CN115513952A - Safety check method, system, equipment and medium for regional power grid power generation - Google Patents

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

Info

Publication number
CN115513952A
CN115513952A CN202211472924.2A CN202211472924A CN115513952A CN 115513952 A CN115513952 A CN 115513952A CN 202211472924 A CN202211472924 A CN 202211472924A CN 115513952 A CN115513952 A CN 115513952A
Authority
CN
China
Prior art keywords
subarea
power
bus load
regional
power grid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202211472924.2A
Other languages
Chinese (zh)
Other versions
CN115513952B (en
Inventor
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
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Electric Power Research Institute Co Ltd CEPRI
Original Assignee
China Electric Power Research Institute Co Ltd CEPRI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Electric Power Research Institute Co Ltd CEPRI filed Critical China Electric Power Research Institute Co Ltd CEPRI
Priority to CN202211472924.2A priority Critical patent/CN115513952B/en
Publication of CN115513952A publication Critical patent/CN115513952A/en
Application granted granted Critical
Publication of CN115513952B publication Critical patent/CN115513952B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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 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 plan value of each subarea; and generating a future power flow section of the regional power grid through alternating current power flow calculation. 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.

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 checking 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 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 embodied in that the power generation is gentle in time period, the load is continuously fluctuated, the space is mainly embodied in that the power generation is concentrated on a high-voltage power grid, the load is concentrated on a medium-low voltage power grid, and a data source is provided. 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 (3) 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 checking method for power generation and utilization of a 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; 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, 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 power 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,iis a reference number of a digital video tape,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 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
are respectively divided into each subareaThe planned power of the domain unit, the predicted power of the bus load, the planned power of the direct current tie line,
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
and (4) generating and using the total amount of electricity unbalance of each subarea.
As a further improvement of the present invention, the step of distributing the total amount of the power 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，
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-area
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 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 937117DEST_PATH_IMAGE031
wherein, the first and the second end of the pipe are connected with each other,sis the number of each sub-area,
Figure 810395DEST_PATH_IMAGE032
in order to balance the coefficients of the coefficients,
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 current value and the planned value of each AC link,Lis the 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 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 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, a 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 end and the receiving end of the alternating current tie line are located through a direction coefficient, and the total amount of the power generation and utilization imbalance of each sub-region is calculated by considering the on-off state of maintenance equipment.
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 method divides a regional power grid 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 a 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 regional power grid power generation 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 those skilled in the art better understand the technical solutions of the present invention, 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. Furthermore, 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:
the method comprises the following steps that 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 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 taking provinces as units; calculating the total amount of the electricity 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; performing future power flow calculation on the regional power grid by adopting an alternating current power flow method to obtain the deviation between the future power flow of each subarea 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 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.
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 includes:
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 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, 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 steps, the method for calculating the total amount of power generation and utilization imbalance of each subarea comprises:
Figure 125019DEST_PATH_IMAGE007
wherein, the first and the second end of the pipe are connected with each other,
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 connecting lines, the units and the bus loads of each subarea are 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 regional unit, bus load prediction power, 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 link,
Figure 82479DEST_PATH_IMAGE038
is a directional coefficient; if it is notsThe sub-region is the sending end of the AC connecting line
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 partitioned 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-region.
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-area
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 first and the second end of the pipe are connected with each other,sis the number of each sub-area,
Figure 246110DEST_PATH_IMAGE048
is a directional coefficient;
Figure 333015DEST_PATH_IMAGE049
to balance the coefficients, ifrThe table set is in a subareasIn the interior of the container body,
Figure 275563DEST_PATH_IMAGE050
if not, then,
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 tidal current value and the projected value of each AC link,Lis the 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 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 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-region.
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 power generation and utilization of a regional power grid, 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 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.
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, 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 end and the receiving end of the alternating current tie line are located through a direction coefficient, and the total amount of the power generation and utilization imbalance of each sub-region is calculated by considering the on-off state of maintenance equipment.
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 also provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps of the method for security check of power generation and utilization of a regional power grid.
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 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.
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 has been 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 (10)

