CN111934338B - Operation evaluation method and device for flexible direct-current power grid line protection - Google Patents
Operation evaluation method and device for flexible direct-current power grid line protection Download PDFInfo
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- CN111934338B CN111934338B CN202010729734.9A CN202010729734A CN111934338B CN 111934338 B CN111934338 B CN 111934338B CN 202010729734 A CN202010729734 A CN 202010729734A CN 111934338 B CN111934338 B CN 111934338B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention provides an operation evaluation method and device for flexible direct-current power grid line protection, wherein the method comprises the following steps: obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function; evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive rate and the actual positive rate of the line protection equipment; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment. The device is used for executing the method. The operation evaluation method and device for the line protection of the flexible direct current power grid, provided by the embodiment of the invention, improve the operation reliability of the flexible direct current power grid.
Description
Technical Field
The invention relates to the technical field of flexible direct-current power grids, in particular to a method and a device for evaluating the operation of the protection of a flexible direct-current power grid line.
Background
The new energy sources such as wind power, solar energy, tidal energy and the like have the characteristics of intermittency and randomness, the large-scale consumption of the new energy sources becomes a great practical problem facing Chinese power systems, and the traditional power equipment, power grid structure and operation technology are not satisfactory. The power transmission and distribution technology and the direct current technology of the power grid become research hotspots, and concepts such as a flexible direct current power grid and the like are generated at the same time.
The principle of line protection in the flexible direct current network system is completely different from that in the traditional alternating current system, and the ultra-high speed sampling rate and the ultra-fast action speed have extremely high specificity. The protection is rarely applied to domestic and foreign engineering, and the operation evaluation of the protection does not form a uniform standard. Conventional direct current engineering adopting overhead line power transmission is common at home and abroad, the engineering application is mature, but the fault characteristics of the conventional direct current line are obviously different from the fault characteristics of the flexible direct current transmission line, and the evaluation of the protection running state of the flexible direct current line cannot be directly applied to various evaluation technologies of the conventional direct current. For traditional relay protection and safety automatic devices with alternating current, a set of complete and mature running state evaluation system is formed in China, but due to the unique conditions of flexible and straight overhead lines, the running state evaluation system cannot perform complete evaluation on the running of flexible and straight line protection.
Therefore, how to provide an operation evaluation method for the protection of the flexible direct-current power grid line is an important problem to be solved in the field to realize the operation evaluation of the protection of the flexible direct-current power grid line.
Disclosure of Invention
Aiming at the problems in the prior art, the embodiment of the invention provides a method and a device for evaluating the operation of flexible direct-current power grid line protection.
On one hand, the invention provides an operation evaluation method for flexible direct-current power grid line protection, which comprises the following steps:
obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid;
obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment;
obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function;
evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive rate and the actual positive rate of the line protection equipment; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
In another aspect, the present invention provides an operation evaluation apparatus for protecting a flexible dc power grid line, including:
the first obtaining unit is used for obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid;
a second obtaining unit, configured to obtain an action ratio of each protection function according to the number of actions of each protection function and the total number of first actions of the line protection device; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment;
a third obtaining unit, configured to obtain a theoretical positive power of the line protection device according to the experimental positive power and the action ratio of each protection function;
the evaluation unit is used for evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive power rate and the actual positive power rate of the line protection equipment; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
In another aspect, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the operation evaluation method for protecting a flexible dc power grid line according to any of the above embodiments when executing the program.
In yet another aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for evaluating the operation of a flexible dc power grid line protection according to any of the embodiments described above.
According to the operation evaluation method and device for the line protection of the flexible direct-current power grid, provided by the embodiment of the invention, the experimental positive rate of each protection function is obtained according to the correct action times, the misoperation times and the action rejection times of each protection function, the action ratio of each protection function is obtained according to the action times of each protection function and the total first action times of the line protection equipment, the theoretical positive rate of the line protection equipment is obtained according to the experimental positive rate and the action ratio of each protection function, and the line protection condition of the flexible direct-current power grid is evaluated according to the theoretical positive rate and the actual positive rate of the line protection equipment.
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, 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 the drawings without creative efforts. In the drawings:
fig. 1 is a schematic flow chart of an operation evaluation method for protecting a flexible dc power grid line according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an operation evaluation device for flexible dc power grid line protection according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an operation evaluation device for protecting a flexible dc power grid line according to another embodiment of the present invention.
