CN115513952B - Safety check method, system, equipment and medium for power generation and utilization of regional power grid - Google Patents

Safety check method, system, equipment and medium for power generation and utilization of regional power grid Download PDF

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CN115513952B
CN115513952B CN202211472924.2A CN202211472924A CN115513952B CN 115513952 B CN115513952 B CN 115513952B CN 202211472924 A CN202211472924 A CN 202211472924A CN 115513952 B CN115513952 B CN 115513952B
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subarea
power
bus load
regional
power grid
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CN115513952A (en
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王淼
孙博
吕闫
李理
石上丘
孙略
罗雅迪
马晓忱
王少芳
於益军
李立新
狄方春
李劲松
张印
郎燕生
宋旭日
杨楠
黄宇鹏
卫泽晨
李媛媛
陶蕾
黄运豪
刘升
门德月
韩锋
李森
焦永刚
闫翠会
张振
齐洋洋
李章文
韩巍
王伟
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China Electric Power Research Institute Co Ltd CEPRI
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China Electric Power Research Institute Co Ltd CEPRI
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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
    • 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
    • H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
    • 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
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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]

Abstract

The invention discloses a safety check method, a system, equipment and a medium for regional power grid power generation, which belong to the technical field of power grid dispatching and comprise the following steps: dividing a regional power grid into a plurality of subareas, wherein each subarea comprises a unit, a bus load and a direct-current tie line; calculating the total amount of the power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line; distributing the total amount of the power generation and utilization unbalance of each subarea into the bus load value of each subarea; calculating a regional power grid by adopting an alternating current power flow method, and acquiring deviation between future power flow of each sub-region and a planned value; correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea; and generating a future power flow section of the regional power grid through alternating current power flow calculation. The invention balances the power generation and utilization of the regional power grid through two-step load adjustment, and ensures the calculation convergence and accuracy of the safety check of the large power grid.

Description

Safety check method, system, equipment and medium for regional power grid power generation
Technical Field
The invention belongs to the technical field of power grid dispatching, and particularly relates to a safety check method, a system, equipment and a medium for power generation and utilization of a regional power grid.
Background
The regional power grid safety check is to form accurate and reasonable future operation mode data of the power grid according to plan and prediction data reported by each province, and to perform safety analysis on the operation state of the power grid, and is an important means for guaranteeing the safe operation of the power grid. The power generation plan and the bus load prediction required by the safety check calculation are inconsistent in time and space, the time is mainly reflected in that the power generation is smooth in time period, the load is continuously fluctuated, the space is mainly reflected in that the power generation is concentrated on a high-voltage power grid, the load is concentrated on a medium-low voltage power grid, the data source is adopted, the unit plan is compiled based on the system load prediction, and the bus load prediction is compiled based on the bus load historical data and data such as weather, maintenance, new energy prediction and the like. In addition, data quality such as unit plans, bus load prediction and the like reported by each province is different, so that when future power flow calculation is carried out, power generation and power utilization of a system are often unbalanced, and finally, the power flow calculation is not converged or the future power flow power of a cross-province connecting line deviates from the preset planned power, so that the calculation accuracy of regional power grid safety check is influenced.
A chinese patent application (application No. CN 201310153225.6) discloses a day-ahead static security check method, which includes the steps of: (1) Pre-checking and correcting the cross section power plan value of the inter-area tie line; (2) Performing alternating current load flow calculation, and calculating unbalanced active power of a balance node and each region; (3) And judging whether the absolute value of the unbalanced active power is smaller than a convergence standard, if so, adjusting the active power of the adjustable unit and the load, returning to the step 2, otherwise, carrying out load flow convergence, and carrying out N-1 and fault set calculation by using a load flow calculation result.
