CN111416361B - Low-network-loss power distribution ring network open-loop operation site selection method - Google Patents

Low-network-loss power distribution ring network open-loop operation site selection method Download PDF

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CN111416361B
CN111416361B CN202010339514.5A CN202010339514A CN111416361B CN 111416361 B CN111416361 B CN 111416361B CN 202010339514 A CN202010339514 A CN 202010339514A CN 111416361 B CN111416361 B CN 111416361B
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power distribution
current
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reactive
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CN111416361A (en
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张宏俊
郝丽萍
胡慧
杜娟
付锡康
朱平
宋希静
李鹏
周湘云
林燕
瞿杨全
代自强
刘雨
彭仕伦
王银山
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Guizhou Power Grid Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

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Abstract

The invention discloses a low-loss power distribution ring network open-loop operation site selection method, which comprises the steps of obtaining an equivalent circuit of a power distribution ring network and introducing a flexible interconnection switch to divide the equivalent circuit into two systems; acquiring an initial line loss model of the power distribution network; acquiring a power distribution network line loss model; obtaining the optimal current active component and reactive component output by the flexible interconnection switch when the line loss is minimum according to a line loss mathematical expression of the power distribution network; obtaining the resistance distance, the active current moment and the reactive current moment of each node in the two divided systems; calculating the combined active current moment and the combined reactive current moment of the two systems, and obtaining the relation between the calculated combined active current moment and the optimal current active and reactive components; and determining the optimal opening point of the open-loop operation mode of the power distribution network with the minimum network loss as the target according to the optimal current active component. According to the invention, the relation between the distribution network loss and the load distribution imbalance can be obtained through the current combination moment, so that the optimal open-loop operation mode with the minimum distribution network loss is obtained.

Description

Low-network-loss power distribution ring network open-loop operation site selection method
Technical Field
The invention relates to the technical field of power dispatching control, in particular to a low-network-loss power distribution ring network open-loop operation site selection method.
Background
In recent years, domestic power grids mainly adopt a power supply mode of 'closed-loop design and open-loop operation', and the power supply method has the advantages that uninterrupted power supply of loads can be realized by adopting a closed-loop switching operation mode, so that the reliability and continuity of power supply are improved. The power distribution network is used as the final link of power production and supply, and the power of a transformer substation or a distributed power supply is transmitted to each user, so that the network structure is more complicated compared with a main network, and the number of elements of the power distribution network is large, so that the network loss of the power distribution network occupies a large proportion in the whole power supply cost. The network loss of the power distribution network is mainly the sum of the thermal power generated by the current flowing through each section of line, and when different opening points of the power distribution network operation modes are selected, the power flow distribution and the current flowing through each section of line are different, namely the network loss of the power distribution network is changed along with the change of the open-loop operation mode of the power distribution network.
The power distribution network loss is too large, the operation of the power distribution network can be influenced, and greater economic loss is caused to a power company, so that the power distribution network loss needs to be reduced as much as possible in practical application. Because the network loss of the power distribution network discretely changes along with the opening point or the power flow distribution, an iterative and more novel intelligent algorithm is mainly adopted to seek an optimal solution in the prior art, such as a particle swarm algorithm, a genetic algorithm, an ant colony algorithm and the like. However, the implementation procedure of the method is often limited to a specific power grid model, and the method has no universality and portability, cannot reveal the relevance between the network loss and the load distribution of the power distribution network, and is not beneficial to popularization and application.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned conventional problems.
Therefore, the technical problem solved by the invention is as follows: the method for selecting the site of the open-loop operation of the distribution ring network with low network loss can obtain the relation between the network loss of the distribution network and the unbalanced degree of load distribution through the current combination moment, so that the optimal open-loop operation mode with the minimum network loss of the distribution network is obtained.
