CN116773971B - Method, device, equipment and medium for determining fault current of active power distribution network - Google Patents

Method, device, equipment and medium for determining fault current of active power distribution network Download PDF

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Publication number
CN116773971B
CN116773971B CN202311086861.1A CN202311086861A CN116773971B CN 116773971 B CN116773971 B CN 116773971B CN 202311086861 A CN202311086861 A CN 202311086861A CN 116773971 B CN116773971 B CN 116773971B
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fault
determining
power supply
current
line
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CN116773971A (en
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王逢浩
武晗
张宏阁
原泱
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Sprixin Technology Co ltd
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Sprixin Technology Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/088—Aspects of digital computing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The invention provides a method, a device, equipment and a medium for determining fault current of an active power distribution network, belonging to the technical field of power systems, wherein the method comprises the following steps: establishing a tree-shaped line structure with at least one power supply in an active power distribution network as a leaf node and a bus as a root node; determining a faulty line and a first impedance value; acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus; determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, a short circuit voltage of a bus, a first impedance value, second impedance values and short circuit currents of the non-fault power supplies; determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold; determining a fault current of the faulty line based on a sum of fault currents of the non-faulty lines; and determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line.

Description

Method, device, equipment and medium for determining fault current of active power distribution network
Technical Field
The present invention relates to the field of power systems, and in particular, to a method, an apparatus, a device, and a medium for determining fault current of an active power distribution network.
Background
Along with the distributed power supply, a large amount of distributed power supplies are connected into the power distribution network, so that the traditional power distribution network is gradually activated, a worker needs to perform relay protection positive determination calculation on a circuit, and when the worker performs relay protection positive determination calculation on the circuit, the worker often ignores the influence of fault current generated by the distributed power supply, and causes misoperation of a protection device, so that whether the protection device has misoperation due to the distributed power supply is checked.
In the prior art, when the protection misoperation is checked, a constant current source model or a controlled current source model is adopted for calculation.
The accuracy of the constant current source model is low, so that the deviation of a fault calculation result is overlarge, and the false judgment protection device is triggered by the calculation result to generate false actions; the controlled current source model needs iterative computation, the computation efficiency is low, the situation that iteration is not converged possibly occurs, the computation is failed, and the running risk of a power grid is increased.
Disclosure of Invention
The invention provides a method, a device, equipment and a medium for determining fault current of an active power distribution network, which are used for solving the defects of low efficiency and low accuracy of fault current calculation of the active power distribution network in the prior art and realizing rapid and accurate calculation of the fault current of the active power distribution network.
The invention provides a method for determining fault current of an active power distribution network, which comprises the following steps:
establishing a tree-shaped line structure with at least one power supply in an active power distribution network as a leaf node and a bus as a root node;
determining a faulty line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus;
acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus;
determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance value and the short circuit current of each non-fault power supply;
determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold;
determining a fault current of the faulty line based on a sum of fault currents of the non-faulty lines;
and determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line.
According to the method for determining the fault current of the active power distribution network, the equivalent constant current source model is expressed as an equation (1):
(1)
Wherein,for each of said non-faulty power supply a short-circuit voltage, < >>For each of said non-faulty power supplies a short-circuit current, < >>For each of said second impedance values +.>For the voltage of the busbar, +.>For the short-circuit voltage of the busbar, +.>An access capacity threshold for each of said non-faulty power supplies, < > a>For the sum of the short-circuit voltages of the non-faulty power supply at the bus bar, +.>Is the first impedance value.
According to the method for determining the fault current of the active power distribution network provided by the invention, the sum of the fault currents of the non-fault lines is determined based on a preset constraint equation and each access capacity threshold value, and the method comprises the following steps:
determining at least one access power supply meeting the preset constraint equation in each non-fault power supply;
obtaining the limit short-circuit current of each access power supply in the access power supplies;
comparing each of the limiting short-circuit currents, and determining the maximum value in each of the limiting short-circuit currents;
and determining the sum of fault currents of the non-fault lines based on the maximum value.
According to the method for determining the fault current of the active power distribution network, the preset constraint equation is expressed as an equation set (2):
(2)
wherein, In order to meet the access capacity threshold value of the access power supply of the preset constraint equation, < >>For the limiting short-circuit current of the access power supply, < >>For the short-circuit current of each of the non-faulty power supplies except the access power supply, +.>An access capacity threshold for each of said non-faulty power supplies except for said access power supply.
According to the method for determining the fault current of the active power distribution network provided by the invention, the fault current of the fault line is determined based on the sum of the fault currents of the non-fault lines, and the method comprises the following steps:
determining at least one node on the faulty line; the node is a T contact point of each distributed power supply on the fault line and the fault point;
determining the voltage increment of each node based on the sum of fault currents of the non-fault lines;
acquiring terminal voltage of each distributed power supply, and judging whether the terminal voltage of each distributed power supply meets an objective function or not;
under the condition that the terminal voltage of the distributed power supply meets an objective function, acquiring corresponding fault current of the distributed power supply meeting the objective function;
and determining the fault current of the fault line based on the sum of the fault currents of the distributed power supplies meeting the objective function.
