CN114759559B - Power grid stability limit analysis method - Google Patents

Power grid stability limit analysis method Download PDF

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CN114759559B
CN114759559B CN202210680094.6A CN202210680094A CN114759559B CN 114759559 B CN114759559 B CN 114759559B CN 202210680094 A CN202210680094 A CN 202210680094A CN 114759559 B CN114759559 B CN 114759559B
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power grid
limit
section
power
stability
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CN114759559A (en
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方绍凤
唐宇
周野
王昱
李娟�
胡剑宇
刘利黎
李静
冯剑
胡娟
张伊洁
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China Energy Engineering Group Hunan Electric Power Design Institute Co Ltd
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China Energy Engineering Group Hunan Electric Power Design Institute Co Ltd
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/04—Power grid distribution networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

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Abstract

The invention specifically discloses a power grid stability limit analysis method, which comprises the following steps: s1, determining risk faults corresponding to the power grid stability limit based on historical data of the existing power grid network frame; s2, analyzing influence factors of the risk fault corresponding to the power grid stability limit on the power grid section limit, and establishing a section limit judgment model based on the influence factors; s3, constructing a planning power grid, and comparing the structural difference between the planning power grid net rack and the existing power grid net rack; and S4, analyzing the influence of the influence factors on the stability limit of the planned power grid based on the structural difference between the planned power grid net rack and the existing power grid net rack and the power grid section limit judgment model according to stability judgment conditions and with the maximum section conveying capacity as a target. According to the method, the risk fault of the safe and stable operation limit of the power grid can be rapidly judged, and further theoretical support is provided for formulating a power grid stability control strategy.

Description

Power grid stability limit analysis method
Technical Field
The invention relates to the technical field of stability limits of new energy power systems, in particular to a power grid stability limit analysis method.
Background
With the access of large-scale new energy to the power grid, the power system needs to realize energy supply and demand balance between randomly fluctuating load demand and power supply, and the structural form, the operation control mode, the planning construction and the management of the power system will be fundamentally changed, so that the novel power system taking the new energy as the main body is formed. The characteristics of high proportion of new energy, high proportion of power electronization, low rotational inertia, double high and low, source-load uncertainty and low carbon requirements bring new requirements and new problems to the power grid structure and the operation mode. In view of the above, the method and the device analyze the influence of different influence factors on the stability limit of the power grid from the perspective of the system, and provide theoretical data support for formulating a power grid stability control strategy.
Disclosure of Invention
The invention aims to provide a power grid stability limit analysis method, which comprises the following steps:
s1, determining risk faults corresponding to the power grid stability limit based on historical data of the existing power grid network frame;
s2, analyzing influence factors of the risk fault corresponding to the power grid stability limit on the power grid section limit, and establishing a power grid section limit judgment model based on the influence factors;
s3, constructing a planning power grid, and comparing the structural difference between the planning power grid net rack and the existing power grid net rack;
and S4, analyzing the influence of the influence factors on the stability limit of the planned power grid based on the structural difference between the planned power grid net rack and the existing power grid net rack and the power grid section limit judgment model according to stability judgment conditions and with the maximum section conveying capacity as a target.
Preferably, the existing power grid and the planning power grid respectively comprise a power supply, a load, a power transmission channel, a transformer substation and a circuit, and the power supply comprises energy storage, wind power, photovoltaic, thermal power and hydropower.
Preferably, the specific implementation manner of step S1 includes:
s11, preliminarily determining the range of the power grid stability limit risk fault based on the historical data of the existing power grid network frame;
and S12, screening the preliminarily determined risk fault ranges one by one, and further acquiring the position of a risk fault point of the section receiving end power grid stability limit.
Preferably, the specific implementation manner of step S12 is: and aiming at the preliminarily determined risk fault range, screening the risk fault ranges one by one based on whether the existing power grid fault instability is caused and the screening conditions of the instability occurrence time and duration, and further acquiring the position of the risk fault point of the receiving-end power grid stability limit.
