CN110363678B - Power transmission and distribution network coordination planning method considering strength relation - Google Patents

Power transmission and distribution network coordination planning method considering strength relation Download PDF

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CN110363678B
CN110363678B CN201910456739.6A CN201910456739A CN110363678B CN 110363678 B CN110363678 B CN 110363678B CN 201910456739 A CN201910456739 A CN 201910456739A CN 110363678 B CN110363678 B CN 110363678B
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CN110363678A (en
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刘巨
李梦颖
杨东俊
杜治
赵红生
王博
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State Grid Corp of China SGCC
Wuhan Power Supply Co of State Grid Hubei Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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State Grid Corp of China SGCC
Wuhan Power Supply Co of State Grid Hubei Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Hubei Electric Power Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • 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
    • 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

Abstract

A coordinated planning method for power transmission and distribution networks considering the strength relationship comprises the steps of establishing an electric distance matrix S in which 500 kV nodes in a power network to be planned are connected through a power network with voltage levels of 220 kV and below, carrying out region division on the 500 kV nodes by adopting a cluster analysis method by combining with a power network partition basic principle, judging the strength levels of the 500 kV nodes according to the short-circuit current of the 500 kV nodes, and finally carrying out 220 kV power network planning on the strength levels of the 500 kV nodes in different regions. The design not only improves the power supply reliability and safety of the power grid, but also is beneficial to improving the operation efficiency of the power transmission and distribution network and avoiding the transitional investment construction of the power grid.

Description

Power transmission and distribution network coordination planning method considering strength relation
Technical Field
The invention belongs to the field of power systems, and particularly relates to a power transmission and distribution network coordination planning method considering the relation between the strength and the weakness of power grids of various voltage classes.
Background
The scientific and reasonable power grid planning technology is a precondition for ensuring the safety, reliability and economy of the power system. As the economy of China enters a new normal state, the development of the power grid of China shifts from a high-speed development period to a high-quality development period, and the power grid planning needs to use good stocks to keep inventory and increment so as to fully exert the power transmission and distribution network capacity of the power grid. In practice, people generally adopt a strategy of hierarchically planning each voltage class system, and plan power grids with different voltage classes by adopting different methods, such as documents: a grid planning method for power transmission and distribution coordination (hydroelectric power science, 2016 (34 (9): 200-204), evaluation indexes and planning methods for main network and power distribution network coordination planning (power system automation, 2010, 34 (15): 37-41) start from the main network and distribution network coordination evaluation indexes, and a main network and distribution network planning method is provided, so that coordination between economy and reliability in the main network and distribution network planning process is achieved. Because the power grids with different voltage grades are closely connected and the power transmission and distribution networks are mutually restricted, the power transmission and distribution network capacity of the power grid is difficult to be fully exerted by adopting a plan of hierarchically planning each voltage grade system and less considering the coordination among the power transmission and distribution networks.
Disclosure of Invention
The invention aims to provide a power transmission and distribution network coordination planning method considering the relation of strength and weakness, which can improve the operation reliability and safety of a power grid and reduce the construction cost of the power grid, aiming at the problems in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a power transmission and distribution network coordination planning method considering the strength relation sequentially comprises the following steps:
step A, establishing an electrical distance matrix S of 500 kV nodes in a power grid to be planned, which are connected through the power grid with voltage levels of 220 kV and below;
b, performing region division on 500 kV nodes in the power grid to be planned by adopting a cluster analysis method according to the electric distance matrix S and the basic principle of power grid partition, and judging the strength grade according to the short-circuit current of the 500 kV nodes;
and C, planning a 220 KV power grid according to the strength grade of the 500 KV node in different areas.
