CN111049185B - Island division method for power distribution network comprising distributed power supply - Google Patents
Island division method for power distribution network comprising distributed power supply Download PDFInfo
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- 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 belongs to the technical field of power grid operation safety, and particularly relates to a power distribution network island division method comprising a distributed power supply. The method comprises the steps of collecting parameters of the power distribution network; formulating load weight; calculating line weights according to the line impedances; describing a radial running structure of the power distribution network by adopting a tree structure, converting the power distribution network into a weighted directed tree, and obtaining an incidence matrix of a connection relation of the power distribution network; checking active power supply and demand constraints before solving the load transmission loss of the whole network; establishing an optimal load reduction strategy; traversing all the distributed power supplies and loads, and calculating the power transmission cost of the distributed power supply-load pair; establishing an island division function by taking the minimization of power transmission cost as a target; comparing islands containing distributed power supplies; and (4) formulating an optimal load flow calculation function. The invention improves the applicability of actual operation, realizes the optimized adjustment of the island scheme and maximizes the utilization rate of the distributed power supply.
Description
Technical Field
The invention belongs to the technical field of power grid operation safety, and particularly relates to a power distribution network island division method comprising a distributed power supply.
Background
Meeting the increasing load demand, optimizing energy structures, and improving energy comprehensive utilization capacity by widely accessing distributed power supplies have received more and more attention. When the regional power supply is insufficient due to the shortage of the electric energy of the upper-level power grid, the equipment of the power distribution system is failed due to severe weather conditions, and the upper-level power grid is broken down, the power distribution region and the upper-level power grid can recover power supply to the load in the island region through reasonable island division, the power supply reliability is improved, and sufficient time is reserved for troubleshooting. The island optimization division of the power distribution network area operating in the island mode is researched, the utilization rate of the distributed power supply is improved, and it is necessary to ensure that the power supply is recovered for loads as much as possible.
The existing island division method usually adopts methods such as branch and bound and depth search, needs to formulate multiple auxiliary rules, causes large computation, cannot meet the real-time operation requirement, limits the use scene, does not consider the controllability of the load, does not carry out secondary verification and optimization, meets the basic voltage constraint and power constraint, cannot ensure the optimal division method, and does not maximally utilize the distributed power supply.
Disclosure of Invention
The invention provides an islanding method for a power distribution network comprising a distributed power supply, aiming at solving the problems in the prior art, and aiming at providing an islanding algorithm with reasonable calculation complexity, improving the applicability of actual operation, comprehensively considering the controllability of load, realizing the optimization and adjustment of an islanding scheme and maximizing the utilization rate of the distributed power supply.
Based on the above purpose, the invention is realized by the following technical scheme:
a power distribution network island dividing method comprising distributed power supplies comprises the following steps:
step 1: collecting parameters of a power distribution network;
and 2, step: setting a load weight according to the size and priority importance of the collected load; calculating line weights according to the line impedances;
and step 3: describing a radial running structure of the power distribution network by adopting a tree structure, converting the power distribution network into a weighted directed tree, and obtaining an incidence matrix of a connection relation of the power distribution network;
and 4, step 4: checking active power supply and demand constraints before solving the load transmission loss of the whole network; if the distributed power supply meets the load requirement, entering step 6; otherwise, entering step 5 until the constraint meets the load requirement;
and 5: establishing an optimal load reduction strategy;
step 6: traversing all the distributed power supplies and loads, and calculating the power transmission cost of the distributed power supply-load pair;
and 7: establishing an island division function by taking the minimization of power transmission cost as a target;
and step 8: comparing the islands containing the distributed power supplies, and merging the islands when the two islands contain a common load;
and step 9: and (5) formulating an optimal load flow calculation function.
The power grid parameters comprise a power distribution network structure, loads and distributed power sources.
Formulating load weight according to the size and priority importance of the collected load; calculating line weights from line impedances, comprising:
load node weight L wi Expressed as:
WL i ＝λ 1 L Gi +λ 2 L Ni +λ 3 L Ci
(1)
in the above formula: i represents a load node; WL i Is the weight of node i; l is Gi Is the load rating of point i, representing a load of 1-3 levels by 1,0.1, and 0.01, respectively; l is a radical of an alcohol Ni Is the normalized capacity of node i; l is a radical of an alcohol Ci Denotes the controllability of the load i, L Ci =1 indicates that the load is controllable; lambda 1 -λ 5 Weight coefficients, 0.4, 0.25 and 0.15, respectively;
in the above formula: WB (wideband weight division multiple Access) ij Represents the weight, z, of line ij ij Representing the impedance of the line.
