CN111309716A - Maintenance method and device applied to PAS case base and computer equipment - Google Patents
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Abstract
The embodiment of the invention relates to a maintenance method, a device and computer equipment applied to PAS case base, comprising the following steps: s1, acquiring the number of cases in a case base from an electric power dispatching automation system; s2, if the number of cases in the case base is not less than the threshold value for triggering case maintenance, S3 is executed; if the number of cases in the case base is less than the threshold for triggering case maintenance, executing S4; s3, maintaining the case base by adopting the isolated points to obtain a new case base; and S4, acquiring the number ratio m of the invalid cases in the case base, and executing S3 if the ratio m is larger than the invalid ratio limit value. According to the number of the obtained cases in the case base or the proportion of the obtained cases to the invalid cases, the condition for triggering case maintenance is achieved, useless cases such as errors or noises in the case base are removed in an isolated point mode, the number of the cases in the case base is reduced, the quality of the cases in the case base is improved, the case authenticity of the case base is ensured, and therefore the operation capacity and the efficiency of the power dispatching automation system are improved.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a maintenance method and device applied to a PAS case base and computer equipment.
Background
Ems (energy Management system) energy Management system has been developed so far, and has been developed from a stand-alone system to a network-based distributed multi-machine system, from the original only simple supervisory control and data acquisition (SCADA) development to power system advanced Application software pas (power Application software). PAS has become the important instrument that the operation mode analysis of supplementary dispatch operation personnel realization and accident preview. The practical application of PAS makes the dispatch change from empirical mode to analytic mode, has improved the safe and stable and economic operation level of electric wire netting.
At present, basic requirements and acceptance rules are provided for basic functions of a power grid dispatching automation system, and the examination of advanced application software (PAS) of the power dispatching automation system is realized by formulating quantitative indexes and carrying out error statistics on results and real-time measurement values (or state estimation values) after actual operation. However, the assessment method has some defects, and since the calculation results come from the PAS application, only extensive data comparison can be performed, and the performance of each aspect of software cannot be evaluated finely.
In the prior art, the accuracy of dispatcher load flow calculation of the auxiliary PAS is low, and particularly, along with the complication of an interconnected power grid, the calculation result of the existing dispatcher load flow module is larger than the actual result, and even the difference is several times. Meanwhile, the dispatcher trend module lacks principle analysis and long-term statistical tracking, and the defects of software functions and some recessive defects are difficult to find. And since PASs used by the power grid dispatching automation systems of all parts are produced from different manufacturers, a plurality of versions exist, software manufactured by different manufacturers has certain differences in the aspects of models, algorithms and data processing, different results can be obtained from the same data, and a unified case library is required to be established to examine the PASs.
The case base is a main knowledge base in the power dispatching automation system, and a learning function in the power dispatching automation system is to continuously add new cases to the case base. When the case base is continuously increased, the method has the advantages that the same case or similar cases can be easily found, and the correction times and time are reduced. Generally speaking, the larger the knowledge base, the richer the knowledge, so that the system can solve more problems and embody the intelligence level of the system. However, with the continuous expansion of the case base, the retrieval time of similar cases is greatly increased, and the retrieval time is longer and longer, so that the capability of the power dispatching automation system is influenced, the swamp problem occurs, and the capability and efficiency problems of the power dispatching automation system are caused. On the other hand, the power dispatching automation system needs to be improved continuously with the change of the environment, and the reason for complicating the maintenance of the power dispatching automation system is that the power dispatching automation system has many different knowledge, and each kind of knowledge (case knowledge, similarity knowledge, correction knowledge, index knowledge and the like) has an influence on the performance of the system, so that the knowledge needs to be maintained.