In order to solve the technical problems, the invention provides the following technical scheme: a low-loss power distribution ring network open-loop operation site selection method comprises the steps of obtaining an equivalent circuit of a power distribution ring network and dividing the equivalent circuit into two systems by assuming that a flexible interconnection switch is introduced into a certain branch; assuming that the flexible interconnection switch is in a locked state, acquiring an initial line loss model of the power distribution network; supposing that the flexible interconnection switch adopts PQ control to participate in power flow regulation of the power distribution network, and obtaining a power distribution network line loss model when the flexible interconnection switch participates in the power flow regulation; obtaining the optimal current active component and reactive component output by the flexible interconnection switch when the line loss is minimum according to a line loss mathematical expression of the power distribution network; obtaining the resistance distance, the active current moment and the reactive current moment of each node in the two divided systems; calculating the total active current moment and the total reactive current moment of the two divided systems, and obtaining the relation between the total active current moment and the total reactive current moment and the optimal current active component and reactive component; and determining the optimal opening point of the open-loop operation mode of the power distribution network with the minimum network loss as the target according to the optimal current active component.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the expression of the initial line loss model is,
Figure BDA0002468062090000021
wherein，rAiAnd rBjResistance values, I, of branches I and j in two divided systems, respectivelyAPliAnd IAQliRespectively, the active and reactive components of the I current of the branch, IBPljAnd IBQljRespectively, the active component and the reactive component of the current of branch j.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the line loss model of the power distribution network when the flexible interconnection switch participates in the power flow regulation is as follows,
Figure BDA0002468062090000022
wherein, Delta IPAnd Δ IQThe active and reactive components of the current output by the flexible interconnection switch, R∑The total resistance of a main feeder line of the distribution ring network is shown, and n and m represent the number of two divided system nodes.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the optimal current active component and reactive component output by the flexible interconnection switch when the line loss is minimum are respectively,
Figure BDA0002468062090000023
Figure BDA0002468062090000024
as a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the blocking distance of each node in the two divided systems is expressed as,
Figure BDA0002468062090000031
wherein R isAiAnd RBjAre respectively nodes in two systemsi and j to the resistance distance, r, of the power supply point of the distribution networkAiAnd rBjThe resistance values of the branches i and j in the two systems are respectively.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the calculation formula of the active current moment of each node in the two divided systems is as follows,
Figure BDA0002468062090000032
wherein M isAPiAnd MBPjRespectively the active current moments, I, of nodes I and j in the two systemsAPiAnd IBPjThe active components of the load currents of the nodes i and j in the two systems are respectively.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the reactive current moment calculation formula of each node in the two divided systems is,
Figure BDA0002468062090000033
wherein M isAQiAnd MBQjReactive current moments, I, of nodes I and j in both systemsAQiAnd IBQjThe reactive components of the load current at nodes i and j in the two systems are respectively.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the calculation formula of the combined active current moment and the combined reactive current moment in the two divided systems is as follows,
Figure BDA0002468062090000034
Figure BDA0002468062090000035
wherein M isAPSAnd MBPSThe resultant active current moments, M, of the two systems, respectivelyAQSAnd MBQSRespectively the combined reactive current moments of the two systems.
As a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the relation between the total active current moment and the total reactive current moment and the optimal current active component and reactive component is,
Figure BDA0002468062090000041
as a preferred scheme of the low-loss power distribution ring network open-loop operation site selection method of the invention, the method comprises the following steps: the selection of the optimal opening point further comprises the step of selecting the optimal current active component Δ IPFor positive values, the approximate equilibrium point of the load distribution is set in system B by Δ I starting from the division point of the two systemsPSequentially subtracting the load current of each node along the direction of a power supply point of the system B until the difference is less than 1/2 of the load of the node, wherein the node is the optimal opening point with the minimum network loss of the power distribution network; when the optimal current active component delta IPFor negative values, the approximate equilibrium point of the load distribution in system A is set at the division point of the two systems as the starting point by Δ IPAnd sequentially subtracting the load current of each node along the direction of the power supply point of the system A until the difference is less than 1/2 of the load of the node, wherein the node is the optimal opening point with the minimum network loss of the power distribution network at the moment.