Fig. 4 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
In order to facilitate understanding of the technical solutions provided in the present application, the following first describes relevant contents of the technical solutions in the present application. The flexible direct-current power grid refers to a power grid formed by direct-current power transmission lines based on a flexible direct-current power transmission technology. The operation evaluation means evaluation as to whether or not the device has completed its design function well in actual operation.
And comparing the action result of the protection function with the recording file and the fault reproduction analysis result on the alternating current transmission line, analyzing by an expert system knowledge base, and judging whether the protection action acts correctly. And generating a protection action evaluation report according to the protection action judgment result, and counting the times of correct actions and incorrect actions of protection so as to calculate the correct action rate of the switch. And for the fault line, fault distance measurement is carried out through calculation of zero sequence current. However, for the flexible direct current power grid line, the number of samples is small, and a complete expert system knowledge base cannot be formed. The method has the advantages that the correct action and the incorrect action times of the protection are simply counted, the counted data amount is small, the operation evaluation cannot be carried out on the protection of the flexible direct-current power grid line in all aspects, and the operation evaluation method for the protection of the alternating-current power transmission line cannot be adopted because the flexible direct-current power grid line does not have zero-sequence current.
For each protection of the intelligent substation, in the prior art, based on an IEC61850 system, a system configuration file SSD and an SCD are used to describe a primary system and a secondary system of the intelligent substation, a static model is analyzed by using the SCD and the SSD description file, and a protection correct action information base is automatically generated. After the actual action information of the protection is collected through the GOOSE and MMS network, the actual action information is compared with the information base of the correct action of the protection to form an evaluation result. However, the flexible direct-current power grid line does not completely follow the IEC61850 system like an intelligent substation, and an SCD file and an SSD file are not formed, so that a protection correct action information base cannot be automatically generated according to a static model. The flexible direct-current power grid line protection system has the advantages of few protection samples, high action difference and difficult statistical analysis, and cannot acquire proper protection actual action information like an intelligent substation.
Fig. 1 is a schematic flowchart of an operation evaluation method for flexible dc power grid line protection according to an embodiment of the present invention, and as shown in fig. 1, the operation evaluation method for flexible dc power grid line protection according to the embodiment of the present invention includes:
s101, obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; the correct action times, the false action times and the action rejection times of each protection function are obtained by performing fault simulation experiments on line protection equipment of the flexible direct current power grid;
specifically, as the number of line protection samples for the flexible direct-current power grid is small, a mature flexible direct-current power grid simulation experiment platform can be used for performing fault simulation experiments on the line protection equipment of the flexible direct-current power grid, and the correct action times, the false action times and the failure action times of each protection function of the line protection equipment are obtained. The server can obtain the correct action times, the false action times and the action rejection times of each protection function of the line protection equipment, and then the experimental positive action rate of each protection function is obtained according to the correct action times, the false action times and the action rejection times of each protection function. The execution main body of the operation evaluation method for the line protection of the flexible direct current power grid provided by the embodiment of the invention comprises but is not limited to a server.
When fault simulation experiments are carried out on the line protection equipment on a flexible direct-current power grid simulation experiment platform, simulation experiments are respectively carried out aiming at each protection function of the line protection equipment, fault points are respectively arranged at different positions inside and outside a protection area of the line protection equipment, one protection function is excited every time, and the correct action times, the misoperation times and the failure action times of each protection function are counted. The fault occurs in the protection area, and the protection function acts, which is called as the correct action of the protection function; the fault occurs outside the protection area, and the protection function acts, namely the protection function malfunction; the failure occurs in the protected zone and the protection function does not act, referred to as protection function inaction.
