CN110601208B - Accurate load control method and system based on multidimensional load attribute - Google Patents
Accurate load control method and system based on multidimensional load attribute Download PDFInfo
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- CN110601208B CN110601208B CN201910862694.2A CN201910862694A CN110601208B CN 110601208 B CN110601208 B CN 110601208B CN 201910862694 A CN201910862694 A CN 201910862694A CN 110601208 B CN110601208 B CN 110601208B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention provides a precision load control method based on multidimensional load attribute, which comprises the steps of determining an evaluation index and giving corresponding weight values; obtaining the score of each evaluation index, calculating the comprehensive score of the load controlled by the load control terminal according to the weight value of each evaluation index, and obtaining the priority cutting order of the load; obtaining the theoretical total amount of the switchable loads of the stability control substation, and obtaining the priority cutting order of each negative control terminal in the same stability control substation according to the comprehensive score of the loads; and acquiring the total quantity of the cut-off loads of the stable control master station during the main network interconnecting link or the extra-high voltage direct current fault, distributing the total quantity of the cut-off loads to corresponding stable control substations, and cutting off the loads controlled by all the load control terminals with the actual cut-off loads not being 0 according to the priority cutting-off sequences of all the load control terminals and the loads controlled by the load control terminals in the same stable control substation. The invention can solve the problems of overlarge granularity of basic load shedding units and easy generation of a large number of overstocks in the prior art, improves the load shedding precision and provides guarantee for the safe operation of the power grid.
Description
Technical Field
The invention relates to the technical field of power load control, in particular to an accurate load control method and system based on multidimensional load attributes.
Background
The safety and stability control system (hereinafter referred to as stability control system) is a system formed by connecting safety and stability control devices (hereinafter referred to as stability control devices) of two or more stations through communication equipment, realizes the stability control of an electric power system in a region or a larger range, and adopts measures such as cutting machine, load cutting and the like to ensure the safe and stable operation of the electric power system.
When the receiving end power grid fails, the stability control device mainly maintains the stability of the power grid through control measures of concentrated load cutting or scattered load reduction. When the extra-high voltage direct current is blocked or other serious faults occur, if the power grid frequency or the bus voltage of the junction station falls below a preset safety value, the power system enters an emergency state. The unbalanced power in the power system is reduced through millisecond-level or second-level load control, and the rapid drop of the system frequency under the condition of large-scale power shortage can be effectively restrained.
For emergency load shedding control under power grid faults, when 110kV outgoing lines are directly cut off by the action of a conventional stable control system, a large number of overstocks are easily caused due to overlarge granularity of basic load shedding units, and if 110kV stations are directly cut off, a large number of users possibly have power failure, important users cannot be avoided being cut off, so that the problems of high control cost, low user acceptance and the like are solved.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the accurate load control method and the accurate load control system based on the multidimensional load attribute, which can overcome the problems that the granularity of basic load shedding units is too large and a large amount of load shedding is easy to cause in the prior art, improve the load shedding precision and provide guarantee for the safe operation of a power grid.
In order to solve the technical problems, the embodiment of the invention provides an accurate load control method based on multidimensional load attributes, which is used for a three-level tree network formed by a stable control main station, a plurality of stable control sub-stations and a plurality of negative control terminals; each stability control substation is connected with the stability control main station, and each stability control substation is correspondingly connected with a plurality of negative control terminals; the method comprises the following steps:
determining a common dimension attribute of the load controlled by each load control terminal, taking the obtained common dimension attribute as an evaluation index, and further giving a corresponding weight value to each evaluation index;
obtaining the score of each evaluation index of the load controlled by each negative control terminal, giving a corresponding weight value according to each evaluation index and the obtained score of each evaluation index of the load controlled by each negative control terminal, calculating the comprehensive score of the load controlled by each negative control terminal, and further obtaining the priority cutting order of the load controlled by each negative control terminal according to the calculated comprehensive score of the load controlled by each negative control terminal;
Summarizing the tangential load quantity of each negative control terminal in each stable control substation to obtain the tangential load theoretical total quantity of each stable control substation, and obtaining the priority cutting order of each negative control terminal in the same stable control substation according to the calculated comprehensive score of the load controlled by each negative control terminal;
the method comprises the steps of obtaining the total cut-off load of a main network interconnection line or an extra-high voltage direct current fault, distributing the total cut-off load of the main control station to corresponding stability control substations according to a preset cut-off weight value of each stability control substation and the obtained total cut-off load theoretical amount of each stability control substation, obtaining the actual cut-off load of each stability control substation and the actual cut-off load of each corresponding connected negative control terminal, and further cutting off the load controlled by each negative control terminal in sequence according to the obtained priority cutting-off sequence of each negative control terminal in the same stability control substation and the priority cutting-off sequence of the load controlled by each negative control terminal, wherein the actual cut-off load of each stability control substation is not 0.
Wherein the common dimension attributes include outage loss, the power sector to which it belongs, sensitivity, and electrical distance.
The priority cutting order of the loads controlled by each negative control terminal is obtained by arranging the comprehensive scores of the loads controlled by the same negative control terminal from large to small.
The priority cutting order of the negative control terminals in the same stable control substation is obtained by adding and averaging the comprehensive scores of the loads controlled by the negative control terminals in the same stable control substation and then arranging the average values from large to small.
