CN112838679A - Online direct-current power supply system feeder fault isolation device and operation method thereof - Google Patents

Online direct-current power supply system feeder fault isolation device and operation method thereof Download PDF

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Publication number
CN112838679A
CN112838679A CN202110304623.8A CN202110304623A CN112838679A CN 112838679 A CN112838679 A CN 112838679A CN 202110304623 A CN202110304623 A CN 202110304623A CN 112838679 A CN112838679 A CN 112838679A
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CN
China
Prior art keywords
electric energy
transmission unit
energy transmission
acquisition circuit
straight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110304623.8A
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Chinese (zh)
Inventor
洪小龙
胡海琴
汤中会
李军
黄启建
李建柱
许磊
曹现峰
刘洋
江国权
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Chizhou Power Supply Co of State Grid Anhui Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Chizhou Power Supply Co of State Grid Anhui Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by State Grid Corp of China SGCC, Chizhou Power Supply Co of State Grid Anhui Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN202110304623.8A priority Critical patent/CN112838679A/en
Publication of CN112838679A publication Critical patent/CN112838679A/en
Pending legal-status Critical Current

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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
    • 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
    • H02H7/268—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 dc systems
    • 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
    • H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
    • H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

The invention discloses a fault isolation device for a feeder circuit of a direct-current power supply system and an operation method thereof, wherein the device comprises a generator, an isolation type electric energy transmission unit, a straight-through type electric energy transmission unit, an input unit and an output unit; the input unit is respectively connected to the isolated electric energy transmission unit and the straight-through electric energy transmission unit; the input unit is respectively connected to the isolated electric energy transmission unit and the straight-through electric energy transmission unit; the isolated electric energy transmission unit and the straight-through electric energy transmission unit are connected in parallel. The invention can actively realize fault monitoring, isolate fault loop and ensure no power loss of load, thereby ensuring safe and stable operation of the direct current system.

