CN116094179A - AC/DC flexible distribution network medium-voltage line fault analysis processing system - Google Patents

AC/DC flexible distribution network medium-voltage line fault analysis processing system Download PDF

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CN116094179A
CN116094179A CN202310380993.9A CN202310380993A CN116094179A CN 116094179 A CN116094179 A CN 116094179A CN 202310380993 A CN202310380993 A CN 202310380993A CN 116094179 A CN116094179 A CN 116094179A
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power generation
target medium
voltage line
transmission line
power transmission
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CN116094179B (en
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阮祥勇
毛德拥
周章斌
周远科
戚振彪
曹涛
洪剑峰
黄辉
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Hefei Power Supply Co of State Grid Anhui Electric Power Co Ltd
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Hefei Power Supply Co of State Grid Anhui Electric Power Co Ltd
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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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00—Measuring or testing not otherwise provided for
    • G01D21/02—Measuring two or more variables by means not covered by a single other subclass
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
    • 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
    • H02J3/02—Circuit arrangements for ac mains or ac distribution networks using a single network for simultaneous distribution of power at different frequencies; using a single network for simultaneous distribution of ac power and of dc power
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
    • H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The invention relates to the technical field of power grid fault analysis, in particular to an AC/DC flexible distribution network medium-voltage line fault analysis processing system, which comprises a photovoltaic power generation group monitoring and analysis module, wherein the photovoltaic power generation group monitoring and analysis module is used for monitoring and analyzing the power generation condition of each photovoltaic power generation group in a target medium-voltage line, and the photovoltaic power generation group monitoring and analysis module specifically comprises a power generation environment monitoring unit, a power generation environment analysis unit, a power generation data monitoring end and a power generation data analysis unit. According to the system, through fault analysis on the power generation side and the power transmission side of the medium-voltage circuit of the AC/DC flexible distribution network, the possible problems of the medium-voltage circuit in the operation process are more comprehensively screened out, and each faulty position is positioned, so that workers can conveniently analyze and examine the faulty position.

Description

AC/DC flexible distribution network medium-voltage line fault analysis processing system
Technical Field
The invention relates to the technical field of power grid fault analysis, in particular to an AC/DC flexible distribution network medium-voltage line fault analysis processing system.
Background
The flexible transformer substation is used for carrying out high-efficiency conversion on different types of voltage and current at a wind power monitoring end, and receiving and distributing electric energy in a flexible and controllable plug-and-play mode. The flexible interface mainly has the characteristics of power frequency alternating current, direct current, even non-power frequency, low-frequency power transmission flexible interface, flexible control capability, fault isolation and quick recovery function, one station with multiple functions and the like. The AC/DC hybrid power distribution network not only maintains the advantages of mature technology of the existing AC power distribution mode, but also has the same excellent performance as the DC power distribution mode in the aspects of control flexibility, line transport capacity and the like, thereby having stronger power supply reliability and distributed power supply digestion capability.
In the running process of the alternating current-direct current flexible distribution network medium-voltage line, because the access points on the power generation side are too many, the hidden trouble of generating faults is large, and the power transmission line of the alternating current-direct current flexible distribution network medium-voltage line also has faults to cause the loss of large electric quantity of the distribution network, so that the alternating current-direct current flexible distribution network medium-voltage line needs to be regularly arranged for workers to carry out inspection on the power generation side and the power transmission side in daily maintenance work.
The fault condition of the AC/DC flexible distribution network can be analyzed by adopting a mode of monitoring the current of the total incoming line, the analysis mode is on one side, whether the AC/DC flexible distribution network has faults or not can not be judged according to the actual environment condition of the photovoltaic power generation group, and the position of the faults on the power generation side in the AC/DC flexible distribution network can not be intuitively reflected, so that the inspection pertinence is poor, and the area of the photovoltaic power generation side is larger, so that the inspection efficiency of the AC/DC flexible distribution network is further reduced; in addition, when the power transmission line of the alternating current/direct current flexible distribution network is inspected, only some problems outside the power transmission line can be found, and the actual fault condition and degree of the power transmission line can not be analyzed.
