CN110707690A - Power distribution network reliability assessment method and device - Google Patents
Power distribution network reliability assessment method and device Download PDFInfo
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Abstract
The application discloses a method and a device for evaluating reliability of a power distribution network. The method comprises the following steps: a determining step, namely determining that a preset load upper-level power supply fails; adjusting, namely reconstructing a distribution network by using a flexible interconnection function of an energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent; calculating the system load loss amount under the new distribution network structure; repeating the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network structure as a distribution network reconstruction scheme under the condition that a superior power supply fails; the adjusting step and the calculating step are repeatedly executed for each superior power supply, and a power distribution network reconstruction scheme of each superior power supply under the condition of failure is obtained; and calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes. The technical problem of a power distribution network reliability evaluation method without adaptation of a power distribution network with an energy information interaction center in the related technology is solved.
Description
Technical Field
The application relates to the field of power supply of a power distribution network, in particular to a method and a device for evaluating reliability of the power distribution network.
Background
The alternating current-direct current hybrid power distribution network breaks through the inherent structural limitation of the existing alternating current distribution network feeder line interconnection through flexible direct current interconnection, has the advantages of improving the inter-regional tidal current mutual supply capacity of the power distribution network, improving the power supply reliability and the electric energy quality, better accepting a distributed power supply and a direct current load, providing dynamic reactive power support in a load center and the like, meets the new requirements of power distribution network development, and is an important development trend of the power distribution network. The alternating current-direct current hybrid power distribution network based on the energy information interaction center has excellent performance and wide application space.
The energy information interaction center mainly plays the roles of voltage grade conversion, direct current interaction, alternating current and direct current hybrid connection and the like in the power distribution network, has multiple working modes and has multiple energy flows. The traditional method for evaluating the reliability of the power distribution network cannot be directly applied to the power distribution network containing the energy information interaction center because flexible switching of multiple working modes is not involved. The reliability evaluation method of the power distribution network containing the energy information interaction center is further designed based on the characteristics of the energy information interaction center from the operation mode of the alternating-current and direct-current hybrid power distribution network and the mutual influence relationship of the alternating-current and direct-current hybrid power distribution network.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The application provides a method and a device for evaluating reliability of a power distribution network, which are used for solving the technical problem of an unadapted method for evaluating reliability of the power distribution network containing an energy information interaction center in the related technology.
According to one aspect of the application, a power distribution network reliability assessment method is provided. The method comprises the following steps: a determining step, namely determining that a preset load upper-level power supply fails; adjusting, namely reconstructing a distribution network by using a flexible interconnection function of an energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between a high-voltage alternating-current power distribution network and a low-voltage alternating-current power distribution network and is provided with a plurality of direct-current ports, so that plug-and-play of a direct-current load and a direct-current power supply can be realized, direct-current interconnection is realized, and switching between closed-loop operation and open-loop operation of the distribution network is performed; calculating the system load loss amount under the new distribution network structure; repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network structure as a distribution network reconstruction scheme under the condition that the superior power supply fails; the adjusting step and the calculating step are repeatedly executed for each superior power supply, and a power distribution network reconstruction scheme of each superior power supply under the condition of failure is obtained; and calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes.
Optionally, the method further includes: calculating the reliability of recovering the load power supply by using the energy information interaction center; calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
Optionally, calculating the reliability of recovering the load power supply by using the energy information interaction center includes: determining that a superior power grid of the energy information interaction center fails; judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity; under the condition of failure in discharging or insufficient capacity, judging whether the energy can be transferred to other energy information interaction centers; the energy storage system supplies power to the load so as to reduce the load loss of the system to the maximum extent; recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered; and calculating the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
Optionally, the method further includes: calculating the reliability of the energy information interaction center; calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
Optionally, calculating the reliability of the energy information interaction center itself includes: dividing the energy information interaction center into a preset number of subsystems; and respectively calculating the reliability of each subsystem, and calculating the reliability of the energy information interaction center according to the reliability of each subsystem.