The invention has the beneficial effects that: the method for selecting the site of the open-loop operation of the power distribution ring network with low network loss introduces an ideal flexible interconnection switch in the power distribution network for auxiliary analysis, is convenient for solving an optimal solution, analyzes the relation between the network loss of the power distribution network and the unbalanced degree of load distribution according to the combined current moment, and solves an optimal open-loop operation mode aiming at the minimum network loss of the power distribution network.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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. Wherein:
fig. 1 is a schematic overall flowchart of a method for selecting a site for an open-loop operation of a low-loss distribution ring network according to a first embodiment of the present invention;
fig. 2 is an equivalent circuit of a flexible interconnection switch connected to a distribution ring network according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of load current moment of a node of a power distribution network with a flexible interconnection switch as a partition boundary according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a power distribution ring network structure based on randomly distributed loads in a scenario one experiment according to a first embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, specific embodiments accompanied with figures are described in detail below, and it is apparent that the described embodiments are a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making creative efforts based on the embodiments of the present invention, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
The present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially in general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Meanwhile, in the description of the present invention, it should be noted that the terms "upper, lower, inner and outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation and operate, and thus, cannot be construed as limiting the present invention. Furthermore, the terms first, second, or third are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected and connected" in the present invention are to be understood broadly, unless otherwise explicitly specified or limited, for example: can be fixedly connected, detachably connected or integrally connected; they may be mechanically, electrically, or directly connected, or indirectly connected through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to the schematic diagram of fig. 1, which is a schematic flowchart illustrating a method for selecting a site for an open-loop operation of a power distribution ring network with low network loss according to this embodiment, specifically includes the following steps,
s1: obtaining an equivalent circuit of a power distribution ring network, and dividing a certain branch into two systems by assuming that a flexible interconnection switch is introduced into the branch;
the equivalent circuit can be obtained according to a power distribution ring network circuit topological structure, an ideal flexible interconnection switch is supposed to be introduced into a certain branch of the equivalent circuit to serve as an auxiliary computing element, and the power distribution network is divided into two systems including a system A and a system B by taking the flexible interconnection switch as a division boundary.
S2: assuming that the flexible interconnection switch is in a locked state, acquiring an initial line loss model of the power distribution network;
specifically, the flexible interconnection switch does not take any control measure initially, namely equivalent to the disconnection of a conventional interconnection switch, and at the moment, an initial line loss mathematical expression of the power distribution network can be obtained, wherein the expression of the initial line loss model is,
Figure BDA0002468062090000061
wherein r isAiAnd rBjResistance values, I, of branches I and j in two divided systems, respectivelyAPliAnd IAQliRespectively, the active and reactive components of the I current of the branch, IBPljAnd IBQljRespectively, the active component and the reactive component of the current of branch j.
S3: the method comprises the steps that a PQ control is assumed to be adopted by a flexible interconnection switch to participate in power flow regulation of the power distribution network, and a power distribution network line loss model at the moment is obtained;
the flexible interconnection switch adopts PQ control to participate in power distribution network trend regulation this moment, and through flexible interconnection switch, system A can carry electric current active component and reactive component to system B to the line loss mathematical expression that obtains the power distribution network this moment is:
Figure BDA0002468062090000062
wherein, Delta IPAnd Δ IPThe current active component and the current reactive component output by the flexible interconnection switch are respectively.
Let R∑The total resistance of the main feeder line of the distribution ring network can be expressed as:
Figure BDA0002468062090000063
further, a power distribution network line loss model when the flexible interconnection switch participates in the tidal current regulation is obtained as follows:
Figure BDA0002468062090000064
it can be seen that when the flexible interconnection switch participates in power flow regulation, the bus loss of the power distribution network is a binary quadratic function of the active component and the reactive component of the output current of the flexible interconnection switch, and the function is an elliptic paraboloid with an upward opening.