The method comprises the specific steps of obtaining the total cut load of a main network interconnection line or an extra-high voltage direct current fault, distributing the total cut load of the main network to corresponding stable control substations according to a preset cut weight value of each stable control substation and the obtained total cut load theoretical amount of each stable control substation, obtaining the actual cut load total amount of each stable control substation and the actual cut load amount of each corresponding connected load terminal, and further cutting the load controlled by each load terminal in sequence according to the obtained priority cutting order of each load terminal in the same stable control substation and the priority cutting order of the load controlled by each load terminal, wherein the actual cut load total amount of each stable control substation is not 0, and the specific steps of cutting the load controlled by each load terminal in which the actual cut load amount of each stable control substation is not 0 comprise the following steps:
Acquiring the total cut-off load of the stability control master station when a main network interconnecting line or an extra-high voltage direct current fault occurs, and determining the distribution sequence of the total cut-off load of the stability control master station according to the preset cut-off weight value of each stability control substation;
in the allocation sequence, determining the first k+1 stability control substations for the total tangential load allocation of the stability control master station; the sum of the theoretical total tangential loads of the first k stability control substations in the distribution sequence is smaller than the total tangential load of the stability control master station; the sum of the theoretical total tangential loads of the k+1 stability control substations in the distribution sequence is greater than or equal to the total tangential load of the stability control master station; k is a positive integer;
setting the theoretical total amount of the cut-off loads of the k front stable control substations in the distribution sequence as the actual total amount of the cut-off loads of the same, setting the difference value of the sum of the total amount of the cut-off loads of the stable control master station and the theoretical total amount of the cut-off loads of the k front stable control substations in the distribution sequence as the actual total amount of the cut-off loads of the k+1th stable control substations in the distribution sequence, and setting 0 as the actual total amount of the cut-off loads of the k+1th stable control substations in the distribution sequence;
Sequentially and gradually advancing the loads controlled by all the negative control terminals in all the stable control substations layer by layer to form an initial load cutting set according to the distribution sequence, the obtained priority cutting sequence of all the negative control terminals in all the stable control substations and the priority cutting sequence of the loads controlled by all the negative control terminals;
the method comprises the steps of obtaining a priority cutting order of each negative control terminal in a k+1th stable control substation in the allocation order, determining a first m+1th negative control terminal used for total distribution of the actual total amount of the cuttable load of the k+1th stable control substation in the priority cutting order of each negative control terminal in the k+1th stable control substation, determining a first n+1th load to be cut in the m+1th negative control terminal according to the priority cutting order of the load controlled by the m+1th negative control terminal; wherein, the sum of the tangential load amounts of the first m load control terminals in the priority cutting sequence of the k+1th stable control substation is smaller than the actual total tangential load amount of the k+1th stable control substation; the sum of the tangential load amounts of the first m+1 load control terminals in the priority cutting sequence of the k+1 stable control sub-station is more than or equal to the actual total tangential load amount of the k+1 stable control sub-station; the sum of the load amounts of the first n loads in the priority cutting sequence of the loads controlled by the m+1th negative control terminal in the k+1th stable control substation is smaller than the total load amount distributed by the m+1th negative control terminal in the k+1th stable control substation; the sum of the load amounts of the first n+1 loads in the priority cutting sequence of the loads controlled by the m+1 negative control terminals in the k+1 stable control sub-station is larger than or equal to the total load amount distributed by the m+1 negative control terminals in the k+1 stable control sub-station; m and n are positive integers;
In the initial load cutting set, deleting the load controlled by each negative control terminal in the stable control sub-station with the actual total amount of all the cut loads being 0, further deleting the load controlled by the negative control terminal after the m+1th load is controlled by the priority cutting sequence of each negative control terminal in the k+1th stable control sub-station, deleting the load after the n+1th load is controlled by the m+1th load control terminal in the k+1th stable control sub-station, and updating to obtain a final load cutting set;
and according to the obtained final load cutting set, sequentially cutting off the loads in the obtained final load cutting set.
The embodiment of the invention also provides an accurate load control system based on the multidimensional load attribute, which is used for a three-level tree network formed by a stable control main station, a plurality of stable control sub-stations and a plurality of negative control terminals; each stability control substation is connected with the stability control main station, and each stability control substation is also correspondingly connected with a plurality of negative control terminals respectively, and the method comprises the following steps:
the assignment unit is used for determining the common dimension attribute of the load controlled by each negative control terminal, taking the obtained common dimension attribute as an evaluation index, and further assigning a corresponding weight value to each evaluation index;
The load priority cutting order acquisition unit is used for acquiring the scores of the evaluation indexes of the loads controlled by each negative control terminal, giving corresponding weight values according to the evaluation indexes and the acquired scores of the evaluation indexes of the loads controlled by each negative control terminal, calculating the comprehensive score of the loads controlled by each negative control terminal, and further obtaining the priority cutting order of the loads controlled by each negative control terminal according to the calculated comprehensive score of the loads controlled by each negative control terminal;
the load control terminal priority cutting order acquisition unit is used for summarizing the tangential load quantity of each load control terminal in each stability control substation to obtain the tangential load theoretical total quantity of each stability control substation, and obtaining the priority cutting order of each load control terminal in the same stability control substation according to the calculated comprehensive score of the load controlled by each load control terminal;
the load accurate cutting unit is used for obtaining the total cut load of the stable control main station when a main network interconnecting line or an extra-high voltage direct current fault occurs, distributing the total cut load of the stable control main station to the corresponding stable control sub station according to a preset cutting weight value of each stable control sub station and the obtained total cut load theoretical total cut load of each stable control sub station, obtaining the actual cut load total cut load of each stable control sub station and the actual cut load quantity of each corresponding connected load terminal, and further cutting the load controlled by each load terminal of which the actual cut load total cut load is not 0 in each stable control sub station according to the obtained priority cutting order of each load terminal in the same stable control sub station and the priority cutting order of the load controlled by each load terminal.
