CN111181200B - Practical analysis method, device and system for power generation feasible region - Google Patents
Practical analysis method, device and system for power generation feasible region Download PDFInfo
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- CN111181200B CN111181200B CN202010101077.3A CN202010101077A CN111181200B CN 111181200 B CN111181200 B CN 111181200B CN 202010101077 A CN202010101077 A CN 202010101077A CN 111181200 B CN111181200 B CN 111181200B
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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
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Abstract
The invention discloses a practical analysis method, a practical analysis device and a practical analysis system for a power generation feasible region, wherein the practical analysis method comprises the steps of screening out all units in a region related to a dispatching plan; calculating the power sensitivity of the active power of each unit relative to a specific section; the power sensitivity and the geographical position of each unit are integrated, all the units in the area are grouped, and the group with the maximum power sensitivity is used as a leading generator group; constructing a frame of a power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate; determining an initial operation mode of a regional power grid according to the regional total load and the minimum value of the active power of the leading generator group; based on the initial operation mode of the regional power grid, under different load levels and different power generation output of the leading generator group, the operation mode of the regional power grid is adjusted by taking the critical safety of a specific section as constraint, and a power generation feasible region is constructed. The invention constructs a power generation feasible region aiming at a specific section and provides decision information for power generation arrangement of the regional unit.
Description
Technical Field
The invention belongs to the field of electric power system dispatching operation, and particularly relates to a practical analysis method, a practical analysis device and a practical analysis system for a power generation feasible region in dispatching plan safety check.
Background
From the time scale, the dispatch plan safety checks include long-term, medium-term, and short-term checks. At present, a lot of research reports are available for scheduling safety check before and in the day, but safety check of annual/monthly medium and long-term plans has large errors due to large time span, new energy output prediction, load prediction and the like, and intercourse exchange plans have large uncertainty and the like.
The core of the safety check of the dispatching plan is that the flow of the leading section is not out of limit. The existing method aims at all based on a deterministic scene when a power generation plan is arranged. The monthly plan has large time span and high uncertainty of power generation and output, and the purpose of checking is to complete the transaction of electric quantity, so that the monthly plan is not suitable for carrying out detailed safety check of the section tide.
Disclosure of Invention
Aiming at the problems, the invention provides a practical analysis method, a practical analysis device and a practical analysis system for a power generation feasible region, which are used for constructing the power generation feasible region aiming at a key blocking section and providing decision information for power generation arrangement of a unit in a region.
In order to achieve the technical purpose and achieve the technical effects, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a practical analysis method for a feasible power generation domain, including:
screening out all the units in the area related to the dispatching plan;
calculating the power sensitivity of the active power of each unit relative to a specific section;
the power sensitivity and the geographical position of each unit are integrated, all the units in the area are grouped, and the group with the maximum power sensitivity is used as a leading generator group;
constructing a frame of an initial power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate;
determining an initial operation mode of a regional power grid according to the regional total load and the minimum value of the active power of the leading generator group;
based on the initial operation mode of the regional power grid, under different load levels and different power generation output of the leading generator group, the operation mode of the regional power grid is adjusted by taking the critical safety of a specific section as constraint, and a power generation feasible region is constructed for power generation safety check.
Optionally, the calculation formula of the power sensitivity is as follows:
wherein, the first and the second end of the pipe are connected with each other,
indicating power sensitivity, P tie The active power of a specific section is shown,
and the active power of the ith generator in the unit is represented.
Optionally, the grouping of all the units in the area includes the following steps:
clustering each unit by adopting a K-means method according to the power sensitivity of each unit;
and adjusting the clustering result of the K-means method according to the geographical position of each unit, wherein the adjustment ensures that the units in the same area are divided into the same group to obtain a plurality of final clusters.
Optionally, the method for computing the master generator group includes:
calculating the active sensitivity of each cluster relative to a specific section
Wherein, the first and the second end of the pipe are connected with each other,
the power sensitivity of the fleet is indicated,
representing the total active power of the ith cluster;
all clusters are arranged from large to small according to power sensitivity and are sequentially C 1 ～C n Wherein n is the number of groups, C 1 The cluster is the leading generator cluster.