In step B, the area division sequentially includes the following steps:
b1, establishing an attraction degree matrix R and an attribution degree matrix A between 500 kilovolt nodes in the power network to be planned:
Figure BDA0002076836770000021
Figure BDA0002076836770000022
/>
in the above formula, R ij The attraction to the node j when clustering with the node i as the center, A ij When the node i is used as a center for clustering, the attribution degree of the node j to the node i is i =1,2, \ 8230, N, j =1,2, \ 8230, and N are the number of 500 kilovolt nodes in a to-be-planned power grid;
b2, performing iterative updating of the attraction degree matrix R and the attribution degree matrix A according to the following rules:
when i ≠ j, then,
Figure BDA0002076836770000023
Figure BDA0002076836770000024
when the ratio of i = j is greater than or equal to j,
Figure BDA0002076836770000025
Figure BDA0002076836770000026
in the above formula, S ij Is an element in the electrical distance matrix S, representing the relative electrical distance between node i and node j, and t is R ij 、S ij λ is the iterative attenuation coefficient, i =1,2, \8230, N, i '=1,2, \8230, N, j' =1,2, \8230, N;
step B3, determining the central node j of the clustering according to the following formula * ：
j * Z＝argmax j (A ij +R ij )
In the above formula, if i = j, the node i is the clustering center of the cluster, and if i ≠ j, the node j is the clustering center of the cluster, i =1,2, \ 8230, N, j =1,2, \ 8230, N;
step B4, circularly repeating the step B2 and the step B3 to continuously iterate, and outputting a clustering result when the result of continuous iteration is kept unchanged or reaches the maximum iteration times;
and B5, performing region division on 500 kV nodes in the power grid to be planned according to the clustering result and the partition basic principle that at least 3 500 kV main transformers of the power grid independently operate in a partitioned mode.
In the step B, the judging of the level of the short-circuit current according to the magnitude of the short-circuit current of the 500 kv node means:
calculating the short-circuit current of each 500 KV node in the power grid to be planned in a system large-load operation mode, if the short-circuit current of a certain node and the rated breaking current of the node switch meet the following relation, judging the node to be a strong node, and if not, judging the node to be a weak node:
Figure BDA0002076836770000031
in the above formula, I i Is a short-circuit current of node I Ni The rated breaking current of the node i switch.
The step C comprises the following steps in sequence:
c1, disconnecting links among the regions according to the region division result obtained in the step B to form a plurality of regional power grids;
step C2, determining conditions of newly increased 220 KV nodes and transformers in the region according to load development of power grids in each region and site selection conditions of the transformer substation;
and C3, increasing lines among all substations in the regional power grid according to the requirements of the regional power grid.
The step C3 is as follows:
if all 500 kV nodes in the regional power grid are weak nodes, increasing a line from a newly increased 220 kV station to a 220 kV bus of the 500 kV node when the 220 kV station is newly increased in the region, and enhancing 220 kV electrical connection between the 500 kV nodes;
if all 500 kV nodes in the regional power grid are strong nodes, when a 220 kV station is newly added in the region, the station is connected to other 220 kV substations far away from the 500 kV nodes through lines, and 220 kV electrical connection among the 500 kV nodes is not increased;
if the 500 kV nodes in the regional power grid have strong nodes and weak nodes, when a 220 kV station is newly added in the region, the node is connected to the 500 kV weak node side through a line, and the load flow crossing of the 220 kV power grid is weakened.
The step A sequentially comprises the following steps:
a1, deleting 500 kV and above voltage level electrical contact equipment positioned between 500 kV nodes in a power grid to be planned, and establishing an admittance matrix Y between the nodes:
Figure BDA0002076836770000041
Figure BDA0002076836770000042
Figure BDA0002076836770000043
Figure BDA0002076836770000044
Figure BDA0002076836770000045
in the above formula, when i ≠ j, Y ij For transadmittance between node i and node j, when i = j, Y ij The method comprises the following steps of obtaining self-admittance of a node i, wherein i =1,2, \8230, K, j =1,2, \8230, K and K are the total number of voltage level nodes of 500 kilovolts and below in a power grid to be planned, and M is the number of voltage level nodes of 220 kilovolts and below in the power grid to be planned;
step A2, eliminating nodes of 220 kilovolt and the following voltage levels through matrix transformation to obtain an admittance matrix YY between 500 kilovolt nodes:
Figure BDA0002076836770000046
step A3, calculating an electrical distance matrix S between all nodes according to the admittance matrix YY:
Figure BDA0002076836770000047
Figure BDA0002076836770000051
in the above formula, when i ≠ j, Z ij Is the transfer impedance between node i and node j, S ij Is the relative electrical distance between node i and node j, when i = j, Z ij Is the self-impedance of node i, S ij I =1,2, \ 8230, N, j =1,2, \ 8230, N, a reference electrical distance for node i.