According to the method for determining the fault current of the active power distribution network provided by the invention, the voltage increment of each node is determined based on the sum of the fault currents of the non-fault lines, and the method comprises the following steps:
calculating the voltage increment of each node by adopting a formula (3) based on the sum of fault currents of the non-fault lines:
（3）
wherein,for the voltage increment of each node, +.>Is the sum of the fault currents of the non-faulty line,impedance for each of the nodes to the point of failure.
According to the method for determining the fault current of the active power distribution network, provided by the invention, the method further comprises the following steps:
calculating the objective function using equation (4) based on the voltage increment of each of the nodes, the short-circuit voltage of each of the nodes, and the impedance of each of the distributed power sources to the fault point:
（4）
wherein,for the short-circuit voltage of the respective node, +.>Fault current for each of said distributed power sources +.>For each ofAnd the impedance of the distributed power supply to the fault point.
The invention also provides a device for determining the fault current of the active power distribution network, which comprises the following steps:
the building module is used for building a tree line structure with at least one power supply in the active power distribution network as a leaf node and a bus as a root node;
The first determining module is used for determining a fault line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus;
the acquisition module is used for acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus;
the second determining module is used for determining an access capacity threshold value of each non-fault power supply in the non-fault power supplies based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance values and the short circuit current of the non-fault power supplies;
the third determining module is used for determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold value;
a fourth determining module, configured to determine a fault current of the faulty line based on a sum of fault currents of the non-faulty line;
and a fifth determining module, configured to determine a fault current of the active power distribution network based on a sum of fault currents of the non-faulty line and a fault current of the faulty line.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the method for determining the fault current of the active power distribution network according to any one of the above when executing the program.
The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of determining a fault current of an active distribution network as described in any of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a method of determining a fault current of an active distribution network as described in any one of the above.
According to the method for determining the fault current of the active power distribution network, the distributed power supply in the active power distribution network is used as a leaf node, the bus is used as a root node to establish a tree-shaped single line diagram, the impedance value from the non-fault power supply on a non-fault line to the bus and the impedance value from the fault point on the fault line to the bus are obtained, and then the access capacity threshold value of each non-fault power supply is determined based on a preset equivalent constant current source model; and determining the sum of fault currents of the non-fault lines based on a constraint equation by taking the access capacity threshold value of each non-fault power supply as a constraint condition, further obtaining the fault currents of the fault lines, and finally determining the fault currents of the active power distribution network based on the fault currents of the fault lines and the fault currents of the non-fault lines. According to the method for determining the fault current of the active power distribution network, the fault current generated by each power supply is calculated, so that the defect of non-convergence caused by iterative calculation is avoided, and the accuracy of the calculation of the fault current of the active power distribution network is improved; and an equivalent model is formed by using the tree-shaped single line diagram, so that the storage space is reduced, the speed of calculating the fault current of the active power distribution network is improved, and the rapid calculation of the fault current of the active power distribution network is realized.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for determining fault current of an active power distribution network according to the present invention;
FIG. 2 is a tree circuit diagram of a method for determining fault current of an active power distribution network provided by the invention;
FIG. 3 is a second flow chart of a method for determining fault current of an active power distribution network according to the present invention;
FIG. 4 is a third flow chart of a method for determining fault current of an active power distribution network according to the present invention;
fig. 5 is a schematic structural diagram of a determining device for fault current of an active power distribution network according to the present invention;
fig. 6 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to facilitate a clearer understanding of various embodiments of the present invention, some relevant background knowledge is first presented as follows.
Distribution network: electrical energy is received from a power source side (grid, power generation facility, distributed power source, etc.) and distributed, either step-by-step or on-site, through a distribution facility to a power network of various customers.
Distributed photovoltaic power: the photovoltaic power generation equipment is constructed nearby a user site, the operation mode is characterized in that the user side is self-powered and self-powered, redundant electric quantity is used for surfing the internet, and balance adjustment is performed on a power distribution system.
Along with the distributed photovoltaic power supply, a large amount of distributed photovoltaic power supplies are connected into the power distribution network, so that the traditional power distribution network is gradually activated, a worker needs to perform relay protection positive calculation on a circuit, and when the worker performs relay protection positive calculation on the circuit, the worker often ignores the influence of fault current generated by the distributed power supply, and causes misoperation of a protection device, so that whether the protection device has misoperation due to the distributed power supply is checked.
In the prior art, when the protection misoperation is checked, a constant current source model or a controlled current source model is adopted for calculation. The accuracy of the constant current source model is low, so that the deviation of a fault calculation result is overlarge, and the false judgment protection device is triggered by the calculation result to generate false actions; the controlled current source model needs iterative computation, the computation efficiency is low, and the situation that iteration is not converged possibly occurs, so that the computation is failed, and the running risk of the power grid is increased.
In the prior art, aiming at an active power distribution network, fault current cannot be calculated rapidly and accurately, and whether a relay protection device can malfunction cannot be checked, so that the running risk of the power grid is increased.
