CN115912493A - Distributed power supply access method, electronic equipment, power distribution network and storage medium - Google Patents
Distributed power supply access method, electronic equipment, power distribution network and storage medium Download PDFInfo
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Abstract
The invention provides a distributed power supply access method, electronic equipment, a power distribution network and a storage medium, wherein a plurality of first access position sequences of distributed power supplies to be accessed are obtained; then, according to multiple preset fault combinations of the distributed power supplies, removing the fault distributed power supplies in each first access position sequence to obtain multiple second access position sequences corresponding to each first access position sequence; sequentially determining the stability parameters of the target power distribution network when each first access position sequence of the accessed distributed power supply is changed into each second access position sequence, and obtaining the stability parameter sequence of each first access position sequence; and finally, selecting a first access position sequence as an optimal access position according to the stability parameter sequence. The stability of the power grid is evaluated by calculating the power grid change before and after photovoltaic disconnection, so that the access positions of the distributed power supplies are optimized, namely, each distributed power supply is accessed to a node with the minimum influence on the power grid, and the stability of the power distribution network caused by photovoltaic disconnection can be effectively prevented from being lowered.
Description
Technical Field
The invention belongs to the technical field of distributed power supply access, and particularly relates to a distributed power supply access method, electronic equipment, a power distribution network and a storage medium.
Background
The main development trend of photovoltaic power generation is photovoltaic power generation grid connection, but the power generation mode of a photovoltaic power supply is different from that of the traditional energy, the original structure of a power distribution network is changed by photovoltaic access, and certain negative influence is certainly caused on the power distribution network by large-scale grid connection. The output of the photovoltaic power supply has fluctuation and randomness, and the voltage fluctuation and voltage flicker of a power grid are easily caused; harmonic current can be generated when the photovoltaic inverter is frequently closed and the switching tube is opened, so that harmonic pollution is caused; the photovoltaic grid connection can increase the voltage level of a power distribution network, and the node voltage is easy to exceed the limit; the photovoltaic access capacity is too large, so that the power flow can flow reversely, and the stability of a power system is reduced.
However, due to the uncertainty of the distributed photovoltaic power supply, the grid is prone to generate large fluctuation when a photovoltaic fault is disconnected. At present, the optimization is usually carried out by taking the highest electric energy quality as a target when large-scale photovoltaic grid connection is carried out, and the reduction of the stability of a power distribution network caused by photovoltaic failure grid disconnection cannot be avoided.
Disclosure of Invention
In view of this, the invention provides a distributed power supply access method, an electronic device, a power distribution network and a storage medium, and aims to solve the problem that the stability of the power distribution network is reduced due to the fact that photovoltaic faults are disconnected in the prior art.
A first aspect of an embodiment of the present invention provides a distributed power source access method, including:
acquiring a plurality of first access position sequences of each distributed power supply to be accessed; the first access position sequences are obtained by optimizing network parameters of nodes of a target power distribution network accessed by a distributed power supply according to a particle swarm optimization algorithm and by taking the highest electric energy quality of the target power distribution network as a target;
according to multiple preset fault combinations of the distributed power supplies, removing the fault distributed power supplies in each first access position sequence to obtain multiple second access position sequences corresponding to each first access position sequence;
sequentially determining the stability parameters of the target power distribution network when each first access position sequence of the accessed distributed power supply is changed into each second access position sequence, and obtaining the stability parameter sequence of each first access position sequence;
and selecting a first access position sequence as the optimal access position of each distributed power supply to be accessed according to the stability parameter sequence.