For example, the server is based on a formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein, B i Is the correct action times of the ith protection function, T is the total second action times of the line protection equipment,
W i number of malfunctions of the i-th protection function, R i And the number of times of actions refused for the ith protection function is represented, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
S102, obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment;
specifically, a fault experiment is performed by using real line protection equipment, so that the number of times of actions of each protection function of the line protection equipment can be obtained, and the total number of times of first actions of the line protection equipment is obtained through statistics, wherein the total number of times of the first actions is the sum of the number of times of actions of each protection function of the line protection equipment. The server may obtain the number of actions of each protection function of the line protection device and the total number of first actions of the line protection device, and then calculate a ratio of the number of actions of each protection function to the total number of first actions, to obtain an action ratio of each protection function. When the failure occurs to cause the actions of various protection functions, the protection function which acts the fastest is counted once, and the protection functions which act again subsequently are not counted. It can be understood that the fault point set by the fault experiment performed by the real line protection device corresponds to the fault point set by the fault simulation experiment performed on the line protection device.
For example, the server is based on a formula
Calculating the action ratio P of the ith protection function i Wherein D is i Is the action number of the ith protection function, Q is the total number of the first actions,
i is a positive integer and is smaller than n, and n is the total number of protection functions of the line protection equipment.
S103, obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function;
specifically, after obtaining the experimental positive rate and the action ratio of each protection function of the line protection device, the server may obtain the theoretical positive rate of the line protection device according to the experimental positive rate and the action ratio of each protection function.
For example, the server calculates the sum of the products of the experimental positive rate of each protection function and the corresponding action ratio as the theoretical positive rate of the line protection device.
S104, evaluating the operation condition of the line protection of the flexible direct current power grid according to the theoretical positive power rate and the actual positive power rate of the line protection equipment; wherein the actual positive power ratio is obtained in advance.
Specifically, after obtaining the theoretical positive rate of the line protection device, the server compares the theoretical positive rate of the line protection device with the actual positive rate of the line protection device, and if the theoretical positive rate is equal to the actual positive rate, it indicates that the line protection device can well complete its design function in actual operation. And if the theoretical positive action rate is smaller than the actual positive action rate, indicating that the protection function has action refusal. And if the theoretical positive power ratio is larger than the actual positive power ratio, the protection function has false operation. And the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
For example, the actual protection operation condition of the line protection device within a preset time (for example, one year) is counted, that is, the actual protection action times of the line protection device are counted, the correctness of each protection action is analyzed one by one, the actual protection correct action times of the line protection device are obtained, and the actual positive action rate of the line protection device is calculated according to the following formula:
wherein Q is Z The actual positive action rate of the line protection equipment, X is the actual protection correct action times of the line protection equipment in the preset time, and Y is the actual positive action rateAnd the actual protection action times of the line protection equipment in the preset time.
According to the operation evaluation method for the line protection of the flexible direct-current power grid, provided by the embodiment of the invention, the experimental positive power of each protection function is obtained according to the correct action times, the misoperation times and the action rejection times of each protection function, the action ratio of each protection function is obtained according to the action times of each protection function and the total first action times of the line protection equipment, the theoretical positive power of the line protection equipment is obtained according to the experimental positive power and the action ratio of each protection function, and the line protection condition of the flexible direct-current power grid is evaluated according to the theoretical positive power and the actual positive power of the line protection equipment.
On the basis of the foregoing embodiments, further, the obtaining an experimental positive action rate of each protection function according to the number of correct actions, the number of false actions, and the number of times of false actions of each protection function includes:
according to the formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein, B i Is the correct action times of the ith protection function, T is the total second action times of the line protection equipment,
W i number of malfunctions of the i-th protection function, R i And the number of times of actions refused for the ith protection function is represented, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
Specifically, the server may obtain the number of correct actions, the number of false actions, and the number of times of refusal actions of each protection function of the line protection device according to a formula
Calculating to obtain the total times T of the second actions of the line protection equipment, and then obtaining the total times T of the second actions according to a formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein B is i And the number of correct actions of the ith protection function is, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
On the basis of the foregoing embodiments, further, the obtaining a theoretical positive power of the line protection device according to the experimental positive power and the operation ratio of each protection function includes:
according to the formula
Calculating to obtain the theoretical positive power ratio P of the line protection equipment z Wherein P is i Is the action ratio of the i-th protection function, Z i And the experimental positive power rate of the ith protection function is represented, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
Specifically, the server obtains the action ratio P of the ith protection function i I the experimental positive power Z of the protection function i Then, can be according to the formula
Calculating to obtain the theoretical positive power ratio P of the line protection equipment z Wherein i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
On the basis of the foregoing embodiments, further, the operation evaluation method for flexible dc power grid line protection provided in the embodiments of the present invention further includes:
according to the formula
Is calculated to obtain theAnd the protection action response rate S of the line protection equipment, wherein C is the protection action response times of the line protection equipment, and Q is the first action total times of the line protection equipment.