Disclosure of Invention
The invention solves the technical problems, and adopts the following technical scheme: the utility model provides a flexible distribution network medium voltage line fault analysis processing system of alternating current-direct current, includes photovoltaic power generation group monitoring analysis module, photovoltaic power generation group monitoring analysis module is used for monitoring and analyzing the power generation condition of each photovoltaic power generation group in the target medium voltage line, specifically includes:
the power generation environment monitoring unit is used for monitoring the natural environment within a preset time period of the photovoltaic power generation group in the target medium-voltage line to obtain environment influence parameters of the photovoltaic power generation group in the target medium-voltage line;
the power generation environment analysis unit is used for analyzing and obtaining rated power generation capacity of each photovoltaic power generation group in the target medium-voltage circuit according to the environmental influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit;
the power generation data monitoring end is used for collecting power generation data of all the photovoltaic inverters in the target medium-voltage circuit so as to obtain total actual power generation capacity of the photovoltaic power generation group corresponding to all the photovoltaic inverters in the target medium-voltage circuit;
the power generation data analysis unit is used for analyzing and obtaining the power generation failure rate of the target medium-voltage circuit according to the rated power generation amount of the photovoltaic power generation group in the target medium-voltage circuit and the total actual power generation amount of the photovoltaic power generation group corresponding to each photovoltaic inverter;
the system for analyzing and processing faults of the medium-voltage line of the alternating-current and direct-current flexible distribution network further comprises a power transmission monitoring and analyzing module, a medium-voltage line database and a medium-voltage line display module, wherein the power transmission monitoring and analyzing module is used for monitoring and analyzing each node of the power transmission line in the target medium-voltage line, and the power transmission monitoring and analyzing module comprises:
the video monitoring terminal is used for carrying out video monitoring on the power transmission line corresponding to each node of the power transmission line in the target medium voltage line to obtain video monitoring data of the target medium voltage line;
the wind power monitoring end is used for monitoring wind power and wind direction of each node of the power transmission line in the target medium voltage line to obtain wind power and wind direction data of the target medium voltage line;
the sensor monitoring end is used for monitoring the cable tension of each node of the power transmission line in the target medium voltage line to obtain cable tension data of the target medium voltage line;
the power transmission analysis unit is used for respectively analyzing and obtaining covering influence coefficients, wind influence coefficients and tension influence coefficients of all nodes of the power transmission line in the target medium voltage line according to video monitoring data, wind force and wind direction data and cable tension data of the target medium voltage line, so as to obtain fault rates of all nodes of the power transmission of the target medium voltage line;
the medium voltage line database is used for storing the types corresponding to the photovoltaic power generation groups in the target medium voltage line and the power generation curves of the photovoltaic power generation groups in different types, the power generation loss rate of the photovoltaic power generation groups in the target medium voltage line, the safety area of ice coating and the safety area of rainwater coating and the safety area of sundries coating of the power transmission line in the target medium voltage line, the laying direction of the cable in the target medium voltage line, the maximum safe wind power of the power transmission line in the target medium voltage line and the standard tension of the power transmission line cable in the target medium voltage line;
the medium voltage line display module is used for displaying the power generation failure rate and the power transmission failure rate of the target medium voltage line and positioning the specific position of the target medium voltage line, which needs to be subjected to failure processing.
Furthermore, the power generation environment monitoring unit detects the illumination intensity and the environment temperature in a preset time period of the target medium voltage circuit through a power generation environment monitoring end, so as to obtain the environment influence parameters of the photovoltaic power generation group in the target medium voltage circuit, wherein the power generation environment monitoring end is an illumination sensor.
Further, the analysis mode of the power generation environment analysis unit is as follows: and the environmental influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit are acquired and are brought into the power generation curves of the photovoltaic power generation groups with the corresponding types of the medium-voltage circuit database, so that rated power generation amount of each photovoltaic power generation group in the target medium-voltage circuit is obtained.
Further, the specific analysis mode of the power generation data analysis unit is as follows:
the method comprises the steps of firstly, collecting current of a total inlet wire end of each photovoltaic inverter of a target medium voltage circuit in a preset time through a power generation data monitoring end, multiplying each value of the total inlet wire end current of each photovoltaic inverter of the target medium voltage circuit in the preset time by a corresponding duration, superposing the values, further obtaining total actual power generation amount of a photovoltaic power generation group corresponding to each photovoltaic inverter in the target medium voltage circuit, and recording the total actual power generation amount as the total actual power generation amount of the photovoltaic power generation group corresponding to each photovoltaic inverter in the target medium voltage circuit
Figure SMS_1
H represents the h photovoltaic inverter in the target medium voltage line, h=1, 2, …, k;
step two, the rated power generation amount of each photovoltaic power generation group in the target medium-voltage circuit and the total actual power generation amount of the photovoltaic power generation groups corresponding to the photovoltaic inverters are brought into a formula
Figure SMS_2
Further, the power generation failure rate of the target medium voltage line is obtained and is recorded as +.>
Figure SMS_3
Wherein->
Figure SMS_4
The rated power generation amount of the f photovoltaic power generation group corresponding to the h photovoltaic inverter in the preset time is represented, and f=1, 2, … and j; />
Figure SMS_5
The power generation loss rate of the photovoltaic power generation group is represented.
