CN110829392A - Ring network power supply system and fault detection method and device thereof - Google Patents

Ring network power supply system and fault detection method and device thereof Download PDF

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Publication number
CN110829392A
CN110829392A CN201911205164.7A CN201911205164A CN110829392A CN 110829392 A CN110829392 A CN 110829392A CN 201911205164 A CN201911205164 A CN 201911205164A CN 110829392 A CN110829392 A CN 110829392A
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China
Prior art keywords
power supply
voltage
supply section
load
switch
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CN201911205164.7A
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Chinese (zh)
Inventor
冯上贤
蒋世用
吕鹏飞
刘克勤
王京
盛明强
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201911205164.7A priority Critical patent/CN110829392A/en
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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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
    • 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
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H02H3/042—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned combined with means for locating the fault
    • 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
    • H02H7/261—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 involving signal transmission between at least two stations
    • H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
    • 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
    • H02H7/28—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 for meshed systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

Abstract

The disclosure relates to a looped network power supply system, a fault detection method and device thereof, and a computer readable storage medium. Looped netowrk power supply system includes: a bus ring; the power supplies are connected with the bus ring and arranged in parallel, and the part of the bus ring between two adjacent power supplies is a power supply section; each power supply section is provided with a normally closed switch connected in series; and the controller is used for judging that the power supply section has ground fault on one side of the load far away from the normally closed switch and sending out first alarm information when the normally closed switch on the power supply section is switched to the off state from the closed state and the load connected with the power supply section is switched to the stop working state from the normal working state.

Description

Ring network power supply system and fault detection method and device thereof
Technical Field
The present disclosure relates to the field of ring network power supply technologies, and in particular, to a ring network power supply system, a fault detection method and apparatus thereof, and a computer-readable storage medium.
Background
The network frame planning in the power grid planning has a great influence on the high quality, safety and economic operation of a power system, and a scientific and effective planning scheme is the basis of the network frame planning.
The ring network power supply system refers to a ring network formed by connecting a power supply and a load by a power line. When any section of line in the ring network has a fault, the fault section is isolated through the switching device, so that the normal power supply to other loads is not influenced. The looped network power supply can reduce voltage loss and power loss and improve the operation reliability of power supply.
When a line in a ring network power supply system fails, how to accurately and quickly locate the failed line is a technical problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the disclosure provides a looped network power supply system, a fault detection method and device thereof, and a computer readable storage medium, so as to accurately and quickly locate a faulted line section and improve the fault maintenance efficiency.
According to an aspect of the embodiments of the present disclosure, there is provided a power supply system for a looped network, including:
a bus ring;
the power supplies are connected with the bus ring and arranged in parallel, and the part of the bus ring between two adjacent power supplies is a power supply section;
each power supply section is provided with a normally closed switch connected in series;
and the controller is used for judging that the power supply section has ground fault on one side of the load far away from the normally closed switch and sending out first alarm information when the normally closed switch on the power supply section is switched to the off state from the closed state and the load connected with the power supply section is switched to the stop working state from the normal working state.
According to another aspect of the embodiments of the present disclosure, there is provided a fault detection method for a looped network power supply system, including:
controlling a normally closed switch on the power supply section to be switched off;
the method comprises the steps that working state information of a load connected with a power supply section before and after a normally closed switch is switched off is obtained, wherein the working state information comprises that the load is in a normal working state or the load is in a stop working state;
when the load is in a normal working state before the normally closed switch is disconnected and is in a stop working state after the normally closed switch is disconnected, it is judged that the power supply section has a ground fault on one side of the load, which is far away from the normally closed switch, and first alarm information is sent.
According to still another aspect of the embodiments of the present disclosure, there is provided a fault detection apparatus of a looped network power supply system, including:
the switch control unit is used for controlling the normally closed switch on the power supply section to be switched off;
the information acquisition unit is used for acquiring working state information of a load connected with the power supply section before and after the normally closed switch is switched off, wherein the working state information comprises that the load is in a normal working state or the load is in a stop working state;
and the judging unit is used for judging that the power supply section has ground fault on one side of the load far away from the normally closed switch and sending first alarm information when the load is in a normal working state before the normally closed switch is disconnected and is in a stop working state after the normally closed switch is disconnected.