Preferably, the influencing factors of the grid section limit in step S2 include a power-on mode, a load level, a power output characteristic, a tie line power, a section transmission power flow and a safety control device.
Preferably, the power grid section limit determination model in step S2 is formulated as:
Figure 226223DEST_PATH_IMAGE001
wherein the content of the first and second substances,
Figure 454948DEST_PATH_IMAGE002
is shown as having
Figure 234685DEST_PATH_IMAGE003
The conditional section limit of each quota alternative value,
Figure 692211DEST_PATH_IMAGE004
is referred to as
Figure 506584DEST_PATH_IMAGE005
An influencing factor
Figure 329046DEST_PATH_IMAGE006
Obtained under the judgment condition of (1)
Figure 596079DEST_PATH_IMAGE003
A section quota option;
Figure 608029DEST_PATH_IMAGE007
the variable is represented by a number of variables,
Figure 276908DEST_PATH_IMAGE008
，
Figure 270271DEST_PATH_IMAGE009
、
Figure 24601DEST_PATH_IMAGE010
respectively represent influence factors
Figure 823930DEST_PATH_IMAGE006
Minimum and maximum values under the judgment conditions.
Preferably, the specific implementation manner of step S4 includes:
s41, judging stability based on the power grid section limit judgment model, and further establishing a section limit power optimization model containing a plurality of sections, wherein the section limit power optimization model is expressed by a formula as follows:
Figure 347315DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 777159DEST_PATH_IMAGE012
the number of key sections;
Figure 18785DEST_PATH_IMAGE013
is a section of
Figure 608422DEST_PATH_IMAGE014
A limiting power;
Figure 251893DEST_PATH_IMAGE015
is a section of
Figure 587060DEST_PATH_IMAGE014
A weighting factor for the limiting power;
Figure 378298DEST_PATH_IMAGE016
is a system safety and stability function;
Figure 457113DEST_PATH_IMAGE017
the maximum value of the safety and the stability which can be accepted by the system is obtained;
and S42, analyzing the influence of the influence factors on the stability limit of the power grid based on the section limit power optimization model and with the section conveying capacity as the maximum target.
According to the power grid stability limit analysis method provided by the invention, the influence of different influence factors on the power grid stability limit is analyzed from the system perspective, so that the risk fault of the power grid safety and stability operation limit can be rapidly judged, and a theoretical support is provided for formulating a power grid stability control strategy.
Drawings
Figure 1 is a flow chart of a grid stability limit analysis method of the present invention,
figure 2 is a schematic diagram of the structure of the power grid network in the south of the lake in the embodiment,
fig. 3 is a 500 kV-level tidal current diagram of the power grid in the south of the lake in the summer under the heavy load mode in the embodiment.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a method for analyzing stability limit of power grid includes the following steps:
s1, determining the risk fault corresponding to the power grid stability limit based on the historical data of the existing power grid network frame, and specifically comprising the following steps:
s11, preliminarily determining the range of the power grid stability limit risk fault based on the historical data of the existing power grid network frame;
s12, screening the preliminarily determined risk fault ranges one by one to further obtain the risk fault point position of the section receiving end power grid stability limit;
in the step, aiming at the preliminarily determined risk fault range, screening the risk fault ranges one by one based on whether the existing power grid fault instability is caused and the screening conditions of the instability occurrence time and duration so as to obtain the risk fault point position of the stability limit of the receiving-end power grid.