The method for describing the radial running structure of the power distribution network by adopting the tree structure is WB ij And as the edge weight, converting the power distribution network into a weighted directed tree to obtain an incidence matrix of the connection relation of the power distribution network.
Checking active power supply and demand constraints before solving the load transmission loss of the whole network; if the distributed power supply meets the load requirement, entering step 6; otherwise, step 5 is entered until the constraint meets the load requirement, which includes:
in the above formula: p is a radical of j Representing the active output of the distributed power supply j; d is a radical of i Representing the active demand of a load i; n and m represent the number of loads and distributed power sources, respectively.
The establishing of the optimal load reduction strategy comprises the following steps: determining the load to be cut off and maximizing the load weight as an objective function, considering supply and demand balance constraint, and establishing an optimal load reduction strategy:
in the above formula: x is a binary vector that reflects whether the load is shed by 0 and 1, H represents the backpack volume, p j Representing the active output of the distributed power supply j, d i Represents the load i active demand, WL i Representing the weight of the load, X i Representing a binary vector, by 0 and 1, whether the reaction load is cut off, f x Representing the load shedding objective function.
Establishing an island division function by taking the minimization of the power transmission cost as a target, wherein the obtained result is a plurality of distributed power supply-load pairs after the solution is completed, and the distributed power supply, the corresponding load and a line between the distributed power supply and the corresponding load form a single island; traversing all distributed power supplies to finish primary island division:
in the above formula: x is the number of ij For transferring power from source j to load i, c ij For transmission power cost, p j Representing the active output of the distributed power supply j, d i The number of the distributed power supplies is m.
The optimal load flow calculation function is formulated, and the method comprises the steps of adjusting part of controllable loads, secondarily optimizing and adjusting an island scheme, and outputting a final island division result;
in the above formula: f. of ad Representing a controllable load adjustment objective function, p j Representing the active output, d, of distributed power supply j i Indicating the load i active demand, d c Denotes the uncontrollable load, u c Representing uncontrollable load, dq i Representing the reactive demand of a load i, and alpha and beta are distributed power supply cost coefficients; c represents a load controllable part; u indicates whether the part load is controllable; v represents the bus voltage; y represents the line impedance; b represents a bus set; d represents a load set; g represents a distributed power supply set, theta represents a bus voltage phase angle, UCL represents an uncontrollable load set, CL represents a controllable load set, and k and e represent buses;
representing the maximum output of the distributed power supply; v min And V max Representing the bus voltage limit.
The invention has the following advantages and beneficial effects:
the invention calculates the distributed power supply-load pair through the single-source shortest path algorithm, completes the island division on the basis, and the algorithm has reasonable calculation complexity and improves the applicability of actual operation.
The invention considers the secondary check sum optimization, adjusts the controllable load on the basis of meeting the voltage and power constraints, can realize the optimal adjustment of an island scheme and maximizes the utilization rate of the distributed power supply.
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The invention will be described in further detail with reference to the drawings and specific embodiments for facilitating understanding and practicing of the invention by those of ordinary skill in the art, but it should be understood that the scope of the invention is not limited by the specific embodiments.
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. Other embodiments, which can be obtained by persons skilled in the art without any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in FIG. 1, FIG. 1 is a schematic flow chart of the method of the present invention. The invention relates to a power distribution network island division method comprising a distributed power supply, which comprises the following steps:
step 1: collecting power distribution network parameters, wherein the power distribution network parameters comprise a power distribution network structure, loads and distributed power supplies;
step 2: setting load weight according to the size and priority importance of the collected load, and calculating line weight according to line impedance;
load node weight L wi Expressed as:
WL i ＝λ 1 L Gi +λ 2 L Ni +λ 3 L Ci
(1)
in the above formula: i represents a load node; WL i Is the weight of node i; l is Gi Is the load rating of point i, representing 1-3 levels of load with 1,0.1, and 0.01, respectively; l is a radical of an alcohol Ni Is the normalized capacity of node i; l is a radical of an alcohol Ci Denotes the controllability of the load i, L Ci =1 indicates that the load is controllable; lambda 1 -λ 5 The weight coefficients are 0.4, 0.25 and 0.15, respectively.