According to still another aspect of the embodiments of the present disclosure, there is provided a fault detection apparatus for a looped network power supply system, including:
a memory; and a processor coupled to the memory, the processor configured to execute the fault detection method of any of the preceding claims based on instructions stored in the memory.
According to still another aspect of the embodiments of the present disclosure, there is provided a computer-readable storage medium having a computer program stored thereon, the computer program, when executed by a processor, implementing the fault detection method according to any one of the preceding claims.
By adopting the technical scheme of the embodiment of the disclosure, the line section with the fault can be accurately and quickly positioned, and the fault maintenance efficiency is improved.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of embodiments of the present disclosure with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a ring network power supply system according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of a ring network power supply system according to another embodiment of the disclosure;
fig. 3 is a flowchart of a fault detection method of a ring network power supply system according to an embodiment of the disclosure;
FIG. 4 is a flow chart of insulation resistance fault detection in another embodiment of the present disclosure;
fig. 5 is a block diagram of a fault detection device of a ring network power supply system according to an embodiment of the disclosure;
fig. 6 is a block diagram of a fault detection device of a ring network power supply system according to another embodiment of the disclosure;
FIG. 7 is a block diagram of a computer system according to an embodiment of the present disclosure.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps set forth in these embodiments should be construed as exemplary only and not as limiting unless otherwise specifically noted.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
At present, when a certain section of line in a ring network power supply system breaks down, technicians cannot accurately and quickly locate the broken section, so that maintenance delay is caused, and the efficiency of restoring operation of the broken section is influenced.
The embodiment of the disclosure provides a looped network power supply system, a fault detection method and device thereof, and a computer readable storage medium, so as to accurately and quickly locate a faulted line section and improve the fault maintenance efficiency.
As shown in fig. 1, some embodiments of the present disclosure provide a ring network power supply system, including:
a bus ring 10;
a plurality of power supplies 12 connected with the bus ring 10 and arranged in parallel, wherein the part of the bus ring 10 between two adjacent power supplies 12 is a power supply section 100;
a normally closed switch 14 connected in series on each power supply section 100;
and the controller 16 is configured to determine that the power supply section 100 has a ground fault on a side (e.g., an AB section in the drawing) of the load 50 away from the normally closed switch 14 when the normally closed switch 14 on the power supply section 100 is switched from the closed state to the open state and the load 50 connected to the power supply section 100 is switched from the normal operating state to the stop operating state, and send out first alarm information.
Further, the controller 16 is further configured to determine that a ground fault occurs on the other side (e.g., AC section in the figure) of the load 50 of the power supply section 100 and send out a second alarm message when the normally-closed switch 14 on the power supply section 100 is closed and the load 50 to which the power supply section 100 is connected is in a stop working state.
In the embodiment of the present disclosure, the ring network power supply system may be an ac ring network power supply system or a dc ring network power supply system. As shown in fig. 1, in the embodiment, the ring network power supply system is a dc ring network power supply system, and the power supply 12 includes a power grid 122, a photovoltaic module 124 and a converter 120. The converter 120 is a bidirectional converter, and includes a DC/DC conversion module (a DC/DC conversion module for converting an electric energy of one voltage value into an electric energy of another voltage value in a DC circuit) and an AC/DC conversion module (an AC/DC conversion module for converting an AC power into a DC power). When the illumination intensity can meet the power supply requirement, the direct current output by the photovoltaic module 124 is transmitted to the bus ring 10 through the DC/DC conversion module of the converter 120, and when the illumination intensity is not enough to meet the power supply requirement, the alternating current output by the power grid 122 is converted into the direct current through the AC/DC conversion module of the converter 120 and then transmitted to the bus ring 10. In addition, according to a certain control strategy, the grid 122 and the photovoltaic module 124 can simultaneously supply direct current to the bus ring 10 through the converter 120.
It is noted that in other embodiments of the present disclosure, the power source 12 may not include the photovoltaic module 124, but only the grid 122 outputs dc power to the bus bar loop 10 via the converter 120. Alternatively, the power source 12 does not include the grid 122, and only the photovoltaic module 124 outputs dc power to the bus bar ring 10 via the converter 14. The particular form of the power source 12 is selected based on the power requirements of the load 50 and the application scenario.
