CN116404633B - Method, equipment and medium for optimizing power flow of distribution network before overhaul based on phase shifter - Google Patents
Method, equipment and medium for optimizing power flow of distribution network before overhaul based on phase shifter Download PDFInfo
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- CN116404633B CN116404633B CN202310184993.1A CN202310184993A CN116404633B CN 116404633 B CN116404633 B CN 116404633B CN 202310184993 A CN202310184993 A CN 202310184993A CN 116404633 B CN116404633 B CN 116404633B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005457 optimization Methods 0.000 claims abstract description 36
- 238000012423 maintenance Methods 0.000 claims abstract description 8
- 230000002068 genetic effect Effects 0.000 claims abstract description 4
- 230000006870 function Effects 0.000 claims description 30
- 238000004590 computer program Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 abstract description 6
- 230000003287 optical effect Effects 0.000 description 3
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Classifications
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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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- 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]
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
Abstract
The invention relates to the technical field of power systems, in particular to a method, equipment and medium for optimizing power flow of a distribution network before overhaul based on a phase shifter, wherein the method comprises the following steps: according to the structure of the power distribution network, a power distribution network model is established; determining a circuit needing ring closing before maintenance, and additionally arranging amplitude-phase controllable phase shifters on the circuits on two sides of the ring closing; establishing a power distribution network power flow optimization model based on an amplitude-phase controllable phase shifter; and carrying out power flow optimization by using a genetic algorithm, and outputting a power flow optimization result. According to the invention, the loop closing safety is considered in the power flow optimization process of the power distribution network, and the amplitude-phase controllable phase shifter is added, so that the active network loss of the system is reduced, the safety of loop closing operation is ensured, the impact of loop closing current on the system is reduced, and the safe operation of the power distribution network is effectively ensured.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a method, equipment and medium for optimizing power flow of a distribution network before overhaul based on a phase shifter.
Background
The optimal power flow (Optimal Power Flow, OPF) is realized by adjusting control variables in the system under given power system structural parameters and loads, so that specific system operation and safety constraint conditions are met, and a preset system performance index reaches an optimal stable power flow operation state. Research on the optimal power flow problem is largely divided into two aspects: on the one hand, constraint conditions and optimization targets are added in an optimal power flow model, such as a unit combination problem, dynamic reactive power constraint and the like, and the engineering problem of a large-scale power system is analyzed and solved.
With the increasing importance of economic and safe operation of power systems, how to reduce network loss, improve power quality and increase economic benefit has become a practical problem for power departments.
The maintenance of equipment and lines is an important link in the planning and operation of a power system, and load transfer is often required before the maintenance, so that the loop closing operation of the lines can be involved. Because the voltage difference at two sides of the loop is present, loop closing impact current can be generated, the loop closing impact current is out of limit, the loop closing failure can be caused, the electric power system is greatly damaged, and the voltage difference at two sides of the loop closing circuit is controlled within a safe range, so that the practical problem is necessarily considered.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a method, equipment and medium for optimizing power flow of a distribution network before overhaul based on a phase shifter, and accordingly the problems in the background technology are effectively solved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a power flow optimization method of a distribution network before overhaul based on a phase shifter comprises the following steps:
according to the structure of the power distribution network, a power distribution network model is established;
determining a circuit needing ring closing before maintenance, and additionally arranging amplitude-phase controllable phase shifters on the circuits on two sides of the ring closing;
establishing a power distribution network power flow optimization model based on an amplitude-phase controllable phase shifter;
and carrying out power flow optimization by using a genetic algorithm, and outputting a power flow optimization result.
Further, the objective function of the power distribution network power flow optimization model is as follows:
the first term on the right of the function is the active network loss of the power distribution network; the second item and the third item on the right are respectively the amplitude difference and the phase difference of the voltages at two sides of each loop closing circuit, and are added into a target in a penalty function mode; u (U) i ，U j Respectively representing node voltages at i and j; g ij ，B ij Respectively representing the conductance and susceptance of the line ij;representing the voltage phase difference of nodes i, j; delta U represents the average value of the sum of squares of node voltage amplitude differences at two sides of n closed loop lines; u (U) imax 、U imin Respectively representing the maximum value and the minimum value allowed by the node voltage; />The average value of the square sum of the node voltage phase differences at two sides of the n closed loop lines is represented; />Respectively representing the maximum value and the minimum value of the node voltage phase; sigma (sigma) 1 As a penalty function coefficient, σ, of voltage amplitude 2 Is a penalty function coefficient for the voltage phase.