According to another aspect of the application, a power distribution network reliability evaluation device is provided. The device includes: the determining unit is used for determining that the upper-level power supply of the preset load has a fault; the adjusting unit is used for reconstructing a distribution network by utilizing the flexible interconnection function of the energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between the high-voltage alternating-current distribution network and the low-voltage alternating-current distribution network and is provided with a plurality of direct current ports, so that the plug-and-play of a direct current load and a direct current power supply can be realized, the direct current interconnection is realized, and the switching between closed-loop operation and open-loop operation of the distribution network is performed; the first calculation unit is used for calculating the system load loss under the new distribution network structure; the execution unit is used for repeatedly executing the adjustment unit and the first calculation unit to obtain a new distribution network structure with the minimum system load loss amount, and the new distribution network structure is used as a distribution network reconstruction scheme under the condition that the superior power supply fails; the acquisition unit is used for repeatedly executing the adjustment unit and the first calculation unit on each superior power supply to obtain a power distribution network reconstruction scheme of each superior power supply under the condition of failure; and the second calculation unit is used for calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network.
Optionally, the apparatus further comprises: the first calculating subunit is used for calculating the reliability of recovering the load power supply by using the energy information interaction center; the second calculation unit includes: and the second calculating subunit calculates the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
Optionally, the first calculating subunit includes: the determining module is used for determining that the superior power grid of the energy information interaction center is in fault; the first judgment module is used for judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity; the second judgment module is used for judging whether the energy can be supplied to other energy information interaction centers or not under the condition of failure in discharging or insufficient capacity; the power supply module is used for supplying power to the load by the energy storage system so as to reduce the load loss of the system to the maximum extent; the recovery module is used for recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered; and the computing module is used for computing the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
Optionally, the apparatus further comprises: the third calculating unit is used for calculating the reliability of the energy information interaction center; a second computing unit comprising: and the third computing subunit is used for computing the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
Optionally, the third computing unit includes: the dividing subunit is used for dividing the energy information interaction center into a preset number of subsystems; and the fourth calculating subunit is used for calculating the reliability of each subsystem respectively and calculating the reliability of the energy information interaction center according to the reliability of each subsystem.
According to another aspect of the present application, there is provided a storage medium including a stored program, wherein the program executes the power distribution network reliability evaluation method according to any one of the above.
According to another aspect of the present application, a processor for executing a program is provided, where the program executes to perform the power distribution network reliability assessment method described in any one of the above.
By the present application: a determining step, namely determining that a main transformer on a preset line has a fault; adjusting, namely reconstructing a distribution network to form a new distribution network structure, and adjusting an energy information interaction center to recover load power supply, wherein the energy information interaction center is connected between a high-voltage alternating-current distribution network and a low-voltage alternating-current distribution network and is used for realizing plug-and-play of a direct-current load and a direct-current power supply, and performing direct-current interconnection with the layer of the high-voltage distribution network to switch closed-loop operation and open-loop operation of the distribution network; calculating the system load loss amount under the new distribution network structure; repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network result as a distribution network reconstruction scheme under the condition that the main transformer fails; the adjusting step and the calculating step are repeatedly executed for each main transformer, and a power distribution network reconstruction scheme of each main transformer under the condition of failure is obtained; the reliability of the power distribution network is calculated at least according to all the obtained power distribution network reconstruction schemes, the technical problem that in the related technology, a traditional power distribution network reliability evaluation method cannot be directly applied to the power distribution network containing an energy information interaction center due to the fact that flexible switching of multiple working modes is not involved, and therefore the power distribution network containing the energy information interaction center is not suitable for the power distribution network reliability evaluation method is solved, and the technical effect of carrying out reliability evaluation on the power distribution network containing the energy information interaction center is achieved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic diagram of an alternative AC/DC hybrid power distribution network structure based on an energy information interaction center;
fig. 2 is a flowchart of a method for evaluating reliability of a power distribution network according to an embodiment of the present application;
fig. 3 is a flowchart of an alternative power distribution network reliability evaluation method according to an embodiment of the present application;
FIG. 4 is a flow chart of another alternative power distribution network reliability assessment method provided in accordance with an embodiment of the present application;
fig. 5 is a schematic diagram of a power distribution network reliability evaluation device provided according to an embodiment of the present application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
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 should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. 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.
It should be noted that: the energy information interaction center takes flexible power electronic devices such as power electronic transformers, energy storage systems and the like as carriers, realizes interconnection of different partitions of a power grid, provides uniform physical and communication interfaces, and realizes interaction of energy flow and information flow. The energy information interaction center mainly plays the roles of voltage grade conversion, direct current interaction, alternating current and direct current hybrid connection and the like in the power distribution network, has multiple working modes and has multiple energy flows. Fig. 1 shows a schematic structure of an alternating current-direct current hybrid power distribution network based on an energy information interaction center.