Description

Online direct-current power supply system feeder fault isolation device and operation method thereof
Technical Field
The invention belongs to the field of direct-current power supply systems, and particularly relates to an online direct-current power supply system feeder fault isolation device and an operation method thereof.
Background
In a transformer substation or a power plant, a direct-current power supply system is used as a power supply for loads such as protection and control, and when power is lost, misoperation or refusal of the protection and control load can be caused, especially, the refusal can further cause paralysis of a local power grid, and the accident of the power grid is a major accident of the power grid. As a more reliable backup power source, some unreliable accidents have occurred in recent years, which mainly include the following two points:
1) when the alternating current power supply loses power, the storage battery cannot be used in time, so that the direct current system loses power;
2) due to the limitation of the monitoring device, when the direct current power supply system generates grounding, alternating current channeling or two groups of direct current channeling faults, a fault branch cannot be selected, or a specific position cannot be found after the fault branch is selected, so that the fault of a certain branch brings the fault of the whole direct current power supply system, such as the grounding-caused ground voltage deviation of the positive electrode and the negative electrode of a bus, the false operation risk brought by alternating current channeling, the overvoltage brought by the two groups of direct current channeling and the like.
Based on the above problems, some solutions are provided for some colleges, scientific research units, operation units and manufacturers, such as:
1) patent 201310668765.8 provides a "charge-discharge compensation system for series-connected storage battery pack", which realizes the compensation of the fault of the single storage battery by providing a charger for each single storage battery;
2) patent 201010598584.9 provides a "dc power system based on parallel connection of storage batteries", in which multiple sets of batteries are connected in parallel by using inverters, and when one or more batteries are failed, the failed storage battery can still provide power for the dc bus;
3) patent 201410316418.3 provides an "automatic zero-gap bypass system for battery pack", in which a monitoring and management unit and a bypass unit are provided on each single battery, and when a fault is detected in the single battery, the battery is automatically bypassed, so that the requirement that the battery pack formed by the single batteries without fault can continuously provide power is realized.
4) Patent CN201611074785.2 provides a "system for preventing DC power supply bus from losing voltage and its operation method", which is to group storage batteries and compensate the grouped storage batteries to the bus in a DC/DC boosting manner, so as to monitor and compensate possible DC bus voltage loss, and ensure the safe and stable operation of the DC system.
Although the above 4 patents monitor and compensate for the loss voltage to a certain extent, they all have their limitations, and the cost is high due to the addition of a large number of components.
5) Patent CN201721110424.9 provides a direct current power supply system feeder return circuit trouble isolating device, solves in the direct current power supply system operation and maintenance engineering of transformer substation or power plant, can keep apart the trouble return circuit, can make the load not lose the device that the electricity provided again, but this trouble isolating device only keeps apart the trouble return circuit through DC/DC alone, can not automatic identification and initiative isolation, can not realize online monitoring and isolation, has the limitation.
Disclosure of Invention
The invention provides an on-line type direct current power supply system feeder line fault isolation device and an operation method thereof to overcome the defects of the prior art, so that fault monitoring can be actively realized, a fault loop can be isolated, and the load can not lose power, thereby ensuring the safe and stable operation of a direct current system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to an on-line type DC power supply system feeder line fault isolation device which is characterized by comprising the following components: the device comprises a controller, an isolated electric energy transmission unit, a straight-through electric energy transmission unit, an input unit and an output unit;
the input unit comprises two groups of input terminals and is respectively connected with the input ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the isolated electric energy transmission unit is used for electrically isolating and transmitting electric energy and is connected with the straight-through electric energy transmission unit in parallel;
the through type electric energy transmission unit comprises an electric element with a mechanical breakpoint;
the output unit also comprises two groups of input terminals and is respectively connected with the output ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the controller includes: the system comprises a direct current voltage acquisition circuit, an alternating current voltage acquisition circuit, a direct current acquisition circuit, an alternating current acquisition circuit, a state input acquisition circuit, an output and control circuit and a central control circuit;
the input ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the input unit, and the output ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the output unit;
the state input acquisition circuit is connected with the isolated electric energy transmission unit;
the output and control circuit is connected with the straight-through type electric energy transmission unit;
the central control circuit is used for coordinating the operation of each unit.
The on-line type direct current power supply system feeder line fault isolation device is also characterized in that,
the isolated electric energy transmission unit comprises at least one isolated DC/DC device;
the through type electric energy transmission unit comprises at least one breaker, and/or contactor, and/or relay, and/or isolating switch, and/or solid-state switch.
The invention relates to an operation method of an online direct current power supply system feeder fault isolation device, which is characterized by comprising the following steps of:
step 1) closing mechanical breakpoints of electrical elements contained in the straight-through type electric energy transmission unit to enable electric energy of the input unit to flow through the straight-through type electric energy transmission unit;
step 2) collecting the current Io of the output unit;
step 3) decomposing an alternating current component Ioac of the current Io;
step 4) comparing the alternating current component Ioac with a set threshold value Ioacs, and if Ioac is larger than or equal to Ioacs, disconnecting mechanical breakpoints of electrical elements contained in the straight-through type electric energy transmission unit, otherwise, turning to step 2);