The method mainly comprises the steps of automatically digesting internal unbalanced power in proportion in the iterative computation process of the power flow by an alternating current power flow computing strategy for controlling the transmission power of a connecting line, because the method does not obtain the unbalance amount of each province before the power flow computation, the initial power generation and load can not be pre-balanced, the power generation or load needs to be corrected according to the transfer condition of the unbalanced power at a balanced node in the power flow computation, the computation is not converged probably because of overlarge unbalanced power, and in addition, the unbalanced power node allocation strategy provided by the patent can not realize regional allocation, so that the power of the connecting line is deviated from a planned value.
Disclosure of Invention
In view of the above-mentioned shortcomings, the present invention aims to provide a method, a system, a device and a medium for safety check of regional power grid power generation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a safety check method for regional power grid power generation comprises the following steps:
dividing a regional power grid into a plurality of subareas, wherein each subarea comprises a unit, a bus load and a direct-current tie line; calculating the total amount of power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
distributing the total power generation and utilization unbalance of each subarea to the bus load value of each subarea;
calculating a regional power grid by adopting an alternating current power flow method, and acquiring deviation between future power flow of each sub-region and a planned value; correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea; the method for correcting the bus load value of each subarea according to the deviation between the future tidal current and the planned value of each subarea comprises the following steps:
obtaining the proportion of each bus load to the total bus load according to the obtained deviation between the future power flow of each subarea and the plan value, and calculating the deviation between the future power flow of each subarea and the plan value
Figure 220779DEST_PATH_IMAGE001
The bus load of each subarea is shared to obtain the final bus load value of each subarea
Figure 837705DEST_PATH_IMAGE002
Comprises the following steps:
Figure 986927DEST_PATH_IMAGE003
in the formula (I), the compound is shown in the specification,
Figure 663896DEST_PATH_IMAGE004
for deviations between future flows and planned values for each sub-area,
Figure 836251DEST_PATH_IMAGE005
for the corrected value of the load on the bus,
Figure 522447DEST_PATH_IMAGE006
the number of bus loads in each subarea;
and generating a future power flow section of the regional power grid through alternating current power flow calculation.
As a further improvement of the present invention, the method for dividing the regional power grid into a plurality of sub-regions comprises:
and performing topology analysis by taking the alternating-current tie lines in the regional power grid as boundaries, dividing the regional power grid into a plurality of subareas by taking the provinces as units, and obtaining the unit, the bus load and the direct-current tie lines contained in each subarea.
As a further improvement of the present invention, the calculating the total amount of power generation and utilization imbalance of each sub-area based on the unit, the bus load and the dc link includes:
acquiring plan prediction data of each subarea in a regional power grid, wherein the plan prediction data comprises a unit plan, a bus load prediction and a direct-current tie line plan;
on the basis of the state estimation section of the regional power grid, a unit plan, bus load prediction and a direct current tie line plan are superposed on the unit, bus load and direct current tie line of each sub-region, the alternating current tie line plan of the regional power grid counts the sub-region where the sending and receiving ends of the alternating current tie line are located through a direction coefficient, the switching state of maintenance equipment is considered, and the total amount of power generation and power utilization imbalance of each sub-region is calculated.
As a further improvement of the present invention, the method for calculating the total amount of power generation and utilization imbalance of each sub-area comprises:
Figure 526175DEST_PATH_IMAGE007
wherein, the first and the second end of the pipe are connected with each other,
Figure 374046DEST_PATH_IMAGE008
，
Figure 299276DEST_PATH_IMAGE009
，
Figure 320322DEST_PATH_IMAGE010
，
Figure 647398DEST_PATH_IMAGE011
；
in the formula (I), the compound is shown in the specification,sis the number of each sub-area,iin order to be an index number of the picture,Lthe number of ac links for the regional power grid,K、M、Nthe number of the direct current connecting lines, the units and the bus loads of each subarea are respectively,
Figure 666170DEST_PATH_IMAGE012
、
Figure 609855DEST_PATH_IMAGE013
、
Figure 637854DEST_PATH_IMAGE014
、
Figure 553857DEST_PATH_IMAGE015
respectively the total power variation of the output of the machine set, the bus load, the direct current tie line and the alternating current tie line of each subarea,
Figure 9109DEST_PATH_IMAGE016
、
Figure 705670DEST_PATH_IMAGE017
、
Figure 6201DEST_PATH_IMAGE018
respectively planning power for each zone unit, bus load prediction power, and direct current tie line planning power,
Figure 42290DEST_PATH_IMAGE019
planning power for the regional grid ac tie,
Figure 465181DEST_PATH_IMAGE020
、
Figure 586721DEST_PATH_IMAGE021
、
Figure 690943DEST_PATH_IMAGE022
respectively estimating the output of the unit, the bus load and the initial power of the direct current connecting line of each subarea in the section for state estimation,
Figure 847118DEST_PATH_IMAGE023
for the initial power of the regional grid ac tie,
Figure 440911DEST_PATH_IMAGE024
is a directional coefficient;
Figure 784167DEST_PATH_IMAGE025
the total amount of the power generation and utilization imbalance of each subarea is calculated.