Based on the power distribution network system equipped with the energy information interaction center, the embodiment of the application provides a power distribution network reliability evaluation method.
Fig. 2 is a flowchart of a method for evaluating reliability of a power distribution network according to an embodiment of the present application. As shown in fig. 2, the method comprises the steps of:
step S101, a determining step, wherein the upper level power supply of the preset load is determined to be in fault;
and S102, adjusting, namely reconstructing a distribution network by utilizing the flexible interconnection function of an energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between a high-voltage alternating-current distribution network and a low-voltage alternating-current distribution network and is provided with a plurality of direct current ports, so that plug and play of a direct current load and a direct current power supply can be realized, direct current interconnection is realized, and switching between closed-loop operation and open-loop operation of the distribution network is performed.
It should be noted that: and (4) carrying out distribution network reconstruction, firstly increasing active power provided by an energy information interaction center, and supplying power to a load by the energy information interaction center of the original feeder line of the fault power supply. When the power provided by the feeder line energy information interaction center is insufficient, the load is transferred to other adjacent feeder lines by controlling the energy information interaction center or closing the interconnection switch.
In an optional example, after the adjusting step is performed, the method for evaluating reliability of a power distribution network further includes: judging whether the new distribution network structure meets constraint conditions (voltage constraint, power constraint and the like); under the condition that the distribution network structure does not meet the constraint condition, continuing to execute the adjustment step to reconstruct the distribution network; and under the condition that the distribution network structure meets the constraint condition, continuing to execute the calculation step.
For example, in the case that the distribution network structure does not satisfy the constraint condition, the continuing to perform the adjusting step includes: and increasing active power provided by other adjacent feeder line energy information interaction centers until all feeder lines meet the constraint condition.
And if the energy information interaction center is increased to the maximum output power and the constraint condition of the distribution network structure can not be met, reconstructing the distribution network again to form a new distribution network structure.
Wherein the constraint conditions are specifically as follows:
and (3) network topology constraint: gkE G, wherein GkFor the reconstructed network topology, G is the set of all feasible radial network topologies.
And (3) power constraint:
wherein S iskComplex power that can be provided for the power supply point; sl,iComplex power of the ith load of the feeder line where the power supply point is located; and C is a load set of the feeder line where the power supply point is located.
Load terminal voltage constraint and branch current constraint:
wherein, Ui min、Ui maxVoltage amplitude U for ith load on power supply feeder lineiUpper and lower limit values of (d); i isk maxCurrent amplitude I for branch kkIs measured.
Wherein the constraints can be integrated into Nk,l≤NkConstraint condition of wherein Nk,lThe load number of the feeder line k; n is a radical ofkIs the maximum energy band load number of the feeder k.
Wherein, the target function of the distribution network reconstruction is the load power loss LdlossMinimum, i.e., min Ldloss。
And step S103, calculating the system load loss under the new distribution network structure.
In an optional example, after the calculating step is performed, the method for evaluating reliability of a power distribution network further includes: establishing a new association relationship between a distribution network structure and the system load loss amount, and performing storage processing, wherein the storage content comprises: the new distribution network structure, the system load loss amount and the incidence relation between the new distribution network structure and the system load loss amount. So that in the subsequent step, the more preferable distribution network structure in the plurality of distribution network structures is judged according to the stored content.
And S104, repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system loss load, and taking the new distribution network structure as a distribution network reconstruction scheme under the condition that the superior power supply fails.
It should be noted that: the repeatedly executing the adjusting step and the calculating step comprises the following steps: and under the condition that the determined upper-level power supply of the preset load with the fault is not changed, replacing the formed new distribution network structure in the adjusting step. For example, if the previous adjustment step is to close the contact switch a, the current adjustment step is to close the contact switch b.
Step S105, repeatedly executing the adjusting step and the calculating step for each superior power supply to obtain a power distribution network reconstruction scheme of each superior power supply under the condition of failure;
it should be noted that: the power distribution network is provided with a plurality of superior power supplies, other superior power supplies are sequentially assumed to have faults at the moment, and the adjusting step and the calculating step are sequentially and repeatedly executed, so that the power distribution network reconstruction scheme under the condition that each superior power supply has the faults is obtained.
And S106, calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes.
Specifically, load loss analysis is performed at least according to the system load loss under each distribution network structure included in all the obtained distribution network reconstruction methods, so as to obtain the reliability index of the distribution network.
