquiring operation and equipment parameters of a generator protection device, wherein the operation and equipment parameters comprise device characteristic variable values, loss of magnetic protection fixed value items and fixed values, and quantitative parameters of the generator equipment parameters and system equivalent;
according to the operation and equipment parameters, combining with the actual execution check rules of the automatic identification generator protection device, and obtaining a check rule calculation result;
and carrying out deviation degree judgment on the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, and checking the fixed value of the loss magnetic protection according to the judgment result.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps: the device characteristic variables are expressed as:
；
wherein A1 is a generator type, A2 is a system low-voltage input configuration, A3 is a stator impedance characteristic configuration, and A4 is a rotor voltage configuration.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps: the actual execution checking rule of the automatic identification generator protection device comprises the following steps: each loss-of-magnetic protection constant value item has two checking rules, and the corresponding relation with the device characteristic can be realized by adopting the following matrix calculation process, wherein the matrix is expressed as follows:
；
wherein, the liquid crystal display device comprises a liquid crystal display device,is a check rule of low voltage fixed value when the system low voltage configuration is put into operation, +.>Is a check rule of low voltage fixed value when the system low voltage is configured to be withdrawn, +.>Is checking the impedance fixed value when the stator impedance characteristic is configured as asynchronous circleRule (S)>Is a check rule of impedance fixed value when the generator type is a water turbine and the stator impedance characteristic is configured as a stable circle, < >>Is a check rule of impedance fixed value when the generator type is a steam turbine and the stator impedance characteristic is configured as a stable circle,is a checking rule of a rotor low voltage constant value when the rotor voltage is configured to be equal to the exciting voltage,/>Is a checking rule of a rotor low voltage fixed value when the generator type is a water turbine and the rotor voltage is configured to be changed into exciting voltage, +.>Is a checking rule of rotor exciting voltage coefficient fixed value when the generator type is a steam turbine and the rotor voltage is configured to be changed into exciting voltage, < ->Representing the inverse value, representing mathematical multiplication, wherein D1-D8 are checking rules for checking the fixed value of the loss magnetic protection;
when the value calculated by the device characteristic variable in the matrix is 0, the check rule used for checking the fixed value of the loss magnetic protection is 0, which indicates that the check rule does not participate in checking.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps: and carrying out deviation degree judgment on the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, wherein the method comprises the following steps:
the fixed value checking objective function is expressed as:
；
wherein, the liquid crystal display device comprises a liquid crystal display device,returning a check result of a single fixed value item for loss of magnetic field protection, wherein B is equipment parameter and system equivalent quantification, ++>Setting a value for a single constant value term for loss of field protection, < >>To perform the checking rules of the check.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps: further comprises:
fixed value according to single fixed value item of loss of magnetic protectionCheck rule identifying corresponding execution check>；
Extracting a check formula in the check rule, and converting the check formula into a digital calculation formula and formula variables which can be identified by a computer;
according to formula variable definition, intelligently matching corresponding generator equipment parameters and system equivalent ration B;
checking the formula, substituting the formula variable value, performing mathematical operation, and calculating a result value;
checking formula calculated value and single fixed value term fixed value of loss magnetic protectionBy comparison, when the single constant item is protected against loss of magnetization +.>When the difference between the fixed value and the checking calculation result is smaller than the preset deviation degree, the fixed value meets the checking, and the checking result of the single fixed value item of loss of magnetic protection returns to the value +.>Returning true;
when loss of magnetic field protects single constant value item constant valueWhen the difference between the check result and the check calculation result is not smaller than the preset deviation degree, the fixed value does not meet the check, and the check result return value of the single fixed value item of the loss of magnetic protection is +.>Returning to false.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps: and carrying out fixed value check of loss magnetic protection according to the judgment result, wherein the method comprises the following steps:
the total check objective function of the loss of magnetic protection is expressed as:
；
wherein M1-Mn are check results of each constant value item of the loss of magnetic protection,and returning a value for the total checking result of the loss of magnetic protection.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps: further comprises:
when each constant value item of the loss magnetic protection is checked to be met, the total check result of the loss magnetic protection is met, namely the values of M1-Mn are true;
if one of the values M1 to Mn is false, the total check result of the loss of magnetic field protection is warning.