In the embodiment of the present disclosure, the normally-closed switch 14 may be a contactor, a relay, or the like, for example, wherein the relay may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) type relay, an IGBT (Insulated Gate Bipolar Transistor) type relay, or a GTO (Gate Turn-Off thyristor) type relay, or the like.
Based on the characteristics of ring network power supply, when the ring network power supply system works normally, when the normally closed switch 14 of any power supply section 100 of the bus ring 10 is disconnected, if the power supply section 100 has no ground fault, the power supply 12 can still supply power to the load 50 from the side of the load 50 away from the normally closed switch 14, and the load 50 can still work normally.
As shown in fig. 1, in the embodiment of the present disclosure, when the load 50 is in the normal operation state before the normally-closed switch 14 is opened, and is in the stop operation state after the normally-closed switch 14 is opened, it may be determined that the ground fault occurs in the power supply section 100 on the side of the load 50 away from the normally-closed switch 14, and the power output of the power supply 12 to the load 50 is affected. The controller 16 sends a first alarm message after determining that the portion of the power supply section 100 has a ground fault, where the first alarm message includes, for example, a location code and fault content of the fault section, so as to remind a system maintenance person to repair the fault section in time.
When the normally closed switch 14 on the power supply section 100 is closed and the load 50 connected to the power supply section 100 is in a stop state, it can be determined that a ground fault occurs on the other side of the load 50 in the power supply section 100, which affects the power output of the power supply 12 to the load 50. The controller 16 sends out a second alarm message after determining that the portion of the power supply section 100 has a ground fault, where the second alarm message includes, for example, a location code and fault content of the fault section, so as to remind a system maintenance person to repair the fault section in time.
Therefore, by adopting the design scheme of the ring network power supply system, the line section with the ground fault in the bus ring can be accurately and quickly positioned, so that the fault maintenance efficiency can be improved.
As shown in fig. 2, in some embodiments of the present disclosure, the ring network power supply system further includes: an insulation resistance detection circuit 18 connected to the power supply section 100, the insulation resistance detection circuit 18 including a first branch and a second branch connected in parallel and grounded, the first branch including a first resistor R1 and a first switch S1 connected in series, the second branch including a second resistor R2 and a second switch S2 connected in series; and a voltage detection means 20 for detecting a voltage to ground of the positive line 101 of the power supply section 100 and a voltage to ground of the negative line 102 of the power supply section 100.
Under normal operating conditions, the insulation resistance of the positive line 101 and the negative line 102 of the power supply section 100 should reach the megaohm level. However, as the line ages, its insulation coating may peel off, the metal wire is exposed to air and corroded and oxidized, the insulation resistance decreases, and if the metal wire is not processed in time, the metal wire is likely to break or discharge to the ground, and finally a ground fault is developed.
In the disclosed embodiment, the insulation resistance detection circuit 18 may be used to detect the insulation resistance value of the positive line 101 and the insulation resistance value of the negative line 102 of the power supply section 100.
Specifically, the controller 16 is configured to close the first switch S1 and open the second switch S2 at a first time, and close the second switch S2 and open the first switch S1 at a second time when the normally closed switch 14 corresponding to the power supply segment 100 is opened and the load 50 normally operates; obtaining an insulation resistance value of the positive line 101 and an insulation resistance value of the negative line 102 from a resistance value of the first resistor R1, a resistance value of the second resistor R2, a first voltage-to-ground voltage of the positive line 101 and a first voltage-to-ground voltage of the negative line 102 at a first time, and a second voltage-to-ground voltage of the positive line 101 and a second voltage-to-ground voltage of the negative line 102 at a second time; when the insulation resistance value of the positive line 101 is smaller than a set first threshold value, first warning information is sent out; and when the insulation resistance value of the negative line 102 is smaller than a set second threshold value, a second warning message is sent out.