Wherein the common dimension attributes include outage loss, the power sector to which it belongs, sensitivity, and electrical distance.
The priority cutting order of the loads controlled by each negative control terminal is obtained by arranging the comprehensive scores of the loads controlled by the same negative control terminal from large to small.
The priority cutting order of the negative control terminals in the same stable control substation is obtained by adding and averaging the comprehensive scores of the loads controlled by the negative control terminals in the same stable control substation and then arranging the average values from large to small.
Wherein, the accurate excision of load unit includes:
the master station load distribution sequence acquisition module is used for acquiring the total cut-off load of the stability control master station when a main network tie line or an extra-high voltage direct current fault occurs, and determining the distribution sequence of the total cut-off load of the stability control master station according to the preset cut-off weight value of each stability control substation;
the substation screening module is used for determining the first k+1 stability control substations for the total cut load distribution of the stability control master station in the distribution sequence; the sum of the theoretical total tangential loads of the first k stability control substations in the distribution sequence is smaller than the total tangential load of the stability control master station; the sum of the theoretical total tangential loads of the k+1 stability control substations in the distribution sequence is greater than or equal to the total tangential load of the stability control master station; k is a positive integer;
The substation load acquisition module is used for setting the theoretical total of the cleavable loads of the k front stable control substations in the distribution sequence as the actual total of the respective cleavable loads, setting the difference value of the sum of the total of the cleavable loads of the stable control master station and the theoretical total of the cleavable loads of the k front stable control substations in the distribution sequence as the actual total of the cleavable loads of the k+1th stable control substations in the distribution sequence, and setting 0 as the actual total of the cleavable loads of the stable control substations after the k+1th stable control substations in the distribution sequence;
the load cut-off set initial module is used for sequentially and gradually advancing the loads controlled by all the negative control terminals in all the stable control substations layer by layer to form an initial load cut-off set according to the distribution sequence, the obtained priority cut-off sequence of all the negative control terminals in all the stable control substations and the priority cut-off sequence of the loads controlled by all the negative control terminals;
the load precision determining module is used for acquiring the priority cutting order of each negative control terminal in the k+1th stable control substation in the allocation order, determining the first m+1th negative control terminal used for completely allocating the actual total quantity of the cut loads of the k+1th stable control substation in the priority cutting order of each negative control terminal in the k+1th stable control substation, and further determining the first n+1th load to be cut in the m+1th negative control terminal according to the priority cutting order of the loads controlled by the m+1th negative control terminal; wherein, the sum of the tangential load amounts of the first m load control terminals in the priority cutting sequence of the k+1th stable control substation is smaller than the actual total tangential load amount of the k+1th stable control substation; the sum of the tangential load amounts of the first m+1 load control terminals in the priority cutting sequence of the k+1 stable control sub-station is more than or equal to the actual total tangential load amount of the k+1 stable control sub-station; the sum of the load amounts of the first n loads in the priority cutting sequence of the loads controlled by the m+1th negative control terminal in the k+1th stable control substation is smaller than the total load amount distributed by the m+1th negative control terminal in the k+1th stable control substation; the sum of the load amounts of the first n+1 loads in the priority cutting sequence of the loads controlled by the m+1 negative control terminals in the k+1 stable control sub-station is larger than or equal to the total load amount distributed by the m+1 negative control terminals in the k+1 stable control sub-station; m and n are positive integers;
The load cutting set final module is used for deleting the load controlled by each negative control terminal in the stable control sub-station with the actual total amount of the cut load of 0 in the initial load cutting set, further deleting the load controlled by the negative control terminal after the m+1th load controlled by the priority cutting sequence of each negative control terminal in the k+1th stable control sub-station, deleting the load after the n+1th load controlled by the m+1th load controlled by the negative control terminal in the k+1th stable control sub-station, and updating to obtain the final load cutting set;
and the accurate load removal module is used for sequentially removing the loads in the obtained final load removal set according to the obtained final load removal set.
The embodiment of the invention has the following beneficial effects:
according to the invention, large-scale interruptible loads in the power grid are cut off in a layered mode according to an importance level priority principle, when the last layer of load meeting the total required cut-off amount is cut off, the loads are sequentially cut off according to the priority order of the load control terminal until the total cut-off amount is met, the maximum error is the interruptible load amount on a shunt switch of a user, the problem that a large amount of overstock is easily caused due to overlarge granularity of a basic load cutting unit in the prior art can be solved, the load cutting precision is improved, layered and graded accurate load control is realized, and the safety operation of the power grid is ensured.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
FIG. 1 is a flowchart of a precise load control method based on multidimensional load attribute according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a topology structure of a three-level tree network in a precise load control method based on multidimensional load attributes according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an accurate load control system based on multidimensional load attribute according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, in the embodiment of the present invention, an accurate load control method based on multidimensional load attribute is provided, which is used on a three-level tree network (as shown in fig. 2) formed by a stable control master station, a plurality of stable control substations and a plurality of negative control terminals; each stability control substation is connected with a stability control main station, and each stability control substation is also correspondingly connected with a plurality of negative control terminals; the method comprises the following steps:
Step S1, determining a common dimension attribute of a load controlled by each negative control terminal, taking the obtained common dimension attribute as an evaluation index, and further giving a corresponding weight value to each evaluation index;
the specific process is that the common dimension attribute is determined to comprise the dimension attribute such as interruption loss, the power utilization department, sensitivity, electric distance and the like, and is used as an evaluation index, and a weight value is allocated to each evaluation index.
In one embodiment, the various evaluation metrics and assigned weight values for each load are determined as shown in table 1 below.
