CN116381402A - Power distribution network fault analysis method and device with distributed photovoltaic access - Google Patents
Power distribution network fault analysis method and device with distributed photovoltaic access Download PDFInfo
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- 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
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- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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Abstract
The invention provides a power distribution network fault analysis method and device with distributed photovoltaic access. The power distribution network fault analysis method with the distributed photovoltaic access comprises the following steps: performing fault simulation at a fault point through a fault unit; determining a short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker as a first short-circuit current; determining a short-circuit current of a fault unit with a two-phase fault located upstream of the load as a second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access; determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value; and adjusting the protection fixed value according to the overcurrent protection sensitivity. The invention can effectively and quantitatively analyze the faults of the power distribution network and improve the power supply reliability.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power distribution network fault analysis method and device with distributed photovoltaic access.
Background
Under the background of the construction of a novel power system, the photovoltaic power generation has been rapidly developed with the advantages of abundant resources, cleanness, no pollution, mature technology, low cost and the like. The high proportion of distributed photovoltaic access changes the operational and fault characteristics of conventional distribution networks. Compared with the traditional generator set, the distributed photovoltaic power generation has randomness and intermittence. Because the distributed photovoltaic output and the user load have mismatch of space-time characteristics, the power distribution network commonly has the conditions of voltage high-low out-of-limit interweaving inversion, power flow back transmission, forward and reverse overload and the like. After the power distribution network breaks down, the distributed power supply can provide short-circuit current for the power distribution network, and the fault voltage and current of the traditional power distribution network are changed. Changes in the fault voltage and current of the power distribution network can affect the fault handling strategy and the power supply reliability of the power distribution network. Therefore, there is a need to develop high-proportion distributed photovoltaic access power distribution network fault voltage and current analysis, quantitatively analyze fault voltage and fault current variation trend, and provide a theoretical basis for researching an active power distribution network fault processing strategy.
Disclosure of Invention
The embodiment of the invention mainly aims to provide a power distribution network fault analysis method with distributed photovoltaic access, so as to effectively and quantitatively analyze power distribution network faults and improve power supply reliability.
In order to achieve the above objective, an embodiment of the present invention provides a method for analyzing faults of a power distribution network including distributed photovoltaic access, including:
performing fault simulation at a fault point through a fault unit;
determining a short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
determining a short-circuit current of a fault unit with a two-phase fault located upstream of the load as a second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access;
determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
and adjusting the protection fixed value according to the overcurrent protection sensitivity.
In one embodiment, the guard constant includes a first guard constant and a second guard constant;
determining the overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection constant value comprises:
determining a first overcurrent protection sensitivity according to the first short-circuit current and the first protection value;
And determining a second overcurrent protection sensitivity according to the second short-circuit current and the second protection fixed value.
In one embodiment, adjusting the protection setpoint based on the overcurrent protection sensitivity includes:
adjusting a first protection value according to a comparison result of the first overcurrent protection sensitivity and the first sensitivity threshold;
and adjusting the second protection fixed value according to the comparison result of the second overcurrent protection sensitivity and the second sensitivity threshold.
In one embodiment, the method further comprises:
opening a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and collecting the current and voltage of the total circuit breaker and the current and voltage of a fault point after the breaking circuit breaker is opened;
closing the breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and collecting the current and the voltage of the total circuit breaker and the current and the voltage of a fault point after the breaking circuit breaker is closed;
and determining a fault change index according to the current and the voltage of the total circuit breaker after the breaking circuit breaker is opened, the current and the voltage of the fault point and the current and the voltage of the total circuit breaker after the breaking circuit breaker is closed.
The embodiment of the invention also provides a power distribution network fault analysis device containing distributed photovoltaic access, which comprises:
The fault simulation module is used for performing fault simulation on the fault point through the fault unit;
a first short-circuit current module for determining a short-circuit current of a fault unit having a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
the second short-circuit current module is used for determining the short-circuit current of the fault unit with the two-phase fault, which is positioned at the upstream of the load, as the second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access;
the overcurrent protection sensitivity module is used for determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
and the protection fixed value adjusting module is used for adjusting the protection fixed value according to the overcurrent protection sensitivity.
In one embodiment, the guard constant includes a first guard constant and a second guard constant;
the overcurrent protection sensitivity module includes:
the first overcurrent protection sensitivity unit is used for determining the first overcurrent protection sensitivity according to the first short-circuit current and the first protection value;
and the second overcurrent protection sensitivity unit is used for determining the second overcurrent protection sensitivity according to the second short-circuit current and the second protection fixed value.
