CN112383059A - Method and device for evaluating reliability of alternating current-direct current hybrid power distribution network - Google Patents
Method and device for evaluating reliability of alternating current-direct current hybrid power distribution network Download PDFInfo
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Abstract
The application discloses a method and a device for evaluating reliability of an alternating current-direct current hybrid power distribution network. Wherein, the method comprises the following steps: acquiring basic data of an alternating current-direct current hybrid power distribution network; analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure; when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures; judging whether the plurality of second radial power grid structures meet constraint conditions; when the second radial power grid structures are determined to meet the constraint conditions, determining a target radial power grid structure meeting preset conditions in the second radial power grid structures; and analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network. The method and the device solve the technical problems that in the related technology, all fault modes of the transformer are used as the factors for measuring the reliability, the occupied weight is too large, the reliability index is not accurate, and a large error exists between the reliability index and the actual reliability.
Description
Technical Field
The application relates to the field of electric power, in particular to an assessment method and device for reliability of an alternating current-direct current hybrid power distribution network.
Background
The reliability of the power distribution network is an important basis for the operation of the power system, if the reliability is low, the stable operation of the power system is greatly influenced, in the related technology, when the reliability is considered, the fault of the transformer is usually counted into a measure index of the reliability, and in most application scenes, the transformer can generally operate stably, namely the fault is not easy to occur, in addition, even if the transformer fails, all fault modes are not suitable to be used as a high weight index for measuring the reliability, because the fault of the general transformer only occurs one or more faults in the fault modes, but not all fault types in the fault modes simultaneously, therefore, the weight of all fault modes of the transformer as the measure factor of the reliability index is overlarge, which is often inconsistent with the actual situation, so the accuracy of the reliability index is influenced, and also brings great interference to the evaluation of the reliability of the power system.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides an assessment method and device for reliability of an alternating current-direct current hybrid power distribution network, and the method and device are used for at least solving the technical problems that in the related technology, all fault modes of a transformer are used as a factor for measuring reliability, the occupied weight is too large, reliability indexes are inaccurate, and a large error exists between the reliability indexes and actual reliability.
According to an aspect of the embodiments of the present application, there is provided a method for evaluating reliability of an ac/dc hybrid power distribution network, including: acquiring basic data of an alternating current-direct current hybrid power distribution network; analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure; when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures; judging whether the plurality of second radial power grid structures meet constraint conditions; when the second radial power grid structures are determined to meet the constraint conditions, determining a target radial power grid structure meeting preset conditions in the second radial power grid structures; and analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
Optionally, the basic data includes: the length of the external power inlet line, the capacity of the load, the power factor of the load, and the length of the feeder section.
Optionally, reconstructing the first radial grid structure comprises: and reconstructing the first radial power grid through a branch exchange method to obtain a second radial power grid structure.
Optionally, satisfying the constraint condition includes: satisfying a first constraint or a second constraint; wherein the first constraint includes at least one of: the network topology structure corresponding to the second radial power grid structure belongs to a set of all feasible radial network topologies; the complex power provided by the power supply point of the second radial power grid structure is greater than the complex power of the load corresponding to the feeder line where the power supply point is located; the load terminal voltage amplitude of the second radial power grid structure is the amplitude of the load voltage corresponding to the power supply feeder; the branch current of the second radial power grid structure is smaller than the maximum value of the branch current; wherein the second constraint condition comprises: the load number of the feeder of the second radial grid structure is less than the maximum load number of the feeder.
Optionally, determining a target radial grid structure satisfying a preset condition in the second radial grid structure includes: judging whether the system load shedding amount corresponding to the second radial power grid structure is the minimum value of the system load shedding amount, wherein the system load shedding amount comprises at least one of the following values: load energy loss amount and load power failure time; and when the system load shedding amount is determined to be the minimum value of the system load shedding amount, determining the second radial grid structure as the target radial grid structure.
Optionally, analyzing the target radial power grid structure, before obtaining the reliability index of the ac/dc hybrid power distribution network, includes: enumerating the fault modes of the transformer in the target radial power grid structure, determining that the transformer has no fault when the number of the enumeration results is zero, and analyzing the target radial power grid structure.