As a further improvement of the present invention, the allocating the total amount of the electricity generation and utilization imbalance of each sub-area to the bus load value of each sub-area includes:
according to the proportion of the predicted value of each bus load to the total predicted value of all bus loads, the total power generation and utilization unbalance of each subarea is distributed to the bus loads of each subarea to obtain the predicted value of the bus load of each subarea
Figure 692080DEST_PATH_IMAGE026
Comprises the following steps:
Figure 499499DEST_PATH_IMAGE027
in the formula (I), the compound is shown in the specification,
Figure 467456DEST_PATH_IMAGE028
predicting power for each sub-regional bus load,
Figure 298008DEST_PATH_IMAGE029
for the total amount of the power generation and utilization imbalance of each subarea,Nthe number of bus loads for each sub-area.
As a further improvement of the present invention, the calculating the regional power grid by using the ac power flow method to obtain the deviation between the future power flow and the planned value of each sub-region includes:
deviation between future power flow and planned value of each sub-region
Figure 9612DEST_PATH_IMAGE030
Including balancing the deviation between the future power flow of the node and the planned value and the deviation between the future power flow of the AC tie-line between the sub-regions and the planned value, selecting the firstrThe node where the station unit is located serves as a balance node, and specifically comprises the following steps:
Figure 937117DEST_PATH_IMAGE031
wherein the content of the first and second substances,sis the number of each sub-area,
Figure 810395DEST_PATH_IMAGE032
in order to balance the coefficients of the process,
Figure 128244DEST_PATH_IMAGE033
is a directional coefficient;
Figure 440277DEST_PATH_IMAGE034
and
Figure 425550DEST_PATH_IMAGE035
are respectively the firstrFuture power flows and unit plans for individual units,
Figure 469730DEST_PATH_IMAGE036
and
Figure 274875DEST_PATH_IMAGE037
are respectively the firstiThe incoming tidal current value and the projected value of each AC link,Lthe number of ac links.
A safety check system for regional power grid power generation and utilization comprises:
the system comprises a calculation module, a bus load module and a direct current tie line module, wherein the calculation module is used for dividing a regional power grid into a plurality of subareas, and each subarea comprises a unit, a bus load and a direct current tie line; calculating the total amount of the power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
the sharing module is used for sharing the total amount of the power generation and utilization unbalance of each subarea into the bus load value of each subarea;
the correction module is used for calculating the regional power grid by adopting an alternating current power flow method and acquiring the deviation between the future power flow and the planned value of each sub-region; correcting the bus load value of each subarea according to the deviation between the future power flow and the plan value of each subarea;
and the generation module is used for generating a future power flow section of the regional power grid through alternating current power flow calculation.
As a further improvement of the present invention, in the calculation module, the method for calculating the total amount of power generation and utilization imbalance of each sub-area comprises:
acquiring plan prediction data of each subarea in a regional power grid, wherein the plan prediction data comprises a unit plan, bus load prediction and a direct-current tie line plan;
on the basis of the state estimation section of the regional power grid, a unit plan, bus load prediction and a direct current tie line plan are superposed on the unit, bus load and direct current tie line of each sub-region, the alternating current tie line plan of the regional power grid counts the sub-region where the sending and receiving ends of the alternating current tie line are located through a direction coefficient, the switching state of maintenance equipment is considered, and the total amount of power generation and power utilization imbalance of each sub-region is calculated.