According to the reliability evaluation method for the power distribution network, the main transformer on the preset line is determined to have a fault through the determination step; adjusting, namely reconstructing a distribution network to form a new distribution network structure, and adjusting an energy information interaction center to recover load power supply, wherein the energy information interaction center is connected between a high-voltage alternating-current distribution network and a low-voltage alternating-current distribution network and is used for realizing plug-and-play of a direct-current load and a direct-current power supply, and performing direct-current interconnection with the layer of the high-voltage distribution network to switch closed-loop operation and open-loop operation of the distribution network; calculating the system load loss amount under the new distribution network structure; repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network result as a distribution network reconstruction scheme under the condition that the main transformer fails; the adjusting step and the calculating step are repeatedly executed for each main transformer, and a power distribution network reconstruction scheme of each main transformer under the condition of failure is obtained; the reliability of the power distribution network is calculated at least according to all the obtained power distribution network reconstruction schemes, the technical problem that in the related technology, a traditional power distribution network reliability evaluation method cannot be directly applied to the power distribution network containing the energy information interaction center due to the fact that flexible switching of multiple working modes is not involved is solved, and therefore the power distribution network containing the energy information interaction center is not suitable for the power distribution network reliability evaluation method, and the technical effect of carrying out reliability evaluation on the power distribution network containing the energy information interaction center is achieved.
It should be noted that: according to the reliability evaluation method for the power distribution network, firstly, a ring and spoke network decoupling algorithm is utilized to decompose a power grid into a ring network and a radiation network; then, reliability evaluation is carried out on the radiation network, and injection power correction is carried out on a radiation network grid-connected point (looped network) by utilizing the evaluation result of the radiation network; and finally, utilizing a power generation and transmission system reliability evaluation method to evaluate the reliability of the looped network.
In addition, the power distribution network reliability evaluation method also considers the relevant influence on power distribution network reliability evaluation after the energy information interaction center is accessed, and the above contents are not realized in the prior art.
For example, the following steps are carried out: for radial alternating current-direct current hybrid power distribution networks, the evaluation flow of the power distribution network reliability evaluation method provided by the application can be as shown in fig. 3, namely:
step 1: after the basic data is input, the initialization structure of the radial distribution network is analyzed through a depth-first search algorithm.
Step 2: assuming that the main transformers of 1 line have faults, the distribution network reconstruction is realized by closing the interconnection switches and adjusting the active power of the energy information interaction center.
The distribution network reconfiguration mode is a branch exchange method, namely, when a contact switch is closed to form a loop, a section switch on the loop is opened so as to always keep a radial structure of the distribution network; preferentially adjusting the output power of the energy information interaction center to recover the load power supply; and preferentially selecting a power distribution network reconstruction scheme with less increase of the length of the feeder line carried by the transformer.
And step 3: and (4) performing safety check and judging whether the power distribution network reconstruction scheme meets the constraint condition every time a power distribution network structure is formed, if not, going to the step 2 to perform power distribution network reconstruction again, and if so, going to the step 4.
And 4, step 4: and for the power distribution network reconstruction scheme meeting the constraint conditions, calculating the system load loss amount and recording the distribution network structure and the system load loss amount of the scheme.
And 5: and when all the switch exchange items are executed, comparing the system loss load quantities of the obtained power distribution network reconstruction scheme, and selecting the scheme with the minimum system loss load quantity as the power distribution network reconstruction scheme under the condition of the transformer failure.
Step 6: and when all the transformer fault modes are listed, the reliability index of the alternating current-direct current hybrid power distribution network can be obtained through calculation after load loss analysis is carried out.
Optionally, in the power distribution network reliability assessment method provided in the embodiment of the present application, the method further includes: calculating the reliability of recovering the load power supply by using the energy information interaction center; calculating the reliability according to at least all the obtained power distribution network reconstruction schemes includes: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
Optionally, in the power distribution network reliability assessment method provided in the embodiment of the present application, the method further includes: calculating the reliability of the energy information interaction center; calculating the reliability according to at least all the obtained power distribution network reconstruction schemes includes: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
It should be noted that the reliability evaluation method for the power distribution network provided by the application researches the reliability of recovering load power supply by using the energy information interaction center, the reliability of the energy information interaction center and the reliability of all power distribution network reconstruction schemes; meanwhile, the reliability of all power distribution network reconstruction schemes is considered, and conditions such as network topology constraint, power constraint, branch current constraint, load terminal voltage constraint and the like are considered, which are not realized in the prior art.