step 5) after the mechanical breakpoints of the electrical elements contained in the straight-through type electric energy transmission unit are disconnected, enabling the electric energy of the input unit to flow through the isolation type electric energy transmission unit and sending an alarm signal;
step 6) waiting for reset.
The operating method according to the invention is also characterized in that:
in the step 4, a remote instruction and/or a local instruction can be set to forcibly disconnect the mechanical breakpoints of the electrical elements contained in the through type electric energy transmission unit;
the remote instruction is sent by a wired communication circuit or a wireless communication circuit;
the in-place instruction is sent through a control of the operating device.
Compared with the prior art, the invention has the beneficial effects that:
the invention can automatically identify and actively isolate the fault loop under the condition of not losing power of the load in the operation maintenance and overhaul engineering of the direct current power supply system of the transformer substation or the power plant by arranging the element which can transmit electric energy and has the input and output which are electrically isolated, and the device is simple and easy to realize, reduces the equipment cost and has higher practicability.
Drawings
FIG. 1 is a technical schematic diagram of a fault isolation apparatus of the present invention;
FIG. 2 is a technical schematic of the controller of the present invention;
fig. 3 is a schematic connection diagram of an isolation type power transmission unit and a straight-through type power transmission unit according to the present invention;
fig. 4 is a technical schematic diagram of the fault isolation method of the present invention.
Detailed Description
In this embodiment, as shown in fig. 1, an online dc power supply system feeder fault isolation apparatus may be installed in a dc screen, and includes: the device comprises a controller, an isolated electric energy transmission unit, a straight-through electric energy transmission unit, an input unit and an output unit;
the input unit comprises two groups of input terminals, the two groups of input terminals can be one element or two elements, in the specific implementation, one group or two groups of wiring terminals are used for input wiring of a user, wherein, as shown in fig. 3, the two groups of wiring terminals are preferably adopted and are respectively connected with the input ends of the isolated electric energy transmission unit and the through type electric energy transmission unit;
the isolated type electric energy transmission unit comprises at least one isolated type DC/DC device, is used for realizing electric energy transmission from the input unit to the output unit and electric isolation in the transmission process, and is connected with the straight-through type electric energy transmission unit in parallel; the parallel connection is important, and in a normal power supply state, electric energy is supplied by the through type electric energy transmission unit through control, and in a fault state, the electric energy is supplied by the isolation type electric energy transmission unit through control.
The through type electric energy transmission unit comprises at least one controllable electric element with a mechanical breakpoint; for example, at least one circuit breaker, and/or contactor, and/or relay, and/or disconnector, and/or solid state switch, or a combination of the above.
The output unit also comprises two groups of input terminals, and the two groups of input terminals can be one element or two elements; in specific implementation, the device can be a group of or two groups of wiring terminals for output wiring of users, wherein a group of wiring terminals is preferably adopted and is respectively connected with the output ends of the isolated type electric energy transmission unit and the through type electric energy transmission unit;
as shown in fig. 2, the controller is a core of the apparatus, and is used for implementing coordinated control of the apparatus as a whole, and includes: the system comprises a direct current voltage acquisition circuit, an alternating current voltage acquisition circuit, a direct current acquisition circuit, an alternating current acquisition circuit, a state input acquisition circuit, an output and control circuit and a central control circuit; the operation of each unit, especially the operation of the isolated type electric energy transmission unit and the straight-through type electric energy transmission unit, is coordinated through collection, operation, logic judgment and output.
The input ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the input unit, and the output ends of the direct current voltage acquisition circuit, the alternating current acquisition circuit and the alternating current acquisition circuit are respectively connected with the output unit;
the state input acquisition circuit is connected with the isolated electric energy transmission unit;
the output and control circuit is connected with the through type electric energy transmission unit.
In this embodiment, as shown in fig. 4, an operation method of an online dc power supply system feeder fault isolation apparatus includes the following steps:
step 1) closing mechanical breakpoints of electrical elements contained in the straight-through type electric energy transmission unit to enable electric energy of the input unit to flow through the straight-through type electric energy transmission unit;
step 2) collecting the current Io of the output unit;
step 3) decomposing an alternating current component Ioac of the current Io;
step 4) comparing the alternating current component Ioac with a set threshold value Ioacs, and disconnecting the mechanical break point of the electric element contained in the straight-through type electric energy transmission unit if the Ioac is larger than or equal to the Ioacs, otherwise, turning to the step 2);
in the specific implementation, the mechanical breakpoints of the electric elements contained in the straight-through type electric energy transmission unit can be forcibly disconnected by setting a remote instruction and/or a local instruction;
the remote instruction is sent by a wired communication circuit or a wireless communication circuit; wired communication circuits, e.g. 485, 232, CAN, Ethernet, I2C. TTL, wireless communication circuits such as Bluetooth, 4G/5G communication network, WIFI and the like;
the local command is sent through a control of the operating device, such as a button, a key, an input terminal, a display, a touch screen and the like.
Step 5) after the mechanical breakpoints of the electrical elements contained in the straight-through type electric energy transmission unit are disconnected, enabling the electric energy of the input unit to flow through the isolation type electric energy transmission unit and sending an alarm signal;
step 6) waiting for reset.