Optionally, the reliability indicator comprises one of: load point index, system index; the load point index is used for measuring the power supply capacity of a single load point, and the load point index comprises the following steps: the average power failure times of the load points in one year, the average duration time of each outage of the load points, and the total power failure time of the load points in one year; the system index is used for measuring the ability of the system to directly supply power to users and distribute power, and the system index comprises the following components: average duration of power outage experienced by each customer during a year, average number of power outages per year, total number of hours of power supplied by the customer per year, and the ratio of hours of power supplied required by the customer.
According to an aspect of the embodiments of the present application, an evaluation apparatus for reliability of an ac/dc hybrid power distribution network is provided, including: the acquisition module is used for acquiring basic data of the alternating current-direct current hybrid power distribution network; the first analysis module is used for analyzing the basic data through a depth-first algorithm and determining a first radial distribution network structure; the reconstruction module is used for reconstructing the first radial power grid structure when the transformer fails to work to obtain a plurality of second radial power grid structures; the judging module is used for judging whether the plurality of second radial power grid structures meet constraint conditions or not; the determining module is used for determining a target radial power grid structure meeting preset conditions in the plurality of second radial power grid structures after determining that the plurality of second radial power grid structures meet constraint conditions; and the second analysis module is used for analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
According to another aspect of the embodiment of the application, a nonvolatile storage medium is further provided, and the nonvolatile storage medium includes a stored program, wherein when the program runs, a device where the nonvolatile storage medium is located is controlled to execute any one evaluation method for reliability of the alternating current/direct current hybrid power distribution network.
According to another aspect of the embodiments of the present application, there is also provided a processor, where the processor is configured to execute a program stored in a memory, where the program executes any one of the methods for evaluating reliability of the ac/dc hybrid power distribution network.
In the embodiment of the application, a depth-first algorithm is adopted for searching, the first radial distribution is determined by the depth-first algorithm through obtaining basic data, the power grid structure is reconstructed when the transformer fails, and the reconstructed power grid structure is analyzed to obtain the reliability index, so that the purpose of eliminating the excessive interference of the transformer failure on the reliability index is achieved, the reliability of the power system is more accurately evaluated, the technical effect of reducing the error with the actual reliability is achieved, and the technical problems that the reliability index is inaccurate and the error with the actual reliability is large due to the fact that all failure modes of the transformer are used as the factors for measuring the reliability in the related technology and the occupied weight is too large are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1 is a schematic flow chart of an evaluation method for reliability of an ac/dc hybrid power distribution network according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an evaluation device for reliability of an ac/dc hybrid power distribution network according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
For better understanding of the embodiments of the present application, technical terms or partial terms related to the embodiments of the present application will be explained as follows:
the electric power GIS is a production management integrated information system which connects electric power equipment, transformer substations, power transmission and distribution networks, power consumers, electric power loads and the like of electric power enterprises to form electric power informatization. The provided power equipment information, power grid running state information, power technology information, production management information, power market information, mountains, terrains, towns, roads, natural environment information such as weather, hydrology, geology, resources and the like are centralized in a unified system. Related data, pictures, images, maps, technical data, management knowledge and the like can be inquired through the GIS.
The Power Management System (Power Management System, PMS for short) has the following functions: monitoring the state of a power switch in a plant area, monitoring the electric quantity, the three-phase voltage, the three-phase current, the frequency, the power factor and the like. When the power system in the factory area is abnormal, and the electric quantity is insufficient or excessive, the functions of automatic unloading (Load unloading) or Dynamic braking (Dynamic braking) and the like can be quickly performed in response, so that the occurrence of blackness in the factory area is prevented, and the stability and the quality of the power system in the whole factory area can be improved.
According to an embodiment of the present application, there is provided an embodiment of a method for evaluating reliability of an ac/dc hybrid power distribution network, where the steps illustrated in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that shown.