In summary, in order to improve efficiency and accuracy of calculating fault current of an active power distribution network and reduce operation risk of a power grid, the embodiment of the invention provides a method, a device, equipment and a medium for determining fault current of the active power distribution network. The invention provides a method for determining the fault current of an active power distribution network, relates to the field of power equipment systems, in particular to the technical field of management of active power distribution network systems, and an execution subject of the method for determining the fault current of the active power distribution network can be any electronic equipment capable of realizing the method for determining the fault current of the active power distribution network.
The method, apparatus, device and medium for determining fault current of active distribution network according to the present invention are described below with reference to fig. 1 to 6.
Fig. 1 is one of flow diagrams of a method for determining fault current of an active power distribution network, provided by the invention, and as shown in fig. 1, the method for determining fault current of an active power distribution network in an embodiment of the invention includes the following steps:
step 101, establishing a tree line structure with at least one power supply in an active power distribution network as a leaf node and a bus as a root node;
Specifically, fig. 2 is a tree-shaped circuit diagram of the method for determining the fault current of the active power distribution network, as shown in fig. 2, in this step, a single line diagram of each circuit on the same bus in the active power distribution network is obtained, and a distributed power supply is provided on each single line. Taking the tree line structure of the active power distribution network shown in fig. 2 as an example, there are three intervals, namely 101 intervals, 102 intervals and 103 intervals. In an electrical power system, a power distribution device is typically composed of several different compartments, which refers to electrical circuits with specific functions, including circuit breakers, disconnectors, current transformers, etc. As shown in fig. 2, there are several single lines at each interval, and there is a PV on each single line, and a tree-shaped line structure is established by using the PV in the active power distribution network as a leaf node and a bus as a root node.
Step 102, determining a fault line and a first impedance value; the first impedance value is the impedance value from the fault point on the fault line to the bus;
specifically, in this step, the line where the fault point is determined is generally in a test scenario, where the line where the fault point is known to be located, and the sum of the impedance values on the path from the fault point to the bus, that is, the first impedance value, is a parameter value that can be directly obtained, as shown in fig. 2, where the fault point is on the line at the interval 103, and then the line 103 is the fault line.
Step 103, obtaining second impedance values from at least one non-fault power supply on the non-fault line to the bus respectively;
specifically, in this step, the interval lines except the faulty line are all non-faulty lines, such as interval 102 and interval 103 in fig. 2; and acquiring an accumulated impedance value of each non-fault power supply on the non-fault line, namely, each PV on the non-fault line on a path from each PV to the bus, namely, a second impedance value corresponding to each non-fault power supply.
104, determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, a short circuit voltage of a bus, a first impedance value, second impedance values and a short circuit current of each non-fault power supply;
specifically, in the step, a preset equivalent constant current source model is solved, an access capacity threshold value of each non-fault power supply on a non-fault line is obtained, and the short circuit voltage of a bus in the power distribution network, namely the bus short circuit voltage provided by a large power grid, is the bus fault voltage when the power distribution network is assumed to have no photovoltaic power supply.
Step 105, determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold;
Specifically, in this step, based on a preset constraint equation and the access capacity threshold of each non-fault power supply obtained in step 104, the sum of fault currents provided by the distributed photovoltaic power supplies on the other non-fault lines except the fault line is calculated on the same bus.
Step 106, determining the fault current of the fault line based on the sum of the fault currents of the non-fault lines;
specifically, in this step, the sum of the fault currents supplied by the distributed photovoltaic power supplies on the fault line is determined based on the sum of the fault currents supplied by the distributed photovoltaic power supplies on the non-fault line other than the fault line on the same bus.
And 107, determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line.
Specifically, in this step, the sum of the fault currents of the non-faulty line and the sum of the fault currents provided by the distributed photovoltaic power sources on the faulty line are added to obtain the fault currents of the breaker nodes on the faulty line, and the fault currents are regarded as the fault currents of the active power distribution network.
According to the method for determining the fault current of the active power distribution network, provided by the embodiment of the invention, a tree-shaped single line diagram is built by taking a distributed power supply in the active power distribution network as a leaf node and a bus as a root node, the impedance value from a non-fault power supply on a non-fault line to the bus and the impedance value from a fault point on the fault line to the bus are obtained, and the access capacity threshold value of each non-fault power supply is determined based on a preset equivalent constant current source model; and determining the sum of fault currents of the non-fault lines based on a constraint equation by taking the access capacity threshold value of each non-fault power supply as a constraint condition, further obtaining the fault currents of the fault lines, and finally determining the fault currents of the active power distribution network based on the fault currents of the fault lines and the fault currents of the non-fault lines. According to the method for determining the fault current of the active power distribution network, the fault current generated by each power supply is calculated, so that the defect of non-convergence caused by iterative calculation is avoided, and the accuracy of the calculation of the fault current of the active power distribution network is improved; and an equivalent model is formed by using the tree-shaped single line diagram, so that the storage space is reduced, the speed of calculating the fault current of the active power distribution network is improved, and the rapid calculation of the fault current of the active power distribution network is realized.
