CN112583006B - Power distribution network load access decision and promotion method - Google Patents

Power distribution network load access decision and promotion method Download PDF

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CN112583006B
CN112583006B CN202011411065.7A CN202011411065A CN112583006B CN 112583006 B CN112583006 B CN 112583006B CN 202011411065 A CN202011411065 A CN 202011411065A CN 112583006 B CN112583006 B CN 112583006B
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distribution network
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肖媛
黄谦文
廖雪松
刘波
严小玉
邵晨辉
陈巍
邓千弘
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Ganzhou Power Supply Branch State Grid Jiangxi Electric Power Co ltd
State Grid Corp of China SGCC
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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
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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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems
    • Y04S20/222—Demand response systems, e.g. load shedding, peak shaving

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Abstract

The invention discloses a method for decision-making and lifting of load access of a power distribution network, which is characterized in that a main transformer N-1 verification method is researched according to the diversity of in-station transfer and out-station transfer of a main transformer station, and a maximum power supply capacity evaluation model is established. Based on a maximum power supply capacity calculation model, considering the space-time characteristics of actual load distribution, and establishing an accurate calculation model of the maximum openable capacity of the overall power distribution network and the maximum openable capacity of the local feeder line as a research target; considering the contradiction of distribution of power supply capacity among local feeders, designing an auxiliary decision of load access based on the load level among the feeders and the maximum power supply capacity of the whole power distribution network and aiming at minimizing the influence of new load access on the whole openable capacity of the power distribution network, researching the optimal position of the load access, and providing corresponding lifting measures from the perspective of power distribution network frame structure optimization when the openable capacity level of each feeder is low.

Description

Power distribution network load access decision and promotion method
Technical Field
The invention relates to the field of distribution automation, in particular to a method for power distribution network load access decision and promotion.
Background
The power distribution system is an urban infrastructure and has a significant impact on power supply safety. The method is an important link for ensuring reliable power supply as a link for connecting users and a power generation and transmission system. On the basis of the determination of the grid structure of the power distribution network, the main transformer and the feeder line capacity, the load distribution is a main factor influencing the power supply capacity. When the load distribution is extremely unbalanced, the power supply capacity of the power distribution network is greatly weakened, and even part of the feeder lines cannot meet the N-1 safety check. Therefore, how to plan when the newly added load is connected into the distribution network is very important, and the influence of unbalanced load distribution on the power supply capacity is reduced to the maximum extent. When the openable capacity of the feeder line cannot meet the requirement of a newly added load, the power supply capacity can be improved through appropriate measures, and common construction and transformation measures of the existing power distribution network comprise load redistribution, feeder line planning and substation planning, so that appropriate transformation measures need to be adopted according to specific bottleneck conditions, and the expected target is achieved at the minimum cost.
The prior art has the following defects or problems:
1. in the process of calculating and evaluating the power supply capacity of the power distribution network, partial problems exist, the calculation of the open capacity and the load requirement of a line by related departments is not standard, the calculation result is inaccurate, the influence is influenced by a rough management mode on the basis, the deviation between the actual capacity and the planned capacity of a user is often large, so that resources are seriously wasted, and the abnormal phenomenon that a newly reported user cannot access the power distribution network exists.
2. The current load access decision mainly depends on manual experience, lacks rigorous scientific calculation basis and cannot provide humanized service for users. On the other hand, distribution network application calculation of companies is mostly carried out by independently establishing distribution network models according to respective professional requirements for corresponding analysis calculation, application systems are mostly independent of one another and lack uniform information models, data of the application systems are overlapped and redundant, formats of the application systems are not uniform, and repeated maintenance of information models of different application systems is caused.
Disclosure of Invention
The invention aims to provide a method for power distribution network load access decision and improvement aiming at the defects of the prior art so as to achieve the purposes of fully mining the power supply capacity of a power distribution network, improving the active service level of the open capacity of a line and better meeting the power consumption requirements of customers.
In order to achieve the purpose, the invention provides the following technical scheme: a method for power distribution network load access decision and lifting researches a main transformer N-1 calibration method according to diversity of main transformer in-station transfer supply and off-station transfer supply, and establishes a maximum power supply capability evaluation model; based on a maximum power supply capacity calculation model, combining with the space-time characteristics of actual load distribution, establishing an accurate calculation model of the maximum openable capacity of the overall power distribution network and the maximum openable capacity of the local feeder line as a research target; determining the optimal position of load access through an auxiliary decision of load access by taking the minimum influence on the overall openable capacity of the power distribution network after new load access as a target according to the contradiction of distribution of power supply capacity among local feeder lines and based on the load level among the feeder lines and the overall maximum power supply capacity of the power distribution network; and when the level of the open capacity of each feeder line is low, corresponding lifting measures are provided from the perspective of power distribution network frame structure optimization.
Preferably, the maximum power supply capacity calculation model is as follows:
Figure BDA0002817214400000021
wherein,
Figure BDA0002817214400000022
for the maximum load capacity of each segment of the feeder.
Preferably, the calculation model of the open capacity of the power distribution network is as follows:
Figure BDA0002817214400000031
wherein, FAOCCapacity can be opened for the power distribution network; f0The total load of the switched-in distribution network.
Preferably, the calculation model of the openable capacity comprises the power supply capacity of the load connected to the power grid.
Preferably, the calculation model of the maximum open capacity of a certain feeder line to the target open capacity is as follows:
MaxFmk＝Fm-Fm0 (3)
wherein, FmkIs the open capacity of the feeder m; fmIs the maximum load capacity of the feeder m; fm0The active subscriber responds to the actual load on the front feeder m.
Preferably, the maximum openable capacity of the whole power distribution network and the maximum openable capacity of the local feeder line are taken as research targets, the influence of the space-time characteristic of actual load distribution on the openable capacity is considered, and a feeder line openable capacity accurate calculation model is established and solved.
Preferably, when the level of the open capacity of each feeder line is low, corresponding lifting measures are provided from the perspective of grid structure optimization of the power distribution network.
Compared with the prior art, the invention provides a method for power distribution network load access decision and promotion, which has the following beneficial effects:
1. in practice, infinite solutions exist in the TSC model, the condition of unbalanced distribution of the load capacity of the feeder line is easy to occur, and meanwhile, the TSC is used for evaluating the power supply capacity of the whole power distribution network, and the power supply capacity of a single feeder line is often more concerned in actual operation. Therefore, the calculation result of the TSC cannot be directly used for guiding the business expansion work, and the feeder line open capacity model provided by the invention is greatly improved. (ii) a
2. The invention provides a power distribution network load access decision method from a system level, and can effectively solve the problem that the current load access decision mainly depends on manual experience and lacks rigorous scientific calculation basis; and a uniform distribution network model is provided for each distribution network application calculation of a company to perform corresponding analysis calculation, so that repeated maintenance of an application system information model is reduced.
Drawings
FIG. 1 is a decision flow diagram of the present invention;
FIG. 2 is a diagram of the boosting scheme and priority of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in the present embodiment: a load access decision and improvement method for a power distribution network is based on research of TSC and open capacity, and an auxiliary decision flow for load access is designed with the aim of minimizing the influence on the whole open capacity of the power distribution network after new load access. The method comprises the following specific steps:
step one, inputting power distribution network data, a load F to be accessed and reported by a user and all optional access feeders determined according to the area where the load is located, and calculating the TSC. The maximum power supply capacity calculation model is as follows:
Figure BDA0002817214400000041
constraint conditions are as follows:
Figure BDA0002817214400000042
Figure BDA0002817214400000043
Figure BDA0002817214400000051
Figure BDA0002817214400000052
in the formula:
Figure BDA0002817214400000053
maximum load capacity for the jth segment of feeder i; fmIs the maximum load capacity of the feeder m; b is the number of sections of the feeder m; piThe maximum load capacity of a main transformer i is obtained; t isiA main transformer i; RF (radio frequency)mIs the capacity of the feeder m; PRiThe capacity of the main transformer i.
In the formula (2), the maximum load capacity of the feeder m consists of two parts, including the load capacity of the feeder and the load capacity for standby for other feeders, namely, the maximum load of the feeder m comprises the load of the feeder m and the load transferred to the feeder m when the feeder N has an N-1 fault.
In the formula (3), the maximum load capacity of the main transformer i includes the sum of the maximum load capacities of all the feeders belonging to the main transformer i and the load capacity for other main transformers to be used by the bus coupler switch.
Equation (4) is the feeder capacity constraint;
and the formula (5) is the constraint of the main transformer capacity.
Step two, comparing the size of the F and the size of the TSC, and if the F is larger than the TSC, indicating that the load cannot be accommodated on the basis of the current grid structure, the main transformer and the feeder line capacity, wherein the situation generally does not occur in practice; otherwise, turning to the step (3);
step three, calculating the openable capacity F of the power distribution networkAOCAnd corresponding open capacity F of each feederki. The specific model of the open capacity of the power distribution network is as follows:
Figure BDA0002817214400000054
constraint conditions are as follows:
Figure BDA0002817214400000055
Figure BDA0002817214400000061
Figure BDA0002817214400000062
Figure BDA0002817214400000063
Figure BDA0002817214400000064
Figure BDA0002817214400000065
in the formula, FAOCCapacity can be opened for the power distribution network; f0The total load of the accessed power distribution network;
Figure BDA0002817214400000066
the actual load carried by each feeder section of the jth feeder i; the rest of the symbols mean the TSC model.
The formula (6) shows that the openable capacity of the power distribution network is the maximum power supply capacity and actual load is reduced;
equation (12) indicates that the maximum load of each feeder section must be greater than the actual load of each feeder section when calculating the maximum load of each feeder section. The nature of the constraint is equivalent to that the feasible solution range of the TSC model is reduced by considering the influence of the actual load, if the actual load distribution is extremely unreasonable, the power supply capacity is greatly influenced, even the situation of no solution occurs, namely the actual load does not meet the N-1 safety check.
The specific model of the open capacity of the feeder line is as follows:
maxFmk＝Fm-Fm0 (13)
constraint conditions are as follows:
Figure BDA0002817214400000067
Figure BDA0002817214400000068
Figure BDA0002817214400000069
Figure BDA0002817214400000071
Figure BDA0002817214400000072
Figure BDA0002817214400000073
in the formula, FmkIs the open capacity of the feeder m; fmIs the maximum load capacity of the feeder m; fm0Responding to the actual load of the front feeder m for the incentive type user;
Figure BDA0002817214400000074
the maximum load capacity on the ith section of the feeder line m;
Figure BDA0002817214400000075
the actual load on the ith section of the feeder line m; and the other symbol meanings are the same as the calculation model of the open capacity of the power distribution network.
Comparing F with FAOCOf (c) is used. If F > FAOCIllustrating the supply of the current distribution network due to the influence of the load distribution of the currently accessed distribution networkThe electric energy can not accommodate the load, and corresponding lifting measures need to be taken; otherwise, step (4) is carried out;
step four, respectively comparing F with the openable capacity F of each optional access feederkiIf, if
Figure BDA0002817214400000076
The load can be absorbed by the feeder line and the total openable capacity of the power distribution network cannot be reduced after the load is added, so that the load distribution is reasonable, the corresponding feeder line is output as a recommended feeder line, and the process is ended; if not, turning to the step (5);
step five, respectively calculating the maximum open-able capacity F of all the optional access feedersmkiAnd compared with F if
Figure BDA0002817214400000077
The feeder line can absorb the load, but the openable capacity of the overall power distribution network can be reduced after the load is accessed, so that the reduction amount after the load is accessed is calculated respectively, and the feeder line with the minimum reduction amount is taken as a recommended feeder line; otherwise, a lifting measure is required.
Referring to fig. 2, different types of lift-up measures can be taken for different bottleneck situations in conjunction with the order of the lift-up measures.
(1) F is less than or equal to F when no feeder i exists in the optional access feedersmki
Although the total openable capacity of the distribution network can meet the requirement of load access, the local feeder has no way to bear the load, and the proposed hoisting measures include:
a1 adjusts the switch state: setting a new contact point to transfer part of the load of the feeder line with heavier load to the feeder line which is connected with the new contact point and has lower load rate by adjusting the state of the corresponding switch, so that the target feeder line has a part of capacity to meet the requirement of new load access;
a2 adjusting switch position: according to the connection condition of related feeder lines, part of section switches are reasonably added, so that the load transfer of the target feeder line is more dispersed, and the openable capacity of the target feeder line is improved;
a3 load modification: if the feeder which is not connected with the target feeder exists on the periphery of the target feeder, the distance between the feeder and the partial power supply area is close, and the load rate of the feeder is not high, the partial load of the target feeder can be considered to be changed to the feeder;
b1 replacement of lead: capacity expansion is carried out on the target feeder line by combining the capacity of the main transformer so as to meet the requirement of load increase;
b2 new contact: the method has the advantages that the contact can be established between the feeder line with higher load rate and the feeder line with lower load rate in the power distribution network, the state of the switch can be properly adjusted while the contact is established, reasonable contact points are set to improve load distribution, and the power supply capacity is further improved;
b3 newly-built feeder: if none of the above measures can meet the requirements and the conditions of the substation allow new feeder lines to be made, it can be considered that the load increase requirement is met by newly building a feeder line.
(2)F＞FAOCOr F > TSC
If the load rate of the main transformer is high and the load rate of the main transformer is low, the capacity of the main transformer is insufficient, so that the increase of the power supply capacity of power distribution is limited, at the moment, the planning of the transformer substation adopting C-type measures can be adopted, including newly-increased main transformers and main transformer capacity expansion, and even newly-built transformer substations are needed when necessary. If the capacities of the main transformers are remained to a certain extent and the load rates of the corresponding feeders are higher, the capacities of the feeders limit the power supply capacity, so that feeder planning of B-type measures can be adopted, and the power supply capacity of the main transformers is further utilized through measures of feeder capacity expansion, new contact and new feeder construction. If the load ratios of the main transformer and the feeder are both at a high level, B, C types of lifting measures can be combined.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (4)

1. A method for power distribution network load access decision and promotion is characterized in that: researching a main transformer N-1 verification method according to the diversity of the internal transfer supply and the external transfer supply of a main transformer station, and establishing a maximum power supply capability evaluation model; based on a maximum power supply capacity calculation model, combining with the space-time characteristics of actual load distribution, establishing an accurate calculation model of the maximum openable capacity of the overall power distribution network and the maximum openable capacity of the local feeder line as a research target;
determining the optimal position of load access through an auxiliary decision of load access by taking the minimum influence on the overall openable capacity of the power distribution network after new load access as a target according to the contradiction of distribution of power supply capacity among local feeder lines and based on the load level among the feeder lines and the overall maximum power supply capacity of the power distribution network; when the level of the openable capacity of each feeder line is low, corresponding lifting measures are provided from the perspective of power distribution network frame structure optimization;
the maximum power supply capacity calculation model is as follows:
Figure FDA0003603272290000011
wherein,
Figure FDA0003603272290000012
maximum load capacity for each section of the feeder;
the calculation model of the openable capacity of the power distribution network is as follows:
Figure FDA0003603272290000013
wherein, FAOCCapacity can be opened for the power distribution network; f0The total load of the accessed power distribution network;
the method comprises the following steps of (1) calculating a model of the maximum openable capacity of a certain feeder line as the openable capacity of a target feeder line:
MaxFmk＝Fm-Fm0 (3)
wherein, FmkIs the open capacity of the feeder m; fmIs the maximum load capacity of the feeder m; fm0The active subscriber responds to the actual load on the front feeder m.
2. The method for power distribution network load access decision and improvement according to claim 1, wherein: the calculation model of the open capacity comprises the power supply capacity of the accessed load in the power grid.
3. The method for power distribution network load access decision and improvement according to claim 1, wherein: the maximum openable capacity of the whole power distribution network and the maximum openable capacity of the local feeder line are taken as research targets, the influence of the space-time characteristics of actual load distribution on the openable capacity is considered, and a feeder line openable capacity accurate calculation model is established and solved.
4. The method for power distribution network load access decision and improvement according to claim 1, characterized in that: and when the level of the open capacity of each feeder line is low, corresponding lifting measures are provided from the perspective of power distribution network frame structure optimization.
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CN111564845A (en) * 2020-04-28 2020-08-21 国网福建省电力有限公司 Power distribution network power supply capacity evaluation method considering load characteristics and feeder line segmentation

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CN102622711A (en) * 2012-03-31 2012-08-01 天津大学 Power distribution network planning method based on maximum power supply capacity
CN106410785A (en) * 2016-08-08 2017-02-15 国家电网公司 Anticipated fault-based open capacity pre-warning method of power distribution network
CN108649569A (en) * 2018-06-01 2018-10-12 国网江苏省电力有限公司 Power distribution network based on the optimization of multi-joint network feeder switch can open capacity calculation methods
CN111564845A (en) * 2020-04-28 2020-08-21 国网福建省电力有限公司 Power distribution network power supply capacity evaluation method considering load characteristics and feeder line segmentation

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