Fig. 1 is a method for evaluating reliability of an ac/dc hybrid power distribution network according to an embodiment of the present application, and as shown in fig. 1, the method includes the following steps:
step S102, acquiring basic data of the alternating current-direct current hybrid power distribution network;
step S104, analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure;
s106, when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures;
step S108, judging whether the plurality of second radial power grid structures meet constraint conditions;
step S110, after determining that the plurality of second radial power grid structures meet constraint conditions, determining a target radial power grid structure meeting preset conditions in the plurality of second radial power grid structures;
and S112, analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
In the method, firstly, basic data of an alternating current-direct current hybrid power distribution network can be acquired; then analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure; when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures; judging whether the second radial power grid structures meet constraint conditions or not; when the second radial power grid structures are determined to meet the constraint conditions, determining target radial power grid structures meeting preset conditions in the second radial power grid structures; finally, the target radial power grid structure is analyzed to obtain the reliability index of the alternating current-direct current hybrid power distribution network, and the purpose of eliminating the overlarge interference of the fault of the transformer on the reliability index is achieved, so that the reliability of the power system is more accurately evaluated, the technical effect of reducing the error with the actual reliability is achieved, and the technical problems that the reliability index is inaccurate and the error with the actual reliability is large due to the fact that all fault modes of the transformer are used as the reliability measuring factor in the related technology and account for overlarge weight are solved.
The first radial grid structure is that no tie line is established between an ac line and a dc line, the ac bus is led out of the dc bus via the inverter, and the dc bus is connected to the dc power supply, the dc load and the energy storage device.
It should be noted that the basic data includes, but is not limited to: the method comprises the steps that basic data of an alternating current-direct current hybrid power distribution network are obtained according to the length of an external power incoming line, the capacity of a load, the power factor of the load and the length of a feeder line section, and the basic data include but are not limited to the electrical data automatically collected from a power utilization information collecting system, a marketing business application system, a power Geographic Information System (GIS) and a Power Management System (PMS) of a power company.
Before the basic data are analyzed by an over-depth-first algorithm and the first radial distribution network structure is determined, the basic data need to be processed, the processing process is to use the length of an external power incoming line, the capacity of a load, the power factor of the load and the length of a feeder line segment as nodes of a tree, construct a tree (tree graph), traverse the tree stub graph by the depth-first algorithm, when all the nodes of the tree are searched, the tree stub graph returns to a starting node, if nodes which are not found exist, one node is selected as a source node, and the traversing process is repeated.
In some optional embodiments of the present application, the first radial grid may be reconstructed by a branch exchange method to obtain a second radial grid structure.
In some optional embodiments of the present application, the constraint conditions are satisfied: satisfying a first constraint or a second constraint; wherein the first constraint includes but is not limited to: the network topology structure corresponding to the second radial power grid structure belongs to a set of all feasible radial network topologies, the complex power provided by the power supply point of the second radial power grid structure is greater than the complex power of the load corresponding to the feeder line where the power supply point is located, the load end voltage amplitude of the second radial power grid structure is the amplitude of the voltage of the load corresponding to the power supply feeder line, and the branch current of the second radial power grid structure is less than the maximum value of the branch current; wherein the second constraint includes but is not limited to: the load number of the feeder of the second radial grid structure is less than the maximum load number of the feeder.
In some embodiments of the present application, the first constraint condition may be represented by the following function, and specifically, the set of all feasible radial network topologies of the network topology corresponding to the second radial grid structure may be represented by the following function:
gke G, wherein GkIs a reconstructed network topology; g is the set of all possible radial network topologies.
The complex power provided by the power point of the second radial grid structure, which is greater than the complex power of the corresponding load of the feeder on which the power point is located, can be expressed as a function of:
The load terminal voltage amplitude of the second radial grid structure is the amplitude of the load voltage corresponding to the power supply feeder, and the maximum value of the branch current of the second radial grid structure which is smaller than the branch current can be expressed by a function:
The second constraint may be represented by the following function:
Nk,l≤Nkwherein N isk,lThe load number of the feeder line k; n is a radical ofkIs the maximum energy band load number of the feeder k.
It should be noted that for an open-loop radial distribution network, the longer the feeder, the lower the load terminal voltage at the end of the feeder, and may not meet the operational constraints. Therefore, the distribution network is reconstructed, active power provided by the multi-end flexible direct current device is firstly increased, and the multi-end flexible direct current device of the original feeder line of the fault transformer supplies power to a load. When the power provided by the multi-end flexible direct current device is insufficient, the load is transferred to the adjacent feeder line through the closed feeder line tail end connection switch, the constraint condition check is carried out after the load transfer is finished, if the constraint condition is not met, the output power of the multi-end flexible direct current device is increased again, the constraint condition is checked until all the feeder lines meet the constraint condition, and the distribution network reconfiguration is completed at one time. And calculating the load loss of the system by adopting a fault mode analysis method for the reconstructed power distribution network system, and recording.