Further, the specific monitoring analysis mode of the power transmission analysis unit is as follows:
s10, performing image acquisition on the power transmission line corresponding to each node of the power transmission line in the target medium voltage line through a video monitoring end of the node, and comparing the image gray scale to the power transmission line corresponding to the nodeAnalyzing the type and area of the covering of the transmission line to obtain the covering influence coefficient of each node of the transmission line in the target medium-voltage line, and recording the covering influence coefficient as
Figure SMS_7
M represents an mth node of the power transmission line in the target medium voltage line, m=1, 2, … and r, and a calculation formula of the covering influence coefficient of each node of the power transmission line in the target medium voltage line is as follows: />
Figure SMS_9
Wherein b1, b2 and b3 respectively represent a preset correction coefficient of ice for the cover, a correction coefficient of rainwater for the cover and a correction coefficient of sundries for the cover; />
Figure SMS_11
、/>
Figure SMS_8
、/>
Figure SMS_10
Respectively representing the ice-covered area, the rainwater-covered area and the sundry-covered area of the mth node of the power transmission line in the target medium-voltage line; />
Figure SMS_12
、/>
Figure SMS_13
、/>
Figure SMS_6
The safety area of the ice coating of the power transmission line, the safety area of the rainwater coating and the safety area of the sundries coating are respectively represented, and e represents a constant;
s20, monitoring wind power and wind direction of each node of the power transmission line in the target medium voltage line through a wind power monitoring end, further obtaining wind power and wind direction of each node of the power transmission line in the target medium voltage line, obtaining an included angle between wind direction of each node of the power transmission line in the target medium voltage line and the cable laying direction through reading the cable laying direction in the target medium voltage line, and recording the included angle as
Figure SMS_14
Simultaneously, the wind power of each node of the transmission line in the target medium voltage line is recorded as +.>
Figure SMS_15
The included angle between the wind direction of each node of the power transmission line and the cable laying direction in the target medium-voltage line is brought into the formula +.>
Figure SMS_16
Further obtaining the wind power influence coefficient of each node of the transmission line in the target medium voltage line, and marking the wind power influence coefficient as +.>
Figure SMS_17
，/>
Figure SMS_18
Representing the maximum safe wind power of the power transmission line in the target medium-voltage line;
s30, monitoring the cable tension of each node of the transmission line in the target medium voltage line through a sensor monitoring end to obtain the tension value of each node cable of the transmission line in the target medium voltage line, and recording the tension value as
Figure SMS_19
Further calculating and obtaining the tension influence coefficient of each node of the transmission line in the target medium-voltage line, and marking the tension influence coefficient as +.>
Figure SMS_20
The calculation formula of the tension influence coefficient of each node of the transmission line in the target medium voltage line is +.>
Figure SMS_21
Wherein->
Figure SMS_22
Representing the tension value of the power transmission line m-1 node cable in the target medium voltage line,/->
Figure SMS_23
Representing the tension value of the (m+1) th node cable of the transmission line in the target medium-voltage line; />
Figure SMS_24
Representing a standard tension of a transmission line cable in the target medium voltage line;
s40, analyzing the covering influence coefficient of each node of the power transmission line, the wind force influence coefficient of each node of the power transmission line and the tension influence coefficient of each node cable of the power transmission line in the target medium voltage line to obtain the fault rate of each node of the power transmission line of the target medium voltage line.
Further, the calculation formula of the failure rate of each node of the target medium voltage line power transmission is as follows
Figure SMS_25
，/>
Figure SMS_26
、/>
Figure SMS_27
Correction factors respectively representing wind power influence coefficients and covering influence coefficients in set transmission lines, < ->
Figure SMS_28
、/>
Figure SMS_29
、/>
Figure SMS_30
Respectively represent the weight ratio of the tension force influence coefficient of the power transmission line node cable, the weight ratio of the wind force influence coefficient of the power transmission line node, the weight ratio of the covering influence coefficient in the medium voltage line, and->
Figure SMS_31
。
Further, the medium voltage circuit display module receives the power generation failure rate of the target medium voltage circuit, if the power generation failure rate is greater than the preset power generation failure rate of the medium voltage circuit, the fault detection is required to be performed on each photovoltaic inverter so as to screen one or more photovoltaic inverters with faults, and the selected photovoltaic inverters with faults and each photovoltaic power generation group corresponding to the selected photovoltaic inverters are subjected to inspection and detection.
Further, the medium voltage line display module counts the fault rate of each node of the target medium voltage line power transmission line, screens each node of the power transmission line with the fault rate larger than the preset fault rate, marks the node as a key inspection node of the power transmission line, and inspects and overhauls the key inspection node of the power transmission line.
The AC/DC flexible distribution network medium-voltage line fault analysis processing system has the following beneficial effects:
1. according to the system, through fault analysis on the power generation side and the power transmission side of the AC/DC flexible distribution network medium-voltage line, the possible problems of the medium-voltage line in the operation process are more comprehensively screened, the faulty positions are positioned, workers can conveniently analyze and examine the faulty positions, and the fault analysis on the AC/DC flexible distribution network medium-voltage line by the system can be increased through a plurality of dimension analysis modes.
2. The system acquires the environmental parameters of the photovoltaic power generation group and the input current of the photovoltaic inverter, so as to obtain the power generation fault condition of the target medium voltage line, and objectively reflects the power generation fault condition of the target medium voltage line on the basis of the actual power generation condition of the reference photovoltaic power generation group.
3. The system positions the fault inverter when the target medium-voltage circuit fails and determines the fault photovoltaic power generation group corresponding to the fault inverter, so that the fault inverter and the branch of the fault photovoltaic power generation group corresponding to the fault inverter can be inspected and overhauled manually, and the daily comprehensive inspection workload is greatly reduced.
4. The system can objectively and comprehensively reflect faults existing in the power transmission line through covering influence coefficients, wind force influence coefficients and tension force influence coefficients of all nodes of the power transmission line, and reflect the severity of the faults through numerical values of the coefficients.
5. The system can monitor the fault rate of each node of the power transmission line of the AC/DC flexible distribution network in real time, and further screen each node of the power transmission line which is larger than the preset fault rate in severe weather environment, and perform key investigation and maintenance on the node.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
Fig. 1 is a schematic diagram of connection between each module of a fault analysis processing system of a medium-voltage line in an ac/dc flexible distribution network.
Fig. 2 is a block diagram of a photovoltaic power generation group monitoring analysis module in the ac/dc flexible distribution network medium-voltage line fault analysis processing system.
Fig. 3 is a block diagram of a power transmission monitoring analysis module in the fault analysis processing system of the ac/dc flexible distribution network.
Detailed Description
Embodiments of the present invention are described in detail below. The following examples are illustrative only and are not to be construed as limiting the invention. The examples are not to be construed as limiting the specific techniques or conditions described in the literature in this field or as per the specifications of the product.