When the normally closed switch 14 corresponding to the power supply section 100 is turned off, if the load 50 operates normally, the first switch S1 is closed and the second switch S2 is opened at a first time, and after the circuit is stabilized, the voltage detection device 20 detects the voltages to the positive line 101 and the negative line 102 of the power supply section 100. At this time, the resistance value of the first resistor R1, the resistance value of the second resistor R2, the first voltage-to-ground voltage of the positive line 101 and the first voltage-to-ground voltage of the negative line 102 at the first time, the insulation resistance value of the positive line 101, and the insulation resistance value of the negative line 102 satisfy:
Figure BDA0002296778640000071
wherein R is+Is the insulation resistance value, R, of the positive electrode wire 101-Is the insulation resistance value, R, of the negative line 1021Is the resistance value of the first resistor R1, R2Is the value of the second resistor R2, U1+Is the first voltage to ground of the positive line 101, U1-A first voltage to ground of the negative line 102.
Then, the normally closed switch 14 corresponding to the power supply segment 100 is maintained to be opened, the first switch S1 is opened and the second switch S2 is closed at the second time, and after the circuit is stabilized, the voltage detection device 20 detects the voltages to the positive line 101 and the negative line 102 of the power supply segment 100. At this time, the resistance value of the first resistor R1, the resistance value of the second resistor R2, the second voltage to ground of the positive line 101 and the second voltage to ground of the negative line 102 at the second timing, the insulation resistance value of the positive line 101, and the insulation resistance value of the negative line 102 satisfy:
Figure BDA0002296778640000072
wherein, U2+Is the second voltage to ground, U, of the positive line 1012-A second voltage to ground of the negative line 102.
The combination of formula (one) and formula (two) yields:
Figure BDA0002296778640000073
therefore, in one embodiment of the present disclosure, the insulation resistance value of the positive electrode line 101 and the insulation resistance value of the negative electrode line 102 can be obtained according to the above equation (three).
Through the design scheme of the embodiment, whether the power supply section has serious insulation impedance reduction or not can be quickly judged, so that the fault maintenance efficiency is improved, and the stable and reliable operation of the ring network power supply system is ensured.
In another embodiment of the present disclosure, the maintenance personnel may also manually open the normally closed switch 14 corresponding to the power supply section 100, and if the load 50 works normally, close the first switch S1 and open the second switch S2 at the first time, close the second switch S2 and open the first switch S1 at the second time, and then obtain the insulation resistance value of the positive line 101 and the insulation resistance value of the negative line 102 according to the above equation (three). When the insulation resistance value of the positive wire 101 is smaller than a set first threshold value, it is determined that the positive wire 101 has a serious insulation resistance drop, and when the insulation resistance value of the negative wire 102 is smaller than a set second threshold value, it is determined that the negative wire 102 has a serious insulation resistance drop.
In some embodiments of the present disclosure, the controller 16 is configured to sequentially perform the ground fault and insulation impedance detection for each of the power supply segments 100 according to a set sequence. For example, the detection of the ground fault and the insulation impedance is performed sequentially for each power supply section 100 in a clockwise direction or a counterclockwise direction of the power supply ring 10 in the figure. The controller 16 may perform ground fault and insulation impedance detection on the power supply loop 10 at a set frequency (e.g., once every 24 hours). The controller 16 may also initiate the above-described ground fault and insulation resistance detection upon receiving a detection initiation command input by a maintenance person. When the current power supply segment 100 is detected, the power supply of the remaining power supply segments 100 to the load 50 is not affected.
In the embodiment of the present disclosure, the controller 16 may output the first alarm information and the second alarm information of the ground fault, the first alarm information and the second alarm information of the serious insulation resistance drop to a control platform of the ring network power supply system, and the control platform sends out the alarm information or the alarm information in at least one media form (such as sound, text, or video). The control platform may be, for example, a related APP installed in a mobile phone of a maintenance worker.
In the embodiment of the present disclosure, the controller 16 is further configured to control the switching devices (not shown in the figure) at two ends of the faulty power supply section to be turned off when at least one of the first alarm information, the second alarm information, the first alarm information and the second alarm information is sent out, so as to isolate the faulty power supply section. After the maintenance personnel finish the maintenance, the power supply section is connected again, and the power supply of the power supply section is recovered, so that the purposes of reducing the power failure range and reducing the power failure time of the load are achieved.
As shown in fig. 3, an embodiment of the present disclosure further provides a fault detection method applied to the aforementioned ring network power supply system, where the method includes the following steps S301 to S302.