In one embodiment, the protection constant value adjustment module includes:
a first protection value adjusting unit for adjusting the first protection value according to the comparison result of the first overcurrent protection sensitivity and the first sensitivity threshold;
and the second protection fixed value adjusting unit is used for adjusting the second protection fixed value according to the comparison result of the second overcurrent protection sensitivity and the second sensitivity threshold.
In one embodiment, the method further comprises:
the first acquisition module is used for opening a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and acquiring the current and the voltage of the total circuit breaker and the current and the voltage of a fault point after the breaking circuit breaker is opened;
the second acquisition module is used for closing a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and acquiring the current and the voltage of the total circuit breaker and the current and the voltage of a fault point after the breaking circuit breaker is closed;
the fault change index module is used for determining a fault change index according to the current and the voltage of the total circuit breaker after the breaking circuit breaker is opened, the current and the voltage of the fault point and the current and the voltage of the total circuit breaker after the breaking circuit breaker is closed.
The embodiment of the invention also provides electronic equipment, which comprises a memory, a processor and a computer program stored on the memory and running on the processor, wherein the steps of the power distribution network fault analysis method containing distributed photovoltaic access are realized when the processor executes the computer program.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the power distribution network fault analysis method containing the distributed photovoltaic access when being executed by a processor.
The embodiment of the invention also provides a computer program product, which comprises a computer program/instruction, wherein the computer program/instruction realizes the steps of the power distribution network fault analysis method containing the distributed photovoltaic access when being executed by a processor.
According to the power distribution network fault analysis method and device with the distributed photovoltaic access, after fault simulation is carried out, the overcurrent protection sensitivity is determined according to the fault unit short-circuit current positioned at the downstream of the total circuit breaker, the fault unit short-circuit current positioned at the upstream of the load and the protection fixed value so as to adjust the protection fixed value, so that the power distribution network fault can be effectively and quantitatively analyzed, and the power supply reliability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method of failure analysis of a power distribution network including distributed photovoltaic access in an embodiment of the present invention;
FIG. 2 is a flow chart of S104 in an embodiment of the invention;
FIG. 3 is a flowchart of S105 in an embodiment of the present invention;
FIG. 4 is a flow chart of determining a fault change indicator in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a power distribution network fault simulation model including distributed photovoltaic access in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a distribution line fault unit in an embodiment of the present invention;
FIG. 7 is a block diagram of a power distribution network fault analysis device including distributed photovoltaic access in an embodiment of the present invention;
fig. 8 is a schematic block diagram of a system configuration of an electronic device 9600 of an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but 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.
Those skilled in the art will appreciate that embodiments of the invention may be implemented as a system, apparatus, device, method, or computer program product. Accordingly, the present disclosure may be embodied in the following forms, namely: complete hardware, complete software (including firmware, resident software, micro-code, etc.), or a combination of hardware and software.
In view of the fact that the change of the fault voltage and current of the power distribution network can affect the fault processing strategy and the power supply reliability of the power distribution network, the embodiment of the invention provides the power distribution network fault analysis method and device with the distributed photovoltaic access, the faults of the power distribution network can be effectively and quantitatively analyzed, and the power supply reliability is improved.
Fig. 1 is a flowchart of a method for analyzing faults of a power distribution network including distributed photovoltaic access according to an embodiment of the present invention. As shown in fig. 1, the fault analysis method for the power distribution network with the distributed photovoltaic access comprises the following steps:
s101: and performing fault simulation at the fault point through the fault unit.
Fig. 5 is a schematic diagram of a power distribution network fault simulation model including distributed photovoltaic access in an embodiment of the present invention. As shown in fig. 5, the grid structure of the power distribution network fault simulation model may be an overhead line such as single-radiation and multi-section moderate connection, or may be a cable line such as a single-ring network or a double-ring network. The model comprises modules such as a main network system side equivalent power supply Es, a system side equivalent impedance Zs, a main transformer Tm, a 10kV BUS (10 kV BUS), distribution line units (L1, L2 and L3 are main line units, L4 is branch line units and L5 is adjacent line units), distribution transformers Td1 and Td2, switches B1-B5, a 0.4kV BUS (0.4 kV BUS), distribution line fault units F1-F5, distributed photovoltaics DG1 and DG2, loads Load1-3 and the like.
The main network system side equivalent power supply model Es is an ideal voltage source, the voltage amplitude is 110kV or 35kV, the frequency is 50Hz, and the initial phase angle is 0 degree.