In the above formula: WB (wideband weight division multiple Access) ij Weight, z, representing line ij ij Representing the impedance of the line;
and step 3: the radial running structure of the power distribution network is described by adopting a tree structure, and WB (wideband weight division) is used for ij As the edge weight, converting the power distribution network into a weighted directed tree to obtain an incidence matrix of the connection relation of the power distribution network;
and 4, step 4: before solving the whole network load transmission loss, the distributed power supply is required to meet the load requirement, so that the active supply and demand constraint is checked; if the distributed power supply meets the load requirement, entering step 6; otherwise, entering step 5 until the constraint meets the load requirement;
in the above formula: p is a radical of j Representing the active output of the distributed power supply j; d i Representing the active demand of a load i; n and m represent the number of loads and distributed power sources, respectively.
And 5: establishing an optimal load reduction strategy, determining the load to be cut off and taking the load weight maximization as a target function, considering supply and demand balance constraint, and establishing the optimal load reduction strategy;
in the above formula: x is a binary vector, with 0 and 1 indicating whether the load is shed, H indicates backpack volume, p j Representing the active output, d, of distributed power supply j i Representing the load i active demand, WL i Representing the weight of the load, X i Representing a binary vector, by whether the reaction load is cut off by 0 and 1, f x Representing the load shedding objective function.
Step 6: traversing all distributed power supplies and loads, and calculating the power transmission cost of a distributed power supply-load pair by adopting a single-source shortest path algorithm;
and 7: establishing an island division function by taking the minimization of power transmission cost as a target; after the solution is completed, obtaining a plurality of distributed power supply-load pairs, and forming a single island by the distributed power supply and the corresponding load and the circuit between the distributed power supply and the corresponding load; and traversing all distributed power supplies to finish primary island division.
In the above formula: x is a radical of a fluorine atom ij For transferring power from source j to load i, c ij For transmission power cost, p j Representing the active output of the distributed power supply j, d i The number of the distributed power supplies is m.
And step 8: comparing every two isolated islands containing distributed power supplies, and merging the isolated islands when the two isolated islands contain a common load;
and step 9: and (4) formulating an optimal load flow calculation function, adjusting part of controllable loads, secondarily optimizing and adjusting an island scheme, and outputting a final island division result.
In the above formula: f. of ad Representing a controllable load adjustment objective function, p j Representing the active output, d, of distributed power supply j i Indicating the load i active demand, d c Denotes the uncontrollable load, u c Representing uncontrolled load, dq i Representing the reactive demand of a load i, and alpha and beta are distributed power supply cost coefficients; c represents a load controllable part; u indicates whether the part load is controllable; v represents the bus voltage; y represents the line impedance; b represents a bus set; d represents a load set; g represents a distributed power supply set, theta represents a bus voltage phase angle, UCL represents an uncontrollable load set, CL represents a controllable load set, and k and e represent buses;
representing the maximum output of the distributed power supply; v min And V max Representing the bus voltage limit.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A power distribution network island division method comprising a distributed power supply is characterized by comprising the following steps: the method comprises the following steps: step 1: collecting parameters of a power distribution network; step 2: formulating load weight according to the size and priority importance of the collected load; calculating line weights according to the line impedances; and 3, step 3: describing a radial running structure of the power distribution network by adopting a tree structure, converting the power distribution network into a weighted directed tree, and obtaining an incidence matrix of a connection relation of the power distribution network; and 4, step 4: checking active power supply and demand constraints before solving the load transmission loss of the whole network; if the distributed power supply meets the load requirement, entering step 6; otherwise, entering step 5 until the constraint meets the load requirement; and 5: establishing an optimal load reduction strategy, which comprises determining the load to be cut off and taking the load weight maximization as a target function, and establishing the optimal load reduction strategy by considering supply and demand balance constraint; step 6: traversing all distributed power supplies and loads, and calculating the power transmission cost of a distributed power supply-load pair; and 7: establishing an island division function by taking the minimization of power transmission cost as a target; after the solution is completed, obtaining a plurality of distributed power supply-load pairs, and forming a single isolated island by the distributed power supply and the corresponding load and the circuit between the distributed power supply and the corresponding load; traversing all distributed power supplies to finish primary island division: and 8: comparing the islands containing the distributed power supplies, and merging the islands when the two islands contain a common load; and step 9: and (4) formulating an optimal load flow calculation function.
2. The islanding method for the power distribution network comprising the distributed power supply according to claim 1, wherein the islanding method comprises the following steps: the power grid parameters comprise a power distribution network structure, loads and distributed power sources.