S4: deriving an expression of the optimal active component and the optimal reactive component output by the flexible interconnection switch when the line loss is minimum according to a line loss model of the power distribution network;
specifically, the deviation of the active component and the reactive component of the current in the line loss mathematical model of the power distribution network is calculated, the active component and the reactive component of the flexible interconnection switch which take the line loss minimum as the target can be obtained, and the active component delta I of the optimal currentPAnd a reactive component Δ IPThe expression of (a) is:
Figure BDA0002468062090000071
Figure BDA0002468062090000072
wherein R is∑The total resistance of a main feeder line of the distribution ring network is shown, and n and m represent the number of two divided system nodes.
S5: obtaining the resistance distance, the active current moment and the reactive current moment of each node in the two divided systems;
wherein, according to the equivalent circuit of the distribution ring network, the resistance distance from each node load of the system A, B to the power supply point of the distribution network is respectively calculated, namely the sum of all branch resistances from the node load to the power supply point of the system can be expressed as,
Figure BDA0002468062090000073
wherein R isAiAnd RBiRespectively the resistance distance r from each node of the two systems to the power supply point of the distribution networkAiAnd rBjThe resistance values of the branches i and j in the two systems are respectively.
And calculating the active current moment and the reactive current moment of each node load in the two systems, wherein the active current moment is expressed as the product of the active component of each node load current in the system A and the system B and the corresponding resistance distance, and the reactive current moment is expressed as the product of the reactive component of each node load current in the system A and the system B and the corresponding resistance distance. Specifically, the calculation formula of the active current moment of each node in the two divided systems is as follows:
Figure BDA0002468062090000074
wherein M isAPiAnd MBPjRespectively the active current moments, I, of nodes I and j in the two systemsAPiAnd IBPjThe active components of the load currents of the nodes i and j in the two systems are respectively.
The reactive current moment calculation formula of each node in the two divided systems is as follows:
Figure BDA0002468062090000081
wherein M isAQiAnd MBQjReactive current moments, I, of nodes I and j in both systemsAQiAnd IBQjThe reactive components of the load current at nodes i and j in the two systems are respectively.
S6: calculating the total active current moment and the total reactive current moment of the two divided systems, and obtaining the relation between the total active current moment and the total reactive current moment and the optimal current active component and reactive component;
specifically, the active current moment and the reactive current moment of the loads of the nodes of the system A and the system B are respectively summed to obtain the combined active current moment and the combined reactive current moment of each system. The calculation formula of the total active current moment and the total reactive current moment is as follows,
Figure BDA0002468062090000082
Figure BDA0002468062090000083
wherein M isAPSAnd MBPSThe resultant active current moments, M, of the two systems, respectivelyAQSAnd MBQSRespectively the combined reactive current moments of the two systems.
Further, the current active increment delta I of the optimal output of the flexible interconnection switchPAnd increment of reactive power Δ IQCan be expressed as a number of times as,
Figure BDA0002468062090000084
Figure BDA0002468062090000085
it can be seen that if the difference between the combined active current moment and the combined reactive current moment of the two systems is smaller, the effect of the flexible interconnection switch participating in the power flow optimization is smaller. In other words, when the load distribution imbalance of the systems on two sides of the interconnection switch is smaller at the beginning of the system, the generated network loss of the power distribution network is smaller. If the total active current moment and the total reactive current moment of the two systems are equal initially, the network loss of the power distribution network reaches the minimum value. Because the optimization of active distribution and reactive distribution cannot be simultaneously met in the open-loop operation mode of the power distribution network, the total active current moment is mainly considered in practical application.
S7: and determining the optimal opening point of the open-loop operation mode of the power distribution network with the minimum network loss as the target according to the optimal current active component.
Specifically, the selection of the optimal opening point further includes the following steps:
when the current active component delta IPFor positive values, the approximate equilibrium point of the load distribution is set in system B by Δ I starting from the division point of the two systemsPSequentially subtracting the node load current along the direction of a power supply point of the system B until the difference is less than 1/2 of the node load, wherein the node is the optimal opening point with the minimum network loss of the power distribution network;
when the current active component delta IPFor negative values, the approximate equilibrium point of the load distribution in system A is set at the division point of the two systems as the starting point by Δ IPAnd sequentially subtracting the node load current along the direction of the power supply point of the system A until the difference is less than 1/2 of the node load, wherein the node is the optimal opening point with the minimum network loss of the power distribution network.