The equivalent impedance Zs at the system side is converted according to the short-circuit capacity.
The main transformer Tm is a main transformer model of a transformer substation, Y/d11 wiring is adopted, the transformation ratio is set according to the voltage level of the high-voltage side and the low-voltage side, and parameters such as copper loss, no-load loss and leakage reactance of the transformer are calculated according to nameplate information.
The medium-voltage distribution network generally does not consider distribution parameters, and the distribution line unit adopts a pi-shaped line model. The positive sequence resistance, positive sequence inductance, positive sequence capacitance resistance, zero sequence inductance and zero sequence capacitance resistance in the pi-type line model are calculated according to a line parameter table or a test and test value.
The load module consists of a resistive load and an inductive load, and the load power capacity is set according to the simulation requirement.
The distributed photovoltaic can adopt a white box modeling method, the white box model hardware structure is a three-phase grid-connected inverter, and the control mode adopts single-ring or double-ring control. Distributed photovoltaics may also employ a controllable current source modeling approach. Regardless of the modeling method, the distributed photovoltaic should have low voltage ride through characteristics, and provide active or reactive support current according to a control strategy after a power distribution network fails. In order to improve the modeling accuracy of the distributed photovoltaic model, the output external characteristics of the distributed photovoltaic model are preferably compared with the output characteristics of the physical distributed photovoltaic model.
Fig. 6 is a schematic diagram of a distribution line fault unit in an embodiment of the present invention. As shown in fig. 6, the distribution line fault unit can simulate phase-to-phase fault and ground fault, and the phase-to-phase fault resistor R ac 、R ab 、R bc And ground resistance R ag 、R bg 、R cg The size of the (C) can be flexibly set.
The method is mainly used for quantitatively analyzing the voltage and current at the protection installation position of the outlet circuit breaker of the B1 transformer substation, the voltage and current at the switch of the first section of the B2 large branch, the voltage and current at the fault point and the voltage and current at the distributed photovoltaic grid-connected point. The fault point F1 is located upstream of the grid-connected point of the distributed photovoltaic 1, the fault point F2 is located downstream of the grid-connected point of the distributed photovoltaic 1, the fault point F3 is located downstream of the grid-connected point of the distributed photovoltaic 2, the fault point F4 is located at the tail end of a line branch, and the fault point F5 is located adjacent to a 10kV bus and is outgoing line of 10 kV.
B1 substation outlet breaker protection can be generally configured with overcurrent I, II and III section protection. The sensitivity of the over-current protection can be influenced by the distributed new energy connected into the power distribution network, and the sensitivity of the over-current protection can be effectively calculated by applying the fault current analysis result.
S102: the short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker is determined as a first short-circuit current.
Wherein the fault unit is located between the total breaker B1 and the main line unit L1 (not shown), a three-phase fault representing R in the fault unit ac 、R ab 、R bc Metallic faults (resistance 0.001 Ω) occur.
S103: and determining the short-circuit current of the fault unit with the two-phase fault positioned upstream of the load as a second short-circuit current.
The total circuit breaker, the load and the fault unit are all located in the power distribution network with the distributed photovoltaic access.
The faulty unit is a faulty unit F3 located upstream of the first Load1, the two-phase fault representing R in the faulty unit ac And R is ab Metallic failure, or R ac And R is bc Metallic failure, or R ab And R is bc Metallic failure (resistance 0.001 Ω) occurred.
S104: and determining the overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value.
The protection fixed value comprises a first protection fixed value and a second protection fixed value.
Fig. 2 is a flowchart of S104 in the embodiment of the present invention. As shown in fig. 2, S104 includes:
s201: the first overcurrent protection sensitivity is determined based on the first short-circuit current and the first protection value.
In one embodiment, the first overcurrent protection sensitivity may be determined by the following formula:
wherein K is B1-1 For the first overcurrent protection sensitivity, I B1-DG-3 For the first short-circuit current, I set1 Is a first protection value (the protection value of the overcurrent I section at the position B1).
S202: and determining a second overcurrent protection sensitivity according to the second short-circuit current and the second protection fixed value.
In one embodiment, the second overcurrent protection sensitivity may be determined by the following formula:
wherein K is B1-2 For the second overcurrent protection sensitivity, I L-DG-2 For the second short-circuit current, I set2 Is a second protection fixed value (the overcurrent II section protection fixed value at the position B1).