Optionally, according to the method for determining the fault current of the active power distribution network provided by the embodiment of the present invention, the equivalent constant current source model is expressed as equation set (1):
(1)
specifically, an equivalent constant current source model is solved according to the equation set (1), and the access capacity threshold value of each distributed photovoltaic power supply on the non-fault line is obtained by solving the equation set. In the set of equations (1),for the short-circuit voltage of the respective non-faulty power supply, i.e. of each distributed photovoltaic power supply on the non-faulty line + ->For the short-circuit current of the respective non-faulty power supply, i.e. of each distributed photovoltaic power supply on the non-faulty line + ->For each second impedance value, i.e. the cumulative impedance of the path of each photovoltaic power supply on the non-faulty line to the busbar, +.>For the voltage of the busbar>For short-circuit voltage of bus, ">For each non-faultAccess capacity threshold of power supply, ">For the sum of the short-circuit voltages of the non-faulty power supplies at the bus bar, +.>Is a first impedance value, i.e., the impedance from the point of failure to the bus bar. In a specific application of the embodiment of the invention, the short-circuit voltage of the bus is calculated by the following specific steps: the faults are divided into three-phase short-circuit faults and two-phase-to-phase and two-phase grounding short-circuit faults, wherein the three-phase short-circuit refers to the short circuit of two or more circuits in three-phase four wires, and the types mainly comprise three-phase short circuit, two-phase short circuit, single-phase short circuit and two-phase grounding short circuit. Wherein, the two-phase grounding short circuit refers to a short circuit generated by the single-phase grounding of any two phases in a neutral point ungrounded system; the two-phase short circuit refers to a short circuit between any two-phase conductors in a three-phase power supply and distribution system; a three-phase short circuit refers to a short circuit between three-phase conductors in a power supply and distribution system. Determining bus fault currents under different short circuit faults based on the following corresponding relations:
Wherein,for the impedance of the fault point to the busbar, i.e. the first impedance value, +.>The total impedance value representing the grid system is directly available, the bus fault current is determined based on the above formula, and the +.>I.e. the short-circuit voltage of the bus bar, is determined based on the following calculation: in the event of a three-phase short-circuit fault +.>In which two phases are separatedIn case of a two phase ground short-circuit fault +.>The equation is as follows: />。
According to the method for determining the fault current of the active power distribution network, provided by the embodiment of the invention, the access capacity threshold value of each distributed photovoltaic power supply in the non-fault line is determined through the equivalent constant current source model, and a foundation is laid for the definition of a follow-up constraint equation.
Optionally, in the method for determining the fault current of the active power distribution network provided by the embodiment of the present invention, the step 105 specifically includes the following steps, fig. 3 is a second flow chart of the method for determining the fault current of the active power distribution network provided by the present invention, and as shown in fig. 3, determining the sum of the fault currents of the non-faulty line based on a preset constraint equation and each access capacity threshold value includes:
step 1051, determining at least one access power supply meeting a preset constraint equation in each non-fault power supply;
Specifically, in this step, whether the distributed photovoltaic power supplies of each non-fault line satisfy a constraint equation is sequentially determined by having a plurality of distributed photovoltaic power supplies on the non-fault line, where the constraint equation is a relationship between one distributed photovoltaic power supply and other distributed photovoltaic power supplies except the distributed photovoltaic power supplies, the photovoltaic power supplies of each non-fault line and the other photovoltaic power supplies except the photovoltaic power supplies are sequentially brought into the constraint equation through a preset constraint equation, whether the photovoltaic power supplies satisfy the constraint condition is determined, if the photovoltaic power supplies satisfy the constraint equation, the photovoltaic power supplies are regarded as access power supplies, the access capacity threshold of the photovoltaic power supplies on the non-fault line in the constraint equation is regarded as a constraint condition, when the sum of the short-circuit currents provided by the photovoltaic power supplies on the other non-fault line except the photovoltaic power supplies is smaller than the access capacity threshold, and if the sum of the short-circuit currents provided by the other non-fault line except the photovoltaic power supplies is larger than the access capacity threshold, the photovoltaic power supplies are not accessed.
Step 1052, obtaining the limit short-circuit current of each access power supply in each access power supply;
Step 1053, comparing the limiting short-circuit currents, and determining the maximum value of the limiting short-circuit currents;
specifically, the steps 1052 and 1053 have the following embodiments:
firstly, calculating bus fault voltage without a photovoltaic power supply in a power distribution network, namelyAnd then calculating the short-circuit current of each photovoltaic power supply in the non-fault line, wherein the judging mode is that when the sum of the short-circuit currents provided by the photovoltaic power supplies on other non-fault lines except the photovoltaic power supply is smaller than the access capacity threshold value, the photovoltaic power supplies provide the short-circuit current, a critical value is determined based on a constraint equation, the limit short-circuit current of the photovoltaic power supply of each non-fault line is obtained, and then the limit short-circuit current of the photovoltaic power supply of each non-fault line is sequenced from small to large, so that the maximum value in the limit short-circuit currents is obtained.