TABLE 1
| Sequence number | Load evaluation index (i) | Weight (Ri) |
| 1 | Interrupt loss | 0.6 |
| 2 | Electricity utilization department | 0.2 |
| 3 | Sensitivity of | 0.1 |
| 4 | Electric distance | 0.1 |
S2, obtaining the score of each evaluation index of the load controlled by each negative control terminal, giving a corresponding weight value according to each evaluation index and the obtained score of each evaluation index of the load controlled by each negative control terminal, calculating the comprehensive score of the load controlled by each negative control terminal, and further obtaining the priority cutting order of the load controlled by each negative control terminal according to the calculated comprehensive score of the load controlled by each negative control terminal;
firstly, obtaining the score of each evaluation index of the load controlled by each negative control terminal, wherein the score can be automatically calculated by a system or saved in a computer after being scored by an expert; secondly, multiplying each evaluation index score of the load by the weight of each evaluation index score to obtain a weighted comprehensive score of each load; and finally, ordering the same load control terminal according to the scores of the loads, thereby determining the level constant value of the loads connected with each terminal, namely, the priority cutting order of the loads controlled by each load control terminal is obtained by arranging the comprehensive scores of the loads controlled in the same load control terminal from large to small.
In one embodiment, the composite score for the load controlled by the load control terminal is shown in Table 2 below.
TABLE 2
| Load evaluation index | Load 1 | Load 2 | Load n |
| Interrupt loss | X 11 | X 12 | X 1n |
| Electricity utilization department | X 21 | X 22 | X 2n |
| Sensitivity of | X 31 | X 32 | X 3n |
| Electric distance | X 41 | X 42 | X 4n |
| Comprehensive score | X 1 | X 2 | X n |
The weighted comprehensive score calculation formula is shown in formula (1):
wherein X is n For the nth loadIs a composite score of (2); r is R i The weight value of the ith evaluation index; x is X in The score of the i index for the nth load.
Step S3, summarizing the tangential load quantity of each negative control terminal in each stable control substation to obtain the tangential load theoretical total quantity of each stable control substation, and obtaining the preferential cutting order of each negative control terminal in the same stable control substation according to the calculated comprehensive score of the load controlled by each negative control terminal;
the method comprises the steps of summarizing the tangential load quantity of each negative control terminal in each stable control substation to obtain the theoretical total tangential load quantity of each stable control substation and serve as the basis for subsequent distribution, setting the priority cutting order of each negative control terminal in the same stable control substation, namely adding the comprehensive scores of the loads controlled by each negative control terminal in the same stable control substation, averaging, and arranging according to the sequence from large to small.
The average value calculation formula of each negative control terminal is shown in formula (2):
Wherein Y is m The average value of all the load comprehensive scores of the mth negative control terminal.
And S4, acquiring the total cut-off load of the stable control main station in the event of a main network interconnection line or an extra-high voltage direct current fault, distributing the total cut-off load of the stable control main station to the corresponding stable control sub-station according to a preset cut-off weight value of each stable control sub-station and the obtained total cut-off load theoretical amount of each stable control sub-station, obtaining the actual cut-off load of each stable control sub-station and the actual cut-off load of each corresponding connected load control terminal, and further cutting off the load controlled by each load control terminal of which the actual cut-off load is not 0 in each stable control sub-station according to the obtained priority cut-off sequence of each load control terminal in the same stable control sub-station and the priority cut-off sequence of the load controlled by each load control terminal.
Firstly, acquiring the total cut-off load of a stability control master station in the case of a main network interconnecting line or an extra-high voltage direct current fault, and determining the distribution sequence of the total cut-off load of the stability control master station according to a preset cut-off weight value of each stability control substation (namely determining the priority of the substation); e.g. according to the order of the cutting weight values of the stability control substations from big to small;
Secondly, in the distribution sequence, the first k+1 stability control substations for distributing the total amount of the cut load of the stability control master station are determined; the sum of the theoretical total tangential loads of the first k stability control substations in the distribution sequence is smaller than the total tangential load of the stability control master station; the sum of the theoretical total tangential load amounts of the k+1 stability control substations in the distribution sequence is greater than or equal to the total tangential load amount of the stability control master station; k is a positive integer; it can be understood that the total tangential load of the stable control master station= (the sum of the theoretical total tangential load of the 1-k stable control substations, the sum of the theoretical total tangential load of the 1-k+1 stable control substations);
setting the theoretical total amount of the cut loads of the k front stable control substations in the distribution sequence as the actual total amount of the cut loads of each, setting the difference value of the sum of the total amount of the cut loads of the stable control master station and the theoretical total amount of the cut loads of the k front stable control substations in the distribution sequence as the actual total amount of the cut loads of the k+1th stable control substations in the distribution sequence, and setting 0 as the actual total amount of the cut loads of the k+1th stable control substations in the distribution sequence; it can be understood that the value obtained by subtracting the sum of the total tangential load amounts of the stability control master station and the theoretical tangential load amounts of the 1-k stability control substations is given to the k+1th stability control substation in the distribution sequence as the actual tangential load amount, and the actual tangential load amounts of the following k+2th, k+3rd, … … th and other stability control substations in the distribution sequence are all 0;