S105: and adjusting the protection fixed value according to the overcurrent protection sensitivity.
Fig. 3 is a flowchart of S105 in the embodiment of the present invention. As shown in fig. 3, S105 includes:
s301: and adjusting the first protection value according to the comparison result of the first overcurrent protection sensitivity and the first sensitivity threshold.
Wherein the first sensitivity threshold may be 1. And when the first overcurrent protection sensitivity is smaller than the first sensitivity threshold, adjusting the first protection value.
S302: and adjusting the second protection fixed value according to the comparison result of the second overcurrent protection sensitivity and the second sensitivity threshold.
Wherein the second sensitivity threshold may be 1. And when the first overcurrent protection sensitivity is smaller than the first sensitivity threshold, adjusting the first protection value.
FIG. 4 is a flow chart of determining a fault change indicator in an embodiment of the present invention. As shown in fig. 4, the fault analysis method for the power distribution network with the distributed photovoltaic access further includes:
S401: opening a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and collecting the current and voltage of the total circuit breaker and the current and voltage of a fault point after the breaking circuit breaker is opened.
S402: and closing a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and collecting the current and the voltage of the total circuit breaker and the current and the voltage of a fault point after the breaking circuit breaker is closed.
S403: and determining a fault change index according to the current and the voltage of the total circuit breaker after the breaking circuit breaker is opened, the current and the voltage of the fault point and the current and the voltage of the total circuit breaker after the breaking circuit breaker is closed.
The distributed photovoltaic capacity, the access location, the distributed photovoltaic current output phase angle, the type of power distribution network fault and the fault transition resistance can affect the fault voltage and current of the power distribution network.
1. Fixing the distributed photovoltaic capacity, the access position and the output phase angle of the distributed photovoltaic current, opening the switches B4 and B5, simulating a three-phase short-circuit ground fault at the F1 point, and obtaining the current I of the switch B1, wherein the transition resistance is 0.001 omega B1-N-F1 Voltage U B1-N-F1 (current, voltage of total breaker after breaking breaker open) and fault point current I F-N-F1 Voltage U F-N-F1 (breaking the current, voltage of the fault point after the circuit breaker is opened). Closing the switches B4 and B5, repeating the fault simulation to obtain the current I of the switch B1 B1-DG1-F1 Voltage U B1-DG1-F1 (current, voltage of total breaker after breaking breaker closing) and fault point current I F-DG1-F1 Voltage U F-DG1-F1 (current, voltage of fault point after breaking the circuit breaker closed). Calculating the variation index CI of the fault quantity B1-DG1-F1 、CU B1-DG1-F1 、CI F-DG1-F1 And CI (CI) F-DG1-F1 . For example:
wherein CI is B1-DG1-F1 As the current fault change index of the total breaker, CU B1-DG1-F1 CI as voltage fault change index of total circuit breaker F-DG1-F1 CI for breaking current fault change index of circuit breaker F-DG1-F1 Is the voltage fault change index of the breaking circuit breaker.
The simulation is then repeated at F2, F3, F4 and F5.
2. And fixing the fault position, the fault type, the transition resistance, the photovoltaic access position and the output phase angle, and changing the distributed photovoltaic access capacity. Firstly, opening the switches B4 and B5, performing fault simulation, and collecting the current and voltage of the total circuit breaker and the current and voltage of a fault point after the circuit breaker is opened; then the switches B4 and B5 are closed to perform fault simulation to obtain the current I of the switch B1 B1-DG2-F1 Voltage U B1-DG2-F1 (current, voltage of total breaker after breaking breaker closing) and fault point current I F-DG2-F1 Voltage U F-DG2-F1 (current, voltage of fault point after breaking the circuit breaker closed). Calculating the variation index CI of the fault quantity B1-DG2-F1 、CU B1-DG2-F1 、CI F-DG2-F1 And CI (CI) F-DG2-F1 。
3. And fixing the fault position, the fault type, the transition resistance, the photovoltaic access capacity and the output phase angle, and changing the distributed photovoltaic access position. Firstly, opening the switches B4 and B5, performing fault simulation, and collecting the current and voltage of the total circuit breaker and the current and voltage of a fault point after the circuit breaker is opened; then the switches B4 and B5 are closed to perform fault simulation to obtain the current I of the switch B1 B1-DG3-F1 Voltage U B1-DG3-F1 (current, voltage of total breaker after breaking breaker closing) and fault point current I F-DG3-F1 Voltage U F-DG3-F1 (current, voltage of fault point after breaking the circuit breaker closed). Calculating the variation index CI of the fault quantity B1-DG3-F1 、CU B1-DG3-F1 、CI F-DG3-F1 And CI (CI) F-DG3-F1 。
4. Fixing fault position, fault type, transition resistance, photovoltaic access capacity and photovoltaic access position, and changing lightThe volt output phase angle. Firstly, opening the switches B4 and B5, performing fault simulation, and collecting the current and voltage of the total circuit breaker and the current and voltage of a fault point after the circuit breaker is opened; then the switches B4 and B5 are closed to perform fault simulation to obtain the current I of the switch B1 B1-DG4-F1 Voltage U B1-DG4-F1 (current, voltage of total breaker after breaking breaker closing) and fault point current I F-DG4-F1 Voltage U F-DG4-F1 (current, voltage of fault point after breaking the circuit breaker closed). Calculating the variation index CI of the fault quantity B1-DG4-F1 、CU B1-DG4-F1 、CI F-DG4-F1 And CI (CI) F-DG4-F1 。
5. And (3) changing the fault type and the transition resistance, and repeating the steps 1-4 to analyze the fault voltage and current characteristics of the active power distribution network under different working conditions.