Step 1054, determining a sum of fault currents of the non-faulty line based on the maximum value.
Specifically, in this step, after obtaining the limit short-circuit current value of each photovoltaic power supply on the non-faulty line, the maximum value thereof is selected as the sum of the fault currents of the non-faulty line. In the constraint equation, the sum of the short-circuit currents provided by the photovoltaic power sources on the other non-fault lines except the photovoltaic power source and the limit short-circuit current of the photovoltaic power source are critical values.
According to the method for determining the fault current of the active power distribution network, which is provided by the embodiment of the invention, the fault current generated by the non-fault power supply on the non-fault line is calculated through a bus fuzzy saturation method, and the fault current of the non-fault line is determined through a critical value determination method based on the access capacity threshold value of each non-fault power supply obtained through the steps.
Optionally, in the method for determining the fault current of the active power distribution network according to the embodiment of the present invention, the preset constraint equation in step 1051 is expressed as equation set (2):
(2)
wherein,in order to meet an access capacity threshold value of an access power supply of a preset constraint equation, in the constraint equation provided by the embodiment of the invention, a photovoltaic power supply of a non-fault line with a subscript of 0 is a photovoltaic power supply meeting the constraint equation, and the constraint equation is defined as +>For the limiting short-circuit current of the access power supply, +.>For short-circuit current of other non-fault power supply except the access power supply->Access capacity threshold for other non-faulty power sources than the access power source.
According to the method for determining the fault current of the active power distribution network, provided by the embodiment of the invention, the distributed photovoltaic power supply of the non-fault line meeting the constraint condition is determined based on the constraint equation.
Optionally, in the method for determining a fault current of an active power distribution network provided by the embodiment of the present invention, step 106 specifically includes the following steps, fig. 4 is a third flow chart of the method for determining a fault current of an active power distribution network provided by the present invention, and as shown in fig. 4, determining a fault current of a fault line based on a sum of fault currents of non-fault lines includes:
step 1061, determining at least one node on a faulty line; the node is a T contact point of each distributed power supply and the fault point on the fault line;
specifically, in this step, each of the distributed power supplies and the fault point ttoupling on the fault line, that is, the point at which the photovoltaic power supply T on each of the fault lines is connected to the fault loop is determined, referred to as a node, and the voltage and path impedance of each node, that is, the path impedance of each node to the fault point, respectively, are obtained.
Step 1062, determining a voltage increment of each node based on a sum of fault currents of the non-faulty line;
the sum of fault currents of the non-fault line is obtained through the steps, and the voltage increment of each node is calculated by adopting a formula (3):
（3）
wherein,for the voltage increment of each node, +.>Is the sum of the fault currents of the non-faulty line, Impedance for each of the nodes to the point of failure.
Step 1063, obtaining terminal voltages of each distributed power supply, and judging whether the terminal voltages of each distributed power supply meet an objective function;
in the step, terminal voltage of each distributed power supply on a fault line is obtained, and an objective function is calculated by adopting a formula (4):
（4）
in fact, the fact that,namely, the terminal voltage of the distributed power supply, and judging whether the terminal voltage meets the objective function in the formula (4).
Step 1064, obtaining a corresponding fault current of the distributed power supply meeting the objective function under the condition that the terminal voltage of the distributed power supply meets the objective function;
in this step, if the terminal voltage of the distributed power supply on the fault line satisfies the objective function, the fault current provided by the distributed power supply is obtained, and in the implementation, there are a plurality of distributed power supplies that satisfy the objective function.
Step 1065, determining a fault current of the faulty line based on a sum of fault currents of the distributed power sources that satisfy the objective function.
Specifically, based on the step 1064, the fault current provided by each distributed power supply that satisfies the objective function is obtained, and the fault currents provided by the distributed power supplies that satisfy the objective function are accumulated, so as to obtain the sum of the fault currents provided by the distributed power supplies on the fault line.
According to the method for determining the fault current of the active power distribution network, provided by the embodiment of the invention, the objective function is determined by calculating the voltage increment of each node on the fault loop, the distributed photovoltaic power sources of the fault line meeting the objective function are selected based on the objective function, the terminal voltages of the power sources are obtained, the fault current which can be provided by the power sources is obtained, and the fault current of each breaker node on the fault line is determined.
Optionally, in the method for determining the fault current of the active power distribution network according to the embodiment of the present invention, step 1062 is described above, where the voltage increment of each node is determined based on the sum of the fault currents of the non-faulty lines, and the method is specifically implemented as follows:
calculating the voltage increment of each node point by adopting a formula (3):
（3）
wherein,for the voltage increment of each node, +.>Is the sum of fault currents of non-faulty lines, +.>Impedance for each of the nodes to the point of failure.