Further, in the objective function, the target function,
the penalty function coefficient sigma of the voltage amplitude 1 Increasing with the increase of iteration algebra; the penalty function coefficient sigma of the voltage phase 2 Taking 0.5.
Further, the power distribution network power flow optimization model includes: power balance constraint, amplitude-phase controllable phase shifter constraint, generator voltage constraint, reactive compensation constraint and loop closing line constraint.
Further, the power balancing constraint includes:
wherein P is i 、Q i Representing the active and reactive inputs at node i, respectively; u (U) i 、U j Representing the voltages at node i and node j, respectively; g ij ，B ij Respectively representing the conductance and susceptance of the line ij;the voltage phase difference at nodes i, j is shown.
Further, the amplitude phase controllable phase shifter constraint includes:
-13≤T 1 ≤13，T 1 ∈N
-13≤T 2 ≤13，T 2 ∈N
wherein,an angle value adjusted for the controllable phase shifter; k is the multiple of the voltage regulation of the controllable phase shifter; t (T) 1 、T 2 The configuration values of the controllable phase shifter are respectively used for adjusting the phase angle and the amplitude of the voltage; u (U) 1 、U 2 The voltage values at two sides of the controllable phase shifter are respectively.
Further, the generator voltage constraint includes:
V Gmin ≤V G ≤V Gmax
wherein V is G Is the terminal voltage of the generator, V Gmax 、V Gmin The upper and lower limits of the generator voltage, respectively.
Further, the reactive compensation constraint includes:
Q cimin ≤Q ci ≤Q cimax
wherein Q is ci For reactive compensation at node i, Q cimax 、Q cimin The upper and lower limits of reactive compensation, respectively.
Further, the closed loop circuit constraint includes:
|△U*|≤0.05
wherein DeltaU,The per unit value and the phase difference of the voltage difference between the nodes on both sides of the loop closing line are shown.
Further, the power flow optimization result comprises the minimum net loss value P obtained by optimization loss And optimal parameters for the minimum network loss, wherein the optimal parameters comprise: configuration value T of phase shifter 1 、T 2 Terminal voltage V of generator G Reactive compensation Q at node i ci 。
The invention also includes a computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the method as described above when executing the computer program.
The invention also includes a storage medium having stored thereon a computer program which, when executed by a processor, implements a method as described above.
The beneficial effects of the invention are as follows: the invention considers the safety of loop closing in the process of power flow optimization of the power distribution network, and adds the amplitude-phase controllable phase shifter, thereby reducing the active network loss of the system, simultaneously ensuring the safety of loop closing operation, reducing the impact of loop closing current on the system and effectively ensuring the safe operation of the power distribution network.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings may be obtained according to the drawings without inventive effort to those skilled in the art.
FIG. 1 is a flow chart of the method of the present invention;
fig. 2 is a schematic structural diagram of a computer device according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments.
As shown in fig. 1: a power flow optimization method of a distribution network before overhaul based on a phase shifter comprises the following steps:
according to the structure of the power distribution network, a power distribution network model is established;
determining a circuit needing ring closing before maintenance, and additionally arranging amplitude-phase controllable phase shifters on the circuits on two sides of the ring closing;
establishing a power distribution network power flow optimization model based on an amplitude-phase controllable phase shifter;
and carrying out power flow optimization by using a genetic algorithm, and outputting a power flow optimization result.
By considering the safety of loop closing in the process of power flow optimization of the power distribution network and adding the amplitude-phase controllable phase shifter, the safety of loop closing operation is ensured while the active network loss of the system is reduced, the impact of loop closing current on the system is reduced, and the safe operation of the power distribution network is effectively ensured.
The circuit needing to be closed before maintenance is a circuit which is not put into operation when the power distribution network actually runs and is mainly used for maintaining load transfer before maintenance, and the amplitude phase difference of node voltages at two sides of the closed loop is required to be pre-adjusted in consideration of the safety of the closed loop operation.