Specifically, the final purpose of the protection function action is to ensure the stability of the flexible dc power grid, and for some faults, such as a lightning strike line, a transient operation overvoltage, and the like, due to the rapidity and the sensitivity of the flexible dc line protection, the electrical quantity may meet the protection action condition in a short time, and the protection function acts correctly, but at this time, the protection function action is not favorable for the stability of the flexible dc power grid. Therefore, the protection action rate index is introduced in the embodiment of the invention and is used for describing the beneficial effect of the protection function action on the stability of the flexible direct-current power grid.
The server may be based on a formula
And calculating to obtain a protection action response rate S of the line protection equipment, wherein C is the protection action response times of the line protection equipment, and Q is the first action total times of the line protection equipment. The protection action times of the line protection equipment are obtained by statistics based on a protection function action analysis report after a real line protection equipment carries out a fault experiment, namely, whether actions of all protection functions are beneficial to the stability of the flexible direct-current power grid is manually analyzed, and if the actions are beneficial, the actions of the protection functions are taken as protection action. The larger the value of the protection action rate is, the more the action of the protection function of the line protection equipment is beneficial to the stability of the flexible direct-current power grid.
Fig. 2 is a schematic structural diagram of an operation evaluation apparatus for flexible dc power grid line protection according to an embodiment of the present invention, and as shown in fig. 2, the operation evaluation apparatus for flexible dc power grid line protection according to the embodiment of the present invention includes a first obtaining unit 201, a second obtaining unit 202, a third obtaining unit 203, and an evaluation unit 204, where:
the first obtaining unit 201 is configured to obtain an experimental positive operation rate of each protection function according to the number of correct actions, the number of false actions, and the number of times of false actions of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid; the second obtaining unit 202 is configured to obtain an action ratio of each protection function according to the number of actions of each protection function and the total number of first actions of the line protection device; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment; the third obtaining unit 203 is configured to obtain a theoretical positive power of the line protection device according to the experimental positive power and the action ratio of each protection function; the evaluation unit 204 is configured to evaluate an operation condition of the line protection of the flexible dc power grid according to a theoretical positive rate and an actual positive rate of the line protection device; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
Specifically, since the number of line protection samples for the flexible direct current power grid is small, a mature flexible direct current power grid simulation experiment platform can be used for performing fault simulation experiments on the line protection equipment of the flexible direct current power grid, and the correct action times, the false action times and the action refusal times of each protection function of the line protection equipment are obtained. The first obtaining unit 201 may obtain the number of correct actions, the number of false actions, and the number of times of actions rejected by each protection function of the line protection device, and then obtain the experimental positive action rate of each protection function according to the number of correct actions, the number of false actions, and the number of times of actions rejected by each protection function.
The method comprises the steps of carrying out fault experiments by using real line protection equipment, obtaining the action times of each protection function of the line protection equipment, and counting to obtain the total first action times of the line protection equipment, wherein the total first action times is the sum of the action times of each protection function of the line protection equipment. The second obtaining unit 202 may obtain the number of actions of each protection function of the line protection device and the total number of first actions of the line protection device, and then calculate a ratio of the number of actions of each protection function to the total number of first actions, so as to obtain an action ratio of each protection function. When the failure occurs to cause the actions of various protection functions, the protection function which acts the fastest is counted once, and the protection functions which act again subsequently are not counted. It can be understood that the fault point set by the fault experiment performed by the real line protection device corresponds to the fault point set by the fault simulation experiment performed on the line protection device.
After obtaining the experimental positive power and the action ratio of each protection function of the line protection device, the third obtaining unit 203 may obtain the theoretical positive power of the line protection device according to the experimental positive power and the action ratio of each protection function.
After obtaining the theoretical positive rate of the line protection device, the evaluation unit 204 compares the theoretical positive rate of the line protection device with the actual positive rate of the line protection device, and if the theoretical positive rate is equal to the actual positive rate, it indicates that the line protection device can well complete its design function in actual operation. And if the theoretical positive action rate is smaller than the actual positive action rate, indicating that the protection function has action refusal. And if the theoretical positive power ratio is larger than the actual positive power ratio, the protection function has false operation. Wherein the actual positive power ratio is obtained in advance.