S2, analyzing influence factors of the risk fault corresponding to the power grid stability limit on the power grid section limit, and establishing a power grid section limit judgment model based on the influence factors, wherein the power grid section limit judgment model is expressed by a formula as follows:
Figure 955090DEST_PATH_IMAGE001
wherein the content of the first and second substances,
Figure 726737DEST_PATH_IMAGE002
is shown as having
Figure 490425DEST_PATH_IMAGE003
The conditional section limit of each quota alternative value,
Figure 372930DEST_PATH_IMAGE004
is referred to as
Figure 725414DEST_PATH_IMAGE005
An influencing factor
Figure 667962DEST_PATH_IMAGE006
Obtained under the judgment condition of (1)
Figure 168214DEST_PATH_IMAGE003
A section quota option;
Figure 588831DEST_PATH_IMAGE007
the variable is represented by a number of variables,
Figure 61400DEST_PATH_IMAGE008
，
Figure 486434DEST_PATH_IMAGE009
、
Figure 411665DEST_PATH_IMAGE010
respectively represent influence factors
Figure 635973DEST_PATH_IMAGE006
Minimum and maximum values under the judgment conditions.
In this step, the influencing factors of the power grid section limit include a starting mode, a load level, a power output characteristic, tie line power, a section transmission tide and a safety control device.
S3, constructing a planned power grid, and comparing the structural difference between the planned power grid net rack and the existing power grid net rack to judge whether the planned power grid net rack changes the structure of the existing power grid net rack so as to judge the original control strategy and the fault point causing the power grid stability;
s4, analyzing the influence of the influence factors on the stability limit of the planned power grid based on the structural difference between the planned power grid net rack and the existing power grid net rack and the power grid section limit judgment model by taking the maximum section conveying capacity as a target according to stability judgment conditions, and specifically comprising the following steps:
s41, judging stability based on the power grid section limit judgment model, and further establishing a section limit power optimization model containing a plurality of sections, wherein the section limit power optimization model is expressed by a formula as follows:
Figure 697470DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 44138DEST_PATH_IMAGE012
the number of key sections;
Figure 456664DEST_PATH_IMAGE013
is a section of
Figure 484663DEST_PATH_IMAGE014
A limiting power;
Figure 666246DEST_PATH_IMAGE015
is a section of
Figure 668968DEST_PATH_IMAGE014
A weighting factor for the limiting power;
Figure 568791DEST_PATH_IMAGE016
is a system safety and stability function;
Figure 134902DEST_PATH_IMAGE017
the maximum value of the safety and the stability which can be accepted by the system is obtained;
and S42, analyzing the influence of the influence factors on the stability limit of the power grid based on the section limit power optimization model and with the section conveying capacity as the maximum target.
In this embodiment, current electric wire netting and planning electric wire netting all include power, load, transmission of electricity passageway, transformer substation and circuit, the power includes energy storage, wind-powered electricity generation, photovoltaic, thermal power and water and electricity. The influence of different influence factors on the stability limit of the power grid is analyzed from the perspective of the system, so that the risk fault of the safety and stability operation limit of the power grid can be quickly judged, and theoretical data support is provided for formulating a power grid stability control strategy.
In order to further understand the working principle and technical effect of the invention, the following simulation description takes the Hunan power grid presenting the characteristic of 'West-east power transmission' as an example.
As shown in fig. 2 and fig. 3, fig. 2 shows a structure diagram of a network frame of the power grid in the south of the lake, and fig. 3 shows a 500 KV-level tidal current diagram of the power grid in the south of the lake in a summer heavy load mode.
In the embodiment, the existing power grid refers to a Hunan power grid before the autonomous State-Melothria West 500kV line engineering is put into production, the planning power grid refers to a Hunan power grid after the autonomous State-Melothria West 500kV line engineering is put into production, and the stability limit operation requirement of a key section of 'West electric east delivery' is analyzed based on the autonomous State-Melothria West 500kV line engineering after the autonomous State-Melothria West 500kV line engineering is put into production, so that the technical effect of the power grid stability limit analysis method provided by the invention is verified.
According to historical data, the following data are shown: under the conditions that a large amount of power is sent out in south Hunan province and thermal power generating units at load centers of east Hunan province and south Hunan province are few in startup, when a three-phase permanent fault occurs in the vicinity of a 500kV transformer substation in Cheng, the voltage instability of a permanent power grid of Chen in balance is caused, even the power angle instability of the whole power generating unit is further caused, and therefore the fault range causing the safety and stability limit risk of the existing power grid in Hunan province is determined;
screening the preliminarily determined fault ranges one by one so as to determine whether grid fault instability is caused; and analyzing the time and duration of the instability, and further obtaining fault points causing the safety and stability limit risk of the power grid at the receiving end of the section of the 'West-east Power Transmission'.