A second aspect of the embodiments of the present invention provides a distributed power supply access apparatus, including:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a plurality of first access position sequences of distributed power supplies to be accessed; the first access position sequences are obtained by optimizing network parameters of nodes of a target power distribution network accessed by a distributed power supply according to a particle swarm optimization algorithm and by taking the highest electric energy quality of the target power distribution network as a target;
the removing module is used for removing the distributed power supplies with faults in the first access position sequences according to various preset fault combinations of the distributed power supplies to obtain a plurality of second access position sequences corresponding to each first access position sequence;
the calculation module is used for sequentially determining the stability parameters of the target power distribution network when each first access position sequence of the accessed distributed power supply is changed into each second access position sequence, and obtaining the stability parameter sequence of each first access position sequence;
and the determining module is used for selecting the first access position sequence as the optimal access position of each distributed power supply to be accessed according to the stability parameter sequence.
A third aspect of embodiments of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the distributed power access method according to the first aspect when executing the computer program.
A fourth aspect of the embodiments of the present invention provides a power distribution network, including the electronic device according to the third aspect.
A fifth aspect of embodiments of the present invention provides a computer-readable storage medium, which stores a computer program that, when executed by a processor, implements the steps of the distributed power access method of the first aspect.
According to the distributed power supply access method, the electronic device, the power distribution network and the storage medium, a plurality of first access position sequences of each distributed power supply to be accessed are obtained; the first access position sequences are obtained by optimizing network parameters of nodes of a target power distribution network accessed by a distributed power supply according to a particle swarm optimization algorithm and by taking the highest electric energy quality of the target power distribution network as a target; then, according to multiple preset fault combinations of the distributed power supplies, removing the fault distributed power supplies in each first access position sequence to obtain multiple second access position sequences corresponding to each first access position sequence; sequentially determining the stability parameters of the target power distribution network when each first access position sequence of the accessed distributed power supply is changed into each second access position sequence, and obtaining the stability parameter sequence of each first access position sequence; and finally, selecting a first access position sequence according to the stability parameter sequence to serve as the optimal access position of each distributed power supply to be accessed. The stability of the power grid is evaluated only by calculating the power grid change before and after the photovoltaic off-line, so that the access positions of the distributed power supplies are optimized, namely, each distributed power supply is accessed to a node with the minimum influence on the power grid, and the stability of the power distribution network caused by the photovoltaic off-line can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is an application scenario diagram of a distributed power access method provided in an embodiment of the present invention;
fig. 2 is a flowchart of an implementation of a distributed power access method provided by an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a distributed power access apparatus according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Fig. 1 is a diagram of an application scenario of a distributed power access method according to an embodiment of the present invention. As shown in fig. 1, in some embodiments, the distributed power access method provided by the embodiment of the present invention may be applied to the application scenario, but is not limited thereto. In this embodiment of the invention, the system comprises: a plurality of distributed power sources 11 and a target distribution grid 12 with electronic equipment.
When the distributed power sources 11 are connected to the target power distribution network 12, the connection capacity of the distributed power sources is reported to the electronic equipment of the target power distribution network 12, then the electronic equipment performs load flow calculation according to the connection capacity and the initial connection position, and then the connection position is optimized to determine the final connection position of each distributed power source 11.
The distributed power source 11 may be a photovoltaic power source, a wind power source, etc., and is not limited thereto. The electronic device 12 may be a server, such as a server of a dispatch center, or may be a terminal installed in the target distribution network 12, which is not limited herein.
Fig. 2 is a flowchart of an implementation of a distributed power access method according to an embodiment of the present invention. As shown in fig. 2, in some embodiments, the distributed power access method is applied to the electronic devices in the target distribution network 12 shown in fig. 1, and the method includes:
s210, acquiring a plurality of first access position sequences of each distributed power supply to be accessed; the plurality of first access position sequences are obtained by optimizing network parameters of nodes of a target power distribution network accessed by a distributed power supply according to a particle swarm optimization algorithm and by taking the highest electric energy quality of the target power distribution network as a target.
In the embodiment of the present invention, when the access location is calculated, the influence on the power quality of the target distribution network after accessing the target distribution network needs to be considered preferentially, and finally, a plurality of access schemes with small influence on the power quality, that is, the plurality of first access location sequences, are obtained.