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;
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:
according to the obtained future trend of each subareaDeviation between the planned values to obtain the total proportion of each bus load to all the bus loads, and deviation between the future power flow of each subarea and the planned values
Figure 529358DEST_PATH_IMAGE001
The bus load of each subarea is shared to obtain the final bus load value of each subarea
Figure 975383DEST_PATH_IMAGE002
Comprises the following steps:
Figure 902888DEST_PATH_IMAGE003
in the formula (I), the compound is shown in the specification,
Figure 41745DEST_PATH_IMAGE004
for deviations between future flows and planned values for each sub-area,iin order to be an index number of the picture,
Figure 359594DEST_PATH_IMAGE005
for the corrected value of the load on the bus,Nthe 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.
2. The safety check method for regional power grid power generation according to claim 1, wherein 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.
3. The safety check method for regional power grid power generation according to claim 1, wherein the calculating of the total amount of imbalance of power generation and utilization of each sub-region based on the unit, the bus load and the dc link comprises:
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 end and the receiving end of the alternating current tie line are located through a direction coefficient, and the total amount of the power generation and utilization imbalance of each sub-region is calculated by considering the on-off state of maintenance equipment.
4. The safety check method for regional power grid power generation and utilization according to claim 3, wherein the method for calculating the total amount of power generation and utilization imbalance of each sub-region comprises the following steps:
Figure 406047DEST_PATH_IMAGE006
wherein the content of the first and second substances,
Figure 391321DEST_PATH_IMAGE007
，
Figure 435500DEST_PATH_IMAGE008
，
Figure 302962DEST_PATH_IMAGE009
，
Figure 356369DEST_PATH_IMAGE010
；
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 tie lines, the machine set and the bus loads of each subarea respectively,
Figure 930570DEST_PATH_IMAGE011
、
Figure 411229DEST_PATH_IMAGE012
、
Figure 500408DEST_PATH_IMAGE013
、
Figure 357506DEST_PATH_IMAGE014
respectively the total power variation of the output of the unit, the bus load, the direct current tie line and the alternating current tie line of each subarea,
Figure 786213DEST_PATH_IMAGE015
、
Figure 234512DEST_PATH_IMAGE016
、
Figure 279828DEST_PATH_IMAGE017
respectively planning power for each zone unit, bus load prediction power, and direct current tie line planning power,
Figure 409458DEST_PATH_IMAGE018
planning power for the regional grid ac tie,
Figure 754989DEST_PATH_IMAGE019
、
Figure 843031DEST_PATH_IMAGE020
、
Figure 844485DEST_PATH_IMAGE021
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 state estimation section,
Figure 777806DEST_PATH_IMAGE022
for the initial power of the regional grid ac tie,
Figure 243422DEST_PATH_IMAGE023
is a directional coefficient;
Figure 236786DEST_PATH_IMAGE024
the total amount of the power generation and utilization imbalance of each subarea is calculated.
5. The safety check method for regional power grid power generation and utilization according to claim 1, wherein the step of distributing the total amount of power generation and utilization imbalance of each sub-region to the bus load value of each sub-region comprises:
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 725536DEST_PATH_IMAGE025
Comprises the following steps:
Figure 524865DEST_PATH_IMAGE026
in the formula (I), the compound is shown in the specification,
Figure 48250DEST_PATH_IMAGE027
predicting power for each partitioned bus load,
Figure 946936DEST_PATH_IMAGE028
the total amount of the power generation and utilization imbalance of each subarea is calculated.
6. The safety check method for regional power grid power generation according to claim 1, wherein 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 comprises:
deviation between future power flow and planned value of each sub-region
Figure 188561DEST_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 the method specifically comprises the following steps:
Figure 526002DEST_PATH_IMAGE030
wherein, the first and the second end of the pipe are connected with each other,sis the number of each sub-area,
Figure 903894DEST_PATH_IMAGE031
in order to balance the coefficients of the process,
Figure 239060DEST_PATH_IMAGE032
is a directional coefficient;
Figure 499140DEST_PATH_IMAGE033
and
Figure 843534DEST_PATH_IMAGE034
are respectively the firstrFuture power flows and unit plans for individual units,
Figure 75932DEST_PATH_IMAGE035
and
Figure 582000DEST_PATH_IMAGE036
are respectively the firstiThe incoming tidal current value and the projected value of each AC link,Lthe number of ac links.
7. A safety check system for regional power grid power generation and utilization is characterized by 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 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 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.
8. The system according to claim 7, wherein in the calculation module, the method for calculating the total amount of the 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, 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.
9. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the safety check method for power generation of regional power grids according to any one of claims 1 to 6.
10. 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 regional power grid power generation according to any one of claims 1 to 6.
CN202211472924.2A 2022-11-23 2022-11-23 Safety check method, system, equipment and medium for power generation and utilization of regional power grid Active CN115513952B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211472924.2A CN115513952B (en) 2022-11-23 2022-11-23 Safety check method, system, equipment and medium for power generation and utilization of regional power grid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211472924.2A CN115513952B (en) 2022-11-23 2022-11-23 Safety check method, system, equipment and medium for power generation and utilization of regional power grid

Publications (2)