Thirdly, sequentially and gradually advancing the loads controlled by all the negative control terminals in all the stable control substations layer by layer to form an initial load cutting set according to the distribution sequence, the obtained priority cutting sequence of all the negative control terminals in all the stable control substations and the priority cutting sequence of the loads controlled by all the negative control terminals; for example, in one embodiment, the allocation order corresponds to the stability control substations A1, A2, …, A5; the stability control substation A1 corresponds to the negative control terminals B11 and B12; the stability control substation A2 corresponds to the negative control terminals B21, B22 and B23; the corresponding negative control terminal of the stability control substation A3 is B31; the stability control substation A4 corresponds to the negative control terminals B41, B42, B43 and B44; the stability control substation A5 corresponds to the negative control terminals B51 and B52; the resulting initial load cut set= { B11, B12; b21, B22, B23; b31; b41, B42, B43, B44; b51, B52};
then, the priority cutting order of each negative control terminal in the k+1th stable control substation is obtained, in the priority cutting order of each negative control terminal in the k+1th stable control substation, the first m+1th negative control terminal used for the total distribution of the actual total quantity of the cutting loads of the k+1th stable control substation is determined, according to the priority cutting order of the loads controlled by the m+1th negative control terminal, the first n+1th load to be cut in the m+1th negative control terminal is further determined; wherein the sum of the addition of the tangential load amounts of the first m load control terminals in the priority cut-off sequence of the k+1th stable control substation is smaller than the actual total tangential load amount of the k+1th stable control substation; the sum of the addition of the tangential load amounts of the first m+1 load control terminals in the priority cutting sequence of the k+1 stable control substation is larger than or equal to the actual total tangential load amount of the k+1 stable control substation; the sum of the load amounts of the first n loads in the priority cutting sequence of the loads controlled by the m+1th load control terminal in the k+1th stable control substation is smaller than the total load amount distributed by the m+1th load control terminal in the k+1th stable control substation; the sum of the load amounts of the first n+1 loads in the priority cutting sequence of the loads controlled by the m+1 negative control terminals in the k+1 stable control sub-station is larger than or equal to the total load amount distributed by the m+1 negative control terminals in the k+1 stable control sub-station; m and n are positive integers; it should be noted that, for the determination of the first n+1 loads to be cut out in the m+1 negative control terminal, the principle is the same as that of the k+1 stable control sub-station, and the actual total cut-out load of the k+1 stable control sub-station is distributed to specific loads in a layer-by-layer pushing mode;
Then, in the initial load cutting set, deleting the load controlled by each negative control terminal in the stable control sub-station with the actual total amount of all the cut loads being 0, further deleting the load controlled by the negative control terminal after the m+1th load controlled by the priority cutting sequence of each negative control terminal in the k+1th stable control sub-station and deleting the load after the n+1th load controlled by the m+1th load control terminal in the k+1th stable control sub-station, updating to obtain a final load cutting set, namely deleting all the loads which are not distributed to the cut load in the initial load cutting set, so that the load quantity of the selected cut load is accurately matched with the load quantity required to be cut by the system;
and finally, according to the obtained final load cut-off set, cutting off the load in the obtained final load cut-off set in sequence, namely executing tripping operation of the corresponding load switch.
As shown in fig. 3, in the embodiment of the present invention, an accurate load control system based on multidimensional load attribute is provided, which is used on a three-level tree network (as shown in fig. 2) formed by a stable control master station, a plurality of stable control substations and a plurality of negative control terminals; each stability control substation is connected with the stability control main station, and each stability control substation is also correspondingly connected with a plurality of negative control terminals respectively, and the method comprises the following steps:
The assignment unit 10 is configured to determine a common dimension attribute of the load controlled by each load control terminal, take the obtained common dimension attribute as an evaluation index, and further assign a corresponding weight value to each evaluation index;
the load priority removal sequence obtaining unit 20 is configured to obtain a score of each evaluation index of the load controlled by each negative control terminal, assign a corresponding weight value to each evaluation index and obtain a score of each evaluation index of the load controlled by each negative control terminal, calculate a composite score of the load controlled by each negative control terminal, and further obtain a priority removal sequence of the load controlled by each negative control terminal according to the calculated composite score of the load controlled by each negative control terminal;
the load control terminal priority removal sequence obtaining unit 30 is configured to aggregate the tangential load amounts of the load control terminals in each of the stability control substations to obtain a theoretical total tangential load amount of each of the stability control substations, and obtain a priority removal sequence of each of the load control terminals in the same stability control substation according to the calculated comprehensive score of the load controlled by each of the load control terminals;
the load accurate cutting unit 40 is configured to obtain a total cut load amount of the stability control master station when the main network link line or the extra-high voltage direct current fault occurs, and distribute the total cut load amount of the stability control master station to the corresponding stability control slave station according to a preset cutting weight value of each stability control slave station and the obtained total cut load theoretical amount of each stability control slave station, obtain an actual cut load amount of each stability control slave station and an actual cut load amount of each load control terminal correspondingly connected to the actual cut load amount of each stability control slave station, and further sequentially cut loads controlled by each load control terminal in which the actual cut load amount is not 0 in each stability control slave station in which the actual cut load amount is not 0 according to the obtained priority cutting order of each load control terminal in the same stability control slave station and the priority cutting order of each load controlled by each load control terminal.
Wherein the common dimension attributes include outage loss, the power sector to which it belongs, sensitivity, and electrical distance.
The priority cutting order of the loads controlled by each negative control terminal is obtained by arranging the comprehensive scores of the loads controlled by the same negative control terminal from large to small.
The priority cutting order of the negative control terminals in the same stable control substation is obtained by adding and averaging the comprehensive scores of the loads controlled by the negative control terminals in the same stable control substation and then arranging the average values from large to small.
Wherein the load accurate cut-off unit 40 includes:
the master station load distribution sequence obtaining module 401 is configured to obtain the total cut-off load of the stability control master station when a main network tie line or an extra-high voltage direct current fault occurs, and determine the distribution sequence of the total cut-off load of the stability control master station according to the preset cut-off weight value of each stability control substation;
a substation screening module 402, configured to determine, in the allocation order, first k+1 stability control substations for allocation of a total amount of tangential load of the stability control master station; the sum of the theoretical total tangential loads of the first k stability control substations in the distribution sequence is smaller than the total tangential load of the stability control master station; the sum of the theoretical total tangential loads of the k+1 stability control substations in the distribution sequence is greater than or equal to the total tangential load of the stability control master station; k is a positive integer;
A substation load obtaining module 403, configured to set the theoretical total of the cleavable loads of the first k stability control substations in the allocation sequence to be the actual total of the respective cleavable loads, set the difference value of the sum of the total of the cleavable loads of the stability control master station and the theoretical total of the cleavable loads of the first k stability control substations in the allocation sequence to be the actual total of the cleavable loads of the (k+1) th stability control substations in the allocation sequence, and set 0 to be the actual total of the cleavable loads of the stability control substations after the (k+1) th stability control substation in the allocation sequence;
the load cut-off set initial module 404 is configured to sequentially and layer-by-layer advance the loads controlled by the negative control terminals in all the stable control substations to form an initial load cut-off set according to the allocation sequence, the obtained priority cut-off sequence of the negative control terminals in each stable control substation, and the priority cut-off sequence of the loads controlled by each negative control terminal;
the load precision determining module 405 is configured to obtain a priority removal sequence of each negative control terminal in the k+1th stable control substation in the allocation sequence, determine, in the priority removal sequence of each negative control terminal in the k+1th stable control substation, a first m+1 negative control terminal for total allocation of the actual total amount of the switchable loads of the k+1th stable control substation, and further determine a first n+1 load to be removed in the m+1th negative control terminal according to the priority removal sequence of the load controlled by the m+1th negative control terminal; wherein, the sum of the tangential load amounts of the first m load control terminals in the priority cutting sequence of the k+1th stable control substation is smaller than the actual total tangential load amount of the k+1th stable control substation; the sum of the tangential load amounts of the first m+1 load control terminals in the priority cutting sequence of the k+1 stable control sub-station is more than or equal to the actual total tangential load amount of the k+1 stable control sub-station; the sum of the load amounts of the first n loads in the priority cutting sequence of the loads controlled by the m+1th negative control terminal in the k+1th stable control substation is smaller than the total load amount distributed by the m+1th negative control terminal in the k+1th stable control substation; the sum of the load amounts of the first n+1 loads in the priority cutting sequence of the loads controlled by the m+1 negative control terminals in the k+1 stable control sub-station is larger than or equal to the total load amount distributed by the m+1 negative control terminals in the k+1 stable control sub-station; m and n are positive integers;
A load cut-off set final module 406, configured to delete, in the initial load cut-off set, loads controlled by each negative control terminal in all the stable control substations with the actual total amount of cut-off loads being 0, further delete loads controlled by the negative control terminals after the (m+1) th load controlled by the priority cut-off sequence of each negative control terminal in the (k+1) th stable control substation, and delete loads after the (n+1) th load controlled by the (m+1) th load controlled by the negative control terminal in the (k+1) th stable control substation, and update to obtain a final load cut-off set;
and the precise load shedding module 407 is configured to sequentially shed loads in the obtained final load shedding set according to the obtained final load shedding set.
The embodiment of the invention has the following beneficial effects:
according to the invention, large-scale interruptible loads in the power grid are cut off in a layered mode according to an importance level priority principle, when the last layer of load meeting the total required cut-off amount is cut off, the loads are sequentially cut off according to the priority order of the load control terminal until the total cut-off amount is met, the maximum error is the interruptible load amount on a shunt switch of a user, the problem that a large amount of overstock is easily caused due to overlarge granularity of a basic load cutting unit in the prior art can be solved, the load cutting precision is improved, layered and graded accurate load control is realized, and the safety operation of the power grid is ensured.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. An accurate load control method based on multidimensional load attributes is used for a three-level tree network formed by a stable control main station, a plurality of stable control sub-stations and a plurality of negative control terminals; each stability control substation is connected with the stability control main station, and each stability control substation is correspondingly connected with a plurality of negative control terminals; characterized in that the method comprises the steps of:
Determining a common dimension attribute of the load controlled by each load control terminal, taking the obtained common dimension attribute as an evaluation index, and further giving a corresponding weight value to each evaluation index;
obtaining the score of each evaluation index of the load controlled by each negative control terminal, giving a corresponding weight value according to each evaluation index and the obtained score of each evaluation index of the load controlled by each negative control terminal, calculating the comprehensive score of the load controlled by each negative control terminal, and further obtaining the priority cutting order of the load controlled by each negative control terminal according to the calculated comprehensive score of the load controlled by each negative control terminal;
summarizing the tangential load quantity of each negative control terminal in each stable control substation to obtain the tangential load theoretical total quantity of each stable control substation, and obtaining the priority cutting order of each negative control terminal in the same stable control substation according to the calculated comprehensive score of the load controlled by each negative control terminal;