In some optional embodiments of the present application, it may be determined whether the second radial grid structure is a target radial grid structure meeting a preset condition, specifically, by: judging whether the system load shedding amount corresponding to the second radial power grid structure is the minimum value of the system load shedding amount, wherein the system load shedding amount comprises at least one of the following values: load energy loss amount and load power failure time; and when the system load shedding amount is determined to be the minimum value of the system load shedding amount, determining the second radial grid structure as the target radial grid structure.
In some optional embodiments of the present application, the target radial grid structure is analyzed, and before the reliability index of the ac/dc hybrid power distribution network is obtained, the fault of the transformer is eliminated in the following manner: enumerating the fault modes of the transformer in the target radial power grid structure, determining that the transformer has no fault when the number of the enumeration results is zero, and analyzing the target radial power grid structure, wherein the fault modes include but are not limited to: the transformer body or its accessory breaks down, and specifically, the body breaks down and includes: 1. winding: insulation anomaly, short circuit fault, deformation; 2. iron core: multipoint grounding, insulation reduction, iron core deformation and poor grounding; 3. a body: oil leakage, poor welding process and foreign matters inside. Accessory failures include: 1. sleeving a sleeve: insulation and moisture, porcelain bushing flashover, aging, discharging, breakdown and the like; 2. a tap switch: linkage, movement refusal, exceeding of limit position, bad contact of moving and static contacts, oil leakage, discharge and the like; 3. the protection system comprises: oil leakage, secondary insulation abnormality and inaccurate indication; 4. a cooling system: leakage oil, blocked oil flow circuit, abnormal operation, etc. It is easy to note that, the above failure modes are enumerated, and in order to eliminate all the above failure modes, when any one of the above failure modes does not exist, it is determined that the transformer has no failure.
The reliability index includes one of the following: load point index, system index; the load point index is used for measuring the power supply capacity of a single load point, and the load point index includes but is not limited to: the average power failure times of the load points in one year, the average duration time of each outage of the load points, and the total power failure time of the load points in one year; system metrics are used to measure the ability of the system to supply and distribute power directly to users, and include, but are not limited to: average duration of power outage experienced by each customer during a year, average number of power outages per year, total number of hours of power supplied by the customer per year, and the ratio of hours of power supplied required by the customer.
Specifically, the method comprises the following steps: the average power failure times in one year of the load point can be determined by the load point outage rate lambdaiDenotes λiThe calculation formula of (2) is as follows:
wherein n isiFor counting the power failure times of a load point i in a time range, NyearFor counting years, TdiAnd TuiThe total power failure time and the normal operation time of the load point i in the statistical time are respectively, and the unit is hour.
The average duration of each outage of a load point may be the load point failover time ri，riThe calculation formula of (2) is as follows:
wherein n isiIndicating the number of power failures.