In step S301, a normally closed switch on the power supply section is controlled to be switched off;
in step S302, working state information of a load connected to the power supply section before and after the normally closed switch is turned off is obtained, the working state information including that the load is in a normal working state or that the load is in a stop working state;
in step S303, when the load is in a normal operating state before the normally closed switch is turned off and is in a stop operating state after the normally closed switch is turned off, it is determined that a ground fault occurs on a side of the power supply section where the load is away from the normally closed switch, and a first alarm message is sent.
In some embodiments, the fault detection method further comprises: and when the normally closed switch on the power supply section is closed and the load connected with the power supply section is in a stop working state, judging that the power supply section has a ground fault on the other side of the load and sending out second alarm information.
In some embodiments, the ring network power supply system further comprises: the insulation resistance detection circuit is connected with the power supply section, the insulation resistance detection circuit comprises a first branch circuit and a second branch circuit which are connected in parallel and grounded, the first branch circuit comprises a first resistor and a first switch which are connected in series, and the second branch circuit comprises a second resistor and a second switch which are connected in series. As shown in fig. 4, the fault detection method may further include the following steps S401 to S403.
In step S401, it is obtained that the normally closed switch corresponding to the power supply section is turned off, the load normally operates, the first switch is turned on, and when the second switch is turned off, the first voltage-to-ground voltage of the positive line and the first voltage-to-ground voltage of the negative line of the power supply section are turned off, and the load normally operates, and when the first switch is turned off and the second switch is turned off, the second voltage-to-ground voltage of the positive line and the second voltage-to-ground voltage of the negative line of the power supply section are turned off.
In step S402, an insulation resistance value of the positive line and an insulation resistance value of the negative line are obtained from the resistance value of the first resistor, the resistance value of the second resistor, the first voltage-to-ground voltage of the positive line and the first voltage-to-ground voltage of the negative line at the first time, and the second voltage-to-ground voltage of the positive line and the second voltage-to-ground voltage of the negative line at the second time.
In step S403, when the insulation resistance value of the positive electrode line is smaller than a set first threshold value, first warning information is issued, and when the insulation resistance value of the negative electrode line is smaller than a set second threshold value, second warning information is issued.
In some embodiments, the insulation resistance value of the positive wire and the insulation resistance value of the negative wire are obtained according to the following functional relation:
Figure BDA0002296778640000101
wherein R is+Is the insulation resistance value, R, of the positive electrode wire-Is the insulation resistance value, R, of the negative electrode wire1Is the resistance value of the first resistor, R2Is the resistance value of the second resistor, U1+A first voltage to ground of the positive line, U1-A first voltage to ground of the negative line, U2+A second voltage to ground of the positive line, U2-A second voltage to ground of the negative line.
By adopting the fault detection method of the embodiment of the disclosure, the fault line section of the bus ring can be accurately and quickly positioned, so that the fault maintenance efficiency can be improved, and the stable and reliable operation of the ring network power supply system can be ensured. In a further embodiment, whether the power supply section has serious insulation impedance reduction can be quickly judged, so that stable and reliable operation of the ring network power supply system is further guaranteed.
As shown in fig. 5, an embodiment of the present disclosure further provides a fault detection apparatus applied to the ring network power supply system, including:
a switch control unit 501, configured to control a normally closed switch on the power supply section to be turned off;
the information obtaining unit 503 is configured to obtain working state information of a load connected to the power supply section before and after the normally closed switch is turned off, where the working state information includes that the load is in a normal working state or that the load is in a stop working state;
and the judging unit 505 is configured to, when the load is in a normal working state before the normally closed switch is turned off and is in a stop working state after the normally closed switch is turned off, judge that a ground fault occurs on one side of the load, which is far away from the normally closed switch, of the power supply section and send out first alarm information.
Similarly, by adopting the fault detection device of the embodiment of the disclosure, the fault line section of the bus ring can be accurately and quickly positioned, so that the fault maintenance efficiency can be improved, and the stable and reliable operation of the ring network power supply system can be guaranteed.
As shown in fig. 6, some embodiments of the present disclosure further provide a fault detection device of a looped network power supply system, including: a memory 61 and a processor 62 coupled to the memory 61, the processor 62 being configured to execute the fault detection method according to any of the embodiments described above based on instructions stored in the memory 61.
It should be understood that the various steps in the aforementioned fault detection method may be implemented by a processor, and may be implemented by any one of software, hardware, firmware, or a combination thereof.