Referring to fig. 1-3, a fault analysis processing system for an ac/dc flexible distribution network medium voltage line includes a photovoltaic power generation group monitoring and analysis module, where the photovoltaic power generation group monitoring and analysis module is configured to monitor and analyze power generation conditions of each photovoltaic power generation group in a target medium voltage line, and the photovoltaic power generation group monitoring and analysis module specifically includes a power generation environment monitoring unit, a power generation environment analysis unit, a power generation data monitoring end, and a power generation data analysis unit; the system for analyzing and processing faults of the medium-voltage line of the alternating-current/direct-current flexible distribution network further comprises a power transmission monitoring and analyzing module, a medium-voltage line database and a medium-voltage line display module, wherein the power transmission monitoring and analyzing module is used for monitoring and analyzing each node of the power transmission line in the target medium-voltage line, and the medium-voltage line display module is used for displaying the power generation fault rate and the power transmission fault rate of the target medium-voltage line and positioning the specific position of the target medium-voltage line, which is required to be subjected to fault processing. It is understood that the target medium voltage line refers to a medium voltage line requiring line fault analysis. According to the system, the power generation condition of the photovoltaic power generation group in the target medium voltage line and the power transmission condition of the power transmission line are monitored and analyzed, whether the target medium voltage line has a fault or not is analyzed, the fault condition is displayed, the fault position can be positioned, and maintenance staff can conveniently maintain the fault place.
The medium voltage line database is used for storing the power generation curves of the photovoltaic power generation groups of different types and the power generation loss rate of the photovoltaic power generation groups in the target medium voltage line, wherein the models correspond to the photovoltaic power generation groups in the target medium voltage line.
The power generation data analysis unit in the photovoltaic power generation group monitoring analysis module is respectively connected with the power generation environment analysis unit and the power generation data monitoring end, and the power generation environment analysis unit is connected with the power generation environment monitoring unit. The medium-voltage line database is respectively connected with the medium-voltage line display module, the power transmission monitoring analysis module and the power generation data analysis unit, and the power transmission monitoring analysis module and the power generation data analysis unit are respectively connected with the medium-voltage line display module.
The power generation environment monitoring unit is used for monitoring the natural environment in a preset time period of the photovoltaic power generation group in the target medium-voltage circuit to obtain the environment influence parameters of the photovoltaic power generation group in the target medium-voltage circuit, and the illumination intensity and the temperature of the target medium-voltage circuit are not greatly different, so that only one group of power generation environment monitoring units is needed;
the power generation environment monitoring unit detects illumination intensity and environmental temperature in a preset time period of the target medium-voltage circuit through the power generation environment monitoring end, and then environment influence parameters of the photovoltaic power generation group in the target medium-voltage circuit are obtained, wherein the power generation environment monitoring end is an illumination sensor, the illumination sensor can collect temperature and illumination conditions corresponding to the position of the photovoltaic power generation group in the target medium-voltage circuit, and the illumination intensity and the temperature collected by the system are two most important parameters affecting the power generation capacity of the photovoltaic power generation plate. In actual operation, the illumination sensor is set to the same angle as the photovoltaic power generation panel, so that the light energy received by the illumination sensor is equal to the light energy received by the photovoltaic panel no matter how the angle between the photovoltaic power generation panel and the light rays changes.
The power generation environment analysis unit is used for analyzing and obtaining rated power generation capacity of each photovoltaic power generation group in the target medium-voltage circuit according to the environmental influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit;
the analysis mode of the power generation environment analysis unit is as follows: and the environmental influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit are acquired and are brought into the power generation curves of the photovoltaic power generation groups with the corresponding types of the medium-voltage circuit database, so that rated power generation amount of each photovoltaic power generation group in the target medium-voltage circuit is obtained.
The power generation amount of different photovoltaic panels is different under different illumination intensities, so that the illumination intensity is required to be brought into a corresponding photovoltaic panel power generation curve when the power generation amount of the photovoltaic panels is calculated, and then the calculated result is the rated power generation amount by multiplying the influence coefficient of temperature, and the photovoltaic panel power generation curve is a photovoltaic panel power generation curve constructed by taking the unit illumination intensity as a horizontal axis and the power generation amount of the photovoltaic panels as a vertical axis.
The power generation data monitoring end is used for collecting power generation data of all the photovoltaic inverters in the target medium-voltage circuit so as to obtain total actual power generation capacity of the photovoltaic power generation group corresponding to all the photovoltaic inverters in the target medium-voltage circuit; the power generation data analysis unit is used for analyzing and obtaining the power generation failure rate of the target medium voltage circuit according to the rated power generation amount of each photovoltaic power generation group in the target medium voltage circuit and the total actual power generation amount of the photovoltaic power generation groups corresponding to each photovoltaic inverter;
the specific analysis mode of the power generation data analysis unit is as follows:
the method comprises the steps of firstly, collecting current of a total inlet wire end of each photovoltaic inverter of a target medium voltage circuit in a preset time through a power generation data monitoring end, multiplying each value of the total inlet wire end current of each photovoltaic inverter of the target medium voltage circuit in the preset time by a corresponding duration, and superposing the values to obtain each photovoltaic inverter of the target medium voltage circuitThe total actual power generation of the corresponding photovoltaic power generation group is recorded as
Figure SMS_32
H represents the h photovoltaic inverter in the target medium voltage line, h=1, 2, …, k, and the position information of each photovoltaic inverter is stored in the medium voltage line database;
step two, the rated power generation amount of each photovoltaic power generation group in the target medium-voltage circuit and the total actual power generation amount of the photovoltaic power generation groups corresponding to the photovoltaic inverters are brought into a formula
Figure SMS_33
Further, the power generation failure rate of the target medium voltage line is obtained and is recorded as +.>
Figure SMS_34
Wherein->
Figure SMS_35
The rated power generation amount of the f photovoltaic power generation group corresponding to the h photovoltaic inverter in the preset time is represented, and f=1, 2, … and j; />
Figure SMS_36
The power generation loss rate of the photovoltaic power generation group is represented.