Therefore, in order to improve the capacity and efficiency of the power dispatching automation system, maintaining the case base of the power dispatching automation system becomes an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a maintenance method and device applied to a PAS case base and a computer device, which are used for solving the technical problem that the case base of the existing power dispatching automation system has no maintenance function, and the capability and the efficiency of the power dispatching automation system are influenced along with the increase of cases of a power grid.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a maintenance method applied to PAS case base comprises the following steps:
s1, acquiring the number of cases in a case base from an electric power dispatching automation system;
s2, judging whether the number of cases in the case base is not less than a threshold value for triggering case maintenance or not, and executing a step S3 if the number of cases in the case base is not less than the threshold value for triggering case maintenance; if not, executing step S4;
s3, maintaining the case base by adopting an isolated point to obtain a new case base;
and S4, acquiring the number ratio m of the invalid cases in the case base, judging whether the ratio m is greater than an invalid ratio limit value, and if so, executing the step S3.
Preferably, the step of establishing the new case base based on the isolated points comprises:
s31, acquiring a case set X in the case base, and setting a case field value Eps;
s32, calculating each case X in the case set XiAnd other cases X in the case set XqDistance dist (x) therebetweeni,xq) Obtaining the number of cases in all the case fields in the case set X according to a calculation formula of the number of cases;
s33, comparing the number of the cases in all the case fields in the case set X to obtain a case with the minimum number of cases in the field, deleting the case with the minimum number, and establishing a new case library X' by other cases;
step S34, judging whether the number of cases in the new case base X' is not less than a threshold value for triggering case maintenance, if so, executing the step S32 to the step S33 again; and if not, the new case base X' is the maintained case base.
Preferably, the calculation formula of the number of cases is as follows:
wherein X is a case set, XiFor the ith case in case set X,
is xiNumber of cases in neighborhood, dist (x)i,xq) For case xiWith any other case X in case set Xq(q ≠ i), Eps is the set case field value.
Preferably, if the occupation ratio m is smaller than the invalid occupation ratio limit value, the case base does not need to be maintained.
Preferably, the proportion m is the ratio of the number of invalid cases in the case base to the number of all cases in the case base;
and the invalid case is a case which does not influence the operation of the power dispatching automation system in the case base.
The embodiment of the invention also provides a maintenance device applied to the PAS case base, which comprises a case acquisition unit, a first judgment unit, a second judgment unit and an execution unit;
the case acquisition unit is used for acquiring the number of cases in the case base from the power dispatching automation system;
the first judging unit is used for judging whether the number of cases in the case base is not less than a threshold value for triggering case maintenance;
the second judging unit is used for acquiring the number proportion m of the invalid cases in the case base according to the result of the first judging unit that the number of the cases in the case base is smaller than the threshold value for triggering case maintenance, and judging whether the proportion m is larger than the limit value of the invalid proportion;
the execution unit is used for maintaining the case base by adopting an isolated point according to the result of the first judgment unit that the number of cases in the case base is not less than the threshold value for triggering case maintenance and the result of the second judgment unit that the occupation ratio m is greater than the invalid occupation ratio limit value, so as to obtain a new case base.
Preferably, the execution unit comprises an acquisition subunit, a calculation subunit, a comparison subunit and an execution subunit;
the obtaining subunit is configured to obtain a case set X in the case base, and set a case field value Eps;
the calculating subunit is used for calculating each case X in the case set XiAnd other cases X in the case set XqDistance dist (x) therebetweeni,xq) Obtaining the number of cases in all the case fields in the case set X according to a calculation formula of the number of cases;
the comparison subunit is used for comparing the number of cases in all the field of cases in the case set X to obtain the case with the minimum number of cases in the field, deleting the case with the minimum number, and establishing a new case library X' by other cases;
the execution subunit is configured to execute the new case base X 'again in the calculation subunit and the comparison subunit according to that the number of cases in the new case base X' is not less than the threshold value for triggering case maintenance, until the number of cases in the obtained new case base X 'is less than the threshold value for triggering case maintenance, and use the new case base X' as a maintained case base.
Preferably, the calculation formula of the number of cases is as follows:
wherein X is a case set, XiFor the ith case in case set X,
is xiNumber of cases in neighborhood, dist (x)i,xq) For case xiWith any other case X in case set Xq(q ≠ i), Eps is the set case field value.