An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for security check of electricity generation of a regional power grid when executing the computer program.
A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method for security check of electricity generation of a regional power grid.
Compared with the prior art, the invention has the advantages that:
the regional power grid is divided into a plurality of subareas; calculating the total amount of the electricity generation and utilization unbalance of each subarea; the total amount of the unbalance of the electricity utilization is shared; calculating the deviation between the future power flow and the planned value; and correcting the predicted value of the bus load of each subarea to generate a future power flow section of the regional power grid. The invention considers the tie line deviation and the balance node deviation, and ensures the calculation convergence and the accuracy of the safety check of the large power grid through two-step load adjustment.
Drawings
Fig. 1 is a flow chart of a safety check method for power generation and utilization of a regional power grid according to the present invention;
FIG. 2 is a detailed flowchart of a safety check method for regional power grid power generation according to the present invention;
FIG. 3 is a safety check system for regional power grid power generation and utilization in consideration of tie line deviation and balance node deviation according to the present invention;
fig. 4 is a schematic diagram of an electronic device according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the present invention provides a safety check method for regional power grid power generation, including:
in the S1, a regional power grid is divided into a plurality of subareas, and each subarea comprises a unit, a bus load and a direct-current tie line; calculating the total amount of the power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
s2, distributing the total amount of the power generation and utilization unbalance of each subarea into the bus load values of each subarea;
s3, calculating the regional power grid by adopting an alternating current power flow method, and acquiring the deviation between the future power flow of each sub-region and a planned value;
and S4, correcting the bus load value of each subarea according to the deviation between the future power flow of each subarea and the planned value, and further generating a future power flow section of the regional power grid through alternating current power flow calculation.
The method divides a regional power grid into a plurality of subareas with provinces as units; calculating the total power generation and utilization unbalance of each subarea; distributing the total unbalanced electricity generation and utilization amount of each subarea to the bus load of each subarea; carrying out future power flow calculation on the regional power grid by adopting an alternating current power flow method, and obtaining the deviation between the future power flow of each sub-region in the regional power grid and a planned value; and correcting the predicted value of the bus load of each subarea again to generate a future power flow section of the regional power grid. The method balances the power generation and the power utilization of the regional power grid through two-step load adjustment, and ensures the calculation convergence and the accuracy of the security check of the large power grid.
The above steps of the present invention are explained in detail with reference to fig. 2:
1) Data processing
Firstly, an alternating current tie line in a regional power grid needs to be acquired.
2) Topological partitioning
In S1, the method for dividing the regional power grid into a plurality of sub-regions comprises the following steps:
and performing topology analysis by taking the alternating-current tie lines in the regional power grid as boundaries, dividing the regional power grid into a plurality of subareas by taking provinces as units, and obtaining the units, the bus loads and the direct-current tie lines contained in each subarea.
3) Zoned imbalance calculation
In S1, the method for calculating the total amount of power generation and power utilization imbalance of each sub-area includes:
acquiring plan prediction data of each subarea in a regional power grid, wherein the plan prediction data comprises a unit plan, a bus load prediction and a direct-current tie line plan;
on the basis of the state estimation section of the regional power grid, a unit plan, bus load prediction and a direct current tie line plan are superposed on the unit, bus load and direct current tie line of each sub-region, the alternating current tie line plan of the regional power grid counts the sub-region where the sending and receiving ends of the alternating current tie line are located through a direction coefficient, the switching state of maintenance equipment is considered, and the total amount of power generation and power utilization imbalance of each sub-region is calculated.