In the photovoltaic power generation, a plurality of photovoltaic power generation panels are connected in series to form a photovoltaic power generation group, and the photovoltaic power generation groups are connected in parallel to the photovoltaic inverter, so that rated power generation amount within preset time of each photovoltaic power generation group can be calculated through power generation curves of the corresponding type photovoltaic power generation groups and environment influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit, and therefore redundant description is omitted herein.
The medium voltage circuit display module is used for obtaining one or more failed photovoltaic inverters by receiving the power generation failure rate of the target medium voltage circuit and performing fault troubleshooting on each photovoltaic inverter if the power generation failure rate is greater than the power generation failure rate of the preset medium voltage circuit; the above-mentioned investigation mode is: by cutting off the input ends of each photovoltaic power generation group in each photovoltaic inverter one by one and cutting offGenerating fault rate and rated test fault rate of target medium voltage circuit after each photovoltaic inverter
Figure SMS_37
And comparing, if the power generation failure rate of the target medium voltage circuit after the input end of a certain photovoltaic power generation group of the photovoltaic inverter is cut off is within the range of the rated test failure rate, marking the photovoltaic inverter as a failure inverter, and carrying out inspection and maintenance on the corresponding photovoltaic power generation group on the failure inverter. The calculation formula of the rated test failure rate is as follows: />
Figure SMS_38
；/>
Figure SMS_39
A correction factor representing the rated test failure rate in the medium voltage line; />
Figure SMS_40
The (th) indicating the cut-off on the (h) th photovoltaic inverter>
Figure SMS_41
Rated power generation capacity within preset time of each photovoltaic power generation group, < > of>
Figure SMS_42
. The system acquires the environmental parameters of the photovoltaic power generation group and the input current of the photovoltaic inverter, so as to obtain the power generation fault condition in the target medium voltage line, and the analysis and measurement variables are fewer, so that the power generation fault condition of the target medium voltage line can be objectively reflected; in addition, the invention cuts off the electric quantity which does not greatly influence grid connection one by one through the input end of each photovoltaic power generation group in each photovoltaic inverter, thereby preventing the larger change of the electric quantity of grid connection of the photovoltaic from changing the alternating current and direct current flexiblyThe individual devices of the distribution network have an impact or even a reduced service life.
The power transmission monitoring and analyzing module comprises:
the video monitoring terminal is used for carrying out video monitoring on the power transmission line corresponding to each node of the power transmission line in the target medium voltage line to obtain video monitoring data of the target medium voltage line;
the wind power monitoring end is used for monitoring wind power and wind direction of each node of the power transmission line in the target medium voltage line to obtain wind power and wind direction data of the target medium voltage line;
the sensor monitoring end is used for monitoring the cable tension of each node of the power transmission line in the target medium voltage line to obtain cable tension data of the target medium voltage line;
the medium voltage line database also stores the ice-covered safety area and the rainwater-covered safety area of the power transmission line in the target medium voltage line, the sundry-covered safety area, the laying direction of the cable in the target medium voltage line, the maximum safe wind power of the power transmission line in the target medium voltage line and the standard tension of the power transmission line cable in the target medium voltage line; in addition, the medium voltage line database also stores the position information of each node of the transmission line in the target medium voltage line;
the power transmission analysis unit is used for respectively analyzing and obtaining covering influence coefficients, wind influence coefficients and tension influence coefficients of all nodes of the power transmission line in the target medium voltage line according to the video monitoring data, wind force and wind direction data and cable tension data of the target medium voltage line, so as to obtain the fault rate of all the nodes of the power transmission of the target medium voltage line. The system can objectively and comprehensively reflect faults existing in the power transmission line through covering influence coefficients, wind force influence coefficients and tension force influence coefficients of all nodes of the power transmission line, and reflect the severity of the faults through numerical values of the above coefficients, wherein the covering influence coefficients can reflect the conditions that the power transmission line possibly has ice coating, rainwater coating or covering, and analyze the influence degree of the covering on the cable according to the covering areas of the covering and the cable, and the covering on the cable can not only enable the potential hazards of skew and even dumping of the tower, but also cause tripping accidents; the wind power influence coefficient is used for analyzing the influence of wind power on the power transmission line, and the power transmission line is extremely easy to generate a jump fault under the influence of a storm environment; the tension influence coefficient is used to influence the loss of power transmission according to the tension of the cable.
The power transmission analysis unit in the power transmission monitoring analysis module is respectively connected with the video monitoring end, the wind power monitoring end and the sensor monitoring end, and the power transmission monitoring analysis module is respectively connected with the medium voltage line database and the medium voltage line display module through the power transmission analysis unit.