In addition to the above-described fault detection methods, apparatus, embodiments of the present disclosure may take the form of a computer program product embodied on one or more non-volatile storage media containing computer program instructions. Therefore, some embodiments of the present disclosure further provide a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the fault detection method according to any of the foregoing technical solutions.
FIG. 7 illustrates a schematic diagram of a computer system of some embodiments of the present disclosure.
As shown in FIG. 7, the computer system may be embodied in the form of a general purpose computing device, which may be used to implement the fault detection methods of the embodiments described above. The computer system includes a memory 71, a processor 72, and a bus 70 that connects the various system components.
The memory 71 may include, for example, a system memory, a non-volatile storage medium, and the like. The system memory stores, for example, an operating system, an application program, a Boot Loader (Boot Loader), and other programs. The system memory may include volatile storage media such as Random Access Memory (RAM) and/or cache memory. The non-volatile storage medium stores, for example, instructions to perform corresponding embodiments of the above-described fault detection method. Non-volatile storage media include, but are not limited to, magnetic disk storage, optical storage, flash memory, and the like.
The processor 72 may be implemented as discrete hardware components, such as a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gates or transistors, or the like. Accordingly, each of the modules, such as the judging module and the determining module, may be implemented by a Central Processing Unit (CPU) executing instructions in a memory for performing the corresponding step, or may be implemented by a dedicated circuit for performing the corresponding step.
The bus 70 may use any of a variety of bus architectures. For example, bus structures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MCA) bus, and Peripheral Component Interconnect (PCI) bus.
The computer system may also include an input output interface 73, a network interface 74, a storage interface 75, and the like. The input/output interface 73, the network interface 74, the storage interface 75, and the memory 71 may be connected to the processor 72 via the bus 70. The input/output interface 73 may provide a connection interface for an input/output device such as a display, a mouse, and a keyboard. The network interface 74 provides a connection interface for various networking devices. The storage interface 75 provides a connection interface for external storage devices such as a floppy disk, a usb disk, and an SD card.
Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (14)

1. A looped network power supply system comprising:
a bus ring;
the power supplies are connected with the bus ring and arranged in parallel, and the part of the bus ring between two adjacent power supplies is a power supply section;
each power supply section is provided with a normally closed switch connected in series;
and the controller is used for judging that the power supply section has ground fault on one side of the load far away from the normally closed switch and sending out first alarm information when the normally closed switch on the power supply section is switched to the off state from the closed state and the load connected with the power supply section is switched to the stop working state from the normal working state.
2. The ring network power supply system of claim 1, wherein: and the controller is used for judging that the power supply section has ground fault on the other side of the load and sending out second alarm information when the normally closed switch on the power supply section is closed and the load connected with the power supply section is in a work stop state.
3. The ring network power supply system according to claim 1 or 2, further comprising:
the insulation impedance detection circuit is connected with the power supply section and comprises a first branch circuit and a second branch circuit which are connected in parallel and grounded, the first branch circuit comprises a first resistor and a first switch which are connected in series, and the second branch circuit comprises a second resistor and a second switch which are connected in series; and
and the voltage detection device is used for detecting the voltage to ground of the positive electrode line of the power supply section and the voltage to ground of the negative electrode line of the power supply section.
4. The ring network power supply system of claim 3, wherein: the controller is used for closing the first switch and opening the second switch at a first moment and closing the second switch and opening the first switch at a second moment when the normally closed switch corresponding to the power supply section is opened and the load works normally; obtaining an insulation resistance value of the positive line and an insulation resistance value of the negative line according to the resistance value of the first resistor, the resistance value of the second resistor, the first voltage-to-ground voltage of the positive line and the first voltage-to-ground voltage of the negative line at the first moment, and the second voltage-to-ground voltage of the positive line and the second voltage-to-ground voltage of the negative line at the second moment; when the insulation resistance value of the positive line is smaller than a set first threshold value, sending out first warning information; and when the insulation resistance value of the negative electrode wire is smaller than a set second threshold value, sending out second warning information.
5. The ring network power supply system of claim 4, wherein the controller is configured to sequentially perform ground fault and insulation impedance detection for each power supply segment in a set order.