The main execution body of the power distribution network fault analysis method with distributed photovoltaic access shown in fig. 1 may be a computer. As can be seen from the flow shown in fig. 1, the fault analysis method for the power distribution network with distributed photovoltaic access according to the embodiment of the invention determines the overcurrent protection sensitivity according to the fault unit short-circuit current located at the downstream of the total circuit breaker, the fault unit short-circuit current located at the upstream of the load and the protection constant value to adjust the protection constant value after performing fault simulation, so that the fault of the power distribution network can be effectively and quantitatively analyzed, and the power supply reliability can be improved.
Based on the same inventive concept, the embodiment of the invention also provides a power distribution network fault analysis device with distributed photovoltaic access, and because the principle of the device for solving the problem is similar to that of the power distribution network fault analysis method with distributed photovoltaic access, the implementation of the device can be referred to the implementation of the method, and the repeated parts are not repeated.
Fig. 7 is a block diagram of a power distribution network fault analysis device including distributed photovoltaic access in an embodiment of the present invention. As shown in fig. 7, the power distribution network fault analysis device with distributed photovoltaic access includes:
the fault simulation module is used for performing fault simulation on the fault point through the fault unit;
a first short-circuit current module for determining a short-circuit current of a fault unit having a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
the second short-circuit current module is used for determining the short-circuit current of the fault unit with the two-phase fault, which is positioned at the upstream of the load, as the second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access;
the overcurrent protection sensitivity module is used for determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
And the protection fixed value adjusting module is used for adjusting the protection fixed value according to the overcurrent protection sensitivity.
In one embodiment, the guard constant includes a first guard constant and a second guard constant;
the overcurrent protection sensitivity module includes:
the first overcurrent protection sensitivity unit is used for determining the first overcurrent protection sensitivity according to the first short-circuit current and the first protection value;
and the second overcurrent protection sensitivity unit is used for determining the second overcurrent protection sensitivity according to the second short-circuit current and the second protection fixed value.
In one embodiment, the protection constant value adjustment module includes:
a first protection value adjusting unit for adjusting the first protection value according to the comparison result of the first overcurrent protection sensitivity and the first sensitivity threshold;
and the second protection fixed value adjusting unit is used for adjusting the second protection fixed value according to the comparison result of the second overcurrent protection sensitivity and the second sensitivity threshold.
In one embodiment, the method further comprises:
the first acquisition module is used for opening a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and acquiring the current and the voltage of the total circuit breaker and the current and the voltage of a fault point after the breaking circuit breaker is opened;
The second acquisition module is used for closing a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and acquiring the current and the voltage of the total circuit breaker and the current and the voltage of a fault point after the breaking circuit breaker is closed;
the fault change index module is used for determining a fault change index according to the current and the voltage of the total circuit breaker after the breaking circuit breaker is opened, the current and the voltage of the fault point and the current and the voltage of the total circuit breaker after the breaking circuit breaker is closed.
After the fault simulation is carried out on the power distribution network fault analysis device with the distributed photovoltaic access, the overcurrent protection sensitivity is determined according to the fault unit short-circuit current positioned at the downstream of the total circuit breaker, the fault unit short-circuit current positioned at the upstream of the load and the protection fixed value so as to adjust the protection fixed value, so that the power distribution network fault can be effectively and quantitatively analyzed, and the power supply reliability is improved.