The specific monitoring analysis mode of the power transmission analysis unit is as follows:
s10, image acquisition is carried out on the power transmission line corresponding to each node of the power transmission line in the target medium voltage line through a video monitoring end of the node, the type and the area of the covering of the power transmission line corresponding to the node are analyzed through image gray scale comparison, and then the covering influence coefficient of each node of the power transmission line in the target medium voltage line is obtained and recorded as
Figure SMS_44
M represents an mth node of the power transmission line in the target medium voltage line, m=1, 2, … and r, and a calculation formula of the covering influence coefficient of each node of the power transmission line in the target medium voltage line is as follows: />
Figure SMS_47
Wherein b1, b2 and b3 respectively represent a preset correction coefficient of ice for the cover, a correction coefficient of rainwater for the cover and a correction coefficient of sundries for the cover; />
Figure SMS_49
、/>
Figure SMS_45
、/>
Figure SMS_46
Respectively representing the ice-covered area, the rainwater-covered area and the sundry-covered area of the mth node of the power transmission line in the target medium-voltage line; />
Figure SMS_48
、/>
Figure SMS_50
、/>
Figure SMS_43
The safety area of the ice coating of the power transmission line, the safety area of the rainwater coating and the safety area of the sundries coating are respectively represented, and e represents a constant; the coverings of sundries comprise bird nests, bird excretions, kites, plastic films, advertisement banners, metal wires, balloons and the like; the system refines the types of the covers, so that the influence of different covers on the power transmission line can be comprehensively changed, and further the influence condition of the covers on the power transmission line can be objectively analyzed;
s20, monitoring wind power and wind direction of each node of the power transmission line in the target medium voltage line through a wind power monitoring end, further obtaining wind power and wind direction of each node of the power transmission line in the target medium voltage line, obtaining an included angle between wind direction of each node of the power transmission line in the target medium voltage line and the cable laying direction through reading the cable laying direction in the target medium voltage line, and recording the included angle as
Figure SMS_51
Simultaneously, the wind power of each node of the transmission line in the target medium voltage line is recorded as +.>
Figure SMS_52
Bringing the included angle between the wind direction of each node of the power transmission line and the cable laying direction in the target medium-voltage line and the wind force of each node of the power transmission line into a formula
Figure SMS_53
Further obtaining the wind power influence coefficient of each node of the transmission line in the target medium voltage line, and marking the wind power influence coefficient as +.>
Figure SMS_54
，/>
Figure SMS_55
Representing the maximum safe wind power of the power transmission line in the target medium-voltage line; the system comprehensively influences the wind power and the wind direction on the power transmission lineThe wind power influence coefficient of each node of the power transmission line in the target medium voltage line is obtained through the analysis mode, so that the wind power influence coefficient is smoother and more accurate;
s30, monitoring the cable tension of each node of the transmission line in the target medium voltage line through a sensor monitoring end to obtain the tension value of each node cable of the transmission line in the target medium voltage line, and recording the tension value as
Figure SMS_56
Further calculating and obtaining the tension influence coefficient of each node of the transmission line in the target medium-voltage line, and marking the tension influence coefficient as +.>
Figure SMS_57
The calculation formula of the tension influence coefficient of each node of the transmission line in the target medium voltage line is +.>
Figure SMS_58
Wherein->
Figure SMS_59
Representing the tension value of the power transmission line m-1 node cable in the target medium voltage line,/->
Figure SMS_60
Representing the tension value of the (m+1) th node cable of the transmission line in the target medium-voltage line; />
Figure SMS_61
Representing a standard tension of a transmission line cable in the target medium voltage line; the system calculates the tension by adopting a mode that each node of the power transmission line in the target medium voltage line is averaged with the front node and the rear node, so that the influence of overlarge cable tension deviation of a single node on the whole cable tension of the power transmission line is prevented, and the inaccuracy of cable tension analysis is avoided;
s40, analyzing the covering influence coefficient of each node of the power transmission line, the wind force influence coefficient of each node of the power transmission line and the tension influence coefficient of each node cable of the power transmission line in the target medium voltage line to obtain the fault rate of each node of the power transmission line of the target medium voltage line.
The calculation formula of the failure rate of each node of the target medium-voltage line power transmission is as follows
Figure SMS_62
，
Figure SMS_63
、/>
Figure SMS_64
Correction factors respectively representing wind power influence coefficients and covering influence coefficients in set transmission lines, < ->
Figure SMS_65
、/>
Figure SMS_66
、/>
Figure SMS_67
Respectively represent the weight ratio of the tension force influence coefficient of the power transmission line node cable, the weight ratio of the wind force influence coefficient of the power transmission line node, the weight ratio of the covering influence coefficient in the medium voltage line, and->
Figure SMS_68
。
The medium voltage line display module counts the fault rate of each node of the transmission line of the target medium voltage line, screens each node of the transmission line, which is larger than the preset fault rate, marks the node as a key inspection node of the transmission line, and inspects and overhauls the key inspection node of the transmission line.
According to the system, through fault analysis on the power generation side and the power transmission side of the medium-voltage circuit of the AC/DC flexible distribution network, the possible problems of the medium-voltage circuit in the operation process are more comprehensively screened out, and each faulty position is positioned, so that workers can conveniently analyze and examine the faulty position.
While embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention, which is also intended to be covered by the present invention.