Preferably, the calculating the reliability of recovering the load power supply by using the energy information interaction center comprises: determining that a superior power grid of the energy information interaction center fails; judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity; under the condition of failure in discharging or insufficient capacity, judging whether the energy can be transferred to other energy information interaction centers; the energy storage system supplies power to the load, so that the load loss of the system is reduced to the maximum extent; recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered; and calculating the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
Optionally, before it is determined that the upper-level grid of the energy information interaction center fails, the method further includes: determining a minimum path of an upper power supply of a specified load; and judging whether the upper power supply of the specified load can normally supply power, calculating the reliability index of the specified load through the equivalent model of the upper power supply and the reliability model of the power supply path under the condition that the upper power supply of the specified load can normally supply power, and determining that the upper power grid of the energy information interaction center has a fault under the condition that the upper power supply of the specified load cannot normally supply power.
It should be noted that: because the alternating current-direct current hybrid power distribution network with the energy information interaction center is equivalent to multi-power supply for loads. When the feeder line transformer fails, the system carries out distribution network reconstruction by closing the interconnection switch and adjusting active power circulated by the energy information interaction center to recover load power supply. The load of the transformer and the energy information interaction center on the carried feeder line is equivalent to the parallel connection relation, so that the fault rate of an equivalent power supply consisting of the transformer and the energy information interaction center and the reliability index of the load accumulated by the average outage time of each fault can be solved by using a parallel connection formula.
The specified load may be any load on the power distribution network, that is, the method may be executed multiple times to determine the reliability index of any load on the power distribution network.
The energy storage system can be an energy storage battery or a mobile power supply (for example, an electric vehicle).
For example, the following steps are carried out: the above evaluation flow for recovering the load power supply reliability by using the energy information interaction center is shown in fig. 4, that is:
step 1: determining a load superior power supply and energy information interaction center path;
step 2: if the superior power supply works normally, calculating a load power supply reliability index through the superior power supply equivalent model and the power supply path reliability model; if the upper power supply fails, going to step 3;
and step 3: searching for an energy storage system connected to a load, for example: the method comprises the steps that an energy storage battery and a mobile power supply (an electric automobile) are judged, whether an energy storage system can supply power to a load or not is judged, if yes, the step 4 is carried out, and if not, the step 6 is carried out;
and 4, step 4: judging whether the capacity of the energy storage system is sufficient when the energy storage system supplies power to the load, if so, going to the step 5, and if not, going to the step 6;
and 5: the energy storage system supplies power to the load, so that the load loss of the system is reduced to the maximum extent;
step 6: searching other energy information interaction centers interconnected with the energy information interaction center where the load is located, and performing power transfer;
and 7: judging whether the fault of the upper power supply is repaired or not, if so, recovering the power supply of the upper power supply, and if not, going to the step 3;
and 8: and calculating a reliability index.
It should be noted that: in order to perform comprehensive reliability evaluation on an alternating current-direct current hybrid power distribution system, reliability evaluation indexes can be generally divided into two types: a reliability index of the load point and a reliability index of the system. The index of the load point is used for measuring the power supply capacity of a single load point and is the basis for calculating the reliability index of the system; the system metrics are used to evaluate the ability of the system to directly supply and distribute power to users.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
The embodiment of the application further provides a power distribution network reliability evaluation device, and it should be noted that the power distribution network reliability evaluation device in the embodiment of the application can be used for executing the method for evaluating the reliability of the power distribution network provided in the embodiment of the application. The power distribution network reliability evaluation device provided by the embodiment of the application is introduced below.
Fig. 5 is a schematic diagram of a power distribution network reliability evaluation device according to an embodiment of the application. As shown in fig. 5, the apparatus includes: a determination unit 51, an adjustment unit 52, a first calculation unit 53, an execution unit 54, an acquisition unit 55, and a second calculation unit 56.
A determination unit 51 for determining that a predetermined load upper level power supply has failed;
the adjusting unit 52 is configured to perform distribution network reconfiguration by using a flexible interconnection function of an energy information interaction center to form a new distribution network structure, and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between a high-voltage alternating-current distribution network and a low-voltage alternating-current distribution network and is provided with a plurality of direct-current ports, so that plug-and-play of a direct-current load and a direct-current power supply can be realized, direct-current interconnection is realized, and switching between closed-loop operation and open-loop operation of a distribution network is performed;
a first calculating unit 53, configured to calculate a system load loss amount under the new distribution network structure;
the execution unit 54 is configured to repeatedly execute the adjustment unit 52 and the first calculation unit 53 to obtain a new distribution network structure with the minimum system loss load, and use the new distribution network structure as a distribution network reconfiguration scheme under the condition that the superior power supply fails;
the acquiring unit 55 is configured to repeatedly execute the adjusting unit 52 and the first calculating unit 53 for each upper power supply to obtain a power distribution network reconfiguration scheme of each upper power supply under the condition of a fault;
and a second calculating unit 56, configured to calculate reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes.