As a preferable scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, the invention comprises the following steps:
in a second aspect, the invention provides a power plant network-related loss of magnetic protection fixed value checking and optimizing system, which comprises the following steps:
the data acquisition module is used for acquiring the operation and equipment parameters of the generator protection device, wherein the operation and equipment parameters comprise a device characteristic variable value, a loss magnetic protection fixed value item and fixed value, generator equipment parameters and system equivalent quantification;
the calculation module is used for automatically identifying the actual execution check rule of the generator protection device according to the operation and equipment parameters to obtain a check rule calculation result;
and the judging module is used for judging the deviation degree of the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, and checking the fixed value of the loss magnetic protection according to the judging result.
In a third aspect, the present invention provides a computing device comprising:
a memory and a processor;
the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions, and the computer executable instructions realize the steps of the power plant network-related loss of magnetic protection fixed value checking and optimizing method when being executed by the processor.
In a fourth aspect, the present invention provides a computer readable storage medium storing computer executable instructions that when executed by a processor implement the steps of the power plant network-related loss of magnetic protection fixed value checking optimization method.
Compared with the prior art, the invention has the beneficial effects that: the invention automatically identifies the characteristics of the relay protection device, provides a technology for automatically identifying a fixed value checking rule based on the configuration condition of the protection device, fully utilizes a fixed value checking method with a checking rule calculated by a mathematical formula, greatly improves the correctness of the fixed value of the power plant network-related loss magnetic protection, and ensures the safe and reliable operation of a power grid
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a flowchart of a method and a system for checking and optimizing a fixed value of power plant network-related loss magnetic protection according to an embodiment of the invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the 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 other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be 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.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not 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 coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, for an embodiment of the present invention, the embodiment provides a power plant network-related loss magnetic protection fixed value checking and optimizing method, which includes:
s1, acquiring operation and equipment parameters of a generator protection device, wherein the operation and equipment parameters comprise device characteristic variable values, loss of magnetic protection fixed value items and fixed values, and quantitative parameters of generator equipment parameters and system equivalent values;
further, the device characteristic variable is expressed as:
；
wherein A1 is a generator type, A2 is a system low-voltage input configuration, A3 is a stator impedance characteristic configuration, and A4 is a rotor voltage configuration;
it should be noted that 0 in the generator type represents a steam turbine, and 1 represents a water turbine; in the system low voltage input configuration, 0 represents exit, 1 represents input; in the stator impedance characteristic configuration, 0 represents a steady circle, and 1 represents an asynchronous circle; in the rotor voltage configuration, 0 represents an equal excitation voltage, and 1 represents a variable excitation voltage.
S2, according to the operation and equipment parameters, combining the actual execution check rules of the automatic identification generator protection device to obtain a check rule calculation result;
further, the automatic identification of the actual execution check rule of the generator protection device includes: each loss-of-magnetic protection constant value item has two checking rules, and the corresponding relation with the device characteristic can be realized by adopting the following matrix calculation process, wherein the matrix is expressed as follows:
；
wherein, the liquid crystal display device comprises a liquid crystal display device,is a check rule of low voltage fixed value when the system low voltage configuration is put into operation, +.>Is a check rule of low voltage fixed value when the system low voltage is configured to be withdrawn, +.>Is a check rule of impedance constant value when the stator impedance characteristic is configured as asynchronous circle, +.>Is a check rule of impedance fixed value when the generator type is a water turbine and the stator impedance characteristic is configured to be a stable circle,is a check rule of impedance fixed value when the generator type is a steam turbine and the stator impedance characteristic is configured as a stable circle, < >>Is a checking rule of a rotor low voltage constant value when the rotor voltage is configured to be equal to the exciting voltage,/>Is a checking rule of a rotor low voltage fixed value when the generator type is a water turbine and the rotor voltage is configured to be changed into exciting voltage, +.>Is a turbine of the generator typeChecking rule of rotor exciting voltage coefficient fixed value when rotor voltage is configured as variable exciting voltage, +.>Representing the inverse value, representing mathematical multiplication, wherein D1-D8 are checking rules for checking the fixed value of the loss magnetic protection;
when the value calculated by the device characteristic variable in the matrix is 0, the check rule used for checking the fixed value of the loss magnetic protection is 0, which indicates that the check rule does not participate in checking.