Preferably, the proportion m is the ratio of the number of invalid cases in the case base to the number of all cases in the case base;
and the invalid case is a case which does not influence the operation of the power dispatching automation system in the case base.
The invention also provides computer equipment, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the maintenance method applied to the PAS case base according to the instructions in the program codes.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. the maintenance method applied to the PAS case base achieves the condition of triggering case maintenance according to the number of the obtained cases or the proportion of the obtained cases to the invalid cases, eliminates the invalid cases such as errors or noises in the case base in an isolated point mode, reduces the number of the cases in the case base, improves the quality of the cases in the case base, and ensures the case authenticity of the case base, thereby improving the operation capacity and the efficiency of the electric power dispatching automation system, solving the technical problems that the case base of the existing electric power dispatching automation system has no maintenance function, and the capacity and the efficiency of the electric power dispatching automation system are influenced along with the increase of cases of a power grid;
2. the maintenance device applied to the PAS case base judges that the case base reaches the condition of triggering case maintenance through the first judging unit and the second judging unit according to the number of cases of the case base acquired by the case acquiring unit or the ratio of invalid cases acquired by the second judging unit, and executes and removes useless cases such as errors or noises in the case base by the executing unit in an isolated point mode, so that the number of cases in the case base is reduced, the quality of the cases in the case base is improved, the case authenticity of the case base is ensured, and the operation capacity and the efficiency of the power dispatching automation system are improved. The technical problem that the case base of the existing power dispatching automation system has no maintenance function, and the capacity and efficiency of the power dispatching automation system are influenced along with the increase of cases of a power grid is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a maintenance method applied to a PAS case base according to an embodiment of the present invention.
Fig. 2 is a flowchart of steps of establishing a new case base by the maintenance method applied to the PAS case base according to the embodiment of the present invention.
Fig. 3 is a frame diagram of a maintenance device applied to PAS case base according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the power dispatching automation system, the case base is a main knowledge base in the power dispatching automation system, and the case base maintenance refers to the realization of updating some case base organization structures or contents, and is more and more important for the maintenance of the case base in order to improve the capacity and the efficiency of the power dispatching automation system. However, the case base is difficult to maintain, the main factors are that the number of the case bases is large and the case bases are unstructured or semi-structured, and the maintenance of the case base involves the addition and deletion of cases, the adjustment of the structure of the case base, the update of the case base, the indexing mechanism of the case base and the like. The maintenance of the case base mainly focuses on the research on the aspect of the indexing mechanism of the case base at present, namely how to guarantee the capability and efficiency of the whole power dispatching automation system when new cases are continuously added into the case base, namely the maintenance of the case base.
The maintenance strategy or framework of the case base relates to the following aspects: when to trigger a maintenance operation, how to determine the type of maintenance operation, how to perform the selected maintenance operation.
The embodiment of the application provides a maintenance method, a device and computer equipment applied to a PAS case library, and for the increase of cases of the case library, useless cases such as errors or noises in the case library are eliminated in an isolated point mode, the number of cases in the case library is reduced, the quality of the cases in the case library is improved, and the case authenticity of the case library is ensured, so that the operation capacity and the efficiency of an electric power dispatching automation system are improved, and the technical problem that the case library of the existing electric power dispatching automation system has no maintenance function and the capacity and the efficiency of the electric power dispatching automation system are influenced along with the increase of the cases of a power grid is solved.
The first embodiment is as follows:
fig. 1 is a flowchart illustrating steps of a maintenance method applied to a PAS case base according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a maintenance method applied to a PAS case library, including the following steps:
s1, acquiring the number of cases in a case base from an electric power dispatching automation system;
s2, judging whether the number of cases in the case base is not less than a threshold value for triggering case maintenance or not, and executing the step S3 if the number of cases in the case base is not less than the threshold value for triggering case maintenance; if not, go to step S4;
s3, maintaining the case base by adopting the isolated points to obtain a new case base;
and S4, acquiring the number ratio m of the invalid cases in the case base, judging whether the ratio m is greater than an invalid ratio limit value, and if so, executing the step S3.