According to the reliability evaluation device for the power distribution network, the main transformer on the preset line is determined to have a fault through the determining step; adjusting, namely reconstructing a distribution network to form a new distribution network structure, and adjusting an energy information interaction center to recover load power supply, wherein the energy information interaction center is connected between a high-voltage alternating-current distribution network and a low-voltage alternating-current distribution network and is used for realizing plug-and-play of a direct-current load and a direct-current power supply, and performing direct-current interconnection with the layer of the high-voltage distribution network to switch closed-loop operation and open-loop operation of the distribution network; calculating the system load loss amount under the new distribution network structure; repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network result as a distribution network reconstruction scheme under the condition that the main transformer fails; the adjusting step and the calculating step are repeatedly executed for each main transformer, and a power distribution network reconstruction scheme of each main transformer under the condition of failure is obtained; and calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes. The technical problem that a traditional power distribution network reliability evaluation method cannot be directly applied to a power distribution network with an energy information interaction center due to the fact that flexible switching of multiple working modes is not involved in the related technology is solved, and therefore the power distribution network with the energy information interaction center is not adaptive to the power distribution network reliability evaluation method is solved, and the technical effect of performing reliability evaluation on the power distribution network with the energy information interaction center is achieved.
Optionally, the apparatus further comprises: the first calculating subunit is used for calculating the reliability of recovering the load power supply by using the energy information interaction center; the second calculation unit 56 includes: and the second calculating subunit calculates the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
Optionally, the first calculating subunit includes: the determining module is used for determining that the superior power grid of the energy information interaction center is in fault; the first judgment module is used for judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity; the second judgment module is used for judging whether the energy can be supplied to other energy information interaction centers or not under the condition of failure in discharging or insufficient capacity; the power supply module is used for supplying power to the load by the energy storage system so as to reduce the load loss of the system; the recovery module is used for recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered; and the computing module is used for computing the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
Optionally, the apparatus further comprises: the third calculating unit is used for calculating the reliability of the energy information interaction center; a second calculation unit 56, comprising: and the third computing subunit is used for computing the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
Optionally, the third computing unit includes: the dividing subunit is used for dividing the energy information interaction center into a preset number of subsystems; and the fourth calculating subunit is used for calculating the reliability of each subsystem respectively and calculating the reliability of the energy information interaction center according to the reliability of each subsystem.
The power distribution network reliability evaluation device comprises a processor and a memory, wherein the determining unit 51, the adjusting unit 52, the first calculating unit 53, the executing unit 54, the obtaining unit 55, the second calculating unit 56 and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more than one, and reliability evaluation is carried out on the power distribution network containing the energy information interaction center by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a storage medium, on which a program is stored, and when the program is executed by a processor, the method for evaluating reliability of a power distribution network is implemented.
The embodiment of the invention provides a processor, which is used for running a program, wherein the power distribution network reliability evaluation method is executed when the program runs.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein the processor executes the program and realizes the following steps: a determining step, namely determining that a preset load upper-level power supply fails; adjusting, namely reconstructing a distribution network by using a flexible interconnection function of an energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between a high-voltage alternating-current power distribution network and a low-voltage alternating-current power distribution network and is provided with a plurality of direct-current ports, so that plug-and-play of a direct-current load and a direct-current power supply can be realized, direct-current interconnection is realized, and switching between closed-loop operation and open-loop operation of the distribution network is performed; calculating the system load loss amount under the new distribution network structure; repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network structure as a distribution network reconstruction scheme under the condition that the superior power supply fails; the adjusting step and the calculating step are repeatedly executed for each superior power supply, and a power distribution network reconstruction scheme of each superior power supply under the condition of failure is obtained; and calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes.