Claims (8)

1. The utility model provides a flexible distribution network medium voltage line fault analysis processing system of alternating current-direct current, includes photovoltaic power generation group monitoring analysis module, its characterized in that, photovoltaic power generation group monitoring analysis module is used for monitoring and analyzing the power generation condition of each photovoltaic power generation group in the target medium voltage line, specifically includes:
the power generation environment monitoring unit is used for monitoring the natural environment within a preset time period of the photovoltaic power generation group in the target medium-voltage line to obtain environment influence parameters of the photovoltaic power generation group in the target medium-voltage line;
the power generation environment analysis unit is used for analyzing and obtaining rated power generation capacity of each photovoltaic power generation group in the target medium-voltage circuit according to the environmental influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit;
the power generation data monitoring end is used for collecting power generation data of all the photovoltaic inverters in the target medium-voltage circuit so as to obtain total actual power generation capacity of the photovoltaic power generation group corresponding to all the photovoltaic inverters in the target medium-voltage circuit;
the power generation data analysis unit is used for analyzing and obtaining the power generation failure rate of the target medium voltage circuit according to the rated power generation amount of each photovoltaic power generation group in the target medium voltage circuit and the total actual power generation amount of the photovoltaic power generation groups corresponding to each photovoltaic inverter;
the system for analyzing and processing faults of the medium-voltage line of the alternating-current and direct-current flexible distribution network further comprises a power transmission monitoring and analyzing module, a medium-voltage line database and a medium-voltage line display module, wherein the power transmission monitoring and analyzing module is used for monitoring and analyzing each node of the power transmission line in the target medium-voltage line, and the power transmission monitoring and analyzing module comprises:
the video monitoring terminal is used for carrying out video monitoring on the power transmission line corresponding to each node of the power transmission line in the target medium voltage line to obtain video monitoring data of the target medium voltage line;
the wind power monitoring end is used for monitoring wind power and wind direction of each node of the power transmission line in the target medium voltage line to obtain wind power and wind direction data of the target medium voltage line;
the sensor monitoring end is used for monitoring the cable tension of each node of the power transmission line in the target medium voltage line to obtain cable tension data of the target medium voltage line;
the power transmission analysis unit is used for respectively analyzing and obtaining covering influence coefficients, wind influence coefficients and tension influence coefficients of all nodes of the power transmission line in the target medium voltage line according to video monitoring data, wind force and wind direction data and cable tension data of the target medium voltage line, so as to obtain fault rates of all nodes of the power transmission of the target medium voltage line;
the medium voltage line database is used for storing the types corresponding to the photovoltaic power generation groups in the target medium voltage line and the power generation curves of the photovoltaic power generation groups in different types, the power generation loss rate of the photovoltaic power generation groups in the target medium voltage line, the safety area of ice coating and rainwater coating of the power transmission line in the target medium voltage line, the safety area of sundries coating, the laying direction of the cable in the target medium voltage line, the maximum safety wind power of the power transmission line in the target medium voltage line and the standard tension of the power transmission line cable in the target medium voltage line;
the medium voltage line display module is used for displaying the power generation failure rate and the power transmission failure rate of the target medium voltage line and positioning the specific position of the target medium voltage line, which needs to be subjected to failure processing.
2. The system for analyzing and processing faults of the medium voltage circuit of the alternating current/direct current flexible distribution network according to claim 1, wherein the power generation environment monitoring unit detects the illumination intensity and the environment temperature in a preset time period of the target medium voltage circuit through a power generation environment monitoring end, so as to obtain the environment influence parameters of the photovoltaic power generation group in the target medium voltage circuit, and the power generation environment monitoring end is an illumination sensor.
3. The system for analyzing and processing faults of medium-voltage lines of an ac/dc flexible distribution network according to claim 1, wherein the analysis mode of the power generation environment analysis unit is as follows: and the environmental influence parameters of the photovoltaic power generation groups in the target medium-voltage circuit are acquired and are brought into the power generation curves of the photovoltaic power generation groups with the corresponding types of the medium-voltage circuit database, so that rated power generation amount of each photovoltaic power generation group in the target medium-voltage circuit is obtained.
4. The system for analyzing and processing faults of medium-voltage lines of an ac/dc flexible distribution network according to claim 3, wherein the specific analysis mode of the power generation data analysis unit is as follows:
the method comprises the steps of firstly, collecting current of a total inlet wire end of each photovoltaic inverter of a target medium voltage circuit in a preset time through a power generation data monitoring end, multiplying each value of the total inlet wire end current of each photovoltaic inverter of the target medium voltage circuit in the preset time by a corresponding duration, superposing the values, further obtaining total actual power generation amount of a photovoltaic power generation group corresponding to each photovoltaic inverter in the target medium voltage circuit, and recording the total actual power generation amount as the total actual power generation amount of the photovoltaic power generation group corresponding to each photovoltaic inverter in the target medium voltage circuit
Figure QLYQS_1
H represents the h photovoltaic inverter in the target medium voltage line, h=1, 2, …, k;
step two, the rated power generation amount of each photovoltaic power generation group in the target medium-voltage circuit and the total actual power generation amount of the photovoltaic power generation groups corresponding to the photovoltaic inverters are brought into a formula
Figure QLYQS_2
Further, the power generation failure rate of the target medium voltage line is obtained and is recorded as +.>
Figure QLYQS_3
Wherein->
Figure QLYQS_4
The rated power generation amount of the f photovoltaic power generation group corresponding to the h photovoltaic inverter in the preset time is represented, and f=1, 2, … and j; />
Figure QLYQS_5
Hair representing a photovoltaic power generation groupElectrical loss rate.