Compared with the prior art, the invention has the following beneficial effects:
the invention relates to a power transmission and distribution network coordination planning method considering the relationship between strength and weakness, which comprises the steps of establishing an electric distance matrix S in which 500 kV nodes in a power network to be planned are connected through a 220 kV and below voltage level power network, combining a power network partition basic principle, adopting a clustering analysis method to perform regional division on the 500 kV nodes, judging the strength and weakness level of the 500 kV nodes according to the short-circuit current of the 500 kV nodes, and finally performing 220 kV power network planning on the strength and weakness level of the 500 kV nodes in different regions. Therefore, the invention not only improves the power supply reliability and safety of the power grid, but also is beneficial to improving the operation efficiency of the power transmission and distribution network and avoiding the transitional investment construction of the power grid.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of grid structures of 220 kv and 500 kv of the power grid according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a division result of 500 kv node areas of the power grid according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a grid structure of the power grid after coordination planning in embodiment 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Referring to fig. 1, a power transmission and distribution network coordination planning method considering the strength relationship sequentially includes the following steps:
step A, establishing an electrical distance matrix S of 500 kV nodes in a power grid to be planned, which are connected through the power grid with voltage levels of 220 kV and below;
b, performing region division on 500 kV nodes in the power grid to be planned by adopting a cluster analysis method according to the electric distance matrix S and the basic principle of power grid partition, and judging the strength grade according to the short-circuit current of the 500 kV nodes;
and step C, planning a 220 KV power grid according to the strength grade of the 500 KV node in different areas.
In step B, the area division sequentially includes the following steps:
b1, establishing an attraction degree matrix R and an attribution degree matrix A between 500 kilovolt nodes in the power network to be planned:
Figure BDA0002076836770000061
Figure BDA0002076836770000062
in the above formula, R ij The attraction to the node j when clustering with the node i as the center, A ij When the node i is used as a center for clustering, the attribution degree of the node j to the node i is i =1,2, \ 8230, N, j =1,2, \ 8230, and N are the number of 500 kilovolt nodes in a to-be-planned power grid;
b2, performing iterative updating of the attraction degree matrix R and the attribution degree matrix A according to the following rules:
when i ≠ j, then,
Figure BDA0002076836770000063
Figure BDA0002076836770000064
when i = j, the number of the bits is increased,
Figure BDA0002076836770000065
Figure BDA0002076836770000066
in the above formula, S ij Is an element in the electrical distance matrix S and represents the relative electrical distance between the node i and the node j, and t is R ij 、S ij λ is the iterative attenuation coefficient, i =1,2, \8230, N, i '=1,2, N, j =1,2, \8230, N, j' =1,2, \8230, N;
step B3,Determining a central node j of the cluster according to the following formula * ：
j * ＝argmax j (A ij +R ij )
In the above formula, if i = j, the node i is the clustering center of the cluster, and if i ≠ j, the node j is the clustering center of the cluster, i =1,2, \ 8230, N, j =1,2, \ 8230, N;
step B4, circularly repeating the step B2 and the step B3 to continuously iterate, and outputting a clustering result when the result of continuous iteration is kept unchanged or reaches the maximum iteration times;
and B5, performing region division on 500 kV nodes in the power grid to be planned according to the clustering result and the partition basic principle that at least 3 500 kV main transformers of the power grid independently operate in a partitioned mode.
In the step B, the judging of the level of the short-circuit current according to the magnitude of the short-circuit current of the 500 kv node means:
calculating the short-circuit current of each 500 KV node in the power grid to be planned in a system large-load operation mode, if the short-circuit current of a certain node and the rated breaking current of the node switch meet the following relation, judging the node to be a strong node, and if not, judging the node to be a weak node:
Figure BDA0002076836770000071
in the above formula, I i Is a short-circuit current of node I Ni The rated breaking current of the node i switch.
The step C comprises the following steps in sequence:
c1, disconnecting links among the regions according to the region division result obtained in the step B to form a plurality of regional power grids;
step C2, determining conditions of newly-added 220 KV nodes and transformers in the regions according to load development of power grids in each region and site selection conditions of the transformer substation;
and C3, increasing lines among all substations in the regional power grid according to the requirements of the regional power grid.