3. The islanding method for the power distribution network comprising the distributed power supply according to claim 1, wherein the islanding method comprises the following steps: formulating load weight according to the size and priority importance of the collected load; calculating line weights from the line impedances, including:
load node weight L wi Expressed as:
WL i ＝λ 1 L Gi +λ 2 L Ni +λ 3 L Ci (1)
in the above formula: i represents a load node; WL i Is the weight of node i; l is Gi Is the load rating of point i, representing a load of 1-3 levels by 1,0.1, and 0.01, respectively; l is Ni Is the normalized capacity of node i; l is a radical of an alcohol Ci Denotes the controllability of the load i, L Ci =1 indicates that the load is controllable; lambda [ alpha ] 1 -λ 3 Weight coefficients, 0.4, 0.25 and 0.15, respectively;
in the above formula: WB (wideband weight division multiple Access) ij Represents the weight, z, of line ij ij Representing the impedance of the line.
4. An inclusion distribution according to claim 3A power distribution network island dividing method of a power supply is characterized in that: the method for describing the radial running structure of the power distribution network by adopting the tree structure is WB ij And as the edge weight, converting the power distribution network into a weighted directed tree to obtain an incidence matrix of the connection relation of the power distribution network.
5. The islanding method for the power distribution network comprising the distributed power supply, according to claim 1, is characterized in that: checking active power supply and demand constraints before solving the load transmission loss of the whole network; if the distributed power supply meets the load requirement, entering step 6; otherwise, step 5 is entered until the constraint meets the load requirement, which includes:
in the above formula: p is a radical of j Representing the active output of the distributed power supply j; d i Representing the active demand of a load i; n and m represent the number of loads and distributed power sources, respectively.
6. The islanding method for the power distribution network comprising the distributed power supply according to claim 1, wherein the islanding method comprises the following steps: the establishing of the optimal load reduction strategy comprises the following steps: determining the load to be cut off and maximizing the load weight as an objective function, considering supply and demand balance constraint, and establishing an optimal load reduction strategy, wherein the optimal load reduction strategy comprises the following steps:
in the above formula: x is a binary vector, which reflects whether the load is cut off by 0 and 1, H represents the backpack volume, p j Representing the active output, d, of distributed power supply j i Representing the load i active demand, WL i Representing the load weight, x i Representing a binary vector, reflecting by 0 and 1 whether the load is cut off, f x Representing the load shedding objective function.
7. The islanding method for the power distribution network comprising the distributed power supply according to claim 1, wherein the islanding method comprises the following steps: establishing an island division function by taking the minimization of the power transmission cost as a target, wherein the obtained result is a plurality of distributed power supply-load pairs after the solution is completed, and the distributed power supply, the corresponding load and a line between the distributed power supply and the corresponding load form a single island; traversing all distributed power supplies to finish primary island division, comprising:
in the above formula: x is the number of ij For transferring power from source j to load i, c ij For transmission power cost, p j Representing the active output, d, of distributed power supply j i The number of the distributed power supplies is m.
8. The islanding method for the power distribution network comprising the distributed power supply according to claim 1, wherein the islanding method comprises the following steps: the optimal load flow calculation function is formulated, and the method comprises the steps of adjusting part of controllable loads, secondarily optimizing and adjusting an island scheme, and outputting a final island division result;
in the above formula: f. of ad Representing a controllable load adjustment objective function, p j Representing the active output of the distributed power supply j, d i Indicating the load i active demand, d c Denotes the uncontrollable load, u c Representing uncontrollable load, dq i Expressing the reactive demand of the load i, wherein alpha and beta are distributed power supply cost coefficients; c represents a load controllable part; u indicates whether the part load is controllable; v represents the bus voltage; y represents the line impedance; b represents a bus set; d represents a load set; g represents a distributed power supply set, theta represents a bus voltage phase angle, UCL represents an uncontrollable load set, CL represents a controllable load set, and k and e represent buses;
representing the maximum output of the distributed power supply; v min And V max Representing the bus voltage limit.
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| US9660451B1 (en) * | 2010-11-29 | 2017-05-23 | Sunpower Corporation | Islanded operation of distributed power sources |
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| US9660451B1 (en) * | 2010-11-29 | 2017-05-23 | Sunpower Corporation | Islanded operation of distributed power sources |
| CN104466948A (en) * | 2014-11-13 | 2015-03-25 | 国家电网公司 | Multi-microgrid system island partitioning method based on electrical coupling degrees |
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