Scene one
In order to verify the practical effect of the low-loss distribution ring network open-loop operation site selection method provided by the embodiment, the following experiments are carried out: let ac system a and ac system B set to 15 and 6 node loads, respectively. The load of each node and the impedance of each branch circuit are randomly generated according to normal distribution, specific parameters are shown in tables 1 and 2, and the network simplified structure is shown in the following figure 4.
TABLE 1 node load parameters based on random load
Figure BDA0002468062090000091
TABLE 2 line impedance of each branch based on random load
Figure BDA0002468062090000092
Figure BDA0002468062090000101
Initially, let the system open at a point between a15 and b 6. At this time, the total active current moment and the total reactive current moment of the system a are 462.9 and 224.3 respectively, the total active current moment and the total reactive current moment of the system B are 42.17 and 21.74 respectively, and the balance point of the total current moments is in the system B. The results obtained by the method of the present example and the results obtained by the genetic algorithm were compared as shown in table 3 below,
TABLE 3 simulation results based on randomly distributed loads
Scheme (Algorithm) Opening point Loss of bus (kW)
Initial state a15-b6 146.355
Gravity open point (invention) a11-a12 65.864
Reselection opening point (genetic algorithm) a11-a12 65.864
It can be seen that the result obtained by the method of the present embodiment is consistent with the simulation result of the genetic algorithm, and the genetic algorithm needs to be updated, iterated and repeatedly calculated, so that a long time is spent in the calculation process.
It should be recognized that embodiments of the present invention can be realized and implemented by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer readable memory. The methods may be implemented in a computer program using standard programming techniques, including a non-transitory computer-readable storage medium configured with the computer program, where the storage medium so configured causes a computer to operate in a specific and predefined manner, according to the methods and figures described in the detailed description. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a computer system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more computer systems configured with executable instructions, and may be implemented as code (e.g., executable instructions, one or more computer programs, or one or more applications) collectively executed on one or more processors, by hardware, or combinations thereof. The computer program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable interface, including but not limited to a personal computer, mini computer, mainframe, workstation, networked or distributed computing environment, separate or integrated computer platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be embodied in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, or the like, such that it may be read by a programmable computer, which when read by the storage medium or device, is operative to configure and operate the computer to perform the procedures described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the computer itself when programmed according to the methods and techniques described herein. A computer program can be applied to input data to perform the functions described herein to transform the input data to generate output data that is stored to non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
As used in this application, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being: a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of example, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between two or more computers. In addition, these components can execute from various computer readable media having various data structures thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from one component interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.