The step C3 is as follows:
if all 500 kV nodes in the regional power grid are weak nodes, increasing a line from a newly increased 220 kV station to a 220 kV bus of the 500 kV node when the 220 kV station is newly increased in the region, and enhancing 220 kV electrical connection between the 500 kV nodes;
if all 500 kV nodes in the regional power grid are strong nodes, when a 220 kV station is newly added in the region, the station is connected to other 220 kV substations far away from the 500 kV nodes through lines, and 220 kV electrical connection among the 500 kV nodes is not increased;
if the 500 kV nodes in the regional power grid have strong nodes and weak nodes, when a 220 kV station is newly added in the region, the 500 kV weak nodes are connected through lines, and the current crossing of the 220 kV power grid is weakened.
The step A sequentially comprises the following steps:
step A1, deleting 500 kV and above voltage level electrical contact equipment positioned between 500 kV nodes in a power grid to be planned, and establishing an admittance matrix Y between the nodes:
Figure BDA0002076836770000081
Figure BDA0002076836770000082
Figure BDA0002076836770000083
Figure BDA0002076836770000084
/>
Figure BDA0002076836770000085
in the above formula, when i ≠ j, Y ij For transadmittance between node i and node j, when i = j, Y ij The method comprises the following steps of obtaining self-admittance of a node i, wherein i =1,2, \8230, K, j =1,2, \8230, K and K are the total number of voltage level nodes of 500 kilovolts and below in a power grid to be planned, and M is the number of voltage level nodes of 220 kilovolts and below in the power grid to be planned;
step A2, eliminating nodes with voltage levels of 220 kilovolts and below through matrix transformation to obtain an admittance matrix YY between 500 kilovolt nodes:
Figure BDA0002076836770000086
step A3, calculating an electrical distance matrix S between each node according to the admittance matrix YY:
Figure BDA0002076836770000087
Figure BDA0002076836770000091
in the above formula, when i ≠ j, Z ij Is the transfer impedance between node i and node j, S ij Is the relative electrical distance between node i and node j, when i = j, Z ij Is the self-impedance of node i, S ij I =1,2, \ 8230, N, j =1,2, \ 8230, N, a reference electrical distance for node i.
The principle of the invention is illustrated as follows:
the invention provides a power transmission and distribution network coordination planning method considering the strong and weak relationship, which comprises the steps of firstly establishing an electric distance matrix of a power grid 500 kilovolt node connected through a 220 kilovolt and below voltage level power grid, then adopting a clustering analysis method to partition the 500 kilovolt node by combining with a power grid partition basic principle, then judging the strong and weak relationship by calculating the short-circuit current of the 500 kilovolt node, and finally adopting different principles to realize the power transmission and distribution network coordination planning aiming at the strong and weak relationship combination among the 500 kilovolt nodes in different regions. According to the method, through the strong and weak complementary relationship between the transmission network and the distribution network, not only can the high reliability of the power grid be guaranteed, but also the construction cost of the power grid can be reduced, and the simple, strong and orderly development of the power grid is promoted.