In this embodiment, the objective function of the power distribution network power flow optimization model is:
the first term on the right of the function is the active network loss of the power distribution network; the second item and the third item on the right are respectively the amplitude difference and the phase difference of the voltages at two sides of each loop closing circuit, and are added into a target in a penalty function mode; u (U) i ，U j Respectively representing node voltages at i and j; g ij ，B ij Respectively representing the conductance and susceptance of the line ij;representing the voltage phase difference of nodes i, j; delta U represents the average value of the sum of squares of node voltage amplitude differences at two sides of n closed loop lines; u (U) imax 、U imin Respectively representing the maximum value and the minimum value allowed by the node voltage; />The average value of the square sum of the node voltage phase differences at two sides of the n closed loop lines is represented; />Respectively representing the maximum value and the minimum value of the node voltage phase; sigma (sigma) 1 As a penalty function coefficient, σ, of voltage amplitude 2 Is a penalty function coefficient for the voltage phase.
In this embodiment, the target function, in the objective function,
penalty function coefficient sigma of voltage amplitude 1 Increasing with the increase of iteration algebra; penalty function coefficient sigma for voltage phase 2 Taking 0.5.
As a preference of the above embodiment, the power distribution network power flow optimization model includes: power balance constraint, amplitude-phase controllable phase shifter constraint, generator voltage constraint, reactive compensation constraint and loop closing line constraint.
By establishing power balance constraint, amplitude-phase controllable phase shifter constraint, generator voltage constraint, reactive compensation constraint and loop closing circuit constraint in the power distribution network power flow optimization model, the optimal power flow is found in multiple constraints, and the operation of the power distribution network is effectively guaranteed.
Wherein the power balancing constraint comprises:
wherein P is i 、Q i Representing the active and reactive inputs at node i, respectively; u (U) i 、U j Representing the voltages at node i and node j, respectively; g ij ，B ij Respectively representThe conductance, susceptance of line ij;the voltage phase difference at nodes i, j is shown.
The amplitude and phase controllable phase shifter constraint includes:
-13≤T 1 ≤13，T 1 ∈N
-13≤T 2 ≤13，T 2 ∈N
wherein,an angle value adjusted for the controllable phase shifter; k is the multiple of the voltage regulation of the controllable phase shifter; t (T) 1 、T 2 The configuration values of the controllable phase shifter are respectively used for adjusting the phase angle and the amplitude of the voltage; u (U) 1 、U 2 The voltage values at two sides of the controllable phase shifter are respectively.
The generator voltage constraints include:
V Gmin ≤V G ≤V Gmax
wherein V is G Is the terminal voltage of the generator, V Gmax 、V Gmin The upper and lower limits of the generator voltage, respectively.
Reactive compensation constraints include:
Q cimin ≤Q ci ≤Q cimax
wherein Q is ci For reactive compensation at node i, Q cimax 、Q cimin The upper and lower limits of reactive compensation, respectively.
The closed loop circuit constraint includes:
|△U*|≤0.05
wherein DeltaU,The per unit value and the phase difference of the voltage difference between the nodes on both sides of the loop closing line are shown.
In this embodiment, the power flow optimization result includes the minimum net loss value P obtained by optimization loss And an optimal parameter when the network loss is minimum, wherein the optimal parameter comprises: configuration value T of phase shifter 1 、T 2 Terminal voltage V of generator G Reactive compensation Q at node i ci 。
The invention considers the safety of loop closing in the process of power flow optimization of the power distribution network, and adds the amplitude-phase controllable phase shifter, thereby reducing the active network loss of the system, simultaneously ensuring the safety of loop closing operation, reducing the impact of loop closing current on the system and effectively ensuring the safe operation of the power distribution network.
Please refer to fig. 2, which illustrates a schematic structural diagram of a computer device provided in an embodiment of the present application. The embodiment of the present application provides a computer device 400, including: a processor 410 and a memory 420, the memory 420 storing a computer program executable by the processor 410, which when executed by the processor 410 performs the method as described above.
The present embodiment also provides a storage medium 430, on which storage medium 430 a computer program is stored which, when executed by the processor 410, performs a method as above.