Based on the structural difference between the planned power grid network frame and the existing power grid network frame and according to stability judgment conditions, the influence of the influence factors on the stability limit of the power grid planned in Hunan of 'West-east Power Transmission' is analyzed by taking the maximum section conveying capacity as a target.
The section quota of the power grid operation is one of important boundary conditions of the safe and stable operation of the power grid, and the main purpose is that a dispatching department ensures that the trend of each important section does not exceed the stable quota according to safe and stable guiding rules and related requirements. The section limit mainly refers to the maximum value of the active power flow of the allowable section, and factors influencing the section limit are many in combination with the actual power grid operation condition, and the specific contents are as follows:
1) the load level. The load level can reflect the load condition of the power grid, and the operation mode can be adjusted according to different load levels, so that different control measures are adopted to obtain different section limits;
2) power supply output characteristics. In order to satisfy the real-time power balance relationship of the power system, the power output and the load level have a significant coupling relationship. The power output characteristics mainly refer to the starting and stopping state, the standby capacity and the output size of the unit, determine the tidal current distribution and the section limit of a power grid and influence the adjusting capacity of the unit in the transient recovery process;
3) tie line power. The transmission power of the links between different regions also affects the section limit;
4) and (5) the cross section conveys the tidal current. Adjacent sections may also have a constraining relationship. For example, the mutual restriction relationship between the first-level section (brilliant mountain red-brand double-circuit) and the second-level section (brand-long-yang-spread double-circuit, brilliant mountain red-parcel, autonomous state-queen-west) of the southwestern power grid and the third-level section (queen-west-folk double-circuit) of the southwestern power grid;
5) and a safety control device. When the system fails, the safety control system can perform control measures such as cutting machine, cutting load or splitting according to a preset strategy to control the limit of the section.
First, determining the risk fault corresponding to the power grid section stability limit in Hunan
Referring to the 500kV section stability regulation for 'West electric Dong Send' in Main network stability regulation (first edition) in China in 2020, under the normal mode, the sum of the power of the Pai Long (Pai Lou-Chang Yang shop) I and II loops and the power of the Yanzong (Yanshan hong-Zong Yuan) II loops does not exceed 2100MW under the restriction of 500kV three-phase short circuit fault in Hunan east; with the production of extra-high voltage and the increase of loads in Hunan, the overall stability level in Hunan is improved, and the stable calculation limit of 500kV section of 'West electric east transmission' before the production of 500kV lines from autonomous State to West Mongolian in 2022 is calculated to be about 2550 MW.
After the 500kV line is delivered from the autonomous State to the West of the Rou, through calculating the 500kV line fault of the Xiangdong looped network, comparison finds that under the same condition, the N-1 fault on the Ringling side of the 500kV line for changing Shaoshan to Ringling can cause system instability, in the embodiment, the N-1 fault on the Ringling side of the 500kV line for changing Shaoshan to Ringling is selected as a risk fault of the stable limit of the section of the 'West electric Dong delivery', and the specific selection of the risk fault is not repeated here.