According to the operation evaluation device for the line protection of the flexible direct-current power grid, provided by the embodiment of the invention, the experimental positive power rate of each protection function is obtained according to the correct action times, the misoperation times and the action rejection times of each protection function, the action ratio of each protection function is obtained according to the action times of each protection function and the total first action times of the line protection equipment, the theoretical positive power rate of the line protection equipment is obtained according to the experimental positive power rate and the action ratio of each protection function, the line protection condition of the flexible direct-current power grid is evaluated according to the theoretical positive power rate and the actual positive power rate of the line protection equipment, the operation condition of the line protection of the flexible direct-current power grid can be evaluated based on the theoretical positive power rate and the actual positive power rate, the operation evaluation of the line protection of the flexible direct-current power grid is realized, and the operation reliability of the flexible direct-current power grid is improved.
On the basis of the foregoing embodiments, further, the first obtaining unit 201 is specifically configured to:
according to the formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein, B i Is the correct action times of the ith protection function, T is the second total action times of the line protection equipment,
W i number of malfunctions of the i-th protection function, R i And the number of times of actions refused by the ith protection function is i, wherein i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
Specifically, the first obtaining unit 201 may obtain the number of correct actions, the number of false actions, and the number of times of operation rejections of each protection function of the line protection device according to a formula
Calculating to obtain the total times T of the second actions of the line protection equipment, and then obtaining the total times T of the second actions according to a formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein B is i And the number of correct actions of the ith protection function is, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
On the basis of the foregoing embodiments, further, the third obtaining unit 203 is specifically configured to:
according to the formula
Calculating to obtain the theoretical positive power ratio P of the line protection equipment z Wherein, P i Is the action ratio of the i-th protection function, Z i And the experimental positive power of the ith protection function is shown, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
Specifically, the third obtaining unit 203 obtains the action ratio P of the i-th protection function i I the experimental positive power Z of the protection function i Then, can be according to the formula
Calculating to obtain the theoretical positive power ratio P of the line protection equipment z Wherein i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
Fig. 3 is a schematic structural diagram of an operation evaluation device for flexible dc power grid line protection according to another embodiment of the present invention, and as shown in fig. 3, on the basis of the foregoing embodiments, further, the operation evaluation device for flexible dc power grid line protection according to the embodiment of the present invention further includes a calculation unit 205, where:
the calculation unit 205 is used for calculating the formula
And calculating to obtain a protection action response rate S of the line protection equipment, wherein C is the protection action response times of the line protection equipment, and Q is the first action total times of the line protection equipment.
In particular, the calculation unit 205 may be based on a formula
And calculating to obtain a protection action response rate S of the line protection equipment, wherein C is the protection action response times of the line protection equipment, and Q is the total first action times of the line protection equipment. The protection action times of the line protection equipment are obtained by counting protection function action analysis reports after fault experiments are carried out on the real line protection equipment, namely, whether actions of all protection functions have stability on the flexible direct-current power grid or not is manually analyzedAdvantageously, if beneficial, the action of the protection function is taken as the protection action. The larger the value of the protection action rate is, the more the action of the protection function of the line protection equipment is beneficial to the stability of the flexible direct-current power grid.
The embodiment of the apparatus provided in the embodiment of the present invention may be specifically configured to execute the processing flows of the foregoing method embodiments, and its functions are not described herein again, and reference may be made to the detailed description of the foregoing method embodiments.
Fig. 4 is a schematic physical structure diagram of an electronic device according to an embodiment of the present invention, and as shown in fig. 4, the electronic device may include: a processor (processor) 401, a communication Interface (Communications Interface) 402, a memory (memory) 403 and a communication bus 404, wherein the processor 401, the communication Interface 402 and the memory 403 communicate with each other through the communication bus 404. Processor 401 may call logic instructions in memory 403 to perform the following method: obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; the correct action times, the false action times and the action rejection times of each protection function are obtained by performing fault simulation experiments on line protection equipment of the flexible direct current power grid; obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment; obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function; evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive rate and the actual positive rate of the line protection equipment; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
In addition, the logic instructions in the memory 403 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units are sold or used as independent products. 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 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 or an optical disk, and other various media capable of storing program codes.