And S220, removing the distributed power supplies with faults in the first access position sequences according to multiple preset fault combinations of the distributed power supplies to obtain multiple second access position sequences corresponding to each first access position sequence.
In the prior art, only the influence of a distributed power supply on a target power distribution network in an access process is generally considered, but due to the randomness and instability of the distributed power supply, situations such as fault disconnection and the like often occur, and certain influence is inevitably caused on the target power distribution network when the distributed power supply is disconnected. For example, there are two access schemes for the distributed power supplies A1-A3, namely scheme 1 and scheme 2, and there are 6 preset fault combinations, namely fault 1-fault 6, so that 2 × 6 second access position sequences can be obtained.
And S230, sequentially determining the stability parameters of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence, and obtaining the stability parameter sequence of each first access position sequence.
In the embodiment of the invention, the power grid stability of the scheme 1-fault 1, the scheme 1-fault 2, the scheme 2-fault 1, and the scheme 2-fault 6 is determined in sequence, and the stability parameter sequences of the scheme 1 and the scheme 2 can be obtained.
And S240, selecting the first access position sequence as the optimal access position of each distributed power supply to be accessed according to the stability parameter sequence.
In the embodiment of the invention, the stability parameter sequences of the scheme 1 and the scheme 2 can be evaluated, and the scheme with higher stability is selected as the optimal access position, so that the stability of the power distribution network accessing the distributed power supply is provided.
In the embodiment of the invention, the stability of the power grid is evaluated by calculating the change of the power grid before and after photovoltaic disconnection, so that the access positions of the distributed power supplies are optimized, namely, each distributed power supply is accessed to the node with the minimum influence on the power grid, and the reduction of the stability of the power distribution network caused by photovoltaic disconnection can be effectively avoided.
In some embodiments, S230 may include: acquiring the access capacity of each distributed power supply to be accessed; load flow calculation is carried out according to the access capacity of each distributed power supply to be accessed and the network parameters of each node of the target power distribution network, and the first voltage and the first power of each node of the target power distribution network are determined when each first access position sequence is accessed to the target power distribution network; load flow calculation is carried out according to the access capacity of each distributed power supply to be accessed and the network parameters of each node of the target power distribution network, and second voltage and second power of each node of the target power distribution network are determined when each second access position sequence is accessed to the target power distribution network; and determining the stability parameter of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence according to the first voltage and the first power corresponding to each first access position sequence and the plurality of second voltages and the second powers corresponding to each first access position sequence, and obtaining the stability parameter sequence of each first access position sequence.
In the embodiment of the invention, the power grid load flow of the target power distribution network accessed according to each first access position sequence is calculated, the voltage and power data are determined, then the power grid load flow of the target power distribution network under different photovoltaic off-line conditions is calculated, the voltage and power data are re-determined, and finally the influence of the accessed distributed power supply on the stability of the power distribution network is determined according to the change of the voltage and the power before and after off-line, so that the optimal access scheme is selected.
In some embodiments, the stability parameters include an active power loss reduction value, a change value of a voltage profile, and a voltage stability index.
Correspondingly, determining a stability parameter of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence according to the first voltage and the first power corresponding to each first access position sequence and the plurality of second voltages and the second powers corresponding to each first access position sequence, includes: determining an active power loss reduction value of the target power distribution network when each first access position sequence is changed into each second access position sequence according to the first power corresponding to each first access position sequence and a plurality of second powers corresponding to each first access position sequence; determining a change value of voltage distribution of the target power distribution network when each first access position sequence is changed into each second access position sequence according to a first voltage corresponding to each first access position sequence and a plurality of second voltages corresponding to each first access position sequence; and determining a voltage stability index of the target power distribution network when each first access position sequence becomes each second access position sequence.
In the embodiment of the invention, the first access position sequence corresponds to an access scheme before the network disconnection, and the second access position sequence corresponds to an access scheme after the network disconnection.