6. The ring network power supply system of claim 1, wherein: the normally closed switch includes a contactor or a relay.
7. The ring network power supply system of claim 1, wherein: the power supply comprises a power grid and a converter, and the power grid transmits direct current to the bus ring through the converter; and/or
The power supply comprises a photovoltaic assembly, and the photovoltaic assembly transmits direct current to the bus ring through a converter.
8. A fault detection method of a looped network power supply system comprises the following steps:
controlling a normally closed switch on the power supply section to be switched off;
the method comprises the steps that working state information of a load connected with a power supply section before and after a normally closed switch is switched off is obtained, wherein the working state information comprises that the load is in a normal working state or the load is in a stop working state;
when the load is in a normal working state before the normally closed switch is disconnected and is in a stop working state after the normally closed switch is disconnected, it is judged that the power supply section has a ground fault on one side of the load, which is far away from the normally closed switch, and first alarm information is sent.
9. The fault detection method of claim 8, further comprising:
and when the normally closed switch on the power supply section is closed and the load connected with the power supply section is in a stop working state, judging that the power supply section has a ground fault on the other side of the load and sending out second alarm information.
10. The fault detection method according to claim 8 or 9, wherein: the looped network power supply system further includes: the insulation impedance detection circuit is connected with the power supply section and comprises a first branch circuit and a second branch circuit which are connected in parallel and grounded, the first branch circuit comprises a first resistor and a first switch which are connected in series, and the second branch circuit comprises a second resistor and a second switch which are connected in series;
the fault detection method further comprises the following steps:
acquiring a first voltage-to-ground voltage of a positive electrode line and a first voltage-to-ground voltage of a negative electrode line of a power supply section when a normally closed switch corresponding to the power supply section is opened, a load normally works, the first switch is closed, and a second switch is opened, a load normally works, the first switch is opened, and a second voltage-to-ground voltage of the positive electrode line and a second voltage-to-ground voltage of the negative electrode line of the power supply section when the second switch is closed;
obtaining an insulation resistance value of the positive line and an insulation resistance value of the negative line according to the resistance value of the first resistor, the resistance value of the second resistor, the first voltage-to-ground voltage of the positive line and the first voltage-to-ground voltage of the negative line at the first moment, and the second voltage-to-ground voltage of the positive line and the second voltage-to-ground voltage of the negative line at the second moment;
when the insulation resistance value of the positive line is smaller than a set first threshold value, sending out first warning information;
and when the insulation resistance value of the negative electrode wire is smaller than a set second threshold value, sending out second warning information.
11. The fault detection method of claim 10, wherein: the insulation resistance value of the positive electrode wire and the insulation resistance value of the negative electrode wire are obtained according to the following functional relation:
Figure FDA0002296778630000031
wherein R is+Is the insulation resistance value, R, of the positive electrode wire-Is the insulation resistance value, R, of the negative electrode wire1Is the resistance value of the first resistor, R2Is the resistance value of the second resistor, U1+A first voltage to ground of the positive line, U1-A first voltage to ground of the negative line, U2+A second voltage to ground of the positive line, U2-A second voltage to ground of the negative line.
12. A fault detection device of a looped network power supply system, comprising:
the switch control unit is used for controlling the normally closed switch on the power supply section to be switched off;
the information acquisition unit is used for acquiring working state information of a load connected with the power supply section before and after the normally closed switch is switched off, wherein the working state information comprises that the load is in a normal working state or the load is in a stop working state;
and the judging unit is used for judging that the power supply section has ground fault on one side of the load far away from the normally closed switch and sending first alarm information when the load is in a normal working state before the normally closed switch is disconnected and is in a stop working state after the normally closed switch is disconnected.
13. A fault detection device of a looped network power supply system, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the fault detection method of any of claims 8 to 11 based on instructions stored in the memory.
14. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the fault detection method according to any one of claims 8 to 11.
CN201911205164.7A 2019-11-29 2019-11-29 Ring network power supply system and fault detection method and device thereof Pending CN110829392A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024027043A1 (en) * 2022-08-02 2024-02-08 广东汇天航空航天科技有限公司 Power distribution system and method for flaying car, and flying car

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024027043A1 (en) * 2022-08-02 2024-02-08 广东汇天航空航天科技有限公司 Power distribution system and method for flaying car, and flying car

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