The total outage time of a load point in a year may be according to the formula:
The average duration of the outage experienced by each user over the year may be according to the formula:
The average power failure times of a user in a unit of one year can be calculated according to the following formula:
The ratio of the total number of user power hours per year to the number of power hours required by the user can be calculated according to the following formula:
Fig. 2 is an apparatus for evaluating reliability of an ac/dc hybrid power distribution network according to an embodiment of the present application, as shown in fig. 2, the apparatus includes:
the acquisition module 40 is used for acquiring basic data of the alternating current-direct current hybrid power distribution network;
a first analysis module 42, configured to analyze the basic data through a depth-first algorithm to determine a first radial power distribution network structure;
the reconstruction module 44 is configured to reconstruct the first radial grid structure when the transformer fails to operate, so as to obtain a plurality of second radial grid structures;
a judging module 46, configured to judge whether the plurality of second radial grid structures meet a constraint condition;
the determining module 48 is configured to determine, when it is determined that the plurality of second radial grid structures meet the constraint condition, a target radial grid structure meeting a preset condition in the plurality of second radial grid structures;
and the second analysis module 50 is used for analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
In the device, an acquisition module 40 is used for acquiring basic data of an alternating current-direct current hybrid power distribution network; a first analysis module 42, configured to analyze the basic data through a depth-first algorithm to determine a first radial power distribution network structure; the reconstruction module 44 is configured to reconstruct the first radial grid structure when the transformer fails to operate, so as to obtain a plurality of second radial grid structures; a judging module 46, configured to judge whether the plurality of second radial grid structures meet a constraint condition; the determining module 48 is configured to determine, when it is determined that the plurality of second radial grid structures meet the constraint condition, a target radial grid structure meeting a preset condition in the plurality of second radial grid structures; the second analysis module 50 is configured to analyze the target radial grid structure to obtain a reliability index of the ac/dc hybrid power distribution network, so as to achieve the purpose of eliminating excessive interference of a fault of the transformer on the reliability index, thereby achieving a technical effect of more accurately evaluating the reliability of the power system and reducing an error with actual reliability, and further solving technical problems of inaccurate reliability index and a large error with actual reliability caused by an excessive weight due to all fault modes of the transformer serving as a factor for measuring reliability in the related art.
It should be noted that the basic data includes, but is not limited to: the method comprises the steps that basic data of an alternating current-direct current hybrid power distribution network are obtained according to the length of an external power incoming line, the capacity of a load, the power factor of the load and the length of a feeder line section, and the basic data include but are not limited to the electrical data automatically collected from a power utilization information collecting system, a marketing business application system, a power Geographic Information System (GIS) and a Power Management System (PMS) of a power company.
According to another aspect of the embodiment of the application, a nonvolatile storage medium is further provided, and the nonvolatile storage medium includes a stored program, wherein when the program runs, a device where the nonvolatile storage medium is located is controlled to execute any one evaluation method for reliability of the alternating current/direct current hybrid power distribution network.
Specifically, the storage medium is used for storing program instructions for executing the following functions, and the following functions are realized:
acquiring basic data of an alternating current-direct current hybrid power distribution network; analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure; when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures; judging whether the plurality of second radial power grid structures meet constraint conditions; when the second radial power grid structures are determined to meet the constraint conditions, determining a target radial power grid structure meeting preset conditions in the second radial power grid structures; and analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
According to another aspect of the embodiments of the present application, there is also provided a processor, where the processor is configured to execute a program stored in a memory, where the program executes any one of the methods for evaluating reliability of the ac/dc hybrid power distribution network.
Specifically, the processor is configured to call a program instruction in the memory, and implement the following functions:
acquiring basic data of an alternating current-direct current hybrid power distribution network; analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure; when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures; judging whether the plurality of second radial power grid structures meet constraint conditions; when the second radial power grid structures are determined to meet the constraint conditions, determining a target radial power grid structure meeting preset conditions in the second radial power grid structures; and analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present application, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The 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 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 application 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 unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.
Claims (10)
1. An assessment method for reliability of an alternating current-direct current hybrid power distribution network is characterized by comprising the following steps:
acquiring basic data of an alternating current-direct current hybrid power distribution network;
analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure;
when the transformer fails, reconstructing the first radial power grid structure to obtain a plurality of second radial power grid structures;
judging whether the plurality of second radial power grid structures meet constraint conditions;
when the second radial power grid structures are determined to meet constraint conditions, determining a target radial power grid structure meeting preset conditions in the second radial power grid structures;
and analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
2. The method of claim 1, wherein the base data comprises: the length of the external power inlet line, the capacity of the load, the power factor of the load, and the length of the feeder section.
3. The method of claim 1, wherein reconstructing the first radial grid structure comprises:
and reconstructing the first radial power grid through a branch exchange method to obtain the second radial power grid structure.
4. The method of claim 1, wherein satisfying the constraint comprises: satisfying a first constraint or a second constraint;
wherein the first constraint includes at least one of: the network topology structure corresponding to the second radial grid structure belongs to a set of all feasible radial network topologies; the complex power provided by the power supply point of the second radial power grid structure is greater than the complex power of the load corresponding to the feeder line where the power supply point is located; the load end voltage amplitude of the second radial power grid structure is the amplitude of the load voltage corresponding to the power supply feeder line; the branch current of the second radial power grid structure is smaller than the maximum value of the branch current;
wherein the second constraint condition comprises: and the load number of the feeder line of the second radial power grid structure is less than the maximum load number of the feeder line.