The active power loss reduction value may be calculated by:
wherein s is 1 For active power loss reduction value, P ai Is the power of the ith node before photovoltaic off-line, P bi And L is the power of the ith node after the photovoltaic is off-line, and is the total number of nodes of the target power distribution network.
The variation value of the voltage distribution can be calculated by the following equation:
wherein s is 2 Is a voltageChange value of distribution, V ai Voltage of i-th node before photovoltaic off-line, V bi Is the voltage, V, of the ith node after photovoltaic off-line ci Is the reference voltage of the ith node.
The voltage stability index can be calculated by:
wherein s is 3 For voltage stability index, node j is a node adjacent to node i, Δ V i Is the voltage difference, delta P, of node i before and after photovoltaic off-grid j Is the active power difference, delta Q, of the node j before and after the photovoltaic off-line j Is the reactive power difference, X, of the node j before and after photovoltaic off-line ij Is the reactance between node i and node j, R ij Is the resistance between node i and node j.
In some embodiments, the distributed power access method further comprises: and randomly setting the failed distributed power supply according to a Monte Carlo algorithm to obtain a plurality of preset fault combinations.
In the embodiment of the invention, after the stability parameter sequence of each first access position sequence is obtained according to the preset fault combination determined randomly, the stability evaluation values are obtained by weighting and summing the stability parameter values in the stability parameter sequence corresponding to each first access position sequence, then the stability evaluation values of the first access position sequences are compared, and the first access position sequence with the largest stability evaluation value is selected as the optimal access position of each first access position sequence.
In some embodiments, the distributed power access method further comprises: acquiring historical fault data of each distributed power supply in a historical period; determining the fault probability of each distributed power supply according to historical fault data of each distributed power supply in a historical time period; and setting the faulted distributed power supply according to the fault probability to obtain a plurality of preset fault combinations.
In the embodiment of the invention, faults can be randomly selected firstly to obtain distributed power supply combinations with multiple faults, each distributed power supply combination with the faults is given a certain weight according to the corresponding fault probability to obtain multiple preset fault combinations with the weights, and when the stability evaluation value is calculated, the weighting is not carried out any more, but is carried out according to the weights of the preset fault combinations.
In some embodiments, the distributed power access method further comprises: acquiring initial access positions of distributed power supplies to be accessed; and performing multi-objective optimization according to a particle swarm optimization algorithm and a preset fitness threshold by taking data reflecting the quality of the electric energy, such as voltage distribution, voltage distortion, static voltage stability, system network loss and the like as indexes to obtain a plurality of first access position sequences.
In the embodiment of the invention, considering that the photovoltaic access has great influence on the voltage distribution, the voltage distortion, the static voltage stability and the system network loss of the power distribution network, a multi-target optimization configuration model is constructed by the four indexes, the comprehensive weight of each index is obtained by using an entropy weight method and a principal component analysis method, then the optimization is carried out by using a particle swarm optimization algorithm, the fitness threshold value is set, the access position sequence meeting the fitness threshold value is output as a better result, and a plurality of first access position sequences are obtained.
In some embodiments, the distributed power access method further comprises: determining the maximum bearing capacity of each node of a target power distribution network according to a pre-established photovoltaic bearing capacity model; and determining the initial access position of each distributed power supply to be accessed according to the maximum bearing capacity of each node of the target power distribution network and the access capacity of each distributed power supply to be accessed.
In the embodiment of the invention, on the basis of fully considering the limiting factor of the distributed photovoltaic bearing capacity in the power distribution network, a photovoltaic bearing capacity model with a target function of maximum configurable node distributed photovoltaic access capacity and constraint conditions of tidal current equation constraint, voltage deviation and fluctuation constraint, harmonic current constraint, line thermal constraint, distributed photovoltaic output constraint and reverse power constraint can be constructed, and then the maximum bearing capacity of each node of the target power distribution network is determined by the model, so that the maximum bearing capacity of the node is not exceeded when the distributed power supply is accessed according to the initial access position and the optimal access position obtained after subsequent optimization.