The storage medium 430 may be implemented by any type or combination of volatile or nonvolatile Memory devices, such as a static random access Memory (Static Random Access Memory, SRAM), an electrically erasable Programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), an erasable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a Programmable Read-Only Memory (PROM), a Read-Only Memory (ROM), a magnetic Memory, a flash Memory, a magnetic disk, or an optical disk.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily for the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and further implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. The power flow optimization method of the distribution network before overhaul based on the phase shifter is characterized by comprising the following steps of:
according to the structure of the power distribution network, a power distribution network model is established;
determining a circuit needing ring closing before maintenance, and additionally arranging amplitude-phase controllable phase shifters on the circuits on two sides of the ring closing;
establishing a power distribution network power flow optimization model based on an amplitude-phase controllable phase shifter;
carrying out power flow optimization by using a genetic algorithm, and outputting a power flow optimization result;
the objective function of the power distribution network power flow optimization model is as follows:
the first term on the right of the function is the active network loss of the power distribution network; the second item and the third item on the right are respectively the amplitude difference and the phase difference of the voltages at two sides of each loop closing circuit, and are added into a target in a penalty function mode; u (U) i ，U j Respectively representing node voltages at i and j; g ij ，B ij Respectively representing the conductance and susceptance of the line ij;representing the voltage phase difference of nodes i, j; delta U represents the average value of the sum of squares of node voltage amplitude differences at two sides of n closed loop lines; u (U) imax 、U imin Respectively representing the maximum value and the minimum value allowed by the node voltage; />The average value of the square sum of the node voltage phase differences at two sides of the n closed loop lines is represented; />Respectively representing the maximum value and the minimum value of the node voltage phase; sigma (sigma) 1 As a penalty function coefficient, σ, of voltage amplitude 2 Penalty function coefficients for voltage phase;
the power distribution network power flow optimization model comprises the following steps: power balance constraint, amplitude-phase controllable phase shifter constraint, generator voltage constraint, reactive compensation constraint and loop closing circuit constraint;
the amplitude and phase controllable phase shifter constraint includes:
-13≤T 1 ≤13，T 1 ∈N
-13≤T 2 ≤13，T 2 ∈N
wherein,an angle value adjusted for the controllable phase shifter; k is the multiple of the voltage regulation of the controllable phase shifter; t (T) 1 、T 2 The configuration values of the controllable phase shifter are respectively used for adjusting the phase angle and the amplitude of the voltage; u (U) 1 、U 2 The voltage values at two sides of the controllable phase shifter are respectively.
2. The method for optimizing power flow in a pre-service distribution network based on a phase shifter according to claim 1, wherein, in the objective function,
the penalty function coefficient sigma of the voltage amplitude 1 Increasing with the increase of iteration algebra; the penalty function coefficient sigma of the voltage phase 2 Taking 0.5.
3. The phase shifter-based pre-overhaul power distribution network flow optimization method of claim 1, wherein the power balancing constraints include:
wherein P is i 、Q i Representing the active and reactive inputs at node i, respectively; u (U) i 、U j Representing the voltages at node i and node j, respectively; g ij ，B ij Respectively representing the conductance and susceptance of the line ij;the voltage phase difference at nodes i, j is shown.
4. The phase shifter-based pre-overhaul power distribution network power flow optimization method of claim 1, wherein the generator voltage constraints include:
V Gmin ≤V G ≤V Gmax
wherein V is G Is the terminal voltage of the generator, V Gmax 、V Gmin The upper and lower limits of the generator voltage, respectively.
5. The phase shifter-based pre-overhaul power distribution network power flow optimization method of claim 1, wherein the reactive compensation constraint comprises:
Q cimin ≤Q ci ≤Q cimax
wherein Q is ci For reactive compensation at node i, Q cimax 、Q cimin The upper and lower limits of reactive compensation, respectively.
6. The phase shifter-based pre-overhaul power distribution network power flow optimization method of claim 1, wherein the loop closing line constraints include:
|△U*|≤0.05
wherein DeltaU,The per unit value and the phase difference of the voltage difference between the nodes on both sides of the loop closing line are shown.
7. The method for optimizing the power flow of a pre-overhaul power distribution network based on a phase shifter according to any one of claims 1 to 6, characterized in that the power flow optimization result comprises optimizing the obtained minimum loss value P loss And optimal parameters for the minimum network loss, wherein the optimal parameters comprise: configuration value T of phase shifter 1 、T 2 Terminal voltage V of generator G Reactive compensation Q at node i ci 。
8. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any of claims 1-7 when executing the computer program.
9. A storage medium having stored thereon a computer program which, when executed by a processor, implements the method of any of claims 1-7.
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| CN104410068A (en) * | 2014-12-01 | 2015-03-11 | 国网上海市电力公司 | Method for collocation optimization and operation control of controlled phase shifters |
| CN109390929A (en) * | 2017-08-11 | 2019-02-26 | 郑州大学 | A kind of accurate idle work optimization method counted and small interference stability constrains |
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