5. The method of claim 1, wherein determining a target radial grid structure of the second radial grid structures that meets a preset condition comprises:
judging whether a system load shedding amount corresponding to the second radial power grid structure is the minimum value of the system load shedding amount, wherein the system load shedding amount comprises at least one of the following values: load energy loss amount and load power failure time;
and when the system load shedding amount is determined to be the minimum value of the system load shedding amount, determining the second radial power grid structure as a target radial power grid structure.
6. The method according to claim 1, wherein before analyzing the target radial grid structure to obtain the reliability index of the ac/dc hybrid power distribution network, the method comprises:
enumerating failure modes of the transformer in the target radial grid structure,
and when the number of the enumeration results is zero, determining that the transformer has no fault, and analyzing the target radial power grid structure.
7. The method of claim 1, wherein the reliability indicator comprises one of: load point index, system index;
the load point index is used for measuring the power supply capacity of a single load point, and the load point index comprises the following steps: the average power failure times of the load points in one year, the average duration time of each outage of the load points, and the total power failure time of the load points in one year;
the system index is used for measuring the ability of the system to directly supply power to users and distribute power, and the system index comprises: average duration of power outage experienced by each customer during a year, average number of power outages per year, total number of hours of power supplied by the customer per year, and the ratio of hours of power supplied required by the customer.
8. The utility model provides an evaluation device of alternating current-direct current series-parallel connection distribution network reliability which characterized in that includes:
the acquisition module is used for acquiring basic data of the alternating current-direct current hybrid power distribution network;
the first analysis module is used for analyzing the basic data through a depth-first algorithm to determine a first radial distribution network structure;
the reconstruction module is used for reconstructing the first radial power grid structure when the transformer fails to work to obtain a plurality of second radial power grid structures;
the judging module is used for judging whether the plurality of second radial power grid structures meet constraint conditions or not;
the determining module is used for determining a target radial grid structure meeting preset conditions in the plurality of second radial grid structures after determining that the plurality of second radial grid structures meet constraint conditions;
and the second analysis module is used for analyzing the target radial power grid structure to obtain the reliability index of the alternating current-direct current hybrid power distribution network.
9. A non-volatile storage medium, characterized in that the non-volatile storage medium comprises a stored program, wherein when the program runs, a device where the non-volatile storage medium is located is controlled to execute the method for evaluating the reliability of the ac/dc hybrid power distribution network according to any one of claims 1 to 7.
10. A processor, characterized in that the processor is configured to run a program stored in a memory, wherein the program is configured to execute the method for assessing the reliability of an ac/dc hybrid power distribution network according to any one of claims 1 to 7 when running.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180240202A1 (en) * | 2015-08-19 | 2018-08-23 | China Electric Power Research Institute Company Limited | Method of predicting distribution network operation reliability |
| CN110276532A (en) * | 2019-06-04 | 2019-09-24 | 国网江苏省电力有限公司泰州供电分公司 | A kind of distribution network reliability calculation method of the research based on load piecemeal |
| CN110707690A (en) * | 2019-09-30 | 2020-01-17 | 国网北京市电力公司 | Power distribution network reliability assessment method and device |
-
2020
- 2020-11-27 CN CN202011360507.XA patent/CN112383059A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180240202A1 (en) * | 2015-08-19 | 2018-08-23 | China Electric Power Research Institute Company Limited | Method of predicting distribution network operation reliability |
| CN110276532A (en) * | 2019-06-04 | 2019-09-24 | 国网江苏省电力有限公司泰州供电分公司 | A kind of distribution network reliability calculation method of the research based on load piecemeal |
| CN110707690A (en) * | 2019-09-30 | 2020-01-17 | 国网北京市电力公司 | Power distribution network reliability assessment method and device |
Non-Patent Citations (2)
| Title |
|---|
| 刘沛立等: "基于图论的故障影响遍历的配电网可靠性评估方法", 《低压电器》 * |
| 李志民等: "辐射状配电系统可靠性评估的故障遍历算法", 《电力系统自动化》 * |
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