acquiring the total cut-off load of the stable control main station when a main network interconnecting line or an extra-high voltage direct current fault occurs, distributing the total cut-off load of the stable control main station to corresponding stable control sub-stations according to a preset cut-off weight value of each stable control sub-station and the obtained theoretical total cut-off load of each stable control sub-station, obtaining the actual total cut-off load of each stable control sub-station and the actual cut-off load of each corresponding connected negative control terminal, and further cutting off the loads controlled by the negative control terminals of each stable control sub-station with the actual cut-off load of which the actual cut-off load is not 0 according to the obtained priority cut-off sequence of each negative control terminal in the same stable control sub-station and the priority cut-off sequence of the loads controlled by each negative control terminal;
The method comprises the specific steps of obtaining the total cut load of a main network interconnection line or an extra-high voltage direct current fault, distributing the total cut load of the main network to corresponding stable control substations according to a preset cut weight value of each stable control substation and the obtained total cut load theoretical amount of each stable control substation, obtaining the actual cut load total amount of each stable control substation and the actual cut load amount of each corresponding connected load terminal, and further cutting the load controlled by each load terminal in sequence according to the obtained priority cutting order of each load terminal in the same stable control substation and the priority cutting order of the load controlled by each load terminal, wherein the actual cut load total amount of each stable control substation is not 0, and the specific steps of cutting the load controlled by each load terminal in which the actual cut load amount of each stable control substation is not 0 comprise the following steps:
acquiring the total cut-off load of the stability control master station when a main network interconnecting line or an extra-high voltage direct current fault occurs, and determining the distribution sequence of the total cut-off load of the stability control master station according to the preset cut-off weight value of each stability control substation;
in the allocation sequence, determining the first k+1 stability control substations for the total tangential load allocation of the stability control master station; the sum of the theoretical total tangential loads of the first k stability control substations in the distribution sequence is smaller than the total tangential load of the stability control master station; the sum of the theoretical total tangential loads of the k+1 stability control substations in the distribution sequence is greater than or equal to the total tangential load of the stability control master station; k is a positive integer;
Setting the theoretical total amount of the cut-off loads of the k front stable control substations in the distribution sequence as the actual total amount of the cut-off loads of the same, setting the difference value of the sum of the total amount of the cut-off loads of the stable control master station and the theoretical total amount of the cut-off loads of the k front stable control substations in the distribution sequence as the actual total amount of the cut-off loads of the k+1th stable control substations in the distribution sequence, and setting 0 as the actual total amount of the cut-off loads of the k+1th stable control substations in the distribution sequence;
sequentially and gradually advancing the loads controlled by all the negative control terminals in all the stable control substations layer by layer to form an initial load cutting set according to the distribution sequence, the obtained priority cutting sequence of all the negative control terminals in all the stable control substations and the priority cutting sequence of the loads controlled by all the negative control terminals;
the method comprises the steps of obtaining a priority cutting order of each negative control terminal in a k+1th stable control substation in the allocation order, determining a first m+1th negative control terminal used for total distribution of the actual total amount of the cuttable load of the k+1th stable control substation in the priority cutting order of each negative control terminal in the k+1th stable control substation, determining a first n+1th load to be cut in the m+1th negative control terminal according to the priority cutting order of the load controlled by the m+1th negative control terminal; wherein, the sum of the tangential load amounts of the first m load control terminals in the priority cutting sequence of the k+1th stable control substation is smaller than the actual total tangential load amount of the k+1th stable control substation; the sum of the tangential load amounts of the first m+1 load control terminals in the priority cutting sequence of the k+1 stable control sub-station is more than or equal to the actual total tangential load amount of the k+1 stable control sub-station; the sum of the load amounts of the first n loads in the priority cutting sequence of the loads controlled by the m+1th negative control terminal in the k+1th stable control substation is smaller than the total load amount distributed by the m+1th negative control terminal in the k+1th stable control substation; the sum of the load amounts of the first n+1 loads in the priority cutting sequence of the loads controlled by the m+1 negative control terminals in the k+1 stable control sub-station is larger than or equal to the total load amount distributed by the m+1 negative control terminals in the k+1 stable control sub-station; m and n are positive integers;
In the initial load cutting set, deleting the load controlled by each negative control terminal in the stable control sub-station with the actual total amount of all the cut loads being 0, further deleting the load controlled by the negative control terminal after the m+1th load is controlled by the priority cutting sequence of each negative control terminal in the k+1th stable control sub-station, deleting the load after the n+1th load is controlled by the m+1th load control terminal in the k+1th stable control sub-station, and updating to obtain a final load cutting set;
and according to the obtained final load cutting set, sequentially cutting off the loads in the obtained final load cutting set.
2. The precision load control method based on multi-dimensional load properties according to claim 1, wherein the common dimensional properties include outage loss, belonging power utilization department, sensitivity and electrical distance.
3. The method for accurate load control based on multi-dimensional load attribute according to claim 1, wherein the priority cut-off sequence of the loads controlled by each negative control terminal is obtained by arranging the composite scores of the loads controlled by the same negative control terminal from large to small.
4. The accurate load control method based on the multidimensional load attribute according to claim 1, wherein the priority cut-off sequence of each negative control terminal in the same stable control substation is obtained by adding and averaging the integrated scores of the loads controlled by each negative control terminal in the same stable control substation and then arranging the integrated scores from large to small.