In step S1 of the embodiment of the present invention, the number of cases in the case base is mainly obtained from the power dispatching automation system.
It should be noted that the automation of power system dispatching refers to a system design work of providing a system function planning and technical equipment configuration scheme for a power system dispatching automation system, and is a component of power system design; the design work is based on the development planning, the dispatching management system and the dispatching responsibility division, and starts from analyzing the characteristics, the operation requirements and the basic conditions of the power system. And providing a general scheme and implementation steps which are adaptive to the scheduling relation, accord with reliability, practicability and economy and are convenient for expansion and development.
In step S2 of the embodiment of the present invention, a threshold N for triggering case maintenance is first setsetAnd taking the number of cases in the case base as N, and judging whether N is not less than NsetAs a result, whether or not the case base is maintained for the first time.
It should be noted that the maintenance method applied to the PAS case base maintains the cases in the case base based on the condition that the number of the cases in the case base reaches the trigger and needs to be maintained; that is, the number of cases N in the case base is not less than the threshold N for triggering case maintenanceset。
In step S3 of the embodiment of the present invention, the case with the largest isolation point (i.e., the case with the smallest number of cases) is screened from the case library, the screened case is removed or deleted to maintain the case library, and the deleted or removed other cases form a new case library of the power scheduling automation system.
In step S4 of the embodiment of the present invention, the number N of cases in the case base is smaller than the threshold N for triggering case maintenancesetUnder the condition, acquiring the number ratio m of invalid cases in the case library, and judging whether the ratio m is larger than an invalid ratio limit value mset. Invalid ratio limit value msetTwo, a minimum invalid ratio limit value m is setsetminAnd a maximum invalid ratio limit value msetmax. In particular, if m is less than msetminThe case base does not need to be maintained; if m is not less than msetminAnd is greater than msetmaxThen maintenance of the case base is required.
In step S4, the number of invalid cases m is greater than the maximum invalid ratio limit value msetmaxStep S3 is executed to maintain the case base. If the number of invalid cases is less than the minimum invalid case limit value msetminAnd the case base does not need to be maintained.
The maintenance method applied to the PAS case base provided by the invention achieves the condition of triggering case maintenance according to the number of the acquired cases of the case base or the proportion of the acquired cases to the invalid cases, eliminates the useless cases such as errors or noises in the case base by adopting an isolated point mode, reduces the number of the cases in the case base, improves the quality of the cases in the case base, and ensures the authenticity of the cases in the case base, thereby improving the operation capability and the efficiency of the electric power dispatching automation system, and solving the technical problems that the case base of the existing electric power dispatching automation system has no maintenance function and influences the capability and the efficiency of the electric power dispatching automation system along with the increase of the cases of a power grid.
It should be noted that the maintenance operation of the case mainly includes adding or deleting the case in the case library.
Fig. 2 is a flowchart of steps of establishing a new case base by the maintenance method applied to the PAS case base according to the embodiment of the present invention.
As shown in fig. 2, in an embodiment of the present invention, the step of creating a new case base based on the isolated points includes:
s31, acquiring a case set X in a case base, and setting a case field value Eps;
s32, calculating each case X in the case set XiWith other cases X in case set XqDistance dist (x) therebetweeni,xq) Obtaining the number of cases in all the case fields in the case set X according to a calculation formula of the number of cases;
s33, comparing the number of cases in all the case fields in the case set X to obtain a case with the minimum number of cases in the fields, deleting the case with the minimum number, and establishing a new case library X' by other cases;
s34, judging whether the number of cases in the new case base X' is not less than a threshold value for triggering case maintenance, if so, executing the step S32 to the step S33 again; if not, the new case base X' is the maintained case base.
It should be noted that the case set X is a set of the number of cases in the case base, the distance between any one case in the case set X and other cases is calculated, the number of cases in each case field is calculated according to a calculation formula of the number of cases, the number of cases in each case field in the case set X is compared to obtain the case with the minimum number of cases, the case is deleted or eliminated to obtain a new case base X ', and if the number of cases in the new case base X' is not less than a threshold N for triggering case maintenancesetRepeatedly executing the steps S32 to S33 until the number of cases in the new case base X' is less than the threshold value N of the trigger case positionsetAnd the new case base X' under the condition is the maintained case base, and the maintenance of the case base is completed.
