CN114462175A - Power supply reliability calculation method and device considering low-voltage transfer - Google Patents
Power supply reliability calculation method and device considering low-voltage transfer Download PDFInfo
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- CN114462175A CN114462175A CN202210137925.5A CN202210137925A CN114462175A CN 114462175 A CN114462175 A CN 114462175A CN 202210137925 A CN202210137925 A CN 202210137925A CN 114462175 A CN114462175 A CN 114462175A
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Abstract
The invention relates to a method and equipment for calculating power supply reliability considering low-voltage transfer, wherein the method comprises the following steps of: acquiring real-time basic data and operation data of the low-voltage transformer area, and acquiring fault information of equipment in each low-voltage transformer area; calculating power supply reliability parameters according to the equipment type; carrying out topology analysis based on actual operation grid topology data and ledger data of low-voltage transformer area equipment to find out a low-voltage interconnection switch and the position of the low-voltage interconnection switch in the low-voltage transformer area; determining a feasible load transfer path by combining the standing book data and the operation data; and calculating the power supply reliability based on the position of the feasible load transfer path. Compared with the prior art, the method has the advantages of accurately reflecting the power supply reliability and the like.
Description
Technical Field
The invention relates to the field of evaluation and analysis of power supply reliability of a power grid, in particular to a power supply reliability calculation method and equipment considering low-voltage power transfer.
Background
The power grid is an important component of a power system, the power supply reliability of the power grid has an important influence on the stability of the development of the power industry, and the reliability, the safety and the stability of the power consumption of users are directly related. With the continuous increase of social electricity consumption, the load borne by the power grid is larger and larger, the probability of overload operation of the power grid is greatly increased, regional power failure caused by power grid faults is increased, and the power supply reliability of the power grid is influenced. Therefore, the effectiveness and the accuracy of the power grid power supply reliability calculation and evaluation become the more concerned problems of the power enterprises.
The low-voltage transformer area is an important component in a power grid and is also a place for directly reflecting the power supply reliability, and along with the attention of power enterprises to the power supply reliability, the low-voltage contact for guaranteeing the power supply of users is more and more. At present, the power supply reliability evaluation process is mostly a distribution transformer from a substation outlet to the tail end of a distribution line, the considered influence factors are not comprehensive, and the power supply reliability of an actual operation power grid cannot be accurately reflected.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method and equipment for calculating the power supply reliability considering low-voltage transfer supply, which can accurately reflect the power supply reliability.
The purpose of the invention can be realized by the following technical scheme:
a power supply reliability calculation method considering low-voltage transfer supply comprises the following steps:
acquiring real-time basic data and operation data of a low-voltage transformer area, wherein the basic data comprises actual operation grid topology data and account data of low-voltage transformer area equipment;
acquiring fault information of each low-voltage transformer area device;
calculating power supply reliability parameters according to the equipment type based on the ledger data and the fault information;
performing topology analysis based on actual operation grid topology data and ledger data of the low-voltage transformer area equipment to find a low-voltage interconnection switch and the position of the low-voltage interconnection switch in the low-voltage transformer area;
determining a feasible load transfer path by combining the ledger data and the operation data based on the position of the low-voltage interconnection switch in a low-voltage area;
and calculating the power supply reliability based on the position of the feasible load transfer path, specifically: if the feasible load transfer path is positioned at the head end of the transformer area, the low-voltage transfer equipment is equivalent to an opposite side distribution transformer, and the reliability parameters use the parameters of the opposite side distribution transformer to calculate the power supply reliability; and if the low-voltage power transfer path is positioned at the tail end of the distribution room, the interconnection switch is equivalent to low-voltage distribution room tail end equipment, and the reliability parameters use the parameters of the opposite low-voltage distribution room tail end equipment to calculate the power supply reliability.
Further, the low-voltage transformer area equipment comprises a distribution transformer, a pole-mounted transformer, an overhead line, a cable section, a circuit breaker, an isolating switch, a load switch and a low-voltage user.