In conclusion, the beneficial effects of the invention are as follows: the stability of the power grid is evaluated by calculating the power grid change before and after photovoltaic disconnection, so that the access positions of the distributed power supplies are optimized, namely, each distributed power supply is accessed to a node with the minimum influence on the power grid, and the stability of the power distribution network caused by photovoltaic disconnection can be effectively prevented from being lowered.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 3 is a schematic structural diagram of a distributed power access apparatus according to an embodiment of the present invention. As shown in fig. 3, in some embodiments, a distributed power access apparatus includes:
the system comprises an acquisition module, a storage module and a control module, wherein the acquisition module is used for acquiring a plurality of first access position sequences of distributed power supplies to be accessed; the plurality of first access position sequences are obtained by optimizing network parameters of nodes of a target power distribution network accessed by a distributed power supply according to a particle swarm optimization algorithm and by taking the highest electric energy quality of the target power distribution network as a target.
And the removing module is used for removing the distributed power supplies with faults in the first access position sequences according to various preset fault combinations of the distributed power supplies to obtain a plurality of second access position sequences corresponding to each first access position sequence.
And the calculation module is used for sequentially determining the stability parameters of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence, so as to obtain the stability parameter sequence of each first access position sequence.
And the determining module is used for selecting the first access position sequence as the optimal access position of each distributed power supply to be accessed according to the stability parameter sequence.
Optionally, the computing module is specifically configured to obtain access capacity of each distributed power source to be accessed; load flow calculation is carried out according to the access capacity of each distributed power supply to be accessed and the network parameters of each node of the target power distribution network, and the first voltage and the first power of each node of the target power distribution network are determined when each first access position sequence is accessed to the target power distribution network; load flow calculation is carried out according to the access capacity of each distributed power supply to be accessed and the network parameters of each node of the target power distribution network, and second voltage and second power of each node of the target power distribution network are determined when each second access position sequence is accessed to the target power distribution network; and determining the stability parameter of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence according to the first voltage and the first power corresponding to each first access position sequence and the plurality of second voltages and the second powers corresponding to each first access position sequence, and obtaining the stability parameter sequence of each first access position sequence.
Optionally, the stability parameter includes an active power loss reduction value, a voltage distribution variation value, and a voltage stability index. Correspondingly, the calculation module is specifically configured to determine, according to the first power corresponding to each first access position sequence and the plurality of second powers corresponding to each first access position sequence, an active power loss reduction value of the target power distribution network when each first access position sequence becomes each second access position sequence; determining a change value of voltage distribution of the target power distribution network when each first access position sequence is changed into each second access position sequence according to a first voltage corresponding to each first access position sequence and a plurality of second voltages corresponding to each first access position sequence; and determining a voltage stability index of the target power distribution network when each first access position sequence becomes each second access position sequence.
Optionally, the distributed power supply access apparatus further includes: and the fault simulation module is used for randomly setting the faulted distributed power supply according to the Monte Carlo algorithm to obtain a plurality of preset fault combinations.
Optionally, the distributed power supply access apparatus further includes: the fault simulation module is used for acquiring historical fault data of each distributed power supply in a historical time period; determining the fault probability of each distributed power supply according to historical fault data of each distributed power supply in a historical time period; and setting the faulted distributed power supply according to the fault probability to obtain a plurality of preset fault combinations.
Optionally, the distributed power supply access apparatus further includes: the optimization module is used for acquiring the initial access position of each distributed power supply to be accessed; and performing multi-objective optimization according to a particle swarm optimization algorithm and a preset fitness threshold value by taking data reflecting the quality of the electric energy, such as voltage distribution, voltage distortion, static voltage stability, system network loss and the like as indexes to obtain a plurality of first access position sequences.