Further, checking the rule calculation result checks the rule calculation result, including: acquiring a checking conclusion of the objective function;
checking a total objective function, expressed as:
；
wherein E is a loss magnetic protection checking result, A is a device characteristic variable, B is equipment parameter and system equivalent quantification, C is a loss magnetic protection fixed value, and d is a checking rule set.
S3, judging the deviation degree of the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, and checking the fixed value of the loss magnetic protection according to the judgment result;
further, the deviation degree judgment of the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection comprises the following steps:
the fixed value checking objective function is expressed as:
；
wherein, the liquid crystal display device comprises a liquid crystal display device,returning a check result of a single fixed value item for loss of magnetic field protection, wherein B is equipment parameter and system equivalent quantification, ++>Setting a value for a single constant value term for loss of field protection, < >>To perform the checking rules of the check.
It should be noted that,the checking rule for executing checking is based on mathematical formula compiled by the equipment parameter and the system equivalent ration B, and when checking the fixed value, the fixed value in the equipment parameter and the system equivalent ration B is correspondingly substituted into +.>And (3) performing mathematical calculation to obtain a check rule calculation result value.
It should be further noted that the checking of the fixed value of the loss magnetic protection is a calculation process of a flow, and the difference of numerical precision generated when the secondary value of the fixed value of the relay protection is converted into a primary value and the numerical formula is calculated by rounding and reserving decimal places is considered, wherein the deviation degree is introduced into the checking process by 1%, namely, when the difference of the calculated value of the fixed value of the loss magnetic protection and the checking formula is within 1%, the checking is satisfied for the fixed value, otherwise, the checking is not satisfied.
Still further, still include:
fixed value according to single fixed value item of loss of magnetic protectionCheck rule identifying corresponding execution check>；
Extracting a check formula in the check rule, and converting the check formula into a digital calculation formula and formula variables which can be identified by a computer;
according to formula variable definition, intelligently matching corresponding generator equipment parameters and system equivalent ration B;
checking the formula, substituting the formula variable value, performing mathematical operation, and calculating a result value;
checking formula calculated value and single fixed value term fixed value of loss magnetic protectionBy comparison, when the single constant item is protected against loss of magnetization +.>When the difference between the fixed value and the checking calculation result is smaller than the preset deviation degree, the fixed value meets the checking, and the checking result of the single fixed value item of loss of magnetic protection returns to the value +.>Returning true;
when loss of magnetic field protects single constant value item constant valueWhen the difference between the check result and the check calculation result is not smaller than the preset deviation degree, the fixed value does not meet the check, and the check result return value of the single fixed value item of the loss of magnetic protection is +.>Returning to false.
Furthermore, the step of checking the fixed value of the loss of magnetic protection according to the judging result comprises the following steps:
the total check objective function of the loss of magnetic protection is expressed as:
；
wherein M1-Mn are check results of each constant value item of the loss of magnetic protection,and returning a value for the total checking result of the loss of magnetic protection.
Still further, still include:
when each constant value item of the loss magnetic protection is checked to be met, the total check result of the loss magnetic protection is met, namely the values of M1-Mn are true;
if one of the values M1 to Mn is false, the total check result of the loss of magnetic field protection is warning.
The above is an exemplary scheme of the power plant network-related loss of magnetic protection fixed value checking and optimizing method in this embodiment. It should be noted that, the technical scheme of the power plant network-related loss magnetic protection fixed value checking and optimizing system and the technical scheme of the power plant network-related loss magnetic protection fixed value checking and optimizing method belong to the same conception, and in this embodiment, the technical scheme of the power plant network-related loss magnetic protection fixed value checking and optimizing system is not described in detail, and reference can be made to the description of the technical scheme of the power plant network-related loss magnetic protection fixed value checking and optimizing method.