In an embodiment of the present invention, the calculation formula of the number of cases is:
wherein X is a case set, XiFor the ith case in case set X,
is xiNumber of cases in neighborhood, dist (x)i,xq) For case xiWith any other case X in case set Xq(q ≠ i), Eps is the set case field value.
In addition, let xjIs the maximum isolated point of the case base, which satisfies
Wherein xjIs the jth case in case set X.
In one embodiment of the invention, the ratio m is the ratio of the number of invalid cases in the case base to the number of all cases in the case base.
It should be noted that the invalid case is a case in the case base that does not affect the operation of the power dispatching automation system. The invalid case refers to a case that a given problem cannot be solved, such as state estimation, optimal control solution and the like.
Example two:
fig. 3 is a frame diagram of a maintenance device applied to PAS case base according to an embodiment of the present invention.
As shown in fig. 3, an embodiment of the present invention provides a maintenance apparatus applied to a PAS case base, including a case acquiring unit 10, a first judging unit 20, a second judging unit 30, and an executing unit 40;
the case acquiring unit 10 is used for acquiring the number of cases in a case base from the power dispatching automation system;
the first judging unit 20 is configured to judge whether the number of cases in the case base is not less than a threshold value for triggering case maintenance;
the second judging unit 30 is configured to obtain a ratio m of the number of invalid cases in the case base according to the result of the first judging unit 20 that the number of cases in the case base is smaller than the threshold value for triggering case maintenance, and judge whether the ratio m is larger than the limit value of the invalid ratio;
and the execution unit 40 is configured to maintain the case base by using the isolated point to obtain a new case base according to the result of the first determination unit 20 that the number of cases in the case base is not less than the threshold value for triggering case maintenance and according to the result of the second determination unit 30 that the ratio m is greater than the invalid ratio limit value.
In the case obtaining unit 10 according to the embodiment of the present invention, the number of cases in the case base is mainly obtained from the power dispatching automation system.
It should be noted that the automation of power system dispatching refers to a system design work of providing a system function planning and technical equipment configuration scheme for a power system dispatching automation system, and is a component of power system design; the design work is based on the development planning, the dispatching management system and the dispatching responsibility division, and starts from analyzing the characteristics, the operation requirements and the basic conditions of the power system. And providing a general scheme and implementation steps which are adaptive to the scheduling relation, accord with reliability, practicability and economy and are convenient for expansion and development.
In the first determining unit 20 of the embodiment of the present invention, first, a threshold N for triggering case maintenance is setsetAnd taking the number of cases in the case base as N, and judging whether N is not less than NsetAs a result, whether or not to maintain the case base for the first time.
It should be noted that the maintenance method applied to the PAS case base maintains the cases in the case base based on the condition that the number of the cases in the case base reaches the trigger and needs to be maintained; that is, the number of cases in the case libraryN is not less than threshold N for triggering case maintenanceset。
In the second judging unit 30 of the embodiment of the present invention, the case with the largest isolated point (i.e., the case with the smallest number of cases) is screened out from the case base, the screened-out cases are removed or deleted to maintain the case base, and the deleted or removed other cases form a new case base of the power dispatching automation system.
In the execution unit 40 of the embodiment of the present invention, the number N of cases in the case base is smaller than the threshold N for triggering the case maintenancesetUnder the condition, obtaining the number ratio m of invalid cases in the case base, and judging whether the ratio m is larger than the limit value m of the invalid ratioset. Invalid ratio limit value msetTwo, one minimum ineffective occupation ratio limit value msetminAnd a maximum invalid ratio limit value msetmax. In particular, if m is less than msetminThe case base does not need to be maintained; if m is not less than msetminAnd is greater than msetmaxThen maintenance of the case base is required.