The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the method provided by the above-mentioned method embodiments, for example, comprising: obtaining the experimental positive action rate of each protection function according to the correct action times, the false action times and the action rejection times of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid; obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment; obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function; evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive rate and the actual positive rate of the line protection equipment; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
The present embodiment provides a computer-readable storage medium, which stores a computer program, where the computer program causes the computer to execute the method provided by the foregoing method embodiments, for example, the method includes: obtaining the experimental positive action rate of each protection function according to the correct action times, the false action times and the action rejection times of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid; obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment; obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function; evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive rate and the actual positive rate of the line protection equipment; and the actual positive power rate is obtained according to the actual protection operation condition statistics of the line protection equipment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In the description of the specification, reference to the description of "one embodiment," a specific embodiment, "" some embodiments, "" e.g., "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. An operation evaluation method for flexible direct-current power grid line protection is characterized by comprising the following steps:
obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid;
obtaining the action ratio of each protection function according to the action times of each protection function and the total first action times of the line protection equipment; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment;
obtaining the theoretical positive power of the line protection equipment according to the experimental positive power and the action ratio of each protection function;
evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive rate and the actual positive rate of the line protection equipment; the actual positive power rate is obtained according to the actual protection running condition statistics of the line protection equipment;
wherein, the obtaining the experimental positive action rate of each protection function according to the correct action times, the false action times and the action refusal times of each protection function comprises:
according to the formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein, B i Is the correct action times of the ith protection function, T is the total second action times of the line protection equipment,
W i number of false actions of the i-th protection function, R i The number of times of actions rejected for the ith protection function;
wherein the obtaining of the theoretical positive power of the line protection device according to the experimental positive power and the action ratio of each protection function includes:
according to the formula
Calculating to obtain the theoretical positive power ratio P of the line protection equipment z Wherein P is i Is the action ratio of the i-th protection function, Z i And the experimental positive power rate of the ith protection function is represented, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
2. The method of claim 1, further comprising:
according to the formula
And calculating to obtain a protection action response rate S of the line protection equipment, wherein C is the protection action response times of the line protection equipment, and Q is the total first action times of the line protection equipment.
3. An operation evaluation device for flexible direct-current power grid line protection is characterized by comprising:
the first obtaining unit is used for obtaining the experimental positive action rate of each protection function according to the correct action times, the misoperation times and the action rejection times of each protection function; the correct action times, the false action times and the action refusal times of each protection function are obtained by carrying out fault simulation experiments on line protection equipment of the flexible direct current power grid;
a second obtaining unit, configured to obtain an action ratio of each protection function according to the action number of each protection function and the total number of first actions of the line protection device; the action times of each protection function and the total first action times of the line protection equipment are obtained by performing fault experiments on the line protection equipment;
a third obtaining unit, configured to obtain a theoretical positive power of the line protection device according to the experimental positive power and the action ratio of each protection function;
the evaluation unit is used for evaluating the operation condition of the line protection of the flexible direct-current power grid according to the theoretical positive power rate and the actual positive power rate of the line protection equipment; the actual positive power rate is obtained according to the actual protection running condition statistics of the line protection equipment;
wherein the first obtaining unit is specifically configured to:
according to the formula
Calculating to obtain the experimental positive power Z of the ith protection function i Wherein B is i Is the correct action times of the ith protection function, T is the total second action times of the line protection equipment,
W i number of false actions of the i-th protection function, R i The number of times of actions rejected for the ith protection function;
wherein the third obtaining unit is specifically configured to:
according to the formula
Calculating to obtain the theoretical positive power ratio P of the line protection equipment z Wherein, P i Is the action ratio of the i-th protection function, Z i And the experimental positive power of the ith protection function is shown, i is a positive integer and is smaller than n, and n is the total number of the protection functions of the line protection equipment.
4. The apparatus of claim 3, further comprising:
a calculation unit for calculating according to a formula
And calculating to obtain a protection action response rate S of the line protection equipment, wherein C is the protection action response times of the line protection equipment, and Q is the first action total times of the line protection equipment.
5. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of claim 1 or 2 are implemented when the computer program is executed by the processor.
6. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of claim 1 or 2.
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