In this embodiment, a power plant network-related loss of magnetic protection fixed value checking and optimizing system includes:
the data acquisition module is used for acquiring the operation and equipment parameters of the generator protection device, wherein the operation and equipment parameters comprise device characteristic variable values, fixed-value items and fixed values of loss magnetic protection, generator equipment parameters and system equivalent quantification;
the calculation module is used for automatically identifying the actual execution check rule of the generator protection device according to the operation and equipment parameters to obtain a check rule calculation result;
and the judging module is used for judging the deviation degree of the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, and checking the fixed value of the loss magnetic protection according to the judging result.
The embodiment also provides a computing device, which is suitable for the situation of the power plant network-related loss of magnetic protection fixed value checking and optimizing method, and comprises the following steps:
a memory and a processor; the memory is used for storing computer executable instructions, and the processor is used for executing the computer executable instructions to realize the method for realizing the fixed value checking and optimizing of the power plant network-related loss of magnetic protection according to the embodiment.
The present embodiment also provides a storage medium, on which a computer program is stored, which when executed by a processor, implements the method for implementing fixed value check optimization of power plant network-related loss of magnetic protection set as proposed in the above embodiment.
The storage medium provided in this embodiment belongs to the same inventive concept as the method for implementing fixed value checking and optimizing of power plant network-related loss magnetic protection provided in the above embodiment, and technical details not described in detail in this embodiment can be seen in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.
From the above description of embodiments, it will be clear to a person skilled in the art that the present invention may be implemented by means of software and necessary general purpose hardware, but of course also by means of hardware, although in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as a floppy disk, a Read Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, etc., including several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to execute the method of the embodiments of the present invention.
Example 2
Referring to tables 1-3, in one embodiment of the present invention, the embodiment is different from the first embodiment in that the beneficial effects of my invention are verified by checking the net loss magnetic protection fixed value of the power plant.
According to the generator protection device fixed value list, 4 values of device characteristic variables and 5 loss magnetic protection fixed values are obtained, as shown in table 1:
table 1 parameters are obtained
According to the device characteristic variables, 4 checking rules of actually executing checking in the embodiment are automatically identified in 8 checking rules, wherein the checking constant value items and the corresponding executed checking rules are shown in table 2:
table 2 check rules
The transient reactance check of the generator is expressed as:
；
wherein, the liquid crystal display device comprises a liquid crystal display device,named value for transient reactance of generator, +.>For generator->Transformation ratio (S/F)>Is a generator terminalA transformation ratio;
the synchronous reactance check of the generator is expressed as:
；
wherein, the liquid crystal display device comprises a liquid crystal display device,the synchronous reactance of the generator is a known value.
Executing the checking rule of each constant value item, and judging the checking result, wherein 1 constant value item returns false,4 constant value items return true, and the checking result statistics of each constant value are shown in table 3:
TABLE 3 check results
As can be seen from Table 3, the check result of the fixed value 1 of the loss magnetic protection impedance is false, and the loss magnetic protection check is not satisfied.