In the above step, the method for calculating the total amount of power generation and power utilization imbalance of each sub-area comprises:
Figure 125019DEST_PATH_IMAGE007
wherein the content of the first and second substances,
Figure 699220DEST_PATH_IMAGE008
，
Figure 179880DEST_PATH_IMAGE009
，
Figure 534638DEST_PATH_IMAGE010
，
Figure 126156DEST_PATH_IMAGE011
；
in the formula (I), the compound is shown in the specification,sis the number of each sub-area,iin order to be an index number of the picture,Lthe number of ac tie lines for the regional power grid,K、M、Nthe number of the direct current tie lines, the machine set and the bus loads of each subarea respectively,
Figure 820442DEST_PATH_IMAGE012
、
Figure 472004DEST_PATH_IMAGE013
、
Figure 48478DEST_PATH_IMAGE014
、
Figure 178108DEST_PATH_IMAGE015
respectively the total power variation of the output of the machine set, the bus load, the direct current tie line and the alternating current tie line of each subarea,
Figure 992481DEST_PATH_IMAGE016
、
Figure 611681DEST_PATH_IMAGE017
、
Figure 878714DEST_PATH_IMAGE018
respectively planning power for each zone unit, bus load prediction power, and direct current tie line planning power,
Figure 812035DEST_PATH_IMAGE019
planning power for the regional grid ac tie,
Figure 480914DEST_PATH_IMAGE020
、
Figure 271015DEST_PATH_IMAGE021
、
Figure 759765DEST_PATH_IMAGE022
respectively estimating the output of the unit, the bus load and the initial power of the direct current connecting line of each subarea in the section for state estimation,
Figure 762357DEST_PATH_IMAGE023
for the initial power of the regional grid ac tie,
Figure 82479DEST_PATH_IMAGE038
is a directional coefficient; if it is usedsThe sub-regions are the sending ends of the AC junctor, then
Figure 246745DEST_PATH_IMAGE039
If the receiving end of the AC connecting line is,
Figure 222791DEST_PATH_IMAGE040
and if not, the step (B),
Figure 560231DEST_PATH_IMAGE041
；
Figure 938123DEST_PATH_IMAGE025
and (4) generating and using the total amount of electricity unbalance of each subarea.
4) First step load adjustment
In S2, the allocating the total amount of power generation and power utilization imbalance of each sub-area to the bus load value of each sub-area includes:
according to the proportion of the predicted value of each bus load to the total predicted value of all bus loads, the total power generation and utilization unbalance of each subarea is distributed to the bus loads of each subarea to obtain the predicted value of the bus load of each subarea
Figure 273289DEST_PATH_IMAGE042
Comprises the following steps:
Figure 736632DEST_PATH_IMAGE043
in the formula (I), the compound is shown in the specification,
Figure 877763DEST_PATH_IMAGE044
predicting power for each sub-regional bus load,
Figure 110161DEST_PATH_IMAGE045
for the total amount of the power generation and utilization imbalance of each subarea,Nthe number of bus loads for each sub-area.
5) Load flow calculation and regional power deviation calculation
In S3, the calculating the regional power grid by using the ac power flow method to obtain the deviation between the future power flow of each sub-region and the planned value includes:
deviation between future power flow and planned value of each sub-region
Figure 616229DEST_PATH_IMAGE046
Including balancing the deviation between the future power flow of the node and the planned value and the deviation between the future power flow of the communication link between the subareas and the planned value, selecting the firstrThe node where the station unit is located serves as a balance node, and specifically comprises the following steps:
Figure 566867DEST_PATH_IMAGE047
wherein the content of the first and second substances,sis the number of each sub-area,
Figure 246110DEST_PATH_IMAGE048
is a directional coefficient;
Figure 333015DEST_PATH_IMAGE049
to balance the coefficients, ifrSet in sub-areasIn the interior of said container body,
Figure 275563DEST_PATH_IMAGE050
and if not, the step (B),
Figure 510236DEST_PATH_IMAGE051
；
Figure 196432DEST_PATH_IMAGE052
and
Figure 137843DEST_PATH_IMAGE053
are respectively the firstrFuture power flows and unit plans for individual units,
Figure 251293DEST_PATH_IMAGE054
and
Figure 973261DEST_PATH_IMAGE055
are respectively the firstiThe incoming current value and the planned value of each AC link,Lthe number of ac links.