It should be noted that, in the execution unit 40, the number ratio m of the invalid cases is greater than the maximum invalid ratio limit value msetmaxAnd maintaining the case base. If the number of invalid cases is less than the minimum invalid case limit value msetminAnd the case base does not need to be maintained.
In the embodiment of the present invention, the execution unit 40 includes an acquisition subunit 41, a calculation subunit 42, a comparison subunit 43, and an execution subunit 44;
an obtaining subunit 41, configured to obtain a case set X in the case base, and set a case field value Eps;
a computing subunit 42 for computing each case X in the case set XiWith other cases X in case set XqDistance dist (x) therebetweeni,xq) Obtaining the number of cases in all the case fields in the case set X according to a calculation formula of the number of cases;
a comparison subunit 43, configured to compare the number of cases in all the field of cases in the case set X to obtain a case with the minimum number of cases in the field, delete the case with the minimum number, and establish a new case library X' for other cases;
the executing subunit 44 is configured to execute the new case base X 'again in the calculating subunit 42 and the comparing subunit 43 according to that the number of cases in the new case base X' is not less than the threshold for triggering case maintenance, until the obtained number of cases in the new case base X 'is less than the threshold for triggering case maintenance, and use the new case base X' as the maintained case base.
It should be noted that the case set X is a set of the number of cases in the case base, the distance between any one case in the case set X and other cases is calculated, the number of cases in each case field is calculated according to a calculation formula of the number of cases, the number of cases in each case field in the case set X is compared to obtain the case with the minimum number of cases, the case is deleted or eliminated to obtain a new case base X ', and if the number of cases in the new case base X' is not less than a threshold N for triggering case maintenancesetThe execution according to the acquisition subunit 41, the calculation subunit 42 and the comparison subunit 43 continues until the number of cases of the new case base X' is smaller than the threshold N of the trigger case positionsetAnd the new case base X' under the condition is the maintained case base, and the maintenance of the case base is completed.
In the embodiment of the present invention, the calculation formula of the number of cases is:
wherein X is a case set, XiFor the ith case in case set X,
is xiNumber of cases in neighborhood, dist (x)i,xq) For case xiWith any other case X in case set Xq(q ≠ i), Eps is the set case field value.
In the embodiment of the invention, the ratio m is the ratio of the number of invalid cases in the case base to the number of all cases in the case base.
It should be noted that the invalid case is a case in the case base that does not affect the operation of the power dispatching automation system.
The maintenance device applied to the PAS case base provided by the invention judges the case base to reach the condition of triggering case maintenance through the first judgment unit and the second judgment unit according to the number of cases of the case base acquired by the case acquisition unit or the ratio of invalid cases acquired in the second judgment unit, and executes and eliminates useless cases such as errors or noises in the case base by adopting an isolated point mode through the execution unit, thereby reducing the number of cases in the case base, improving the quality of the cases in the case base, ensuring the case authenticity of the case base and further improving the operation capacity and efficiency of the power dispatching automation system. The technical problem that the case base of the existing power dispatching automation system has no maintenance function, and the capacity and the efficiency of the power dispatching automation system are influenced along with the increase of cases of a power grid is solved.
Example three:
the embodiment of the invention provides computer equipment, which comprises a processor and a memory;
a memory for storing the program code and transmitting the program code to the processor;
and the processor is used for executing the maintenance method applied to the PAS case base according to the instructions in the program codes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical functional division, and in actual implementation, there may be other divisions, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a hardware form, and can also be realized in a software functional unit form.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A maintenance method applied to PAS case base is characterized by comprising the following steps:
s1, acquiring the number of cases in a case base from an electric power dispatching automation system;
s2, judging whether the number of cases in the case base is not less than a threshold value for triggering case maintenance or not, and executing a step S3 if the number of cases in the case base is not less than the threshold value for triggering case maintenance; if not, go to step S4;
s3, maintaining the case base by adopting an isolated point to obtain a new case base;
and S4, acquiring the number ratio m of the invalid cases in the case base, judging whether the ratio m is greater than an invalid ratio limit value, and if so, executing the step S3.