According to the invention, by combining the characteristics of the relay protection device, a plurality of variable factors such as generator type, stator impedance characteristics, rotor voltage configuration, system low voltage switching and the like are considered, and under the condition that generator equipment parameters used for setting the fixed value of the loss magnetic protection and system equivalent issued by a dispatching mechanism are considered as quantitative factors, an improved checking method is adopted to realize accurate checking of the fixed value of the loss magnetic protection, so that the correctness of the fixed value of the loss magnetic protection of the generator in a network-related manner is ensured.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, 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 the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (4)
1. The method for checking and optimizing the fixed value of the power plant network-related loss magnetic protection is characterized by comprising the following steps of:
acquiring operation and equipment parameters of a generator protection device, wherein the operation and equipment parameters comprise device characteristic variable values, loss of magnetic protection fixed value items and fixed values, and quantitative parameters of the generator equipment parameters and system equivalent; the device characteristic variables are expressed as:
wherein A1 is a generator type, A2 is a system low-voltage input configuration, A3 is a stator impedance characteristic configuration, and A4 is a rotor voltage configuration;
according to the operation and equipment parameters, combining with the actual execution check rules of the automatic identification generator protection device, and obtaining a check rule calculation result; each loss-of-magnetic protection constant value item has two checking rules, the corresponding relation with the device characteristic is realized by adopting the following matrix calculation process, and the matrix is expressed as follows:
wherein d1 is a check rule of a low-voltage fixed value when the system low voltage is configured as input, d2 is a check rule of a low-voltage fixed value when the system low voltage is configured as exit, d3 is a check rule of an impedance fixed value when the stator impedance characteristic is configured as asynchronous circle, d4 is a check rule of an impedance fixed value when the generator type is a turbine and the stator impedance characteristic is configured as stable circle, d5 is a check rule of an impedance fixed value when the generator type is a turbine and the stator impedance characteristic is configured as stable circle, d6 is a check rule of a rotor low-voltage fixed value when the rotor voltage is configured as equal excitation voltage, d7 is a check rule of a rotor low-voltage fixed value when the generator type is a turbine and the rotor voltage is configured as variable excitation voltage, d8 is a check rule of a rotor excitation voltage coefficient fixed value when the generator type is a turbine and the rotor voltage is configured as variable excitation voltage,! A represents a reverse value, x represents a mathematical multiplication, and D1-D8 are checking rules used when checking the fixed value of the loss magnetic protection;
when the value calculated by the device characteristic variable in the matrix is 0, the check rule used when the fixed value of the loss magnetic protection executes check is 0, which indicates that the check rule does not participate in check;
and carrying out deviation degree judgment on the calculation result of the checking rule and the fixed value of the fixed value item of the loss magnetic protection, wherein the method comprises the following steps:
the fixed value checking objective function is expressed as:
M＝bool(B,C n ,D n )
wherein M is a check result return value of a single fixed value item of loss magnetic protection, B is equipment parameter and system equivalent quantification, C n Fixed value of single fixed value item for loss of magnetic protection, D n Checking rules for performing checking;
further comprises:
fixed value C according to single fixed value term of loss of magnetization protection n Identifying corresponding checking rules D for performing checking n ；
Extracting a check formula in the check rule, and converting the check formula into a digital calculation formula and formula variables which can be identified by a computer;
according to formula variable definition, intelligently matching corresponding generator equipment parameters and system equivalent ration B;
checking the formula, substituting the formula variable value, performing mathematical operation, and calculating a result value;
checking a formula calculated value and a single fixed value term fixed value C of loss of excitation protection n By comparison, when the loss of magnetic field protects a single constant value term constant value C n When the difference between the check result and the check calculation result is smaller than the preset deviation degree, the fixed value meets the check, and the check result return value M of the single fixed value item of the loss of the magnetic protection returns true;
when loss of magnetization protects single constant value item constant value C n When the difference between the check result and the check calculation result is not smaller than the preset deviation degree, the fixed value does not meet the check, and the check result return value M of the single fixed value item of the loss of magnetic protection returns false;
and carrying out fixed value check of loss magnetic protection according to the judgment result, wherein the method comprises the following steps:
the total check objective function of the loss of magnetic protection is expressed as:
H＝bool(M1,M2,……,Mn)
M1-Mn are check results of each fixed value item of the loss magnetic protection, and H is a total check result return value of the loss magnetic protection;
further comprises:
when each constant value item of the loss magnetic protection is checked to be met, the total check result of the loss magnetic protection is met, namely the values of M1-Mn are true;
if one of the values M1 to Mn is false, the total check result of the loss of magnetic field protection is a warning.