Optionally, the distributed power supply access apparatus further includes: the initial position determining module is used for determining the maximum bearing capacity of each node of the target power distribution network according to a pre-established photovoltaic bearing capacity model; and determining the initial access position of each distributed power supply to be accessed according to the maximum bearing capacity of each node of the target power distribution network and the access capacity of each distributed power supply to be accessed.
The distributed power access apparatus provided in this embodiment may be used to implement the method embodiments described above, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. As shown in fig. 4, an electronic device 4 according to an embodiment of the present invention is an electronic device 4 including: a processor 40, a memory 41, and a computer program 42 stored in the memory 41 and executable on the processor 40. The processor 40, when executing the computer program 42, implements the steps in the various distributed power access method embodiments described above, such as steps 210-240 shown in fig. 2. Alternatively, processor 40, when executing computer program 42, implements the functionality of various modules/units in the various system embodiments described above, such as modules 310-340 in FIG. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units, which are stored in the memory 41 and executed by the processor 40 to implement the present invention. One or more of the modules/units may be a series of computer program instruction segments capable of performing specific functions that describe the execution of the computer program 42 in the electronic device 4.
The electronic device 4 may be a terminal or a server, where the terminal may be a mobile phone, an MCU, an ECU, and the like, and is not limited herein, and the server may be a physical server, a cloud server, and the like, and is not limited herein. The electronic device 4 may include, but is not limited to, a processor 40, a memory 41. Those skilled in the art will appreciate that fig. 4 is merely an example of the electronic device 4 and does not constitute a limitation of the electronic device 4 and may include more or less components than those shown, or combine certain components, or different components, e.g., the terminal may also include input-output devices, network access devices, buses, etc.
The Processor 40 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the electronic device 4, such as a hard disk or a memory of the electronic device 4. The memory 41 may also be an external storage device of the electronic device 4, such as a plug-in hard disk provided on the electronic device 4, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the memory 41 may also include both an internal storage unit of the electronic device 4 and an external storage device. The memory 41 is used for storing computer programs and other programs and data required by the terminal. The memory 41 may also be used to temporarily store data that has been output or is to be output.
Embodiments of the present invention provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the steps in the embodiments of the distributed power access method are implemented.
The computer-readable storage medium stores a computer program 42, where the computer program 42 includes program instructions, and the program instructions, when executed by the processor 40, implement all or part of the processes in the method of the embodiments, and may also be implemented by the computer program 42 instructing associated hardware, and the computer program 42 may be stored in a computer-readable storage medium, and the computer program 42, when executed by the processor 40, may implement the steps of the method embodiments. The computer program 42 comprises, inter alia, computer program code, which may be in the form of source code, object code, an executable file or some intermediate form. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer-readable medium may contain suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media excludes electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The computer readable storage medium may be an internal storage unit of the terminal of any of the foregoing embodiments, for example, a hard disk or a memory of the terminal. The computer readable storage medium may also be an external storage device of the terminal, such as a plug-in hard disk provided on the terminal, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. Further, the computer-readable storage medium may also include both an internal storage unit and an external storage device of the terminal. The computer-readable storage medium is used for storing a computer program and other programs and data required by the terminal. The computer-readable storage medium may also be used to temporarily store data that has been output or is to be output.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules, so as to perform all or part of the functions described above. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment has its own emphasis, and reference may be made to the related description of other embodiments for parts that are not described or recited in any embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other ways. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, a module or a unit may be divided into only one type of logical function, and may be implemented in another manner, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the embodiments of the present invention may also be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the embodiments of the method. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may include any suitable increase or decrease as required by legislation and patent practice in the jurisdiction, for example, in some jurisdictions, computer readable media may not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A distributed power access method, comprising:
acquiring a plurality of first access position sequences of each distributed power supply to be accessed; the plurality of first access position sequences are obtained by optimizing network parameters of nodes of a target power distribution network accessed by a distributed power supply according to a particle swarm optimization algorithm and by taking the highest electric energy quality of the target power distribution network as a target;
according to multiple preset fault combinations of the distributed power supplies, removing the fault distributed power supplies in each first access position sequence to obtain multiple second access position sequences corresponding to each first access position sequence;
sequentially determining the stability parameters of the target power distribution network when each first access position sequence of the accessed distributed power supply is changed into each second access position sequence, and obtaining the stability parameter sequence of each first access position sequence; and selecting a first access position sequence as the optimal access position of each distributed power supply to be accessed according to the stability parameter sequence.