Further, the operation data comprises active power, reactive power and power factor of the head end of the transformer area and electric quantity data of the end user of the transformer area.
Further, the fault information includes a fault device name, a fault device id, a fault occurrence time, a fault duration, and a fault affecting user number.
Further, the power supply reliability parameters include a device failure rate and a device failure repair time.
Further, the finding of the low-voltage interconnection switch specifically includes:
analyzing switch information based on actual operation grid topology data, decomposing each switch into a common switch, analyzing a normally open switch into a suspected interconnection switch according to whether the switch is normally open, and analyzing an disconnected switch into a suspected interconnection switch according to the actual opening and closing state of the switch;
and analyzing the suspected interconnection switches, wherein if the same switch belongs to different low-voltage transformer districts, the switch is an interconnection switch, and otherwise, the switch is a common switch.
Further, the feasible load transfer path satisfies the following conditions: the interconnection switch does not have the line load too high or user's power consumption can not satisfy in the load switching process.
Further, when power supply reliability is calculated, low-voltage distribution area equipment parameters, network frame topology and equipment coordinate information are integrated, a low-voltage distribution area actual operation diagram is constructed, and the final power supply reliability is calculated and obtained by combining the low-voltage distribution area real-time operation data and the power supply reliability parameters of the low-voltage distribution area equipment.
Further, the method further comprises:
and displaying the result of the power supply reliability calculation.
The present invention also provides an electronic device comprising:
one or more processors;
a memory; and
one or more programs stored in the memory, the one or more programs including instructions for performing the power reliability calculation method as described above.
Compared with the prior art, the invention has the following beneficial effects:
1. the method is based on a virtual modeling technology, utilizes the net rack topological data, the equipment ledger data and the real-time operation data of the actual operation of the low-voltage distribution area in the power grid to construct a power supply reliability evaluation model of the low-voltage distribution area, carries out power supply reliability calculation considering low-voltage power conversion, and can reflect the power supply reliability of the actual operation power grid more practically.
2. The invention considers the feasibility and different positions of the low-voltage power supply transfer path, performs low-voltage communication equivalence and can obtain a more reliable power supply reliability calculation result.
Drawings
FIG. 1 is a schematic flow diagram of the process of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the present embodiment provides a method for calculating power supply reliability considering low voltage transfer, including the following steps:
and S101, accessing data of the low-voltage transformer area.
And accessing basic data and operating data of the low-voltage transformer area equipment in real time through the middle transformer interface. Wherein, low pressure platform district equipment includes distribution transformer, pole-mounted transformer, overhead line, cable section, circuit breaker, isolator, load switch, low pressure user etc. and basic data includes access equipment rack topology data and equipment ledger data of actual operation, and the operation data includes platform district head end active power, reactive power, power factor etc. and platform district end user electric quantity data.
And S102, accessing equipment fault data.
And accessing the fault data of the equipment in the low-voltage transformer area through a fault system interface of the power distribution network terminal. The fault data comprises data such as fault equipment names, fault equipment ids, fault occurrence time, fault duration, fault influence user number and the like, and is divided into real-time fault information and historical fault information.
And S103, calculating equipment reliability parameters.
And calculating power supply reliability parameters according to the equipment type by combining the equipment account data and the equipment fault information of the low-voltage distribution area, and calculating the equipment fault rate and the equipment fault repair time of various equipment.
The specific calculation formula is as follows: the overhead line fault rate is the total number of overhead line faults times 100 km/total overhead line length, and the unit is (times/hundred kilometers per year); the cable segment failure rate is the total number of the cable segment failures (100 km/total length of the cable segment) and the unit is (times/hundred kilometers/year); the transformer fault rate is the total number of transformer faults/the total number of transformers, and the unit is (times/year); the failure rate of the circuit breaker is the total number of failures of the circuit breaker/the total number of the circuit breakers, and the unit is (times/year); the load switch failure rate is the total number of load switch failures/the total number of load switches, and the unit is (times/year); the failure rate of the disconnecting switch is the total number of times of the failures of the disconnecting switch/the total number of the disconnecting switches, and the unit is (times/year); equipment fault repairing time the fault repairing time is the average annual fault repairing time of various types of equipment.