Optionally, the number of the clusters is 3; the method for determining the initial operation mode of the regional power grid comprises the following steps:
C 1 the output of each unit in the group is set as a set percentage value of the maximum output of each unit;
determining C by using the critical safety of the transmission power of a specific section as a constraint condition 2 Total output of the units in the group, wherein, if C 2 When all the units of the group are fully loaded, the specific section is not overloaded yet, and C is 2 The total output of the unit in the group is set to 100 percent;
determining C by taking power balance of power generation and load of the whole network as a constraint condition 3 And (4) determining the initial operation mode of the regional power grid by the total output of the units in the group.
Optionally, the method for determining the power generation feasible region comprises:
c under initial operation mode of fixed area power grid 2 Total output of the group unit, starting from the minimum load of the region, C 1 The group unit continuously increases the output on the basis of the output of the regional power grid in the initial operation mode, and simultaneously adjusts C according to the current load level of the whole grid 3 The total output of the group unit is up to the critical safety or critical out-of-limit of the specific section, and C is carried out 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load;
continuously increasing the area load, and calculating the critical safety C of the specific section under each specific load 1 Generating electrode limit of the group unit until the load is increased to the maximum load of the area;
and drawing a feasible power generation area of a leading generator group corresponding to the specific section in the regional power grid by taking the non-overrun area of the specific section as a safe area and the overrun area as an unsafe area.
In a second aspect, the present invention provides a power generation feasible region utility analysis apparatus, comprising:
the screening unit is used for screening out all the units in the area related to the dispatching plan;
the calculating unit is used for calculating the power sensitivity of the active power of each unit relative to a specific section;
the grouping unit is used for grouping all the units in the area by integrating the power sensitivity and the geographic position of each unit, and taking the group with the maximum power sensitivity as a leading generator group;
the first determining unit is used for constructing a frame of an initial power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate;
the second determining unit is used for determining the initial operation mode of the regional power grid according to the regional total load and the minimum value of the active power of the leading generator group;
and the construction unit is used for adjusting the operation mode of the regional power grid on the basis of the initial operation mode of the regional power grid and under different load levels and different power generation output of the leading generator group by taking the critical safety of a specific section as constraint so as to construct a power generation feasible region for power generation safety check.
Optionally, the method for computing the master generator group includes:
calculating the active sensitivity of each cluster relative to a specific section
Wherein the content of the first and second substances,
the power sensitivity of the fleet is indicated,
representing the total active power of the ith cluster;
all clusters are arranged from large to small according to power sensitivity and are sequentially C 1 ～C n Wherein n is the number of groups, C 1 The group is the leading generator group.
Optionally, the method for determining the power generation feasible region comprises:
c in initial operation mode of fixed area power grid 2 Total output of the group unit, starting from the minimum load of the region, C 1 The group unit continuously increases the output on the basis of the output of the regional power grid in the initial operation mode, and simultaneously adjusts C according to the current load level of the whole grid 3 The total output of the group unit is up to the critical safety or critical out-of-limit of the specific section, and C 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load;
continuously increasing the area load, and calculating the critical safety C of the specific section under each specific load 1 Generating electrode limit of the group unit until the load is increased to the maximum load of the area;
and drawing a feasible power generation area of a leading generator group corresponding to the specific section in the regional power grid by taking the non-overrun area of the specific section as a safe area and the overrun area as an unsafe area.
In a third aspect, the present invention provides a practical analysis system for a feasible power generation domain, including: a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of the first aspects.
Compared with the prior art, the invention has the beneficial effects that:
the invention covers the possible value of future load through the change interval of regional load, constructs the section flow leading unit power generation feasible region relative to the load, and can obtain the leading unit output interval limited by the section safety, thereby assisting the power generation arrangement of the decision-making unit and providing decision-making information for the power generation arrangement of the monthly unit.
Drawings
In order that the present disclosure may be more readily and clearly understood, reference is now made to the following detailed description of the present disclosure taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a flow chart of a power generation feasible region utility analysis method according to an embodiment of the present invention;
FIG. 2 is a provincial power grid unit clustering result of comprehensive sensitivity and geographic location;
FIG. 3 is a main fleet power generation feasible domain under a certain critical section safety constraint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
The application of the principles of the present invention will now be described in detail with reference to the accompanying drawings.