Claims (4)

1. A low-loss power distribution ring network open-loop operation site selection method is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the method comprises the steps that an equivalent circuit of a power distribution ring network is obtained, and the equivalent circuit of the power distribution ring network is divided into two systems by assuming that a flexible interconnection switch is introduced into a certain branch, wherein the systems are a system A and a system B;
assuming that the flexible interconnection switch is in a locked state, acquiring an initial line loss model of the power distribution network;
the method comprises the steps that a flexible interconnection switch is assumed to adopt PQ control to participate in power flow regulation of a power distribution network, and a power distribution network line loss model when the PQ control participates in the power flow regulation is obtained;
obtaining the optimal current active component and reactive component output by the flexible interconnection switch when the line loss is minimum according to a line loss mathematical expression of the power distribution network;
the method specifically comprises the following steps:
obtaining the resistance distance, the active current moment and the reactive current moment of each node in the two divided systems;
the blocking distance of each node in the two divided systems is expressed as,
Figure FDA0003075752670000011
wherein R isAiIs the resistance distance R from the node i to the power supply point of the distribution network in the A systemBjIs the resistance distance r from the node j to the power supply point of the distribution network in the B systemAiIs the resistance value, r, of branch i in the A systemBjThe resistance value of a branch j in the system B;
the calculation formula of the active current moment of each node in the two divided systems is as follows,
Figure FDA0003075752670000012
wherein M isAPiIs the active current moment, M, of node i in the A systemBPjIs the active current moment, I, of node j in the B systemAPiIs the load current active component of node I in the A system, IBPjThe active component of the load current of the node j in the B system is shown;
the reactive current moment calculation formula of each node in the two divided systems is,
Figure FDA0003075752670000013
wherein M isAQiIs the reactive current moment, M, of node i in the A systemBQjIs the reactive current moment, I, of node j in the B systemAQiIs the reactive component of the load current at node I in the A system, IBQjThe reactive component of the load current of the node j in the B system is shown;
respectively calculating a combined active current moment and a combined reactive current moment in the system A and a combined active current moment and a combined reactive current moment in the system B, and obtaining the relation between the combined active current moment and the combined reactive current moment in the system A and the relation between the combined active current moment and the combined reactive current moment in the system B and the optimal current active component and reactive component;
the calculation formulas of the combined active current moment and the combined reactive current moment in the system A and the combined active current moment and the combined reactive current moment in the system B are as follows,
Figure FDA0003075752670000021
Figure FDA0003075752670000022
wherein M isAPSIs the resultant active moment in the A system, MBPSThe resultant active current moment, M, of the B systemAQSIs the resultant reactive current moment, M, in the A systemBQSThe total reactive current moment of the system B;
the relation between the active current moment and the reactive current moment in the system A and the active current moment and the reactive current moment in the system B and the optimal current active component and reactive component is as follows,
Figure FDA0003075752670000023
determining an optimal opening point of an open-loop operation mode of the power distribution network with the aim of minimizing the network loss according to the optimal current active component, comprising,
when the optimal current active component delta IPFor positive values, the approximate equilibrium point of the load distribution is set in system B by Δ I starting from the division point of the two systemsPSequentially subtracting the load current of each node along the direction of a power supply point of the system B until the difference is less than 1/2 of the node load, wherein at the moment, the node is the optimal opening point with the minimum network loss of the power distribution network;
when the optimal current active component delta IPFor negative values, the approximate equilibrium point of the load distribution in system A is set at the division point of the two systems as the starting point by Δ IPAnd sequentially subtracting the load current of each node along the direction of a power supply point of the system A until the difference is less than 1/2 of the node load, wherein at the moment, the node is the optimal opening point with the minimum network loss of the power distribution network.
2. The low-loss power distribution ring network open-loop operation site selection method as recited in claim 1, wherein: the expression of the initial line loss model is,
Figure FDA0003075752670000031
wherein r isAiIs the resistance value, r, of branch i in the A systemBjIs the resistance value of branch j in the B system, IAPliIs the active component of the current of branch I in the A system, IAQliIs the reactive component of the I current of branch in the A system, IBPljIs the active component of the j current of branch B system, IBQljThe reactive component of the current of the branch j in the B system is shown, n is the number of the nodes of the A system, and m represents the number of the nodes of the B system.
3. The low-loss power distribution ring network open-loop operation site selection method as recited in claim 2, wherein: the line loss model of the power distribution network when the flexible interconnection switch participates in the power flow regulation is as follows,
Figure FDA0003075752670000032
Figure FDA0003075752670000033
wherein, Delta IPAnd Δ IQThe active component and the reactive component of the current output by the flexible interconnection switch, R∑The total resistance of a main feeder line of the distribution ring network is shown, n is the number of the nodes of the A system, and m represents the number of the nodes of the B system.
4. The low-loss power distribution ring network open-loop operation site selection method as recited in claim 3, wherein: the optimal current active component and reactive component output by the flexible interconnection switch when the line loss is minimum are respectively,
Figure FDA0003075752670000034
Figure FDA0003075752670000035
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