6) Second step load adjustment
S4, correcting the bus load value of each subarea according to the deviation between the future tidal current and the planned value of each subarea comprises the following steps:
obtaining the total proportion of each bus load in all bus loads according to the obtained deviation between the future power flow of each subarea and the planned value, and calculating the deviation between the future power flow of each subarea and the planned value
Figure 931990DEST_PATH_IMAGE056
The bus load of each subarea is shared to obtain the final bus load value of each subarea
Figure 259066DEST_PATH_IMAGE057
Comprises the following steps:
Figure 74575DEST_PATH_IMAGE058
in the formula (I), the compound is shown in the specification,sis the number of each sub-area,
Figure 487102DEST_PATH_IMAGE059
for deviations between future flows and planned values for each sub-area,
Figure 249521DEST_PATH_IMAGE060
for the bus load value after the first step of correction,Nthe number of bus loads for each sub-area.
7) Second load flow calculation
And generating a future power flow section of the regional power grid.
The method improves the convergence and accuracy of the calculation of the future power flow section by a two-step allocation method of the unbalance power allocation of power and load in each subarea and the unbalance power allocation of the balance node.
In conclusion, regional power grid security check plays an important role in ensuring the safety of plan execution and market operation, the premise that the security check result is accurate is to ensure regional balance of a power grid and power balance of a cross-provincial tie line, the provincial and provincial spot market is rapidly developed at present, a sub-center is under greater and greater pressure in ensuring the safe operation of the power grid, the security check is performed not only in the day ahead, but also in the day, rolling security check is performed, the accuracy and the reasonability of the calculation result become important, and the invention has more application spaces.
As shown in fig. 3, the present invention further provides a safety check system for regional power grid power generation, including:
the system comprises a calculation module, a bus load module and a direct current tie line module, wherein the calculation module is used for dividing a regional power grid into a plurality of subareas, and each subarea comprises a unit, a bus load and a direct current tie line; calculating the total amount of power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
the sharing module is used for sharing the total amount of the power generation and utilization unbalance of each subarea into the bus load value of each subarea;
the correction module is used for calculating the regional power grid by adopting an alternating current power flow method and acquiring the deviation between the future power flow of each sub-region and a planned value; correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea;
and the generation module is used for generating a future power flow section of the regional power grid through alternating current power flow calculation.
In the calculation module, the method for calculating the total amount of the power generation and utilization imbalance of each subarea comprises the following steps:
acquiring plan prediction data of each subarea in a regional power grid, wherein the plan prediction data comprises a unit plan, a bus load prediction and a direct-current tie line plan;
on the basis of the state estimation section of the regional power grid, a unit plan, bus load prediction and a direct current tie line plan are superposed on the unit, bus load and direct current tie line of each sub-region, the alternating current tie line plan of the regional power grid counts the sub-region where the sending and receiving ends of the alternating current tie line are located through a direction coefficient, the switching state of maintenance equipment is considered, and the total amount of power generation and power utilization imbalance of each sub-region is calculated.
As shown in fig. 4, the present invention provides an electronic device, which includes 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 security check method for power generation and utilization of the regional power grid when executing the computer program.
The safety checking method for the power generation and utilization of the regional power grid comprises the following steps:
dividing a regional power grid into a plurality of subareas, wherein each subarea comprises a unit, a bus load and a direct-current tie line; calculating the total amount of the power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
distributing the total power generation and utilization unbalance of each subarea to the bus load value of each subarea;
calculating a regional power grid by adopting an alternating current power flow method, and acquiring deviation between future power flow of each sub-region and a planned value; correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea;
and generating a future power flow section of the regional power grid through alternating current power flow calculation.
The present invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the safety check method for regional power grid power generation.