Optionally, the method for determining the fault current of the active power distribution network provided by the embodiment of the invention further includes:
calculating an objective function by adopting a formula (4) based on the voltage increment of each node, the short-circuit voltage of each node and the impedance from each distributed power supply to a fault point:
（4）
Wherein,for the short-circuit voltage of each node +.>Fault current for each of said distributed power sources +.>And the impedance from each distributed power supply to the fault point is provided. Specifically, the->The calculation mode of (2) is equally divided into two cases, when three-phase short circuit fault occurs->When two-phase-to-phase and two-phase grounding short circuit fault occurs, < >>The method can be obtained by the equation group:，/>is the impedance of each node to the point of failure.
The determining device for the fault current of the active power distribution network provided by the invention is described below, and the determining device for the fault current of the active power distribution network and the determining method for the fault current of the active power distribution network described below can be referred to correspondingly. Fig. 5 is a schematic structural diagram of a determining device for an active power distribution network fault current according to the present invention, where, as shown in fig. 5, the determining device for an active power distribution network fault current includes:
the building module 501 is configured to build a tree line structure with at least one power supply in the active power distribution network as a leaf node and a bus as a root node;
a first determining module 502, configured to determine a faulty line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus;
an obtaining module 503, configured to obtain a second impedance value of each of the at least one non-fault power supply on the non-fault line to the bus;
A second determining module 504, configured to determine an access capacity threshold of each of the non-fault power supplies based on a preset equivalent constant current source model, a short-circuit voltage of the bus, the first impedance value, each of the second impedance values, and a short-circuit current of each of the non-fault power supplies;
a third determining module 505, configured to determine a sum of fault currents of the non-faulty line based on a preset constraint equation and each of the access capacity thresholds;
a fourth determining module 506, configured to determine a fault current of the faulty line based on a sum of fault currents of the non-faulty line;
and a fifth determining module 507, configured to determine a fault current of the active power distribution network based on a sum of fault currents of the non-faulty line and the fault current of the faulty line.
The device for determining the fault current of the active power distribution network provided by the embodiment of the invention realizes accurate and rapid calculation of the fault current of the active power distribution network through the mutual coordination of the modules. Establishing a tree-shaped single line diagram by taking a distributed power supply in an active power distribution network as a leaf node and a bus as a root node, acquiring impedance values from a non-fault power supply on a non-fault line to the bus and impedance values from a fault point on a fault line to the bus, and determining an access capacity threshold value of each non-fault power supply based on a preset equivalent constant current source model; and determining the sum of fault currents of the non-fault lines based on a constraint equation by taking the access capacity threshold value of each non-fault power supply as a constraint condition, further obtaining the fault currents of the fault lines, and finally determining the fault currents of the active power distribution network based on the fault currents of the fault lines and the fault currents of the non-fault lines. According to the method for determining the fault current of the active power distribution network, the fault current generated by each power supply is calculated, so that the defect of non-convergence caused by iterative calculation is avoided, and the accuracy of the calculation of the fault current of the active power distribution network is improved; and an equivalent model is formed by using the tree-shaped single line diagram, so that the storage space is reduced, the speed of calculating the fault current of the active power distribution network is improved, and the rapid calculation of the fault current of the active power distribution network is realized.
Optionally, the third determining module 505 specifically includes the following units:
the access power supply determining unit is used for determining at least one access power supply meeting a preset constraint equation in each non-fault power supply;
specifically, a plurality of distributed photovoltaic power supplies are arranged on a non-fault line, whether the distributed photovoltaic power supply of each non-fault line meets a constraint equation is judged in sequence, the constraint equation is used for limiting the relation between one distributed photovoltaic power supply and other distributed photovoltaic power supplies except the distributed photovoltaic power supplies, the photovoltaic light source of each non-fault line and other photovoltaic power supplies except the photovoltaic power supplies are brought into the constraint equation in sequence through a preset constraint equation, whether the photovoltaic power supplies meet constraint conditions is judged, if the photovoltaic power supplies meet the constraint equation, the photovoltaic power supplies are regarded as access power supplies, the access capacity threshold value of the photovoltaic power supplies on the non-fault line in the constraint equation is used as a limiting condition, when the sum of the short circuit currents provided by the photovoltaic power supplies on the other non-fault line except the photovoltaic power supplies is smaller than the access capacity threshold value, the photovoltaic power supplies provide short circuit currents, and if the sum of the short circuit currents provided by the photovoltaic power supplies on the other non-fault line except the photovoltaic power supplies is larger than the access capacity threshold value, the photovoltaic power supplies are not accessed.
The limiting short-circuit current acquisition unit is used for acquiring the limiting short-circuit current of each access power supply in the access power supplies;
the comparison unit is used for comparing the limiting short-circuit currents and determining the maximum value of the limiting short-circuit currents;
specifically, the limit short-circuit current acquisition unit and the comparison unit have the following embodiments:
firstly, calculating bus fault voltage without a photovoltaic power supply in a power distribution network, namelyAnd then calculating the short-circuit current of each photovoltaic power supply in the non-fault line, wherein the judging mode is that when the sum of the short-circuit currents provided by the photovoltaic power supplies on other non-fault lines except the photovoltaic power supply is smaller than the access capacity threshold value, the photovoltaic power supplies provide the short-circuit current, a critical value is determined based on a constraint equation, the limit short-circuit current of the photovoltaic power supply of each non-fault line is obtained, and then the limit short-circuit current of the photovoltaic power supply of each non-fault line is sequenced from small to large, so that the maximum value in the limit short-circuit currents is obtained.