2. The maintenance method applied to PAS case base as claimed in claim 1, wherein the step of establishing the new case base based on the isolated points comprises:
s31, acquiring a case set X in the case base, and setting a case field value Eps;
s32, calculating each case X in the case set XiAnd other cases X in the case set XqDistance dist (x) therebetweeni,xq) Obtaining the number of cases in all the case fields in the case set X according to a calculation formula of the number of cases;
s33, comparing the number of the cases in all the case fields in the case set X to obtain a case with the minimum number of cases in the fields, deleting the case with the minimum number, and establishing a new case library X' by other cases;
step S34, judging whether the number of cases in the new case base X' is not less than a threshold value for triggering case maintenance, if so, executing the step S32 to the step S33 again; and if not, the new case base X' is the maintained case base.
3. The maintenance method applied to PAS case base as claimed in claim 2, wherein the calculation formula of the number of cases is:
wherein X is a case set, XiFor the ith case in case set X,
is xiNumber of cases in neighborhood, dist (x)i,xq) For case xiWith any other case X in case set Xq(q ≠ i), Eps is the set case field value.
4. The maintenance method applied to PAS case base according to claim 1, wherein if said occupation ratio m is less than the invalid occupation ratio limit value, the case base is not required to be maintained.
5. The maintenance method applied to PAS case base as claimed in claim 1, wherein said m is the ratio of the number of invalid cases in the case base to the number of all cases in the case base;
and the invalid case is a case which does not influence the operation of the power dispatching automation system in the case base.
6. A maintenance device applied to PAS case base is characterized by comprising a case acquisition unit, a first judgment unit, a second judgment unit and an execution unit;
the case acquisition unit is used for acquiring the number of cases in the case base from the power dispatching automation system;
the first judging unit is used for judging whether the number of cases in the case base is not less than a threshold value for triggering case maintenance;
the second judging unit is used for acquiring the number proportion m of the invalid cases in the case base according to the result of the first judging unit that the number of the cases in the case base is smaller than the threshold value for triggering case maintenance, and judging whether the proportion m is larger than the limit value of the invalid proportion;
the execution unit is used for maintaining the case base by adopting an isolated point according to the result of the first judgment unit that the number of cases in the case base is not less than the threshold value for triggering case maintenance and the result of the second judgment unit that the ratio m is greater than the invalid ratio limit value, so as to obtain a new case base.
7. The maintenance device applied to PAS case base according to claim 6, wherein the execution unit comprises an acquisition subunit, a calculation subunit, a comparison subunit and an execution subunit;
the obtaining subunit is configured to obtain a case set X in the case base, and set a case field value Eps;
the calculating subunit is used for calculating each case X in the case set XiAnd other cases X in the case set XqDistance dist (x) therebetweeni,xq) Obtaining the number of cases in all the case fields in the case set X according to a calculation formula of the number of cases;
the comparison subunit is used for comparing the number of the cases in the field of all the cases in the case set X to obtain the case with the minimum number of the cases in the field, deleting the case with the minimum number, and establishing a new case library X' by other cases;
the execution subunit is configured to execute the new case base X 'again in the calculation subunit and the comparison subunit according to that the number of cases in the new case base X' is not less than the threshold value for triggering case maintenance, until the number of cases in the obtained new case base X 'is less than the threshold value for triggering case maintenance, and use the new case base X' as a maintained case base.
8. The maintenance device applied to PAS case base as claimed in claim 7, wherein the calculation formula of the number of cases is:
wherein X is a case set, XiFor the ith case in case set X,
is xiNumber of cases in neighborhood, dist (x)i,xq) For case xiWith any other case X in case set Xq(q ≠ i), Eps is the set case field value.
9. The maintenance device applied to PAS case base as claimed in claim 6, wherein said m is the ratio of the number of invalid cases in the case base to the number of all cases in the case base;
and the invalid case is a case which does not influence the operation of the power dispatching automation system in the case base.
10. A computer device comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the maintenance method applied to PAS case base in any claim 1-5 according to the instruction in the program code.
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