The safety checking method for the power generation and utilization of the regional power grid comprises the following steps:
dividing a regional power grid into a plurality of subareas, wherein each subarea comprises a unit, a bus load and a direct-current tie line; calculating the total amount of power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
distributing the total amount of the power generation and utilization unbalance of each subarea into the bus load value of each subarea;
calculating a regional power grid by adopting an alternating current power flow method, and acquiring deviation between future power flow of each sub-region and a planned value; correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea;
and generating a future power flow section of the regional power grid through alternating current power flow calculation.
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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (5)

1. A safety check method for regional power grid power generation is characterized by comprising the following steps:
dividing a regional power grid into a plurality of subareas, wherein each subarea comprises a unit, a bus load and a direct-current tie line; calculating the total amount of power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line; based on unit, bus load and direct current junctor, calculate the power generation and utilization unbalanced total volume in each subregion, include:
acquiring plan prediction data of each subarea in a regional power grid, wherein the plan prediction data comprises a unit plan, a bus load prediction and a direct-current tie line plan;
on the basis of a regional power grid state estimation section, a unit plan, bus load prediction and a direct current tie line plan are superposed on a unit, bus load and a direct current tie line of each sub-region, the alternating current tie line plan of the regional power grid counts the sub-region where a sending end and a receiving end of the alternating current tie line are located through a direction coefficient, and the total generating and consuming power unbalance amount of each sub-region is calculated by considering the switching state of maintenance equipment;
the method for calculating the total power generation and utilization unbalance of each subarea comprises the following steps:
Figure 637529DEST_PATH_IMAGE001
wherein the content of the first and second substances,
Figure 640251DEST_PATH_IMAGE002
，
Figure 602391DEST_PATH_IMAGE003
，
Figure 981551DEST_PATH_IMAGE004
，
Figure 345536DEST_PATH_IMAGE005
；
in the formula (I), the compound is shown in the specification,sis the number of each sub-area,Lthe number of ac tie lines for the regional power grid,K、M、Nthe number of the direct current connecting lines, the units and the bus loads of each subarea are respectively,
Figure 706110DEST_PATH_IMAGE006
、
Figure 906278DEST_PATH_IMAGE007
、
Figure 338397DEST_PATH_IMAGE008
、
Figure 62550DEST_PATH_IMAGE009
respectively the total power variation of the output of the machine set, the bus load, the direct current tie line and the alternating current tie line of each subarea,
Figure 921921DEST_PATH_IMAGE010
、
Figure 343806DEST_PATH_IMAGE011
、
Figure 517299DEST_PATH_IMAGE012
respectively planning power for each zone unit, bus load prediction power, and direct current tie line planning power,
Figure 590297DEST_PATH_IMAGE013
planning power for the regional grid ac tie,
Figure 371302DEST_PATH_IMAGE014
、
Figure 342800DEST_PATH_IMAGE015
、
Figure 116721DEST_PATH_IMAGE016
respectively estimating the output of the unit, the bus load and the initial power of the direct current connecting line of each subarea in the section for state estimation,
Figure 792029DEST_PATH_IMAGE017
for the initial power of the regional grid ac link,
Figure 993203DEST_PATH_IMAGE018
is a directional coefficient;
Figure 389680DEST_PATH_IMAGE019
the total amount of the power generation and utilization unbalance of each subarea is calculated;
distributing the total amount of the power generation and utilization unbalance of each subarea into the bus load value of each subarea; the step of distributing the total power generation and utilization imbalance of each subarea to the bus load value of each subarea comprises the following steps:
according to the proportion of the predicted value of each bus load to the total predicted value of all bus loads, the total power generation and utilization unbalance of each subarea is distributed to the bus loads of each subarea to obtain the predicted value of the bus load of each subarea
Figure 701713DEST_PATH_IMAGE020
Comprises the following steps:
Figure 500036DEST_PATH_IMAGE021
in the formula (I), the compound is shown in the specification,
Figure 872111DEST_PATH_IMAGE022
predicting power for each partitioned bus load,
Figure 755885DEST_PATH_IMAGE023
the total amount of the power generation and utilization unbalance of each subarea is calculated;