Publication Number Publication Date
CN115513952A true CN115513952A (en) 2022-12-23
CN115513952B CN115513952B (en) 2023-02-28

Family

ID=84513583

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211472924.2A Active CN115513952B (en) 2022-11-23 2022-11-23 Safety check method, system, equipment and medium for power generation and utilization of regional power grid

Country Status (1)

Country Link
CN (1) CN115513952B (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103345713A (en) * 2013-06-24 2013-10-09 国家电网公司 Method for designing super-large scale power network synchronization security correction system
CN104218569A (en) * 2014-08-15 2014-12-17 国家电网公司 Evaluative analysis method for static security check of large-scaled power grid
WO2018049737A1 (en) * 2016-09-18 2018-03-22 国电南瑞科技股份有限公司 Safe correction calculation method based on partition load control
CN112381401A (en) * 2020-11-13 2021-02-19 中国南方电网有限责任公司 Power market power generation dispatching plan safety checking method
CN115310142A (en) * 2022-08-04 2022-11-08 中国电力科学研究院有限公司 Method, system, equipment and medium for verifying safety verification data of regional power grid

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103345713A (en) * 2013-06-24 2013-10-09 国家电网公司 Method for designing super-large scale power network synchronization security correction system
CN104218569A (en) * 2014-08-15 2014-12-17 国家电网公司 Evaluative analysis method for static security check of large-scaled power grid
WO2018049737A1 (en) * 2016-09-18 2018-03-22 国电南瑞科技股份有限公司 Safe correction calculation method based on partition load control
CN112381401A (en) * 2020-11-13 2021-02-19 中国南方电网有限责任公司 Power market power generation dispatching plan safety checking method
CN115310142A (en) * 2022-08-04 2022-11-08 中国电力科学研究院有限公司 Method, system, equipment and medium for verifying safety verification data of regional power grid

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PUXIN SHI 等: ""Security check method of Regional Power Grid in Market Environment"", 《2021 INTERNATIONAL CONFERENCE ON POWER SYSTEM TECHNOLOGY (POWERCON)》 *
吕颖等: "智能电网调度控制系统的安全校核服务及实用化关键技术", 《电力系统自动化》 *

Also Published As

Publication number Publication date
CN115513952B (en) 2023-02-28

Similar Documents

Publication Publication Date Title
Ji et al. An enhanced SOCP-based method for feeder load balancing using the multi-terminal soft open point in active distribution networks
Coelho et al. Small-signal analysis of the microgrid secondary control considering a communication time delay
Li et al. Optimal operation of soft open points in active distribution networks under three-phase unbalanced conditions
CN104011959B (en) Method For Active Control Of Frequency And Voltage In A Power Supply Grid With Decentralized Power Supply Systems
CN107221945B (en) A kind of UHVDC Transmission Lines forecast failure aid decision-making method and device
CN110380450B (en) Photovoltaic control method, device, equipment and computer readable storage medium
CN109149595B (en) Phase modulator and extra-high voltage direct current converter station voltage reactive power coordination control method and system
CN103501004B (en) The progress control method of a kind of power distribution network and device
CN109687497B (en) Prevention control method and system for inhibiting extra-high voltage direct current continuous commutation failure
CN109787240B (en) Main and distribution network coordinated distributed power flow optimization method and related equipment
CN110556853B (en) Calculation method and system for providing initial value for electromagnetic transient simulation
Rivera et al. A multi-agent system transient stability platform for resilient self-healing operation of multiple microgrids
CN110365019B (en) Multi-terminal direct-current power distribution network converter capacity configuration method and system
Yang et al. Primal-dual subgradient algorithm for distributed constraint optimization over unbalanced digraphs
Naveed et al. Impact of load sharing schemes on the stability delay margins computed by Rekasius substitution method in load frequency control system with electric vehicles aggregator
CN113890039B (en) Multi-terminal flexible direct-current power distribution network power flow scheduling optimization method
Liu et al. Distributed real-time multi-objective control of a virtual power plant in dc distribution systems
CN112994050B (en) Method and device for treating station area unbalance based on standard deviation degree
CN115513952B (en) Safety check method, system, equipment and medium for power generation and utilization of regional power grid
Nigam et al. Controller hardware in the loop testing of microgrid secondary frequency control schemes
CN110649652B (en) New energy sending-out system phase modulator configuration method and device based on risk quantitative evaluation
CN110829448A (en) Distributed voltage interactive support control method and system for alternating current-direct current hybrid power distribution network
Zhang et al. Impact of dynamic load models on transient stability-constrained optimal power flow
CN112448417A (en) Coordination control method and system for new energy and thermal power binding direct current delivery system
CN111291939A (en) Method and system for planning links

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant