CN115395509A - Provincial and regional integrated power grid fault handling method - Google Patents
Provincial and regional integrated power grid fault handling method Download PDFInfo
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- CN115395509A CN115395509A CN202211024005.9A CN202211024005A CN115395509A CN 115395509 A CN115395509 A CN 115395509A CN 202211024005 A CN202211024005 A CN 202211024005A CN 115395509 A CN115395509 A CN 115395509A
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The invention discloses a provincial and regional integrated power grid fault handling method, which is based on a provincial and regional integrated model system. Further, the local dispatching determines an effective mode to adjust the strategy according to the wiring form and the switching state of the relevant power distribution network and sorts the strategy according to a target function, and the local dispatching sends the sorted strategies to the provincial dispatching in sequence for risk assessment to obtain a feasible optimal provincial and local integrated fault disposal strategy. The invention can provide an integrated fault handling auxiliary strategy for provincial and local dispatching, and effectively improves the fault handling capacity and the safe operation level of the power grid.
Description
Technical Field
The invention relates to a provincial and local integrated power grid fault handling method, and belongs to the technical field of power system fault handling.
Background
With the continuous improvement of the demand of the power load of a power grid user, a large number of distributed power sources, electric vehicles and other novel energy sources and the development of direct current engineering, the traditional power grid faces a series of problems of line capacity tension, unbalanced local load, insufficient power supply capacity and the like, in addition, the power grid is easily influenced by factors such as severe weather, artificial misoperation, equipment aging and the like, the occurrence of power grid faults is inevitable, and an effective fault handling method is needed for guaranteeing power supply and reducing loss.
The current provincial and local power grid dispatching systems are independent, so that the information interactivity is not strong, data inconsistency exists, and the fault handling scheme cannot achieve global consideration and is integrally reliable.
How to better handle the provincial and local power grid faults and realize feasibility and rationality of a power grid operation mode is a technical problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a provincial-local integrated power grid fault handling method, which realizes data synchronization and service communication of a provincial-local scheduling system based on provincial-local integration, determines an adjustable range and issues a local scheduling according to the provincial scheduling and then adjusts an operation mode according to the topology and the switch state of a power grid according to the local scheduling aiming at the power grid fault to be handled, so that the fault handling method is obtained, the provincial-local two-stage scheduling results are intercommunicated and verified mutually, and the reliability and the fault handling capability of a result strategy are improved.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a provincial and regional integrated power grid fault handling method comprises the following steps:
step 1: and reading power grid equipment model data, power generation and utilization information, switching states, provincial and regional power grid boundaries and power grid operation data of each voltage level of the provincial and regional power grid of the current time section by the power grid provincial and regional integrated model, and determining the current provincial and regional power grid model.
And 2, step: and determining the fault information to be solved according to the risk prediction or the expected fault set.
And 3, step 3: substituting the fault information to be solved into a provincial and local power grid model for simulation, carrying out load flow calculation to obtain stations and lines where the power-losing equipment and the newly-added heavy load out-of-limit equipment are located, determining the range of the local power grid affected by the fault by combining provincial and local power grid boundary information, and issuing the range of the local power grid adjusted according to the fault operation mode by the provincial and local power grid.
And 4, step 4: according to the adjusted range of the local dispatching power grid, the topological relation between a distribution network switch and a load network is obtained through corresponding local dispatching, switch topological constraints corresponding to each wiring mode are generated, and a load coefficient matrix L of the topological relation between the power point transformer substation and the switch is generated according to the switch topological constraints corresponding to each wiring mode s And load coefficient vector B s 。
And 5: load coefficient matrix L according to topological relation between power point transformer substation and switch s And load coefficient vector B s And determining various constraint conditions required by the local dispatching for fault isolation mode adjustment according to the state of the power grid switch 0-1 before the fault occurs.
And 6: and setting a target function for a mode adjustment strategy of the local dispatching electric network, solving the target function by combining various constraint conditions required by fault isolation mode adjustment of the local dispatching, acquiring and sequencing fault handling strategies, and obtaining the sequenced fault handling strategies.
And 7: selecting a first fault handling strategy in the sorted fault handling strategies, sending back to the provincial dispatching from the local dispatching for carrying out simulation load flow calculation verification to obtain comparison of power-losing equipment and newly-added heavy-load out-of-limit equipment, carrying out risk assessment on the provincial dispatching power grid, feeding back to the local dispatching if the risk exists, sending the next sorted fault handling strategy by the local dispatching, continuing to carry out verification by the provincial dispatching until the risk assessment of the provincial dispatching is in a reasonable range, and outputting the fault handling strategy as a final strategy.
Preferably, the provincial and local power grid integration model comprises: all primary equipment, topology and power flow of the ground level 10kV-110kV and the provincial level 220kV-500kV are stored by the power grid provincial and local integrated platform.
Preferably, the fault information includes: the method comprises the following steps of determining the fault occurrence position, the fault type, the duration, the influence on node lines with different voltage levels and the fault occurrence prediction probability.
Preferably, the method for determining the range of the local area network affected by the fault is as follows:
step 3.1: recording provincial power grid measurement information before the fault, and adjusting the operation mode of the provincial power grid model according to the expected fault information.
Step 3.2: and (4) simulating and recording the power change of the provincial power grid through load flow calculation, and comparing the states before the fault to obtain the branch circuit specifically influenced by the fault.
Step 3.3: and correspondingly obtaining the downstream subordinate local dispatching and the fault range according to the provincial branch affected by the fault, obtaining the range of the local dispatching power grid needing to carry out operation mode adjustment according to the unadjustable key line and load of the provincial dispatching removing part, and issuing the local dispatching.
Preferably, the load flow calculation needs to satisfy the following constraints:
in the formula, P i And Q i Representing the injected active and reactive power of the node i; for each branch, P ji 、Q ji 、I ji For active, reactive power and current values, P, from node j to node i ik 、Q ik Is active and reactive power from node j to node k, r ij 、x ij Represents the resistance and reactance of the branch (i, j); phi (i) and psi (i) are shown separatelyShowing a power inflow inode set and a power outflow inode set which are connected with a node i; n denotes all branches of the entire network, N S Representing all faulty branches in the fault information.
Preferably, the load coefficient matrix L s And load coefficient vector B s The following relationship is satisfied:
in the formula, P G,adj The transmission power of a 220kV or 500kV main transformer of a number adj corresponding to the fault determined by the provincial power grid is represented, S is a switch column vector, S 1 ～S n Switching column vectors, L, for various types of topological cells s,1 ～L s,n Is a linear coefficient row vector of an active balance equation in a topological unit, B s,1 ～B s,n Is a load coefficient vector, and I is a unit row vector.
As a preferred scheme, the constraints required by the local dispatching for fault isolation mode adjustment include:
1) Each power point and on-off state need satisfy the active power balance restraint in the distribution network after the fault isolation mode adjustment is carried out to the ground dispatch, specifically as follows:
P G,adj -(L s,adj S+B s,adj +ΔP G,adj )＝0 adj＝1,2,…N T
in the formula, L s,adj Linear coefficient row vectors of an active power balance equation in each topological unit; delta P G,adj Load control quantity N of the adj main transformer required by representation mode adjustment T Represents the number of main transformers of a power supply point, B s,adj Representing the load coefficient vector of the adj main transformer, P G,adj And the power is transmitted under a 220kV or 500kV main transformer of a number adj corresponding to the fault determined by the provincial power grid, and S is a switch column vector.
2) The ground transfer is for guaranteeing the electric wire netting operation safety, need carry out the operation mode adjustment and prevent that power point and feeder from taking place the overload, promptly:
in the formula, P F,line Representing feeder line transmission power, P G,adj,max And P F,line,max Respectively represents the maximum power allowed by the main transformer adj to be sent down and the maximum power allowed by the feeder line to be transmitted, N F And the number of feeder lines of the distribution network is represented.
Preferably, the objective function includes:
min F＝f 1 +f 2
wherein F is an objective function for adjusting the fault handling mode of the dispatching system, F 1 Cost for the number of switching actions, f 2 The cost is controlled for the load.
Cost f of number of switching operations 1 ：
In which the subscript u denotes the voltage level, K u A switch operation cost coefficient corresponding to the voltage class; w is a switch number, and Ns is a fault influence range switch set; s' w And S w Respectively showing the switch states before and after the mode change.
Load control cost f 2 ：
In the formula, N adj Indicating the power supply main transformer set, C, which is adjusted in a controlled manner and requires the control of the load adj Represents a cost coefficient, deltaP, corresponding to each power supply load control G,adj And indicating the load control quantity required by the adjustment of the mode on the adj main transformer.
Has the advantages that: the invention provides a provincial and regional integrated power grid fault handling method, which is based on a provincial and regional integrated model system, and firstly determines the fault influence and the power grid range capable of being adjusted in a mode by provincial dispatching aiming at the expected fault or the fault to be researched and issues the power grid range to regional dispatching. Further, the local dispatching determines an effective mode to adjust the strategy according to the wiring form and the switching state of the relevant power distribution network and sorts the strategy according to a target function, and the local dispatching sends the sorted strategies to the provincial dispatching in sequence for risk assessment to obtain a feasible optimal provincial and local integrated fault disposal strategy.
The method can provide an integrated fault handling auxiliary strategy for provincial and local dispatching, and effectively improves the fault handling capacity and the safe operation level of the power grid.
Drawings
Fig. 1 is a general flow chart of provincial and local integrated grid fault handling according to the present invention.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1, a provincial and local integrated power grid fault handling method includes the following steps:
step 1: and reading power grid equipment model data, power generation and utilization information, switching states, provincial and local power grid boundaries and power grid operation data of each voltage level of the provincial dispatching and the local dispatching of the current time section by the power grid provincial and local integrated model, and determining the current provincial and local power grid model.
And 2, step: determining fault information to be solved according to risk prediction or an expected fault set, wherein the fault information comprises: the method comprises the steps of determining the position of a fault, the type of the fault, the duration, the influence on node lines with different voltage levels and the fault occurrence prediction probability, so as to ensure the practicability of generating a disposal strategy.
And 3, step 3: substituting the fault information to be solved into a provincial and local power grid model for simulation, carrying out load flow calculation to obtain stations and lines where the power-losing equipment and the newly-added heavy load out-of-limit equipment are located, determining the range of the local power grid affected by the fault by combining provincial and local power grid boundary information, and issuing the range of the local power grid adjusted according to the fault operation mode by the provincial and local power grid.
And 4, step 4: according to the range of the local dispatching power grid to be adjusted determined in the step 3, 110kV, 35kV and 10kV power distribution network switches and load network topology are obtained by corresponding local dispatchingRelation, generating switch topological constraint corresponding to each wiring mode, and generating a load coefficient matrix L of the power point transformer substation and the switch topological relation according to the switch topological constraint corresponding to each wiring mode s And load coefficient vector B s 。
And 5: according to the load coefficient matrix L of the topological relation between the power point transformer substation and the switch in the step 4 s And load coefficient vector B s And determining various constraint conditions required by the local dispatching for fault isolation mode adjustment according to the state of the power grid switch 0-1 before the fault occurs.
And 6: and (5) setting a target function for the mode adjustment strategy of the local dispatching electric network, solving the target function by combining various constraint conditions required by fault isolation mode adjustment of the local dispatching determined in the step (5), acquiring fault handling strategies, and sequencing to obtain the sequenced fault handling strategies. The objective function includes: the number of switching changes is minimized and the amount of load control is minimized.
And 7: and (3) sending the first fault handling strategy in the fault handling strategies sequenced in the step (6) back to the provincial dispatching from the local dispatching for carrying out simulation load flow calculation verification to obtain comparison of the power-losing equipment and risk evaluation of the provincial dispatching power grid by newly-added heavy load out-of-limit equipment, if the risk exists, feeding back to the local dispatching, sending the next strategy sequenced in the step (6) by the local dispatching, continuing to carry out verification by the provincial dispatching until the risk evaluation of the provincial dispatching is in a reasonable range, and outputting the strategy as a final strategy.
The power grid province and region integrated model in the step 1 simultaneously comprises all primary equipment of a region level 10kV-110kV and a region level 220kV-500kV, such as a bus, a main transformer, a switch and the like, topology and tide, and is stored by a power grid province and region integrated platform.
In the provincial and regional classification dispatching of the power grid, the large-scale power loss of the regional power grid can be caused by the fault outage and maintenance of the provincial power grid equipment, and the flow and power balance of the provincial power grid is also influenced by the fault outage and maintenance of the regional power grid. Therefore, the consistency of basic data of the information read by the provincial and local power grid model needs to be ensured by comparing the provincial and local power grid models, so that the reliability of the calculation result is ensured.
The method for determining the range of the local dispatching power grid affected by the fault in the step 3 comprises the following steps:
1) Recording provincial power grid measurement information before the fault, and adjusting the operation mode of the provincial power grid model according to the expected fault information.
2) And (3) simulating and recording the power change of the provincial power grid through load flow calculation, and comparing the states before the fault to obtain a branch circuit with specific influence of the fault, wherein the branch circuit comprises a main transformer and a line. The concrete load flow calculation needs to meet the following requirements:
in the formula, P i And Q i Representing the injected active and reactive power of the node i; for each branch, P ji 、Q ji 、I ji For active, reactive power and current values, P, from node j to node i ik 、Q ik Is the active and reactive power from node j to node k, r ij 、x ij Represents the resistance and reactance of the branch (i, j); phi (i) and psi (i) respectively represent a power inflow inode set and a power outflow inode set connected with the node i; n denotes all branches of the entire network, N S Representing all faulty branches in the fault information.
3) And correspondingly obtaining a downstream subordinate local dispatching and a fault range according to the provincial branch affected by the fault, obtaining the range of the local dispatching power grid which needs to carry out operation mode adjustment according to the unadjustable key line and load of the provincial dispatching removing part, and issuing the local dispatching.
The load coefficient matrix L in step 4 s And load coefficient vector B s The following relationship is required:
in the formula，P G,adj The transmission power of a 220kV or 500kV main transformer with the number adj corresponding to the fault determined by the provincial power grid is represented, S is a switch column vector, and S is 1 ～S n Switching column vectors, L, for various types of topology cells s,1 ～L s,n Is a linear coefficient row vector of an active power balance equation in a topological unit, B s,1 ～B s,n Is the load coefficient vector, and I is the unit row vector.
Because the transformer substation contact modes in the power distribution network have different wiring modes such as direct supply, series supply, T-type series supply and mixed series supply, different vectors and matrixes in the above formula need to be corresponded, and the connection mode is determined according to the specific situation of a fault range.
In step 5, the constraints required for adjusting the fault isolation mode of the local dispatching system include:
1) Each power point and on-off state need satisfy the active power balance restraint in the distribution network after the fault isolation mode adjustment is carried out to the ground dispatch, specifically as follows:
P G,adj -(L s,adj S+B s,adj +ΔP G,adj )＝0 adj＝1,2,…N T (4)
in the formula, L s,adj Linear coefficient row vectors of an active power balance equation in each topological unit; delta P G,adj Load control quantity, N, required for representation mode adjustment under adj main transformers T Represents the number of main transformers of a power supply point, B s,adj Representing the load coefficient vector of the adj main transformer, P G,adj And the transmission power of a 220kV or 500kV main transformer with the number adj corresponding to the fault determined by the provincial power grid is represented, and S is a switch column vector.
2) The ground transfer is for guaranteeing the electric wire netting operation safety, need carry out the operation mode adjustment and prevent that power point and feeder from taking place the overload, promptly:
in the formula, P F,line Representing feeder line transmission power, P G,adj,max And P F,line,max Respectively representing the maximum power allowed by the main transformer adj to be sent down and a feeder lineMaximum power, N, of line allowed transmission F Representing the number of feeder lines of the distribution network.
The specific form of the objective function in step 6 is as follows:
1) Cost of switching times f 1 ：
In which the subscript u denotes the voltage level, K u A switch operation cost coefficient corresponding to the voltage class; w is a switch number, and Ns is a fault influence range switch set; s' w And S w Respectively showing the switch states before and after the mode change.
2) Load control cost f 2 ：
In the formula, N adj Indicating the power supply main transformer set, C, which is adjusted in a controlled manner and requires the control of the load adj Represents the cost coefficient, delta P, corresponding to each power supply load control G,adj And indicating the load control quantity required by the adjustment of the mode on the adj main transformer.
3) Overall objective function:
min F＝f 1 +f 2 (8)
in the equation, F is an objective function for adjusting the method of handling the fault in the local area network, and each of F needs to include a cost F of the number of switching operations 1 And a load control cost f 2 。
After the ground-level power grid solves the fault handling according to the constraint conditions and the objective function conditions, more than one mode of adjusting strategies can be obtained generally. The mode adjustment of the ground-level power grid can also affect the provincial main network, so that after the obtained strategies are sorted according to the target, the provincial dispatching verifies the risk of each strategy on the main network in sequence, and finally the adopted fault handling strategy is determined so as to ensure the reliability and comprehensiveness of the result.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A province and local integrated power grid fault handling method is characterized by comprising the following steps: the method comprises the following steps:
step 1: reading power grid equipment model data, power generation and utilization information, switching states, provincial and regional power grid boundaries and power grid operation data of current time section provincial dispatching and regional dispatching voltage levels by the power grid provincial and regional integrated model, and determining a current provincial and regional power grid model;
and 2, step: determining fault information to be solved according to risk prediction or an expected fault set;
and 3, step 3: substituting fault information to be solved into a provincial and regional power grid model for simulation, carrying out load flow calculation to obtain stations and lines where power-losing equipment and newly-added heavy load out-of-limit equipment are located, determining a region of a local dispatching power grid affected by the fault by combining provincial and regional power grid boundary information, and issuing a region of the local dispatching power grid adjusted according to a fault operation mode by the provincial dispatching power grid;
and 4, step 4: according to the adjusted range of the local dispatching power grid, the topological relation between the power distribution network switch and the load network is obtained through corresponding local dispatching, the switch topological constraint corresponding to each wiring mode is generated, and the load coefficient matrix L of the topological relation between the power point transformer substation and the switch is generated according to the switch topological constraint corresponding to each wiring mode s And load coefficient vector B s ；
And 5: load coefficient matrix L according to topological relation between power point transformer substation and switch s And load coefficient vector B s Determining various constraint conditions required by the local dispatching for fault isolation mode adjustment according to the state of a power grid switch 0-1 before a fault occurs;
and 6: setting a target function for a mode adjustment strategy of a local dispatching electric network, solving the target function by combining various constraint conditions required by fault isolation mode adjustment of the local dispatching, acquiring fault handling strategies, and sequencing to obtain a sequenced fault handling strategy;
and 7: selecting a first fault handling strategy in the sorted fault handling strategies, sending back to the provincial dispatching from the local dispatching for carrying out simulation load flow calculation verification to obtain comparison of power-losing equipment and newly-added heavy-load out-of-limit equipment, carrying out risk assessment on the provincial dispatching power grid, feeding back to the local dispatching if the risk exists, sending the next sorted fault handling strategy by the local dispatching, continuing to carry out verification by the provincial dispatching until the risk assessment of the provincial dispatching is in a reasonable range, and outputting the fault handling strategy as a final strategy.
2. The provincial-local integrated power grid fault handling method according to claim 1, wherein: the provincial and local power grid integrated model comprises: all primary equipment, topology and power flow of the ground level 10kV-110kV and the provincial level 220kV-500kV are stored by the power grid provincial and local integrated platform.
3. The provincial-local integrated power grid fault handling method according to claim 1, wherein: the fault information includes: the fault type, the duration, the influence on the node lines with different voltage levels and the fault occurrence prediction probability.
4. The provincial-local integrated power grid fault handling method according to claim 1, wherein: the method for determining the range of the ground-conditioning power grid affected by the fault comprises the following steps:
step 3.1: recording provincial power grid measurement information before a fault, and adjusting the operation mode of a provincial power grid model according to expected fault information;
step 3.2: simulating and recording the power change of the provincial power grid through load flow calculation, and comparing the states before the fault to obtain a branch circuit specifically influenced by the fault;
step 3.3: and correspondingly obtaining the downstream subordinate local dispatching and the fault range according to the provincial branch affected by the fault, obtaining the range of the local dispatching power grid needing to carry out operation mode adjustment according to the unadjustable key line and load of the provincial dispatching removing part, and issuing the local dispatching.
5. The provincial-local integrated power grid fault handling method according to claim 1 or 4, wherein: the load flow calculation needs to satisfy the following constraints:
in the formula, P i And Q i Representing the injected active and reactive power of the node i; for each branch, P ji 、Q ji 、I ji For active, reactive power and current values, P, from node j to node i ik 、Q ik Is the active and reactive power from node j to node k, r ij 、x ij Represents the resistance and reactance of the branch (i, j); phi (i) and psi (i) respectively represent a power inflow inode set and a power outflow inode set which are connected with the node i; n denotes all branches of the whole network, N S Representing all faulty branches in the fault information.
6. The provincial-local integrated power grid fault handling method according to claim 1, wherein: the load coefficient matrix L s And load coefficient vector B s The following relationship is satisfied:
in the formula, P G,adj The transmission power of a 220kV or 500kV main transformer of a number adj corresponding to the fault determined by the provincial power grid is represented, S is a switch column vector, S 1 ～S n Switching column vectors, L, for various types of topology cells s,1 ～L s,n For an active power balance party in a topological unitLinear coefficient row vector of the equation, B s,1 ～B s,n Is the load coefficient vector, and I is the unit row vector.
7. The provincial-local integrated power grid fault handling method according to claim 1, wherein: the constraint conditions required by the local dispatching for fault isolation mode adjustment comprise:
each power point and on-off state need satisfy the active power balance restraint in the distribution network after the fault isolation mode adjustment is carried out to the ground dispatch, specifically as follows:
P G,adj -(L s,adj S+B s,adj +ΔP G,adj )＝0adj＝1,2,…N T
in the formula, L s,adj Linear coefficient row vectors of an active power balance equation in each topological unit; delta P G,adj Load control quantity, N, required for representation mode adjustment under adj main transformers T Represents the number of main transformers of the power supply point, B s,adj Representing the load coefficient vector of the adj main transformer, P G,adj The power transmission under the 220kV or 500kV main transformer of the number adj corresponding to the fault determined by the provincial power grid is represented, and S is a switch column vector;
the ground transfer is for guaranteeing the electric wire netting operation safety, needs to carry out the operation mode adjustment and prevents that power point and feeder from taking place to transship, promptly:
in the formula, P F,line Representing feeder line transmission power, P G,adj,max And P F,line,max Respectively represents the maximum power allowed by the main transformer adj to be sent down and the maximum power allowed by the feeder line to be transmitted, N F Representing the number of feeder lines of the distribution network.
8. The provincial-local integrated power grid fault handling method according to claim 1, wherein:
the objective function includes:
minF＝f 1 +f 2
wherein F is an objective function for adjusting the mode of handling the fault of the local dispatching, F 1 Cost for the number of switching actions, f 2 Controlling costs for the load;
cost of switching times f 1 ：
In which the subscript u denotes the voltage level, K u A switch operation cost coefficient corresponding to the voltage class; w is a switch number, and Ns is a fault influence range switch set; s' w And S w Respectively representing the switch states before and after the mode change;
load control cost f 2 ：
In the formula, N adj The main transformer set of the power supply, C, showing the need of controlling the load through the mode adjustment adj Represents the cost coefficient, delta P, corresponding to each power supply load control G,adj And indicating the load control quantity required by the adjustment of the mode on the adj main transformer.
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| CN116579549A (en) * | 2023-04-27 | 2023-08-11 | 国网安徽省电力有限公司歙县供电公司 | Optimized scheduling method and system for source network load storage |
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| CN116579549B (en) * | 2023-04-27 | 2023-12-01 | 国网安徽省电力有限公司歙县供电公司 | Optimized scheduling method and system for source network load storage |
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