Optionally, the method further includes: calculating the reliability of recovering the load power supply by using the energy information interaction center; calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
Optionally, calculating the reliability of recovering the load power supply by using the energy information interaction center includes: determining that a superior power grid of the energy information interaction center fails; judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity; under the condition of failure in discharging or insufficient capacity, judging whether the energy can be transferred to other energy information interaction centers; the energy storage system supplies power to the load so as to reduce the load loss of the system; recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered; and calculating the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
Optionally, the method further includes: calculating the reliability of the energy information interaction center; calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
Optionally, calculating the reliability of the energy information interaction center itself includes: dividing the energy information interaction center into a preset number of subsystems; and respectively calculating the reliability of each subsystem, and calculating the reliability of the energy information interaction center according to the reliability of each subsystem. The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program for initializing the following method steps when executed on a data processing device: a determining step, namely determining that a preset load upper-level power supply fails; adjusting, namely reconstructing a distribution network by using a flexible interconnection function of an energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between a high-voltage alternating-current power distribution network and a low-voltage alternating-current power distribution network and is provided with a plurality of direct-current ports, so that plug-and-play of a direct-current load and a direct-current power supply can be realized, direct-current interconnection is realized, and switching between closed-loop operation and open-loop operation of the distribution network is performed; calculating the system load loss amount under the new distribution network structure; repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network structure as a distribution network reconstruction scheme under the condition that the superior power supply fails; the adjusting step and the calculating step are repeatedly executed for each superior power supply, and a power distribution network reconstruction scheme of each superior power supply under the condition of failure is obtained; and calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes.
Optionally, the method further includes: calculating the reliability of recovering the load power supply by using the energy information interaction center; calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
Optionally, calculating the reliability of recovering the load power supply by using the energy information interaction center includes: determining that a superior power grid of the energy information interaction center fails; judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity; under the condition of failure in discharging or insufficient capacity, judging whether the energy can be transferred to other energy information interaction centers; the energy storage system supplies power to the load so as to reduce the load loss of the system to the maximum extent, and the power supply state of the superior power grid is recovered under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered; and calculating the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
Optionally, the method further includes: calculating the reliability of the energy information interaction center; calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
Optionally, calculating the reliability of the energy information interaction center itself includes: dividing the energy information interaction center into a preset number of subsystems; and respectively calculating the reliability of each subsystem, and calculating the reliability of the energy information interaction center according to the reliability of each subsystem.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A power distribution network reliability assessment method is characterized by comprising the following steps:
a determining step, namely determining that a preset load upper-level power supply fails;
adjusting, namely reconstructing a distribution network by using a flexible interconnection function of an energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between a high-voltage alternating-current power distribution network and a low-voltage alternating-current power distribution network and is provided with a plurality of direct-current ports, so that plug-and-play of a direct-current load and a direct-current power supply can be realized, direct-current interconnection is realized, and switching between closed-loop operation and open-loop operation of the distribution network is performed;
calculating the system load loss amount under the new distribution network structure;
repeatedly executing the adjusting step and the calculating step to obtain a new distribution network structure with the minimum system load loss amount, and taking the new distribution network structure as a distribution network reconstruction scheme under the condition that the superior power supply fails;
the adjusting step and the calculating step are repeatedly executed for each superior power supply, and a power distribution network reconstruction scheme of each superior power supply under the condition of failure is obtained;
and calculating the reliability of the power distribution network at least according to all the obtained power distribution network reconstruction schemes.
2. The method of claim 1,
the method further comprises the following steps: calculating the reliability of recovering the load power supply by using the energy information interaction center;
calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
3. The method of claim 2, wherein calculating the reliability of the restoration of the load power supply by the energy information interaction center comprises:
determining that a superior power grid of the energy information interaction center fails;
judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity;
under the condition of failure in discharging or insufficient capacity, judging whether the energy can be transferred to other energy information interaction centers;
the energy storage system supplies power to the load so as to reduce the load loss of the system;
recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered;
and calculating the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
4. The method of claim 1,
the method further comprises the following steps: calculating the reliability of the energy information interaction center;
calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network comprises the following steps: and calculating to obtain the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of the energy information interaction center.
5. The method of claim 4, wherein calculating the reliability of the energy information interaction center itself comprises:
dividing the energy information interaction center into a preset number of subsystems;
and respectively calculating the reliability of each subsystem, and calculating the reliability of the energy information interaction center according to the reliability of each subsystem.