Example 1
The embodiment of the invention provides a practical analysis method for a feasible power generation domain, which comprises the following steps:
(1) screening out all the units in the area related to the dispatching plan;
(2) calculating the power sensitivity of the active power of each unit relative to a specific section;
(3) the power sensitivity and the geographical position of each unit are integrated, all the units in the area are grouped, and the group with the maximum power sensitivity is used as a leading generator group;
(4) constructing a frame of an initial power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate;
(5) determining an initial operation mode of a regional power grid according to the regional total load and the minimum value of the active power of the leading generator group;
(6) based on the initial operation mode of the regional power grid, under different load levels and different power generation output of the leading generator group, the operation mode of the regional power grid is adjusted by taking the critical safety of a specific section as constraint to construct a power generation feasible region for power generation safety check.
In a specific implementation manner of the embodiment of the present invention, the calculation formula of the power sensitivity is as follows:
wherein the content of the first and second substances,
indicating power sensitivity, P tie The active power of a specific section is shown,
and the active power of the ith generator in the unit is represented.
In a specific implementation manner of the embodiment of the present invention, the grouping all the units in the area includes the following steps:
clustering each unit by adopting a K-means method according to the power sensitivity of each unit;
adjusting the clustering result of the K-means method according to the geographical position of each unit, wherein the adjustment ensures that the units in the same area are divided into the same group to obtain a plurality of final groups; preferably, in the actual grouping process, the sensitivity of the unit relative to the section flow and the electrical distance between the unit and the sections are comprehensively considered.
In a specific implementation manner of the embodiment of the present invention, the method for calculating the dominant generator group includes:
calculating the active sensitivity of each cluster relative to a specific section
Wherein the content of the first and second substances,
the power sensitivity of the fleet is indicated,
representing the total active power of the ith cluster;
all clusters are arranged from large to small according to power sensitivity and are sequentially C 1 ～C n Wherein n is the number of groups, C 1 The cluster is the leading generator cluster.
In a specific implementation manner of the embodiment of the present invention, the number of the clusters is 3; the method for determining the initial operation mode of the regional power grid comprises the following steps:
C 1 the output of each unit in the group is set as a set percentage value of the maximum output of each unit;
determining C by using the critical safety of the transmission power of a specific section as a constraint condition 2 Total output of the units in the group, wherein, if C 2 When all the units of the group are fully loaded, the specific section is not overloaded yet, and C is 2 The total output of the unit in the group is set to 100 percent;
determining C by taking power balance of power generation and load of the whole network as a constraint condition 3 And (4) determining the initial operation mode of the regional power grid by the total output of the units in the group.
In a specific implementation manner of the embodiment of the present invention, the method for determining the power generation feasible region includes:
c in initial operation mode of fixed area power grid 2 Total output of the group unit, starting from the minimum load of the zone, C 1 Group unit inContinuously increasing output on the basis of output in the initial operation mode of the regional power grid, and simultaneously adjusting C according to the current load level of the whole grid 3 The total output of the group unit is up to the critical safety or critical out-of-limit of the specific section, and C is carried out 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load;
continuously increasing the area load, and calculating the critical safety C of the specific section under each specific load 1 Generating electrode limit of the group unit until the load is increased to the maximum load of the area;
and drawing a feasible power generation area of a leading generator group corresponding to the specific section in the regional power grid by taking the non-overrun area of the specific section as a safe area and the overrun area as an unsafe area.
The following describes the power generation feasible region practical analysis method in detail with reference to a specific example, and a specific flow of the power generation feasible region practical analysis method is shown in fig. 1.
Taking the provincial power grid (fig. 2) in a certain overhaul mode in month 6 as an example, the critical section (i.e. the specific section) is from ZG to DT, which is shown by a solid line, the power flow direction flows from ZG to DT, and the transmission power limit is 3000 MW. Considering the new energy in the power grid as negative load, the total equivalent load in the province in 6 months ranges from 19000MW to 27000 MW.
Step 1: firstly, the units of the power-saving network are classified according to a network dispatching unit and a master dispatching unit. Since the network dispatching unit is not in the provincial dispatching range, all the following analyses are only performed on the main dispatching unit, and are simply called as the unit. In fig. 2, beginning with G, the tuning units are all called tuning units.
Step 2: calculating the power sensitivity of the active power of the unit in the power-saving network relative to the critical section:
wherein the content of the first and second substances,
indicating power sensitivity, P tie The active power of the critical section is shown,
and the active power of the ith generator in the unit is represented. The results are shown in Table 1.