Claims (4)

1. An online direct current power supply system feeder fault isolation device, its characterized in that includes: the device comprises a controller, an isolated electric energy transmission unit, a straight-through electric energy transmission unit, an input unit and an output unit;
the input unit comprises two groups of input terminals and is respectively connected with the input ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the isolated electric energy transmission unit is used for electrically isolating and transmitting electric energy and is connected with the straight-through electric energy transmission unit in parallel;
the through type electric energy transmission unit comprises an electric element with a mechanical breakpoint;
the output unit also comprises two groups of input terminals and is respectively connected with the output ends of the isolated electric energy transmission unit and the straight-through electric energy transmission unit;
the controller includes: the system comprises a direct current voltage acquisition circuit, an alternating current voltage acquisition circuit, a direct current acquisition circuit, an alternating current acquisition circuit, a state input acquisition circuit, an output and control circuit and a central control circuit;
the input ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the input unit, and the output ends of the direct current voltage acquisition circuit, the alternating current voltage acquisition circuit, the direct current acquisition circuit and the alternating current acquisition circuit are respectively connected with the output unit;
the state input acquisition circuit is connected with the isolated electric energy transmission unit;
the output and control circuit is connected with the straight-through type electric energy transmission unit;
the central control circuit is used for coordinating the operation of each unit.
2. A feeder fault isolation apparatus for an online dc power supply system as claimed in claim 1, wherein:
the isolated electric energy transmission unit comprises at least one isolated DC/DC device;
the through type electric energy transmission unit comprises at least one breaker, and/or contactor, and/or relay, and/or isolating switch, and/or solid-state switch.
3. An operation method of the on-line direct current power supply system feeder fault isolation device based on claim 1 is characterized by comprising the following steps:
step 1) closing mechanical breakpoints of electrical elements contained in the straight-through type electric energy transmission unit to enable electric energy of the input unit to flow through the straight-through type electric energy transmission unit;
step 2) collecting the current Io of the output unit;
step 3) decomposing an alternating current component Ioac of the current Io;
step 4) comparing the alternating current component Ioac with a set threshold value Ioacs, and if Ioac is larger than or equal to Ioacs, disconnecting mechanical breakpoints of electrical elements contained in the straight-through type electric energy transmission unit, otherwise, turning to step 2);
step 5) after the mechanical breakpoints of the electrical elements contained in the straight-through type electric energy transmission unit are disconnected, enabling the electric energy of the input unit to flow through the isolation type electric energy transmission unit and sending an alarm signal;
step 6) waiting for reset.
4. The method of operation of claim 3, wherein:
in the step 4, a remote instruction and/or a local instruction can be set to forcibly disconnect the mechanical breakpoints of the electrical elements contained in the through type electric energy transmission unit;
the remote instruction is sent by a wired communication circuit or a wireless communication circuit;
the in-place instruction is sent through a control of the operating device.
CN202110304623.8A 2021-03-23 2021-03-23 Online direct-current power supply system feeder fault isolation device and operation method thereof Pending CN112838679A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110304623.8A CN112838679A (en) 2021-03-23 2021-03-23 Online direct-current power supply system feeder fault isolation device and operation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110304623.8A CN112838679A (en) 2021-03-23 2021-03-23 Online direct-current power supply system feeder fault isolation device and operation method thereof

Publications (1)

Publication Number Publication Date
CN112838679A true CN112838679A (en) 2021-05-25

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ID=75930445

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110304623.8A Pending CN112838679A (en) 2021-03-23 2021-03-23 Online direct-current power supply system feeder fault isolation device and operation method thereof

Country Status (1)

Country Link
CN (1) CN112838679A (en)

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