And the non-fault line fault current determining unit is used for determining the sum of fault currents of the non-fault line based on the maximum value of the limit short-circuit currents.
Specifically, after obtaining the limit short-circuit current value of each photovoltaic power supply on the non-fault line, the maximum value is selected as the sum of fault currents of the non-fault line. In the constraint equation, the sum of the short-circuit currents provided by the photovoltaic power sources on the other non-fault lines except the photovoltaic power source and the limit short-circuit current of the photovoltaic power source are critical values.
Optionally, the fourth determining module 506 specifically includes the following units:
a node determining unit configured to determine at least one node on a faulty line; the node is a T contact point of each distributed power supply and the fault point on the fault line;
specifically, each distributed power supply on the fault line and the point T-junction of the fault point, i.e., the point at which the photovoltaic power supply T on each fault line is connected to the fault loop are determined, referred to as nodes, and the voltage and path impedance of each node, i.e., the path impedance of each node to the fault point, respectively, are obtained.
The voltage increment determining unit is used for determining the voltage increment of each node based on the sum of fault currents of the non-fault line;
the sum of fault currents of the non-fault line is obtained through the steps, and the voltage increment of each node is calculated by adopting a formula (3):
（3）
wherein,for the voltage increment of each node, +.>Is the sum of the fault currents of the non-faulty line,impedance for each of the nodes to the point of failure.
The judging unit is used for obtaining the terminal voltage of each distributed power supply and judging whether the terminal voltage of each distributed power supply meets an objective function or not;
in the step, terminal voltage of each distributed power supply on a fault line is obtained, and an objective function is calculated by adopting a formula (4):
（4）
In fact, the fact that,namely, the terminal voltage of the distributed power supply, and judging whether the terminal voltage meets the objective function in the formula (4).
The acquisition unit is used for acquiring the corresponding fault current of the distributed power supply meeting the objective function under the condition that the terminal voltage of the distributed power supply meets the objective function;
specifically, if the terminal voltage of the distributed power supply on the fault line meets the objective function, the fault current provided by the distributed power supply is obtained, and in a specific implementation, a plurality of distributed power supplies meeting the objective function are provided.
And a fault current determining unit for determining a fault current of the faulty line based on a sum of fault currents of the distributed power supplies each satisfying the objective function.
Specifically, after obtaining the fault current provided by each distributed power supply meeting the objective function, the fault currents provided by the distributed power supplies meeting the objective function are accumulated to obtain the sum of the fault currents provided by the distributed power supplies on the fault line.
Fig. 6 is a schematic structural diagram of an electronic device according to the present invention, and fig. 6 illustrates a schematic physical structural diagram of an electronic device, as shown in fig. 6, where the electronic device may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, and memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a method of determining active distribution network fault currents, the method comprising: establishing a tree-shaped line structure with at least one power supply in an active power distribution network as a leaf node and a bus as a root node; determining a faulty line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus; acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus; determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance value and the short circuit current of each non-fault power supply; determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold; determining a fault current of the faulty line based on a sum of fault currents of the non-faulty lines;
And determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, where the computer program product includes a computer program, where the computer program can be stored on a non-transitory computer readable storage medium, where the computer program when executed by a processor can perform a method for determining an active distribution network fault current provided by the above methods, where the method includes: establishing a tree-shaped line structure with at least one power supply in an active power distribution network as a leaf node and a bus as a root node;
Determining a faulty line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus; acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus; determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance value and the short circuit current of each non-fault power supply; determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold; determining a fault current of the faulty line based on a sum of fault currents of the non-faulty lines; and determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line.