calculating a regional power grid by adopting an alternating current power flow method, and acquiring deviation between future power flow of each sub-region and a planned value; correcting the bus load value of each subarea according to the deviation between the future power flow and the plan value of each subarea; the method for correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea comprises the following steps:
obtaining the total proportion of each bus load in all bus loads according to the obtained deviation between the future power flow of each subarea and the planned value, and calculating the deviation between the future power flow of each subarea and the planned value
Figure 871608DEST_PATH_IMAGE024
The bus load of each subarea is shared to obtain the final bus load value of each subarea
Figure 521508DEST_PATH_IMAGE025
Comprises the following steps:
Figure 64485DEST_PATH_IMAGE026
in the formula (I), the compound is shown in the specification,
Figure 169975DEST_PATH_IMAGE027
for deviations between future flows and planned values for each sub-area,iin order to be an index number of the picture,
Figure 89390DEST_PATH_IMAGE028
for the corrected value of the load on the bus,Nthe number of bus loads in each subarea;
generating a future power flow section of the regional power grid through alternating current power flow calculation;
the method for calculating the regional power grid by adopting the alternating current power flow method to obtain the deviation between the future power flow of each sub-region and the planned value comprises the following steps:
deviation between future power flow and planned value of each sub-region
Figure 596726DEST_PATH_IMAGE029
Including balancing the deviation between the future power flow of the node and the planned value and the deviation between the future power flow of the communication link between the subareas and the planned value, selecting the firstrThe node where the station unit is located serves as a balance node, and specifically comprises the following steps:
Figure 310604DEST_PATH_IMAGE030
wherein the content of the first and second substances,sis the number of each sub-area,
Figure 168969DEST_PATH_IMAGE031
in order to balance the coefficients of the coefficients,
Figure 626496DEST_PATH_IMAGE032
is a directional coefficient;
Figure 985408DEST_PATH_IMAGE033
and
Figure 135767DEST_PATH_IMAGE034
are respectively the firstrThe future tidal current value and the unit plan value of each unit,
Figure 215849DEST_PATH_IMAGE035
and
Figure 477067DEST_PATH_IMAGE036
are respectively the firstiThe incoming current value and the unit plan value of each AC tie line,Lthe number of ac links.
2. The safety checking method for the power generation and utilization of the regional power grid according to claim 1, wherein the method for dividing the regional power grid into a plurality of sub-regions comprises the following steps:
and performing topology analysis by taking the alternating-current tie lines in the regional power grid as boundaries, dividing the regional power grid into a plurality of subareas by taking provinces as units, and obtaining the units, the bus loads and the direct-current tie lines contained in each subarea.
3. A safety check system for regional power grid power generation based on the steps of the safety check method for regional power grid power generation of claim 1 or 2, comprising:
the system comprises a calculation module, a bus load module and a direct current tie line module, wherein the calculation module is used for dividing a regional power grid into a plurality of subareas, and each subarea comprises a unit, a bus load and a direct current tie line; calculating the total amount of the power generation and utilization imbalance of each subarea based on the unit, the bus load and the direct current tie line;
the sharing module is used for sharing the total amount of the power generation and utilization unbalance of each subarea into the bus load value of each subarea;
the correction module is used for calculating the regional power grid by adopting an alternating current power flow method and acquiring the deviation between the future power flow and the planned value of each sub-region; correcting the bus load value of each subarea according to the deviation between the future power flow and the planned value of each subarea;
and the generation module is used for generating a future power flow section of the regional power grid through alternating current power flow calculation.
4. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the safety check method for regional power grid power generation of claim 1 or 2 when executing the computer program.
5. A computer-readable storage medium, which stores a computer program that, when being executed by a processor, implements the steps of the method for security check of regional power grid power generation according to claim 1 or 2.
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