And S104, identifying the low-voltage transformer area interconnection switch through topology analysis.
Rely on access to equipment rack topology data and equipment standing book data, carry out topology analysis, whether belong to different districts through judging that there is same switch and carry out the liaison switch and discern, judge that low pressure district switch is liaison switch or ordinary switch, specifically:
the switch information is analyzed, and the switches are divided into ordinary switches (circuit breakers, load switches and the like), T-shaped switches, V-shaped switches and three-position load switches according to different switch types. The T-shaped switch, the V-shaped switch and the three-position load switch are disassembled according to the switch component through data analysis, and the disassembled component is used as a common switch for analysis. And judging whether the switch is a normally open switch according to the switch information, analyzing the normally open switch as a suspected interconnection switch, and otherwise, analyzing the normally open switch as a breaking switch. According to the actual opening and closing state of the switch, the opened switch is analyzed as a suspected interconnection switch, and the closed switch is analyzed as a breaking switch. And then analyzing a suspected interconnection switch, wherein if the same switch belongs to different low-voltage transformer districts, the switch is the interconnection switch, and otherwise, the switch is the common switch.
And analyzing the interconnection switches in the low-voltage transformer area through the logic.
And S105, analyzing the position of the interconnection switch.
And determining the position of the low-voltage contact switch in the distribution area by means of topology analysis by combining the low-voltage contact switch identification data analyzed in the previous step according to the access equipment network frame topology data and the equipment ledger data.
And S106, carrying out load transfer analysis.
And determining the position of the low-voltage interconnection switch in the transformer area according to the previous step, analyzing a load transfer path by combining equipment account data and real-time operation data, judging whether the interconnection switch has the conditions of overhigh line load or incapability of meeting the power consumption of a user and the like in the load transfer process, if so, indicating that the interconnection switch transfer condition is not met, and ensuring the reliability of the load transfer process because the transfer path of the interconnection switch is not a feasible path.
And S107, selecting a low-voltage transfer path.
And on the basis of the analysis of the load transfer path, selecting a low-voltage transfer path and performing low-voltage communication equivalence. If the low voltage transfer path is located at the head end of the platform area, step S108 is executed, and if the low voltage transfer path is located at the tail end of the platform area, step S109 is executed.
And S108, equating the low-voltage power transfer equipment to be an opposite-side distribution transformer, using the reliability parameter of the opposite-side distribution transformer, and executing the step S110.
And S109, equating the interconnection switch as low-voltage station area end equipment, using the reliability parameter as the opposite low-voltage station area end equipment parameter, and then executing the step S110.
And S110, calculating the power supply reliability to obtain a reliability calculation result.
In this embodiment, the existing reliability analysis and evaluation software is relied on, the low-voltage distribution room equipment parameters, the network frame topology and the equipment coordinate information are integrated, the low-voltage distribution room actual operation diagram is constructed, and the power supply reliability calculation is performed by combining the low-voltage distribution room real-time operation data information and the reliability parameters of the low-voltage distribution room equipment.
And S111, displaying a calculation result. And automatically generating a real-time low-voltage transformer area operation diagram by analyzing the equipment information, the network frame topology and the equipment coordinate information.
Based on a virtual modeling technology, a low-voltage distribution area power supply reliability evaluation model is constructed by utilizing net rack topological data, equipment account data and real-time operation data of actual operation of a low-voltage distribution area in a power grid, and power supply reliability calculation considering low-voltage power conversion is carried out, so that the conventional power supply reliability calculation method is perfected, and the power supply reliability of the actual operation power grid is reflected more practically.