In yet another aspect, the present invention further provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a method for determining a fault current of an active power distribution network provided by the above methods, the method comprising: establishing a tree-shaped line structure with at least one power supply in an active power distribution network as a leaf node and a bus as a root node;
Determining a faulty line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus; acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus; determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance value and the short circuit current of each non-fault power supply; determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold; determining a fault current of the faulty line based on a sum of fault currents of the non-faulty lines; and determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (7)

1. A method for determining fault current of an active power distribution network, comprising:
establishing a tree line structure with at least one power supply in the active power distribution network as a leaf node and a bus as a root node;
determining a faulty line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus;
acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus;
determining an access capacity threshold value of each non-fault power supply in each non-fault power supply based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance value and the short circuit current of each non-fault power supply;
determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold;
determining a fault current of the faulty line based on a sum of fault currents of the non-faulty lines;
determining the fault current of the active power distribution network based on the sum of the fault currents of the non-fault lines and the fault current of the fault line;
the equivalent constant current source model is expressed as equation (1):
(1)
Wherein,for each of said non-faulty power supply a short-circuit voltage, < >>For each of the non-faulty power supplies a short-circuit current,for each of said second impedance values +.>For the voltage of the busbar, +.>For the short-circuit voltage of the busbar, +.>An access capacity threshold for each of said non-faulty power supplies, < > a>For the sum of the short circuit voltages of each of the non-faulty power supplies at the bus bars,is the first impedance value;
the determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold value comprises the following steps:
determining at least one access power supply meeting the preset constraint equation in each non-fault power supply;
obtaining the limit short-circuit current of each access power supply in the access power supplies;
comparing each of the limiting short-circuit currents, and determining the maximum value in each of the limiting short-circuit currents;
determining a sum of fault currents of the non-faulty line based on the maximum value;
the preset constraint equation is expressed as equation set (2):
(2)
wherein,in order to meet the access capacity threshold value of the access power supply of the preset constraint equation, < >>For the limiting short-circuit current of the access power supply, < >>For the short-circuit current of each of the non-faulty power supplies except the access power supply, +. >An access capacity threshold for each of the non-faulty power supplies other than the access power supply.
2. The method for determining a fault current of an active power distribution network according to claim 1, wherein the determining a fault current of the faulty line based on a sum of fault currents of the non-faulty line comprises:
determining at least one node on the faulty line; the node is a T contact point of each distributed power supply on the fault line and the fault point;
determining the voltage increment of each node based on the sum of fault currents of the non-fault lines;
acquiring terminal voltage of each distributed power supply, and judging whether the terminal voltage of each distributed power supply meets an objective function or not;
under the condition that the terminal voltage of the distributed power supply meets an objective function, acquiring corresponding fault current of the distributed power supply meeting the objective function;
and determining the fault current of the fault line based on the sum of the fault currents of the distributed power supplies meeting the objective function.
3. The method for determining fault current of an active power distribution network according to claim 2, wherein said determining a voltage increment of each of said nodes based on a sum of fault currents of said non-faulty line comprises:
Calculating the voltage increment of each node by adopting a formula (3) based on the sum of fault currents of the non-fault lines:
（3）
wherein,is the sum of fault currents of the non-faulty line, < >>Impedance for each of the nodes to the point of failure.
4. A method of determining a fault current of an active power distribution network as claimed in claim 3, further comprising:
calculating the objective function using equation (4) based on the voltage increment of each of the nodes, the short-circuit voltage of each of the nodes, and the impedance of each of the distributed power sources to the fault point:
（4）
wherein,for the short-circuit voltage of the respective node, +.>Fault current for each of said distributed power sources +.>And the impedance from each distributed power supply to the fault point is provided.
5. An active distribution network fault current determining device is characterized by comprising:
the building module is used for building a tree line structure with at least one power supply in the active power distribution network as a leaf node and a bus as a root node;
the first determining module is used for determining a fault line and a first impedance value; the first impedance value is an impedance value from a fault point on the fault line to the bus;
the acquisition module is used for acquiring a second impedance value from each of at least one non-fault power supply on the non-fault line to the bus;
The second determining module is used for determining an access capacity threshold value of each non-fault power supply in the non-fault power supplies based on a preset equivalent constant current source model, the short circuit voltage of the bus, the first impedance value, the second impedance values and the short circuit current of the non-fault power supplies;
the third determining module is used for determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold value;
a fourth determining module, configured to determine a fault current of the faulty line based on a sum of fault currents of the non-faulty line;
a fifth determining module, configured to determine a fault current of the active power distribution network based on a sum of fault currents of the non-faulty lines and a fault current of the faulty line;
the equivalent constant current source model is expressed as equation (1):
(1)
wherein,for each of said non-faulty power supply a short-circuit voltage, < >>For each of the non-faulty power supplies a short-circuit current,for each of said second impedance values +.>For the voltage of the busbar, +.>For the short-circuit voltage of the busbar, +.>An access capacity threshold for each of said non-faulty power supplies, < > a>For the sum of the short circuit voltages of each of the non-faulty power supplies at the bus bars, Is the first impedance value;
the determining the sum of fault currents of the non-fault line based on a preset constraint equation and each access capacity threshold value comprises the following steps:
determining at least one access power supply meeting the preset constraint equation in each non-fault power supply;
obtaining the limit short-circuit current of each access power supply in the access power supplies;
comparing each of the limiting short-circuit currents, and determining the maximum value in each of the limiting short-circuit currents;
determining a sum of fault currents of the non-faulty line based on the maximum value;
the preset constraint equation is expressed as equation set (2):
(2)
wherein,in order to meet the access capacity threshold value of the access power supply of the preset constraint equation, < >>For the limiting short-circuit current of the access power supply, < >>For the short-circuit current of each of the non-faulty power supplies except the access power supply, +.>An access capacity threshold for each of the non-faulty power supplies other than the access power supply.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of determining the fault current of an active distribution network as claimed in any one of claims 1 to 4 when the program is executed by the processor.
7. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the method of determining an active distribution network fault current according to any of claims 1 to 4.
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