2. The utility model provides a power plant relates to net loss of magnet protection definite value check optimizing system which characterized in that includes:
the data acquisition module is used for acquiring the operation and equipment parameters of the generator protection device, wherein the operation and equipment parameters comprise a device characteristic variable value, a loss magnetic protection fixed value item and fixed value, generator equipment parameters and system equivalent quantification; the device characteristic variables are expressed as:
wherein A1 is a generator type, A2 is a system low-voltage input configuration, A3 is a stator impedance characteristic configuration, and A4 is a rotor voltage configuration;
the calculation module is used for automatically identifying the actual execution check rule of the generator protection device according to the operation and equipment parameters to obtain a check rule calculation result; each loss-of-magnetic protection constant value item has two checking rules, the corresponding relation with the device characteristic is realized by adopting the following matrix calculation process, and the matrix is expressed as follows:
wherein d1 is a check rule of a low-voltage fixed value when the system low voltage is configured as input, d2 is a check rule of a low-voltage fixed value when the system low voltage is configured as exit, d3 is a check rule of an impedance fixed value when the stator impedance characteristic is configured as asynchronous circle, d4 is a check rule of an impedance fixed value when the generator type is a turbine and the stator impedance characteristic is configured as stable circle, d5 is a check rule of an impedance fixed value when the generator type is a turbine and the stator impedance characteristic is configured as stable circle, d6 is a check rule of a rotor low-voltage fixed value when the rotor voltage is configured as equal excitation voltage, d7 is a check rule of a rotor low-voltage fixed value when the generator type is a turbine and the rotor voltage is configured as variable excitation voltage, d8 is a check rule of a rotor excitation voltage coefficient fixed value when the generator type is a turbine and the rotor voltage is configured as variable excitation voltage,! A represents a reverse value, x represents a mathematical multiplication, and D1-D8 are checking rules used when checking the fixed value of the loss magnetic protection;
when the value calculated by the device characteristic variable in the matrix is 0, the check rule used when the fixed value of the loss magnetic protection executes check is 0, which indicates that the check rule does not participate in check;
the judging module is used for judging the deviation degree of the check rule calculation result and the fixed value of the loss magnetic protection fixed value item, and comprises the following steps:
the fixed value checking objective function is expressed as:
M＝bool(B,C n ,D n )
wherein M is a check result return value of a single fixed value item of loss magnetic protection, B is equipment parameter and system equivalent quantification, C n Fixed value of single fixed value item for loss of magnetic protection, D n Checking rules for performing checking;
further comprises:
fixed value C according to single fixed value term of loss of magnetization protection n Identifying corresponding checking rules D for performing checking n ；
Extracting a check formula in the check rule, and converting the check formula into a digital calculation formula and formula variables which can be identified by a computer;
according to formula variable definition, intelligently matching corresponding generator equipment parameters and system equivalent ration B;
checking the formula, substituting the formula variable value, performing mathematical operation, and calculating a result value;
checking a formula calculated value and a single fixed value term fixed value C of loss of excitation protection n By comparison, when the loss of magnetic field protects a single constant value term constant value C n When the difference between the check result and the check calculation result is smaller than the preset deviation degree, the fixed value meets the check, and the check result return value M of the single fixed value item of the loss of the magnetic protection returns true;
when loss of magnetization protects single constant value item constant value C n When the difference between the check result and the check calculation result is not smaller than the preset deviation degree, the fixed value does not meet the check, and the check result return value M of the single fixed value item of the loss of magnetic protection returns false;
and carrying out fixed value check of loss magnetic protection according to the judgment result, wherein the method comprises the following steps:
the total check objective function of the loss of magnetic protection is expressed as:
H＝bool(M1,M2,……,Mn)
M1-Mn are check results of each fixed value item of the loss magnetic protection, and H is a total check result return value of the loss magnetic protection;
further comprises:
when each constant value item of the loss magnetic protection is checked to be met, the total check result of the loss magnetic protection is met, namely the values of M1-Mn are true;
if one of the values M1 to Mn is false, the total check result of the loss of magnetic field protection is a warning.
3. An electronic device, comprising:
a memory and a processor;
the memory is configured to store computer executable instructions, and the processor is configured to execute the computer executable instructions, where the computer executable instructions when executed by the processor implement the steps of the power plant network-related loss of magnetic protection fixed value check optimization method of claim 1.
4. A computer readable storage medium storing computer executable instructions which when executed by a processor implement the steps of the power plant loss of field protection setpoint checking optimization method of claim 1.
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