Fig. 8 is a schematic block diagram of a system configuration of an electronic device 9600 of an embodiment of the present application. As shown in fig. 8, the electronic device 9600 may include a central processor 9100 and a memory 9140; the memory 9140 is coupled to the central processor 9100. Notably, this fig. 8 is exemplary; other types of structures may also be used in addition to or in place of the structures to implement telecommunications functions or other functions.
In one embodiment, the power distribution network fault analysis method functionality including distributed photovoltaic access may be integrated into the central processor 9100. The central processor 9100 may be configured to perform the following control:
performing fault simulation at a fault point through a fault unit;
determining a short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
determining a short-circuit current of a fault unit with a two-phase fault located upstream of the load as a second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access;
determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
and adjusting the protection fixed value according to the overcurrent protection sensitivity.
From the above description, the power distribution network fault analysis method with distributed photovoltaic access provided by the application determines the overcurrent protection sensitivity according to the fault unit short-circuit current positioned at the downstream of the total circuit breaker, the fault unit short-circuit current positioned at the upstream of the load and the protection fixed value after fault simulation so as to adjust the protection fixed value, so that the power distribution network fault can be effectively and quantitatively analyzed, and the power supply reliability is improved.
In another embodiment, the power distribution network fault analysis device with the distributed photovoltaic access may be configured separately from the central processor 9100, for example, the power distribution network fault analysis device with the distributed photovoltaic access may be configured as a chip connected to the central processor 9100, and the function of the power distribution network fault analysis method with the distributed photovoltaic access is implemented by the control of the central processor.
As shown in fig. 8, the electronic device 9600 may further include: a communication module 9110, an input unit 9120, an audio processor 9130, a display 9160, and a power supply 9170. It is noted that the electronic device 9600 need not include all of the components shown in fig. 8; in addition, the electronic device 9600 may further include components not shown in fig. 8, and reference may be made to the related art.
As shown in fig. 8, the central processor 9100, sometimes referred to as a controller or operational control, may include a microprocessor or other processor device and/or logic device, which central processor 9100 receives inputs and controls the operation of the various components of the electronic device 9600.
The memory 9140 may be, for example, one or more of a buffer, a flash memory, a hard drive, a removable media, a volatile memory, a non-volatile memory, or other suitable device. The information about failure may be stored, and a program for executing the information may be stored. And the central processor 9100 can execute the program stored in the memory 9140 to realize information storage or processing, and the like.
The input unit 9120 provides input to the central processor 9100. The input unit 9120 is, for example, a key or a touch input device. The power supply 9170 is used to provide power to the electronic device 9600. The display 9160 is used for displaying display objects such as images and characters. The display may be, for example, but not limited to, an LCD display.
The memory 9140 may be a solid state memory such as Read Only Memory (ROM), random Access Memory (RAM), SIM card, etc. But also a memory which holds information even when powered down, can be selectively erased and provided with further data, an example of which is sometimes referred to as EPROM or the like. The memory 9140 may also be some other type of device. The memory 9140 includes a buffer 9141 (sometimes referred to as a buffer memory). The memory 9140 may include an application/function storage portion 9142, the application/function storage portion 9142 storing application programs and function programs or a flow for executing operations of the electronic device 9600 by the central processor 9100.
The memory 9140 may also include a data store 9143, the data store 9143 for storing data, such as contacts, digital data, pictures, sounds, and/or any other data used by an electronic device. The driver storage portion 9144 of the memory 9140 may include various drivers of the electronic device for communication functions and/or for performing other functions of the electronic device (e.g., messaging applications, address book applications, etc.).
The communication module 9110 is a transmitter/receiver 9110 that transmits and receives signals via an antenna 9111. A communication module (transmitter/receiver) 9110 is coupled to the central processor 9100 to provide input signals and receive output signals, as in the case of conventional mobile communication terminals.
Based on different communication technologies, a plurality of communication modules 9110, such as a cellular network module, a bluetooth module, and/or a wireless local area network module, etc., may be provided in the same electronic device. The communication module (transmitter/receiver) 9110 is also coupled to a speaker 9131 and a microphone 9132 via an audio processor 9130 to provide audio output via the speaker 9131 and to receive audio input from the microphone 9132 to implement usual telecommunications functions. The audio processor 9130 can include any suitable buffers, decoders, amplifiers and so forth. In addition, the audio processor 9130 is also coupled to the central processor 9100 so that sound can be recorded locally through the microphone 9132 and sound stored locally can be played through the speaker 9131.