TABLE 1 active sensitivity of the unit with respect to critical section
And step 3: and integrating information of the two aspects of the sensitivity and the geographic position of the units, grouping all the units in the province, and defining the group with the maximum sensitivity as a leading generator group.
Specifically, firstly, clustering is carried out on the unit by adopting a K-means algorithm according to the sensitivity (absolute value) result of the unit. The K-means algorithm parameter values are as follows: the class number is 3, the iteration number is 100, and the initial centroid run number is 10. The initial classification result of the unit obtained by the method is shown as C in Table 1 10 ～C 30 。
As can be seen in connection with fig. 2: generator G 1 ～G 2 、G 4 All the units belong to HF areas and are to be divided into the same group, the HF areas can be in the HF city, referring to FIG. 2, the idea of correcting the groups according to the geographical positions is that the units in the same grade city are divided into the same group as much as possible, and the adjustment is carried out according to the electrical distance between each unit and the section; at the same time G 3 Has a sensitivity higher than G 4 If G is 4 Is classified in C 1 Group, then G 3 Also divided into C 1 (ii) a group; due to G 3 The electrical distance from the critical section is far more than G 9 If G is 3 Is classified in C 1 Group, then G 9 Should also be classified as C 1 (ii) a group; unit G 6 ～G 8 All have a sensitivity higher than G 9 At the same time due to G 10 ～G 11 And G 6 ～G 8 All belong to SH region, so G will be the last 1 ～G 4 、G 6 ～G 11 Is classified in C 1 And (4) clustering.
Although G is 5 Greater sensitivity, G 12 Sensitivity and G 10 ～G 11 Close but because of themAre all not C 1 The location of the units in the group is divided into two units 2 And (4) clustering. Combining the results of the K-means clustering to finally obtain G 5 、G 12 ～G 21 Is classified in C 2 And (4) clustering. C 3 The group is still the grouping result of the original K-means, including the unit G 22 ～G 33 . The final clustering results are shown in table 2.
All clusters are arranged from large to small according to sensitivity and are sequentially C 1 ～C 3 C to maximize sensitivity 1 The cluster is designated as the leading generator cluster. Recalculating cluster C 1 ～C 3 Active sensitivity to critical section
See table 2. Wherein the content of the first and second substances,
the power sensitivity of the fleet is indicated,
the total active power of the ith cluster is represented.
TABLE 2 Unit grouping, Total maximum output and sensitivity
And 4, step 4: and establishing a power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate, namely determining the coordinate and the range of the power generation feasible region. The abscissa of the power generation feasible region is the dominant generator group C 1 The ordinate is the total provincial load. The variation interval of the abscissa is [ 43558710 ]]MW, range of variation of ordinate [ 1900027000]MW。
And 5: and determining the initial operation mode of the regional power grid according to the total regional load and the minimum value of the active power of the leading generator group. The method specifically comprises the following steps:
1)C 1 the output of the units in the group is arranged at the maximum of each unit50% of the output, namely 4355 MW;
2) determining C by using 3000MW as critical safety constraint condition of transmission power of critical section 2 The total output of the battery pack, i.e., 6868MW, was 67% of its maximum output of 6868/10250.
3) Determining C according to the power generation and load balance rule of the provincial power grid 3 The total output of the units in the group is 8560 MW.
Step 6: and determining the feasible power generation domain according to the corresponding power generation power of the leading generator group under the critical safety of the key section corresponding to different load quantities.
The method comprises the following specific steps: fixed initial operating mode C 2 The output of the group unit is 6868MW, the area minimum load is 19000MW is taken as the starting point, C 1 The output of the group unit is continuously increased on the basis of the original 50% output (namely the output of the group unit is continuously increased on the basis of the output of the regional power grid in the initial operation mode), and C is adjusted according to the current load level of the whole power grid 3 The output of the group unit is up to the critical safety or critical out-of-limit of the critical section, at the moment C 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load. Continuously increasing the area load, and calculating the C when the critical face boundary under each specific load is safe 1 And (4) generating the electrode limit by the group unit until the load is increased to the maximum load of the area. And (3) taking the non-out-of-limit area of the key section as a safe area and the out-of-limit area as an unsafe area, and drawing a feasible power generation area of the dominant generator group relative to the specific section in the regional power grid, wherein the feasible power generation area is shown in figure 3.
Example 2
Based on the same inventive concept as embodiment 1, an embodiment of the present invention provides a practical analysis apparatus for a power generation feasible region, including:
the screening unit is used for screening out all the units in the area related to the dispatching plan;
the calculating unit is used for calculating the power sensitivity of the active power of each unit relative to a specific section;
the grouping unit is used for grouping all the units in the area by integrating the power sensitivity and the geographical position of each unit, and taking the group with the maximum power sensitivity as a leading generator group;
the first determining unit is used for constructing a frame of an initial power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate;
the second determining unit is used for determining the initial operation mode of the regional power grid according to the regional total load and the minimum value of the active power of the leading generator group;
and the construction unit is used for adjusting the operation mode of the regional power grid by taking the critical safety of a specific section as constraint under different load levels and different power generation output of a leading generator group on the basis of the initial operation mode of the regional power grid, and constructing a power generation feasible region for power generation safety check.
In a specific implementation manner of the embodiment of the present invention, the method for calculating the dominant generator group includes:
calculating the active sensitivity of each cluster relative to a specific section
Wherein the content of the first and second substances,
the power sensitivity of the fleet is indicated,
representing the total active power of the ith cluster;
all clusters are arranged from large to small according to power sensitivity and are sequentially C 1 ～C n Wherein n is the number of groups, C 1 The cluster is the leading generator cluster.
In a specific implementation manner of the embodiment of the present invention, the method for determining the power generation feasible region includes:
c in initial operation mode of fixed area power grid 2 Total output of the group unit, starting from the minimum load of the region, C 1 The group unit continuously increases the output on the basis of the output of the regional power grid in the initial operation mode, and simultaneously adjusts C according to the current load level of the whole grid 3 The total output of the group unit is up to the critical safety or critical out-of-limit of the specific section, and C 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load;
continuously increasing the area load, and calculating the critical safety C of the specific section under each specific load 1 Generating electrode limit of the group unit until the load is increased to the maximum load of the area;
and drawing a feasible power generation area of a leading generator group corresponding to the specific section in the regional power grid by taking the non-overrun area of the specific section as a safe area and the overrun area as an unsafe area.
The rest of the process was the same as in example 1.
Example 3
Based on the same inventive concept as embodiment 1, an embodiment of the present invention provides a practical analysis system for a feasible power generation domain, including: a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any of embodiment 1.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (7)
1. A practical analysis method for a feasible power generation domain is characterized by comprising the following steps:
screening out all the units in the area related to the dispatching plan;
calculating the power sensitivity of the active power of each unit relative to a specific section;
the power sensitivity and the geographical position of each unit are integrated, all the units in the area are grouped, and the group with the maximum power sensitivity is used as a leading generator group;
constructing a frame of an initial power generation feasible region by taking the active power change range of the leading generator group as an abscissa and the total load change range of the region as an ordinate;
determining an initial operation mode of a regional power grid according to the regional total load and the minimum value of the active power of the leading generator group;
based on the initial operation mode of the regional power grid, under different load levels and different power generation output of a leading generator group, the operation mode of the regional power grid is adjusted by taking the critical safety of a specific section as constraint to construct a power generation feasible region for power generation safety check;
the grouping of all the units in the area comprises the following steps:
clustering each unit by adopting a K-means method according to the power sensitivity of each unit;
adjusting the clustering result of the K-means method according to the geographical position of each unit, wherein the adjustment ensures that the units in the same area are divided into the same group to obtain a plurality of final machine groups;
the calculation method of the leading generator group comprises the following steps:
calculating the active sensitivity of each cluster relative to a specific section
Wherein the content of the first and second substances,
a power sensitivity of the fleet is indicated,
representing the total active power of the ith cluster;
all clusters are arranged from large to small according to power sensitivity and are sequentially C 1 ～C n Wherein n is the number of groups, C 1 The group is the leading generator group.
2. The utility analysis method for a feasible region of power generation according to claim 1, wherein: the calculation formula of the power sensitivity is as follows:
wherein the content of the first and second substances,
indicating power sensitivity, P tie The active power of a specific section is shown,
and the active power of the ith generator in the unit is represented.
3. The utility analysis method for a feasible region of power generation according to claim 1, wherein: the number of the clusters is 3; the method for determining the initial operation mode of the regional power grid comprises the following steps:
C 1 the output of each unit in the group is set as a set percentage value of the maximum output of each unit;
determining C by using the critical safety of the transmission power of a specific section as a constraint condition 2 Total output of the units in the group, wherein, if C 2 When all the units of the group are fully loaded, the specific section is not overloaded yet, and C is 2 The total output of the unit in the group is set to 100 percent;
determining C by taking power balance of power generation and load of the whole network as a constraint condition 3 And (4) finishing the determination of the initial operation mode of the regional power grid by the total output of the units in the group.