2. The distributed power access method according to claim 1, wherein the sequentially determining the stability parameter of the target distribution network when the accessed distributed power is changed from each first access position sequence to each second access position sequence to obtain the stability parameter sequence of each first access position sequence comprises:
acquiring the access capacity of each distributed power supply to be accessed;
load flow calculation is carried out according to the access capacity of each distributed power supply to be accessed and the network parameters of each node of the target power distribution network, and the first voltage and the first power of each node of the target power distribution network are determined when each first access position sequence is accessed to the target power distribution network;
load flow calculation is carried out according to the access capacity of each distributed power supply to be accessed and the network parameters of each node of the target power distribution network, and second voltage and second power of each node of the target power distribution network are determined when each second access position sequence is accessed to the target power distribution network;
and determining the stability parameter of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence according to the first voltage and the first power corresponding to each first access position sequence and the plurality of second voltages and the plurality of second powers corresponding to each first access position sequence, so as to obtain the stability parameter sequence of each first access position sequence.
3. The distributed power access method of claim 2, wherein the stability parameters include an active power loss reduction value, a voltage distribution variation value, and a voltage stability index;
the determining the stability parameter of the target power distribution network when the accessed distributed power supply is changed from each first access position sequence to each second access position sequence according to the first voltage and the first power corresponding to each first access position sequence and the plurality of second voltages and the second powers corresponding to each first access position sequence comprises:
determining an active power loss reduction value of the target power distribution network when each first access position sequence is changed into each second access position sequence according to the first power corresponding to each first access position sequence and a plurality of second powers corresponding to each first access position sequence;
determining a change value of voltage distribution of the target power distribution network when each first access position sequence is changed into each second access position sequence according to a first voltage corresponding to each first access position sequence and a plurality of second voltages corresponding to each first access position sequence;
and determining a voltage stability index of the target power distribution network when each first access position sequence becomes each second access position sequence.
4. The distributed power access method of claim 1, further comprising:
and randomly setting the failed distributed power supply according to a Monte Carlo algorithm to obtain a plurality of preset fault combinations.
5. The distributed power access method of claim 1, further comprising:
acquiring historical fault data of each distributed power supply in a historical period;
determining the fault probability of each distributed power supply according to historical fault data of each distributed power supply in a historical time period;
and setting the faulted distributed power supply according to the fault probability to obtain a plurality of preset fault combinations.
6. The distributed power access method of claim 1, further comprising:
acquiring initial access positions of all distributed power supplies to be accessed;
and performing multi-objective optimization according to a particle swarm optimization algorithm and a preset fitness threshold by taking data reflecting the quality of the electric energy, such as voltage distribution, voltage distortion, static voltage stability, system network loss and the like as indexes to obtain a plurality of first access position sequences.
7. The distributed power access method of claim 6, further comprising:
determining the maximum bearing capacity of each node of a target power distribution network according to a pre-established photovoltaic bearing capacity model;
and determining the initial access position of each distributed power supply to be accessed according to the maximum bearing capacity of each node of the target power distribution network and the access capacity of each distributed power supply to be accessed.
8. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the distributed power access method of any one of claims 1 to 7 when executing the computer program.
9. An electrical distribution network comprising an electronic device as claimed in claim 8 above.
10. A computer readable storage medium, characterized in that the computer readable storage medium stores a computer program which, when executed by a processor, implements the steps of the distributed power access method of any of claims 1 to 7 above.
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