The embodiment of the present invention further provides a computer readable storage medium capable of implementing all the steps in the power distribution network fault analysis method including distributed photovoltaic access in the embodiment in which the execution subject is a server or a client, where the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements all the steps in the power distribution network fault analysis method including distributed photovoltaic access in the embodiment, for example, the processor implements the following steps when executing the computer program:
Performing fault simulation at a fault point through a fault unit;
determining a short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
determining a short-circuit current of a fault unit with a two-phase fault located upstream of the load as a second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access;
determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
and adjusting the protection fixed value according to the overcurrent protection sensitivity.
In summary, after the computer readable storage medium of the embodiment of the invention carries out fault simulation, the overcurrent protection sensitivity is determined according to the fault unit short-circuit current positioned at the downstream of the total circuit breaker, the fault unit short-circuit current positioned at the upstream of the load and the protection fixed value so as to adjust the protection fixed value, thereby effectively and quantitatively analyzing the faults of the power distribution network and improving the power supply reliability.
The embodiment of the present invention further provides a computer program product capable of implementing all the steps in the power distribution network fault analysis method including distributed photovoltaic access in the embodiment in which the execution subject is a server or a client, where the computer program product includes a computer program/instruction, where the computer program/instruction when executed by a processor implements all the steps in the power distribution network fault analysis method including distributed photovoltaic access in the embodiment in which the processor implements, for example, the following steps when the processor executes the computer program:
Performing fault simulation at a fault point through a fault unit;
determining a short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
determining a short-circuit current of a fault unit with a two-phase fault located upstream of the load as a second short-circuit current; the total circuit breaker, the load and the fault unit are all positioned in the power distribution network with the distributed photovoltaic access;
determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
and adjusting the protection fixed value according to the overcurrent protection sensitivity.
In summary, after the computer program product of the embodiment of the invention carries out fault simulation, the overcurrent protection sensitivity is determined according to the fault unit short-circuit current positioned at the downstream of the total circuit breaker, the fault unit short-circuit current positioned at the upstream of the load and the protection fixed value so as to adjust the protection fixed value, thereby effectively and quantitatively analyzing the faults of the power distribution network and improving the power supply reliability.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for a hardware+program class embodiment, the description is relatively simple, as it is substantially similar to the method embodiment, as relevant see the partial description of the method embodiment.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.
Although the present application provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive labor. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented by an actual device or client product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment) as shown in the embodiments or figures.
Although the present description provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented in an actual device or end product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even in a distributed data processing environment) as illustrated by the embodiments or by the figures. 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, it is not excluded that additional identical or equivalent elements may be present in a process, method, article, or apparatus that comprises a described element.
For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, when implementing the embodiments of the present disclosure, the functions of each module may be implemented in the same or multiple pieces of software and/or hardware, or a module that implements the same function may be implemented by multiple sub-modules or a combination of sub-units, or the like. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller can be regarded as a hardware component, and means for implementing various functions included therein can also be regarded as a structure within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
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). Memory is an example of computer-readable media.
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 storage media for a computer 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 disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It will be appreciated by those skilled in the art that embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, the present specification embodiments may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present description embodiments may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments in this specification may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The embodiments of the specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the present specification. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The foregoing is merely an example of an embodiment of the present disclosure and is not intended to limit the embodiment of the present disclosure. Various modifications and variations of the illustrative embodiments will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the embodiments of the present specification, should be included in the scope of the claims of the embodiments of the present specification.
Claims (11)
1. The utility model provides a distribution network fault analysis method including distributed photovoltaic access which is characterized in that the method includes:
performing fault simulation at a fault point through a fault unit;
determining a short-circuit current of a fault unit with a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
determining a short-circuit current of a fault unit with a two-phase fault located upstream of the load as a second short-circuit current; the total circuit breaker, the load and the fault unit are all located in a power distribution network with distributed photovoltaic access;
determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and a protection fixed value;
and adjusting the protection fixed value according to the overcurrent protection sensitivity.
2. The method for analyzing faults of a power distribution network including distributed photovoltaic access according to claim 1, wherein the protection constant comprises a first protection constant and a second protection constant;
Determining the overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection constant value comprises:
determining a first overcurrent protection sensitivity according to the first short-circuit current and the first protection value;
and determining a second overcurrent protection sensitivity according to the second short-circuit current and the second protection fixed value.