Example 1:
referring to fig. 1, a coordinated planning method for a transmission and distribution network considering a strength relationship is provided, where a certain power grid in China is used as an object (the power grid has 31 nodes, 5 500 kv nodes, 2 power plant nodes, 24 220 kv nodes, and a schematic grid structure diagram of the power grid is shown in fig. 2), and the method sequentially includes the following steps:
step 1, deleting 500 kV and above voltage level electrical contact equipment between 500 kV nodes in a power grid, and establishing an admittance matrix Y between the nodes:
Figure BDA0002076836770000092
Figure BDA0002076836770000093
Figure BDA0002076836770000094
Figure BDA0002076836770000101
Figure BDA0002076836770000102
in the above formula, when i ≠ j, Y ij For mutual admittance between node i and node j, Y when i = j ij The method comprises the following steps of obtaining self-admittance of a node i, wherein i =1,2, \8230, K, j =1,2, \8230, K and K are the total number of voltage level nodes of 500 kilovolts and below in a power grid to be planned, and M is the number of voltage level nodes of 220 kilovolts and below in the power grid to be planned;
and 2, eliminating nodes of 220 kilovolts and the following voltage levels through matrix transformation to obtain an admittance matrix YY among 500 kilovolt nodes (the numbers are respectively 1, 11, 16, 17 and 23):
Figure BDA0002076836770000103
the admittance matrix YY obtained in this example is:
Figure BDA0002076836770000104
step 3, calculating an electrical distance matrix S between each node according to the admittance matrix YY:
Figure BDA0002076836770000105
/>
Figure BDA0002076836770000106
in the above formula, when i ≠ j, Z ij Is the transfer impedance between node i and node j, S ij Is the relative electrical distance between node i and node j, when i = j, Z ij Is the self-impedance of node i, S ij I =1,2, \ 8230for a reference electrical distance of node i, N, j =1,2, \ 8230;
the electrical distance matrix S obtained in this embodiment is;
Figure BDA0002076836770000111
step 4, establishing an attraction degree matrix R and an attribution degree matrix A between 500 kilovolt nodes in the power network to be planned:
Figure BDA0002076836770000112
Figure BDA0002076836770000113
in the above formula, R ij The attraction degree to the node j when clustering is performed with the node i as the center, A ij When the node i is used as a center for clustering, the attribution degree of the node j to the node i is i =1,2, \ 8230, N, j =1,2, \ 8230, and N are the number of 500 kilovolt nodes in a to-be-planned power grid;
and 5, performing iterative updating of the attraction degree matrix R and the attribution degree matrix A according to the following rules:
when i ≠ j, then,
Figure BDA0002076836770000114
Figure BDA0002076836770000115
when the ratio of i = j is greater than or equal to j,
Figure BDA0002076836770000116
Figure BDA0002076836770000117
in the above formula, S ij Is an element in the electrical distance matrix S, representing the relative electrical distance between node i and node j, and t is R ij 、S ij λ is the iterative attenuation coefficient, i =1,2, \8230, N, i '=1,2, \8230, N, j' =1,2, \8230, N;
step 6, determining the central node j of the clustering according to the following formula * ：
j * Z＝argmax j (A ij +R ij )
In the above formula, if i = j, the node i is the clustering center of the cluster, and if i ≠ j, the node j is the clustering center of the cluster, i =1,2, \ 8230, N, j =1,2, \ 8230, N;
step 7, circularly repeating the step 5 and the step 6 to continuously iterate, and outputting a clustering result when the result of continuous iteration is kept unchanged or reaches the maximum iteration times;
step 8, performing area division on 500 kV nodes in the power grid to be planned according to the clustering result and the partition basic principle that at least 3 500 kV main transformers of the power grid operate separately in a partitioned mode, wherein the result is shown in fig. 3, lines 6-7, 4-14 and 6-19 need to be disconnected, 500 kV nodes 1 are 1, 500 kV nodes 11 are one, and 500 kV nodes 16, 17 and 23 are one;
step 9, calculating the short-circuit current of each 500 KV node in the power grid to be planned in a system large-load operation mode, if the short-circuit current of a certain node and the rated interrupt current of the node switch meet the following relation, judging the node to be a strong node, and if not, judging the node to be a weak node:
Figure BDA0002076836770000121
in the above formula, I i Short-circuit current of node I, I Ni Rated breaking current of a switch at a node i;
the strength grade determination result of the 500 kv node in this embodiment is shown in table 1:
TABLE 1 500 KV node short-circuit current and strong-weak characteristic table
Node numbering Short-circuit current (Qian' an) Interdiction current (Qian' an) Strength and weakness characteristics
1 62.4 63 Strong strength (S)
11 39.2 63 Weak (weak)
16 54.4 63 High strength
17 46.4 63 Weak (weak)
23 41.2 63 Weak (weak)
Step 10, disconnecting links among the regions according to the region division result obtained in the step 8 to form a plurality of region power grids;