Secondly, analyzing the stable limit condition of each influence factor after the administration of 500kV lines from the state of autonomous state to the west of Mongolia to the stable limit condition of the section of' east delivery of west Electricity
1) Influence of south Hunan province power supply group starting mode on power grid stability limit
The existing power grid in the southwest of Hunan has a total installed capacity of 3420MW of 500kV power supply, which comprises a Tuotkou (4 × 200 MW), a Tri-plate stream (4 × 250 MW), white city (3 × 140 MW) and a Qiandong power plant (2 × 600 MW). Except that a entrust hydropower station is connected into a brand building for 500kV change, other three-plate stream, white city and Qiandong power plants (hereinafter, referred to as south Hunan province power supply group) are connected into a 500kV Yanshan switching station, and 2620MW is installed in total; and analyzing the transmission capacity of a 'West electric and east electric' channel and the safety and stability level of a power grid based on the starting mode of the power supply. The simulation process mainly adopts BPA software to perform transient stability calculation analysis, and the specific calculation results are shown in the table 1:
TABLE 1 influence of power on mode on stability limit of "West electric Dong Send" section
Figure 498887DEST_PATH_IMAGE018
From the results in Table 1, it can be seen that: the more the opening of the support port is, the larger the promotion of the stability limit of the system is seen by comparing the stability limit of the 500kV section under the opening mode of the support port.
2) Influence of 'West electric and east electric' 500kV/220kV channel tide on power grid stability limit
According to calculation, the method can be based on a summer flattening mode of 2023 years, and the distribution and stability limits of a 500kV line flow + (copper bay-Pinxi + Qiancheng-Pinxi + flying mountain-Suning) section (section A, Wenyun-autonomous state + archway-Changyang Shuanghui + Yangshan-Zongyuan) after 500kV line casting of Wenyun (Uyu-autonomous state + Tokyo-Changyang-Yang Shuanghui + Yangshan-Zongyuan) are analyzed, and the calculation results are shown in tables 2 and 3, wherein the 220kV section is the sum of Suiyu-Shanxi, Huangping-Taohuajiang, Guanyin pavilion-Tunji, Guangyang-Cheng pond, Cuwan-Pinxi, Qianchun-Pingxi and Feishan-Changning power; the 220kV section open loop only refers to the open loop of yellow seedling terrace-Shanju, yellow seedling terrace-Taohuajiang, Guanyin pavilion-gang and Guanyin pavilion-goose pond.
Influence of 2500 kV channel on stability limit of 'West electric east transport' section
Figure 859461DEST_PATH_IMAGE020
TABLE 3220 kV channel influence on "West electric Dong Send" section stability limit
Figure 246580DEST_PATH_IMAGE022
From the results of tables 2 and 3, it can be seen that: compared with the transmission power flow of the 500kV section in different modes, the stability limit of the 500kV section after the project is put into operation is increased by about 309MW compared with that before the project is put into operation; the power grid stability limit of the 220kV section closed loop is reduced by about 474MW compared with that of the open loop.
By combining the above analysis, the stable limit of the 'West electric and east electric' section is influenced, and the starting condition of a power station with a support port is mainly existed
Figure 616381DEST_PATH_IMAGE023
500kV power transmission channel
Figure 821491DEST_PATH_IMAGE024
220kV line open-close loop operation mode
Figure 618546DEST_PATH_IMAGE025
。
If only the power station starting at the support port is considered
Figure 227382DEST_PATH_IMAGE023
In the case of the situation described above,
Figure 463191DEST_PATH_IMAGE027
if only 500kV power transmission channel before and after marco production is considered
Figure 473872DEST_PATH_IMAGE028
In the case of the situation described above,
Figure 441828DEST_PATH_IMAGE029
if only 200kV line open-close loop operation mode is considered
Figure 537960DEST_PATH_IMAGE025
In the case of the situation described above,
Figure DEST_PATH_IMAGE030
the details are shown in the table.
Figure 62614DEST_PATH_IMAGE031
In summary, the power grid stability limit analysis method provided by the invention analyzes the influence of the influence factors such as load level, power output characteristics, tie line power, section transmission flow and the like on the section stability limit of the power grid in south of Hunan of 'West-east Power Transmission', can solve the problem of limited transmission capacity of the existing 'West-east Power Transmission', and simultaneously provides a theoretical basis for subsequent planning of a power grid target network frame and power supply construction.