5. The system for analyzing and processing faults of a medium-voltage circuit of an ac/dc flexible distribution network according to claim 4, wherein the medium-voltage circuit display module is used for receiving a power generation fault rate of a target medium-voltage circuit, if the power generation fault rate is greater than a preset power generation fault rate of the medium-voltage circuit, performing fault investigation on each photovoltaic inverter to screen one or more photovoltaic inverters with faults, and performing inspection investigation on the screened out faulty photovoltaic inverters and each photovoltaic power generation group corresponding to the selected faulty photovoltaic inverters.
6. The system for analyzing and processing faults of a medium-voltage line of an ac/dc flexible distribution network according to claim 1, wherein the specific monitoring and analyzing modes of the power transmission analyzing unit are as follows:
s10, image acquisition is carried out on the power transmission line corresponding to each node of the power transmission line in the target medium voltage line through a video monitoring end of the node, the type and the area of the covering of the power transmission line corresponding to the node are analyzed through image gray scale comparison, and then the covering influence coefficient of each node of the power transmission line in the target medium voltage line is obtained and recorded as
Figure QLYQS_8
M represents an mth node of the power transmission line in the target medium voltage line, m=1, 2, … and r, and a calculation formula of the covering influence coefficient of each node of the power transmission line in the target medium voltage line is as follows: />
Figure QLYQS_9
Wherein b1, b2 and b3 respectively represent a preset correction coefficient of ice for the cover, a correction coefficient of rainwater for the cover and a correction coefficient of sundries for the cover; />
Figure QLYQS_11
、/>
Figure QLYQS_7
、/>
Figure QLYQS_10
Respectively representing the ice-covered area, the rainwater-covered area and the sundry-covered area of the mth node of the power transmission line in the target medium-voltage line; />
Figure QLYQS_12
、/>
Figure QLYQS_13
、/>
Figure QLYQS_6
The safety area of the ice coating of the power transmission line, the safety area of the rainwater coating and the safety area of the sundries coating are respectively represented, and e represents a constant;
s20, monitoring wind power and wind direction of each node of the power transmission line in the target medium voltage line through a wind power monitoring end, further obtaining wind power and wind direction of each node of the power transmission line in the target medium voltage line, obtaining an included angle between wind direction of each node of the power transmission line in the target medium voltage line and the cable laying direction through reading the cable laying direction in the target medium voltage line, and recording the included angle as
Figure QLYQS_14
Simultaneously, the wind power of each node of the transmission line in the target medium voltage line is recorded as +.>
Figure QLYQS_15
The included angle between the wind direction of each node of the power transmission line and the cable laying direction in the target medium-voltage line is brought into the formula +.>
Figure QLYQS_16
Further obtaining the wind power influence coefficient of each node of the transmission line in the target medium voltage line, and marking the wind power influence coefficient as +.>
Figure QLYQS_17
，/>
Figure QLYQS_18
Representing the maximum safe wind power of the power transmission line in the target medium-voltage line;
s30, monitoring the cable tension of each node of the transmission line in the target medium voltage line through a sensor monitoring end to obtain the tension value of each node cable of the transmission line in the target medium voltage line, and recording the tension value as
Figure QLYQS_19
Further calculating and obtaining the tension influence coefficient of each node of the transmission line in the target medium-voltage line, and marking the tension influence coefficient as +.>
Figure QLYQS_20
The calculation formula of the tension influence coefficient of each node of the transmission line in the target medium voltage line is +.>
Figure QLYQS_21
Wherein->
Figure QLYQS_22
Representing the tension value of the power transmission line m-1 node cable in the target medium voltage line,/->
Figure QLYQS_23
Representing the tension value of the (m+1) th node cable of the transmission line in the target medium-voltage line; />
Figure QLYQS_24
Representing a standard tension of a transmission line cable in the target medium voltage line;
s40, analyzing the covering influence coefficient of each node of the power transmission line, the wind force influence coefficient of each node of the power transmission line and the tension influence coefficient of each node cable of the power transmission line in the target medium voltage line to obtain the fault rate of each node of the power transmission line of the target medium voltage line.
7. The system for analyzing and processing faults of medium-voltage lines of an alternating current/direct current flexible distribution network according to claim 6,the method is characterized in that the calculation formula of the failure rate of each node of the target medium-voltage line power transmission is as follows
Figure QLYQS_25
，
Figure QLYQS_26
、/>
Figure QLYQS_27
Correction factors respectively representing wind power influence coefficients and covering influence coefficients in set transmission lines, < ->
Figure QLYQS_28
、/>
Figure QLYQS_29
、/>
Figure QLYQS_30
Respectively represent the weight ratio of the tension force influence coefficient of the power transmission line node cable, the weight ratio of the wind force influence coefficient of the power transmission line node, the weight ratio of the covering influence coefficient in the medium voltage line, and->
Figure QLYQS_31
。
8. The system for analyzing and processing faults of medium-voltage lines in an ac/dc flexible distribution network according to claim 7, wherein the medium-voltage line display module counts fault rates of nodes of a target medium-voltage line power transmission line by receiving the fault rates, screens nodes of the power transmission line with the fault rates greater than a preset fault rate, marks the nodes as important power transmission line inspection nodes, and inspects and overhauls the important power transmission line inspection nodes.
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