step 11, determining conditions of newly increased 220 KV nodes and transformers in the areas according to load development of power grids in each area and site selection conditions of transformer substations;
step 12, increasing lines among all substations in the regional power grid according to the requirements of the regional power grid, specifically:
if all 500 kV nodes in the regional power grid are weak nodes, increasing a line from a newly increased 220 kV station to a 220 kV bus of the 500 kV node when the 220 kV station is newly increased in the region, and enhancing 220 kV electrical connection between the 500 kV nodes;
if all 500 kV nodes in the regional power grid are strong nodes, when a 220 kV station is newly added in the region, the station is connected to other 220 kV substations far away from the 500 kV nodes through lines, and 220 kV electrical connection among the 500 kV nodes is not increased;
if the 500 kV nodes in the regional power grid have strong nodes and weak nodes, when a 220 kV station is newly added in the region, the 500 kV weak nodes are connected through lines, and the tide crossing of the 220 kV power grid is weakened;
for a power grid in a partition where the node 1 is located, because the node is a strong node, the newly added station avoids outgoing lines from the node 1 as much as possible, and the newly added station is mainly connected to the node 2, the node 3, the node 5 and the node 6; for the subarea two-grid in which the node 11 is located, because the node is a weak node, lines of 11-g7 and 11-g8 are added to enhance 220 kV electrical contact when sites are newly added; for the three power grids of the subareas where the nodes 16, 17 and 23 are located, for the weak node 23, the outgoing lines 23-g1-20 and 23-g2-19 are added when the station is newly added, the electrical connection between the 220 kV power grid and the 500 kV node in the area is properly reinforced, for the strong node 16, the station g3 is newly added to be led out to the node 15 and the node 28, the direct outgoing line to the node 16 is avoided, and the coordinated and planned grid structure is shown in fig. 4.
In order to examine the effectiveness of the method, the power flow stability analysis is respectively carried out on the power grids before and after planning, and the power transfer conditions of the 500 kV line N-1 and the power grid after the same tower N-2 are shown in a table 2:
TABLE 2 electromagnetic crossing situation table for planning front and rear systems
Figure BDA0002076836770000131
From the data shown in table 2: the high-low voltage power flow transfer ratio existing between the node 1 and the node 11, between the node 1 and the node 16, between the node 17 and between the node 23 is reduced to 0% from 12.4% and 26.9%, namely the high-low voltage electromagnetic ring network existing between the node 1 and the node 11 and between the node 1 and the node 16, between the node 17 and between the nodes 23 is completely opened; meanwhile, the high-low voltage power flow transfer ratios originally existing between the node 16 and the node 17, between the node 16 and the node 23, and between the node 17 and the node 23 are reduced from 40.7%, 22.7% and 29.5% to 31.4%, 15.9% and 28.4%, namely, the high-low voltage electromagnetic ring network among the node 16, the node 17 and the node 23 is also relieved.
In conclusion, the method can weaken the problem of electromagnetic looped networks among power grids with different voltage levels, improve the power supply reliability and safety of the power grids, fully benefit power transmission and distribution equipment with various voltage levels, and facilitate the improvement of the operation efficiency of the power transmission and distribution network so as to avoid the transition investment construction of the power grids.

Claims (3)

1. A power transmission and distribution network coordination planning method considering the strength relationship is characterized in that:
the method comprises the following steps in sequence:
step A, establishing an electrical distance matrix S of 500 kV nodes in a power grid to be planned, which is connected through the power grid with 220 kV and the following voltage levels, and specifically sequentially comprising the following steps:
a1, deleting 500 kV and above voltage level electrical contact equipment positioned between 500 kV nodes in a power grid to be planned, and establishing an admittance matrix Y between the nodes:
Figure FDA0004036203890000011
Figure FDA0004036203890000012
Figure FDA0004036203890000013
Figure FDA0004036203890000014
Figure FDA0004036203890000015
in the above formula, when i ≠ j, Y ij For transadmittance between node i and node j, when i = j, Y ij The method is characterized in that self-admittance of a node i, i =1,2, \8230, K, j =1,2, \8230, K and K are the total number of voltage level nodes of 500 kilovolts and below in a power grid to be planned, and M is the number of voltage level nodes of 220 kilovolts and below in the power grid to be planned;
step A2, eliminating nodes with voltage levels of 220 kilovolts and below through matrix transformation to obtain an admittance matrix YY between 500 kilovolt nodes:
Figure FDA0004036203890000021
step A3, calculating an electrical distance matrix S between each node according to the admittance matrix YY:
Figure FDA0004036203890000022
/>
Figure FDA0004036203890000023
in the above formula, when i ≠ j, Z ij Is the transfer impedance between node i and node j, S ij Is the relative electrical distance between node i and node j, when i = j, Z ij Is the self-impedance of node i, S ij I =1,2, \ 8230for a reference electrical distance of node i, N, j =1,2, \ 8230;
and step B, according to the electric distance matrix S and the basic principle of power grid partition, performing region partition on 500 kV nodes in the power grid to be planned by adopting a cluster analysis method, and judging the strength and weakness grade of the 500 kV nodes according to the short circuit current of the 500 kV nodes, wherein the region partition sequentially comprises the following steps:
b1, establishing an attraction degree matrix R and an attribution degree matrix A between 500 kilovolt nodes in the power network to be planned:
Figure FDA0004036203890000024
Figure FDA0004036203890000025
in the above formula, R ij The attraction degree to the node j when clustering is performed with the node i as the center, A ij When the node i is used as a center for clustering, i =1,2, \8230forthe attribution degree of the node j, N, j =1,2, \8230, and N, N is the number of 500 KV nodes in the electric network to be planned;
b2, performing iterative updating of the attraction degree matrix R and the attribution degree matrix A according to the following rules:
when i ≠ j, then,
Figure FDA0004036203890000031
Figure FDA0004036203890000032
when i = j, the number of the bits is increased,
Figure FDA0004036203890000033
Figure FDA0004036203890000034
in the above formula, S ij Representing, for elements in the electrical distance matrix S, between nodes i and jRelative electrical distance, t is R ij 、S ij λ is the iterative attenuation coefficient, i =1,2, \8230, N, i '=1,2, \8230, N, j' =1,2, \8230, N;
and B3, determining a central node j of the clustering according to the following formula:
j*＝argmax j (A ij +R ij )
in the above formula, if i = j, the node i is the clustering center of the cluster, and if i ≠ j, the node j is the clustering center of the cluster, i =1,2, \ 8230, N, j =1,2, \ 8230, N;
step B4, circularly repeating the step B2 and the step B3 to continuously iterate, and outputting a clustering result when the result of continuous iteration is kept unchanged or reaches the maximum iteration times;
b5, performing region division on 500 kV nodes in the power grid to be planned according to the clustering result and the partition basic principle that at least 3 500 kV main transformers of the power grid independently operate in a partitioned mode;
the step of judging the strength grade according to the short-circuit current of the 500 KV node is as follows:
calculating the short-circuit current of each 500 kV node in the power network to be planned in a system large-load operation mode, if the short-circuit current of a certain node and the rated breaking current of the node switch meet the following relation, judging the node to be a strong node, and if not, judging the node to be a weak node:
Figure FDA0004036203890000035
in the above formula, I i Short-circuit current of node I, I Ni Rated breaking current of a switch at a node i;
and C, planning a 220 KV power grid according to the strength grade of the 500 KV node in different areas.
2. The power transmission and distribution network coordination planning method considering the strength relationship according to claim 1, characterized in that:
the step C comprises the following steps in sequence:
c1, disconnecting links among the regions according to the region division result obtained in the step B to form a plurality of regional power grids;
step C2, determining conditions of newly-added 220 KV nodes and transformers in the regions according to load development of power grids in each region and site selection conditions of the transformer substation;
and C3, increasing lines among all substations in the regional power grid according to the requirements of the regional power grid.
3. The power transmission and distribution network coordination planning method considering the strength relationship according to claim 2, characterized in that:
the step C3 is as follows:
if all 500 kV nodes in the regional power grid are weak nodes, increasing a line from a newly increased 220 kV station to a 220 kV bus of the 500 kV node when the 220 kV station is newly increased in the region, and enhancing 220 kV electrical connection between the 500 kV nodes;
if all 500 kV nodes in the regional power grid are strong nodes, when a 220 kV station is newly added in the region, the station is connected to other 220 kV substations far away from the 500 kV nodes through lines, and 220 kV electrical connection among the 500 kV nodes is not increased;
if the 500 kV nodes in the regional power grid have strong nodes and weak nodes, when a 220 kV station is newly added in the region, the 500 kV weak nodes are connected through lines, and the current crossing of the 220 kV power grid is weakened.
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