The method for analyzing the stability limit of the power grid provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (6)

1. A method for analyzing stability limits of a power grid, the method comprising the steps of:
s1, determining risk faults corresponding to the power grid stability limit based on historical data of the existing and operating power grid racks before the line engineering is put into production;
s2, analyzing influence factors of the risk fault corresponding to the power grid stability limit on the power grid section limit, and establishing a power grid section limit judgment model based on the influence factors, wherein the power grid section limit judgment model is expressed by a formula as follows:
Figure 242316DEST_PATH_IMAGE001
wherein the content of the first and second substances,
Figure 520851DEST_PATH_IMAGE002
is shown as having
Figure 983449DEST_PATH_IMAGE003
The conditional section limit of each quota alternative value,
Figure 804775DEST_PATH_IMAGE004
is referred to as
Figure 75219DEST_PATH_IMAGE005
An influencing factor
Figure 591782DEST_PATH_IMAGE006
Is obtained under the judgment condition of (1)
Figure 340296DEST_PATH_IMAGE003
A section quota option;
Figure 281707DEST_PATH_IMAGE007
the variable is represented by a number of variables,
Figure 972320DEST_PATH_IMAGE008
，
Figure 366392DEST_PATH_IMAGE009
、
Figure 653017DEST_PATH_IMAGE010
respectively represent influence factors
Figure 58722DEST_PATH_IMAGE006
A minimum value and a maximum value under a judgment condition;
s3, constructing a power grid after the line engineering planning and delivery, and comparing the structural difference between the power grid net rack after the line engineering planning and the power grid net rack which exists and operates before the line engineering delivery;
and S4, analyzing the influence of the influence factors on the power grid stability limit after the line engineering planning is put into operation according to the maximum section conveying capacity and the stability judgment condition based on the structural difference between the power grid net rack after the line engineering planning is put into operation and the existing and operating power grid net rack before the line engineering is put into operation and a power grid section limit judgment model.
2. The grid stability limit analysis method of claim 1, wherein the existing and operational grid before line engineering commissioning and the grid after line engineering planning commissioning both comprise power sources, including energy storage, wind power, photovoltaic, thermal power, and hydroelectric, loads, transmission channels, substations, and lines.
3. The grid stability limit analysis method according to claim 2, wherein the specific implementation manner of the step S1 includes:
s11, preliminarily determining the range of the power grid stability limit risk fault based on the historical data of the existing and operating power grid network frame before the line engineering is put into production;
and S12, screening the preliminarily determined risk fault ranges one by one, and further acquiring the position of a risk fault point of the section receiving end power grid stability limit.
4. The power grid stability limit analysis method according to claim 3, wherein the specific implementation manner of the step S12 is as follows: and aiming at the preliminarily determined risk fault range, screening the risk fault range one by one based on whether existing and running power grid fault instability before line engineering production and screening conditions of instability occurrence time and duration are caused, and further acquiring the risk fault point position of the stability limit of the receiving-end power grid.
5. The grid stability limit analysis method according to claim 4, wherein the influencing factors of the grid section limit in the step S2 include a startup mode, a load level, a power output characteristic, a tie line power, a section transmission power flow and a safety control device.
6. The grid stability limit analysis method according to claim 5, wherein the specific implementation manner of the step S4 includes:
s41, judging stability based on the power grid section limit judgment model, and further establishing a section limit power optimization model containing a plurality of sections, wherein the section limit power optimization model is expressed by a formula as follows:
Figure DEST_PATH_IMAGE011
in the formula (I), the compound is shown in the specification,
Figure 139810DEST_PATH_IMAGE012
the number of key sections;
Figure DEST_PATH_IMAGE013
is a section of
Figure 460326DEST_PATH_IMAGE014
A limit power;
Figure DEST_PATH_IMAGE015
is a section of
Figure 35795DEST_PATH_IMAGE014
A weighting factor for the limiting power;
Figure 545274DEST_PATH_IMAGE016
is a system safety and stability function;
Figure DEST_PATH_IMAGE017
for the system to acceptA fully stable maximum;
and S42, analyzing the influence of the influence factors on the stability limit of the power grid based on the section limit power optimization model and with the section conveying capacity as the maximum target.
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