The method is based on a virtual modeling technology, a low-voltage distribution area power supply reliability evaluation model is constructed by utilizing net rack topological data, equipment account data and real-time operation data of actual operation of a low-voltage distribution area in the power grid, and power supply reliability calculation considering low-voltage power conversion is carried out, so that the existing power supply reliability calculation method is perfected, and the power supply reliability of the actual operation power grid is reflected more practically.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection determined by the claims.
Claims (10)
1. A power supply reliability calculation method considering low-voltage transfer is characterized by comprising the following steps:
acquiring real-time basic data and operation data of a low-voltage transformer area, wherein the basic data comprises actual operation grid topology data and account data of low-voltage transformer area equipment;
acquiring fault information of each low-voltage transformer area device;
calculating power supply reliability parameters according to the equipment type based on the ledger data and the fault information;
performing topology analysis based on actual operation grid topology data and ledger data of the low-voltage transformer area equipment to find a low-voltage interconnection switch and the position of the low-voltage interconnection switch in the low-voltage transformer area;
determining a feasible load transfer path by combining the ledger data and the operation data based on the position of the low-voltage interconnection switch in a low-voltage area;
and calculating the power supply reliability based on the position of the feasible load transfer path, specifically: if the feasible load transfer path is positioned at the head end of the transformer area, the low-voltage transfer equipment is equivalent to an opposite side distribution transformer, and the reliability parameters use the parameters of the opposite side distribution transformer to calculate the power supply reliability; and if the low-voltage power supply transfer path is positioned at the tail end of the transformer area, the interconnection switch is equivalent to low-voltage transformer area tail end equipment, and the reliability parameter uses the parameter of the opposite low-voltage transformer area tail end equipment to calculate the power supply reliability.
2. The method of claim 1, wherein the low voltage transformer area equipment comprises distribution transformers, pole transformers, overhead lines, cable sections, circuit breakers, disconnectors, load switches, and low voltage users.
3. The method of claim 1, wherein the operational data includes active power at a head end of the cell, reactive power and power factor, and end user power data.
4. The method according to claim 1, wherein the fault information includes a fault device name, a fault device id, a fault occurrence time, a fault duration, and a fault affecting user number.
5. The method according to claim 1, wherein the power supply reliability parameters include a device failure rate and a device failure recovery time.
6. The method for calculating power supply reliability considering low-voltage switching according to claim 1, wherein the finding of the low-voltage interconnection switch specifically comprises:
analyzing switch information based on actual operation grid topology data, decomposing each switch into a common switch, analyzing a normally open switch into a suspected interconnection switch according to whether the switch is normally open, and analyzing an disconnected switch into a suspected interconnection switch according to the actual opening and closing state of the switch;
and analyzing the suspected interconnection switch, wherein if the same switch belongs to different low-voltage transformer areas, the switch is an interconnection switch, and otherwise, the switch is a common switch.
7. The method according to claim 1, wherein the feasible load transfer path satisfies the following condition: the interconnection switch does not have the line load too high or user's power consumption can not satisfy in the load switching process.
8. The method for calculating the power supply reliability considering the low voltage switching power supply as claimed in claim 1, wherein in the power supply reliability calculation, the low voltage distribution area device parameters, the network frame topology and the device coordinate information are integrated to construct a low voltage distribution area actual operation diagram, and the final power supply reliability is calculated and obtained by combining the low voltage distribution area real-time operation data and the power supply reliability parameters of the low voltage distribution area devices.
9. The method for calculating power supply reliability considering low voltage transfer according to claim 1, further comprising:
and displaying the result of the power supply reliability calculation.
10. An electronic device, comprising:
one or more processors;
a memory; and
one or more programs stored in the memory, the one or more programs including instructions for performing the power reliability calculation method of any of claims 1-9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115796459A (en) * | 2023-02-08 | 2023-03-14 | 佰聆数据股份有限公司 | Low-voltage transformer area voltage quality analysis method and device based on multi-source data |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115796459A (en) * | 2023-02-08 | 2023-03-14 | 佰聆数据股份有限公司 | Low-voltage transformer area voltage quality analysis method and device based on multi-source data |
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