6. An apparatus for evaluating reliability of a power distribution network, comprising:
the determining unit is used for determining that the upper-level power supply of the preset load has a fault;
the adjusting unit is used for reconstructing a distribution network by utilizing the flexible interconnection function of the energy information interaction center to form a new distribution network structure and recover load power supply to the maximum extent, wherein the energy information interaction center is connected between the high-voltage alternating-current distribution network and the low-voltage alternating-current distribution network and is provided with a plurality of direct current ports, so that the plug-and-play of a direct current load and a direct current power supply can be realized, the direct current interconnection is realized, and the switching between closed-loop operation and open-loop operation of the distribution network is performed;
the first calculation unit is used for calculating the system load loss under the new distribution network structure;
the execution unit is used for repeatedly executing the adjustment unit and the first calculation unit to obtain a new distribution network structure with the minimum system load loss amount, and the new distribution network structure is used as a distribution network reconstruction scheme under the condition that the superior power supply fails;
the acquisition unit is used for repeatedly executing the adjustment unit and the first calculation unit on each superior power supply to obtain a power distribution network reconstruction scheme of each superior power supply under the condition of failure;
and the second calculation unit is used for calculating the reliability of the power distribution network at least according to the obtained reconstruction schemes of the power distribution network.
7. The apparatus of claim 6,
the device further comprises: the first calculating subunit is used for calculating the reliability of recovering the load power supply by using the energy information interaction center;
the second calculation unit includes: and the second calculating subunit calculates the reliability of the power distribution network according to all power distribution network reconstruction schemes and the reliability of recovering the load power supply by using the energy information interaction center.
8. The apparatus of claim 7, wherein the first computing subunit comprises:
the determining module is used for determining that the superior power grid of the energy information interaction center is in fault;
the first judgment module is used for judging whether an energy storage system connected with a load can discharge and whether the energy storage system has sufficient capacity;
the second judgment module is used for judging whether the energy can be supplied to other energy information interaction centers or not under the condition of failure in discharging or insufficient capacity;
the power supply module is used for supplying power to the load by the energy storage system so as to reduce the load loss of the system;
the recovery module is used for recovering the power supply state of the superior power grid under the condition that the fault recovery of the superior power grid is judged and the normal power supply can be recovered;
and the computing module is used for computing the reliability of recovering the load power supply by using the energy information interaction center according to the judgment result.
9. A storage medium, characterized in that the storage medium includes a stored program, wherein the program executes the power distribution network reliability evaluation method according to any one of claims 1 to 5.
10. A processor, characterized in that the processor is configured to run a program, wherein the program is executed to perform the method of reliability assessment of power distribution network according to any of claims 1 to 5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383059A (en) * | 2020-11-27 | 2021-02-19 | 国网北京市电力公司 | Method and device for evaluating reliability of alternating current-direct current hybrid power distribution network |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530816A (en) * | 2013-10-10 | 2014-01-22 | 国家电网公司 | Power supply reliability-oriented secondary optimization evaluation model for reliability of power distribution network |
| CN104124686A (en) * | 2014-07-28 | 2014-10-29 | 国家电网公司 | Distribution network blocking theory based power grid optimized operation method |
| CN104392307A (en) * | 2014-11-11 | 2015-03-04 | 广西电网公司电力科学研究院 | Power distribution network automatic engineering-based reliability evaluation method |
| CN105552888A (en) * | 2015-12-23 | 2016-05-04 | 贵州电网有限责任公司 | Distribution network simulation method of considering interaction of main network and distribution network |
-
2019
- 2019-09-30 CN CN201910945767.4A patent/CN110707690A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103530816A (en) * | 2013-10-10 | 2014-01-22 | 国家电网公司 | Power supply reliability-oriented secondary optimization evaluation model for reliability of power distribution network |
| CN104124686A (en) * | 2014-07-28 | 2014-10-29 | 国家电网公司 | Distribution network blocking theory based power grid optimized operation method |
| CN104392307A (en) * | 2014-11-11 | 2015-03-04 | 广西电网公司电力科学研究院 | Power distribution network automatic engineering-based reliability evaluation method |
| CN105552888A (en) * | 2015-12-23 | 2016-05-04 | 贵州电网有限责任公司 | Distribution network simulation method of considering interaction of main network and distribution network |
Non-Patent Citations (1)
| Title |
|---|
| 程林等: "基于配网重构的交直流混联配电网可靠性分析", 《电力建设》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112383059A (en) * | 2020-11-27 | 2021-02-19 | 国网北京市电力公司 | Method and device for evaluating reliability of alternating current-direct current hybrid power distribution network |
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