5. An accurate load control system based on multidimensional load attributes is used for a three-level tree network formed by a stable control main station, a plurality of stable control sub-stations and a plurality of negative control terminals; each stable control substation is connected with the stable control main station, and each stable control substation is also correspondingly connected with a plurality of negative control terminals, and the method is characterized by comprising the following steps:
the assignment unit is used for determining the common dimension attribute of the load controlled by each negative control terminal, taking the obtained common dimension attribute as an evaluation index, and further assigning a corresponding weight value to each evaluation index;
the load priority cutting order acquisition unit is used for acquiring the scores of the evaluation indexes of the loads controlled by each negative control terminal, giving corresponding weight values according to the evaluation indexes and the acquired scores of the evaluation indexes of the loads controlled by each negative control terminal, calculating the comprehensive score of the loads controlled by each negative control terminal, and further obtaining the priority cutting order of the loads controlled by each negative control terminal according to the calculated comprehensive score of the loads controlled by each negative control terminal;
the load control terminal priority cutting order acquisition unit is used for summarizing the tangential load quantity of each load control terminal in each stability control substation to obtain the tangential load theoretical total quantity of each stability control substation, and obtaining the priority cutting order of each load control terminal in the same stability control substation according to the calculated comprehensive score of the load controlled by each load control terminal;
The load accurate cutting unit is used for obtaining the total cut load of the stable control main station when a main network interconnecting line or an extra-high voltage direct current fault exists, distributing the total cut load of the stable control main station to the corresponding stable control sub station according to a preset cutting weight value of each stable control sub station and the obtained total cut load theoretical total cut load of each stable control sub station, obtaining the actual cut load total cut load of each stable control sub station and the actual cut load quantity of each corresponding connected load terminal, and further cutting loads controlled by each load terminal in each stable control sub station with the actual cut load total not being 0 according to the obtained priority cutting order of each load terminal in the same stable control sub station and the priority cutting order of the load controlled by each load terminal;
wherein, the accurate excision of load unit includes:
the master station load distribution sequence acquisition module is used for acquiring the total cut-off load of the stability control master station when a main network tie line or an extra-high voltage direct current fault occurs, and determining the distribution sequence of the total cut-off load of the stability control master station according to the preset cut-off weight value of each stability control substation;
The substation screening module is used for determining the first k+1 stability control substations for the total cut load distribution of the stability control master station in the distribution sequence; the sum of the theoretical total tangential loads of the first k stability control substations in the distribution sequence is smaller than the total tangential load of the stability control master station; the sum of the theoretical total tangential loads of the k+1 stability control substations in the distribution sequence is greater than or equal to the total tangential load of the stability control master station; k is a positive integer;
the substation load acquisition module is used for setting the theoretical total of the cleavable loads of the k front stable control substations in the distribution sequence as the actual total of the respective cleavable loads, setting the difference value of the sum of the total of the cleavable loads of the stable control master station and the theoretical total of the cleavable loads of the k front stable control substations in the distribution sequence as the actual total of the cleavable loads of the k+1th stable control substations in the distribution sequence, and setting 0 as the actual total of the cleavable loads of the stable control substations after the k+1th stable control substations in the distribution sequence;
the load cut-off set initial module is used for sequentially and gradually advancing the loads controlled by all the negative control terminals in all the stable control substations layer by layer to form an initial load cut-off set according to the distribution sequence, the obtained priority cut-off sequence of all the negative control terminals in all the stable control substations and the priority cut-off sequence of the loads controlled by all the negative control terminals;
The load precision determining module is used for acquiring the priority cutting order of each negative control terminal in the k+1th stable control substation in the allocation order, determining the first m+1th negative control terminal used for completely allocating the actual total quantity of the cut loads of the k+1th stable control substation in the priority cutting order of each negative control terminal in the k+1th stable control substation, and further determining the first n+1th load to be cut in the m+1th negative control terminal according to the priority cutting order of the loads controlled by the m+1th negative control terminal; wherein, the sum of the tangential load amounts of the first m load control terminals in the priority cutting sequence of the k+1th stable control substation is smaller than the actual total tangential load amount of the k+1th stable control substation; the sum of the tangential load amounts of the first m+1 load control terminals in the priority cutting sequence of the k+1 stable control sub-station is more than or equal to the actual total tangential load amount of the k+1 stable control sub-station; the sum of the load amounts of the first n loads in the priority cutting sequence of the loads controlled by the m+1th negative control terminal in the k+1th stable control substation is smaller than the total load amount distributed by the m+1th negative control terminal in the k+1th stable control substation; the sum of the load amounts of the first n+1 loads in the priority cutting sequence of the loads controlled by the m+1 negative control terminals in the k+1 stable control sub-station is larger than or equal to the total load amount distributed by the m+1 negative control terminals in the k+1 stable control sub-station; m and n are positive integers;
The load cutting set final module is used for deleting the load controlled by each negative control terminal in the stable control sub-station with the actual total amount of the cut load of 0 in the initial load cutting set, further deleting the load controlled by the negative control terminal after the m+1th load controlled by the priority cutting sequence of each negative control terminal in the k+1th stable control sub-station, deleting the load after the n+1th load controlled by the m+1th load controlled by the negative control terminal in the k+1th stable control sub-station, and updating to obtain the final load cutting set;
and the accurate load removal module is used for sequentially removing the loads in the obtained final load removal set according to the obtained final load removal set.
6. The precision load control system based on multi-dimensional load attributes of claim 5, wherein the common dimensional attributes include outage loss, belonging power usage department, sensitivity, and electrical distance.
7. The accurate load control system based on the multi-dimensional load attribute according to claim 5, wherein the priority cut-off sequence of the loads controlled by each negative control terminal is obtained by arranging the comprehensive scores of the loads controlled by the same negative control terminal from large to small.
8. The accurate load control system based on the multidimensional load attribute according to claim 5, wherein the priority cut-off sequence of the negative control terminals in the same stable control substation is obtained by adding and averaging the integrated scores of the loads controlled by the negative control terminals in the same stable control substation and then arranging the integrated scores from large to small.
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| CN113657032B (en) * | 2021-08-12 | 2023-11-24 | 国网安徽省电力有限公司 | Low-frequency load shedding method and system for pre-centralized coordination real-time distribution control |
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| CN105552919B (en) * | 2016-03-02 | 2018-02-02 | 东方电子股份有限公司 | Main transformer overload processing method after the action of power system prepared auto restart |
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