4. The utility analysis method for power generation feasible region according to claim 3, characterized in that: the method for determining the feasible power generation domain comprises the following steps:
c in initial operation mode of fixed area power grid 2 Total output of the group unit, starting from the minimum load of the region, C 1 The group unit continuously increases the output on the basis of the output in the initial operation mode of the regional power grid, and simultaneously adjusts C according to the current load level of the whole power grid 3 The total output of the group unit is up to the critical safety or critical out-of-limit of the specific section,at this time C 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load;
continuously increasing the area load, and calculating the critical safety C of the specific section under each specific load 1 Generating electrode limit of the group unit until the load is increased to the maximum load of the area;
and drawing a feasible power generation area of a leading generator group corresponding to the specific section in the regional power grid by taking the non-overrun area of the specific section as a safe area and the overrun area as an unsafe area.
5. A power generation feasible region utility analysis apparatus, comprising:
the screening unit is used for screening out all the units in the area related to the dispatching plan;
the calculating unit is used for calculating the power sensitivity of the active power of each unit relative to a specific section;
the grouping unit is used for grouping all the units in the area by integrating the power sensitivity and the geographic position of each unit, and taking the group with the maximum power sensitivity as a leading generator group;
the first determining unit is used for constructing a frame of an initial power generation feasible region by taking the active power change range of the leading generator group as an abscissa and taking the total load change range of the region as an ordinate;
the second determining unit is used for determining the initial operation mode of the regional power grid according to the regional total load and the minimum value of the active power of the leading generator group;
the system comprises a construction unit, a power generation safety check unit and a power generation safety check unit, wherein the construction unit is used for adjusting the operation mode of a regional power grid by taking the critical safety of a specific section as constraint on the basis of the initial operation mode of the regional power grid under different load levels and different power generation output of a leading generator group to construct a power generation feasible region for power generation safety check;
the grouping of all the units in the area comprises the following steps:
clustering each unit by adopting a K-means method according to the power sensitivity of each unit;
adjusting the clustering result of the K-means method according to the geographical position of each unit, wherein the adjustment ensures that the units in the same area are divided into the same group to obtain a plurality of final machine groups;
the calculation method of the leading generator group comprises the following steps:
calculating the active sensitivity of each cluster relative to a specific section
Wherein the content of the first and second substances,
the power sensitivity of the fleet is indicated,
representing the total active power of the ith cluster;
all clusters are arranged from large to small according to power sensitivity and are sequentially C 1 ～C n Wherein n is the number of groups, C 1 The group is the leading generator group.
6. The utility analysis device for power generation feasible region according to claim 5, wherein the method for determining the power generation feasible region comprises:
c in initial operation mode of fixed area power grid 2 Total output of the group unit, starting from the minimum load of the region, C 1 The group unit continuously increases the output on the basis of the output of the regional power grid in the initial operation mode, and simultaneously adjusts C according to the current load level of the whole grid 3 The total output of the group unit is up to the critical safety or critical out-of-limit of the specific section, and C is carried out 1 The output of the inter-group unit is the boundary of the feasible power generation domain under the corresponding load;
continuously increasing the area load, and calculating the critical safety C of the specific section under each specific load 1 Generating electrode limit of the group unit until the load is increased to the maximum load of the area;
and drawing a feasible power generation area of a leading generator group corresponding to the specific section in the regional power grid by taking the non-overrun area of the specific section as a safe area and the overrun area as an unsafe area.
7. A power generation feasible domain utility analysis system, comprising: a storage medium and a processor;
the storage medium is used for storing instructions;
the processor is configured to operate in accordance with the instructions to perform the steps of the method according to any one of claims 1 to 4.
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| CN109904856A (en) * | 2019-03-19 | 2019-06-18 | 国电南瑞科技股份有限公司 | AC-DC hybrid power grid security constraint Unit Combination calculation method and system |
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| CN109904856A (en) * | 2019-03-19 | 2019-06-18 | 国电南瑞科技股份有限公司 | AC-DC hybrid power grid security constraint Unit Combination calculation method and system |
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