3. The method for fault analysis of a power distribution network including distributed photovoltaic access of claim 2, wherein adjusting the protection setpoint according to the overcurrent protection sensitivity comprises:
adjusting the first protection value according to the comparison result of the first overcurrent protection sensitivity and the first sensitivity threshold;
and adjusting the second protection fixed value according to the comparison result of the second overcurrent protection sensitivity and the second sensitivity threshold.
4. The method for analyzing faults in a power distribution network including distributed photovoltaic access of claim 1, further comprising:
opening a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and collecting the current and the voltage of the total circuit breaker and the current and the voltage of the fault point after the breaking circuit breaker is opened;
closing the breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and collecting the current and the voltage of the total circuit breaker and the current and the voltage of the fault point after the breaking circuit breaker is closed;
And determining a fault change index according to the current and the voltage of the total circuit breaker after the breaking circuit breaker is opened, the current and the voltage of the fault point and the current and the voltage of the total circuit breaker after the breaking circuit breaker is closed.
5. A power distribution network fault analysis device including distributed photovoltaic access, comprising:
the fault simulation module is used for performing fault simulation on the fault point through the fault unit;
a first short-circuit current module for determining a short-circuit current of a fault unit having a three-phase fault located downstream of the total circuit breaker as a first short-circuit current;
the second short-circuit current module is used for determining the short-circuit current of the fault unit with the two-phase fault, which is positioned at the upstream of the load, as the second short-circuit current; the total circuit breaker, the load and the fault unit are all located in a power distribution network with distributed photovoltaic access;
the overcurrent protection sensitivity module is used for determining overcurrent protection sensitivity according to the first short-circuit current, the second short-circuit current and the protection fixed value;
and the protection fixed value adjusting module is used for adjusting the protection fixed value according to the overcurrent protection sensitivity.
6. The power distribution network fault analysis apparatus with distributed photovoltaic access of claim 5, wherein the protection constant comprises a first protection constant and a second protection constant;
the overcurrent protection sensitivity module includes:
a first overcurrent protection sensitivity unit configured to determine a first overcurrent protection sensitivity according to the first short-circuit current and the first protection value;
and the second overcurrent protection sensitivity unit is used for determining a second overcurrent protection sensitivity according to the second short-circuit current and the second protection fixed value.
7. The power distribution network fault analysis apparatus with distributed photovoltaic access of claim 6, wherein the protection constant adjustment module comprises:
a first protection value adjusting unit for adjusting the first protection value according to a comparison result of the first overcurrent protection sensitivity and a first sensitivity threshold;
and the second protection fixed value adjusting unit is used for adjusting the second protection fixed value according to the comparison result of the second overcurrent protection sensitivity and the second sensitivity threshold.
8. The power distribution network fault analysis apparatus with distributed photovoltaic access of claim 5, further comprising:
The first acquisition module is used for opening a breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and acquiring the current and the voltage of the total circuit breaker and the current and the voltage of the fault point after the breaking circuit breaker is opened;
the second acquisition module is used for closing the breaking circuit breaker which is positioned on the same line with the distributed photovoltaic, and acquiring the current and the voltage of the total circuit breaker and the current and the voltage of the fault point after the breaking circuit breaker is closed;
the fault change index module is used for determining a fault change index according to the current and the voltage of the total circuit breaker after the breaking circuit breaker is opened, the current and the voltage of the fault point, the current and the voltage of the total circuit breaker after the breaking circuit breaker is closed, and the current and the voltage of the fault point.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and running on the processor, characterized in that the processor implements the steps of the method for analyzing faults in a power distribution network comprising distributed photovoltaic access according to any of claims 1 to 4 when the computer program is executed.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the power distribution network fault analysis method comprising distributed photovoltaic access of any of claims 1 to 4.
11. A computer program product comprising computer programs/instructions which, when executed by a processor, implement the steps of the method for failure analysis of a power distribution network comprising distributed photovoltaic access according to any of claims 1 to 4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117310384A (en) * | 2023-11-02 | 2023-12-29 | 国网河北省电力有限公司电力科学研究院 | Method and device for analyzing fault area in intelligent power distribution network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117310384A (en) * | 2023-11-02 | 2023-12-29 | 国网河北省电力有限公司电力科学研究院 | Method and device for analyzing fault area in intelligent power distribution network |
| CN117310384B (en) * | 2023-11-02 | 2024-05-28 | 国网河北省电力有限公司电力科学研究院 | Method and device for analyzing fault area in intelligent power distribution network |
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