CN114640093B - Method and device for protecting broken line of distributed power transmission and distribution line - Google Patents

Method and device for protecting broken line of distributed power transmission and distribution line Download PDF

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Publication number
CN114640093B
CN114640093B CN202210168116.0A CN202210168116A CN114640093B CN 114640093 B CN114640093 B CN 114640093B CN 202210168116 A CN202210168116 A CN 202210168116A CN 114640093 B CN114640093 B CN 114640093B
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disconnection
protection
state quantity
disconnection protection
phase voltage
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CN114640093A (en
Inventor
柴静波
李春久
庄乾鑫
张发俊
翟永成
候吉硕
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Beijing Skypower Electric Technology Co ltd
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Beijing Skypower Electric Technology Co ltd
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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
    • H02H7/263—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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • 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
    • 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

Abstract

The invention provides a method and a device for protecting the broken line of a distributed power transmission and distribution line.A broken line protection device is respectively arranged at two ends of the power transmission and distribution line, and the broken line protection device acquires the broken line protection action quantity of a local terminal, transmits the broken line protection action quantity of the local terminal to a broken line protection device at an opposite terminal and receives the broken line protection action quantity of the opposite terminal transmitted by the broken line protection device at the opposite terminal; and judging whether the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity meet the disconnection protection equation set, if so, carrying out disconnection protection action opening operation, obtaining disconnection cutting information or disconnection isolation information according to the phase voltage state quantity, and uploading the disconnection cutting information or disconnection isolation information to a background or a scheduling master station. The power transmission and distribution line disconnection fault detection device can correctly distinguish normal operation and disconnection faults of the power transmission and distribution line, does not require synchronous sampling of the disconnection protection device, prevents the disconnection protection from misoperation when any terminal voltage transformer or current transformer is disconnected, can quickly and reliably complete cutting and isolation of the disconnection section of the power transmission and distribution line, and improves reliability of power supply.

Description

Method and device for protecting broken line of distributed power transmission and distribution line
Technical Field
The invention mainly relates to the field of power transmission and distribution line protection control of a power system, in particular to a method and a device for protecting a distributed power transmission and distribution line from being broken.
Background
The lines for transmitting electric energy between the power plant to the substation, between the substation and the distribution station (switchyard), and between the distribution station and the box transformer are called transmission and distribution lines. Because of reasons such as mechanical external force, strong wind, thunderbolt and ageing, can take place single-phase, two-phase or three-phase broken string trouble of transmission and distribution lines, influence electric power system's normal operating, the electrified circuit falls to the ground and also causes bodily injury easily, consequently in time discovers transmission and distribution lines broken string trouble and cuts off and keep apart the trouble very necessary. At present, the following problems exist in the prior art:
1. at present, generally, the asymmetric components are utilized, and zero sequence, negative sequence voltage, current and other protections are set as criteria of line break faults of the power transmission and distribution line, and when the line break condition of a voltage transformer or a current transformer occurs due to non-full-phase operation or light load, the line break faults of the power transmission and distribution line cannot be reliably identified by the protections, so that the fault amplification is caused, and the power supply reliability is influenced.
2. The method for identifying the broken line fault of the power transmission and distribution line is not rapid and reliable, and the broken line section of the power transmission and distribution line cannot be rapidly cut and isolated.
Disclosure of Invention
The invention provides a method and a device for protecting a distributed power transmission and distribution line from being broken aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: the method for protecting the broken line of the distributed power transmission and distribution line comprises the following steps that broken line protection devices are respectively arranged at two ends of the power transmission and distribution line, and the broken line protection devices execute the following steps:
acquiring local terminal disconnection protection action quantity, transmitting the local terminal disconnection protection action quantity to an opposite terminal disconnection protection device, and receiving the opposite terminal disconnection protection action quantity transmitted by the opposite terminal disconnection protection device, wherein the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity respectively comprise phase voltage state quantity, phase current state quantity, switch closing position and disconnection protection input state quantity;
judging whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount meet a disconnection protection equation set or not, if so, performing disconnection protection action and opening operation, otherwise, performing disconnection protection;
and if the phase voltage state quantity meets the line break protection equation set, obtaining line break cutting information or line break isolation information according to the phase voltage state quantity, and uploading the line break cutting information or the line break isolation information to a background or a scheduling main station.
Another technical solution of the present invention for solving the above technical problems is as follows: the broken line protection device for the distributed power transmission and distribution line comprises an acquisition module and a processing module,
the acquisition module is used for acquiring local terminal disconnection protection action quantity, transmitting the local terminal disconnection protection action quantity to an opposite terminal disconnection protection device and receiving an opposite terminal disconnection protection action quantity transmitted by the opposite terminal disconnection protection device, wherein the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity respectively comprise a phase voltage state quantity, a phase current state quantity, a switch on position and a disconnection protection input state quantity;
the processing module is used for judging whether a line break protection equation set is met or not according to the local terminal line break protection action quantity and the opposite terminal line break protection action quantity, if so, performing line break protection action opening operation, otherwise, performing line break protection without action;
and if the phase voltage state quantity meets the line break protection equation set, obtaining line break cutting information or line break isolation information according to the phase voltage state quantity, and uploading the line break cutting information or the line break isolation information to a background or a scheduling main station.
The invention has the beneficial effects that: the line breaking protection device is arranged at two ends of the power transmission and distribution line, the line breaking protection device is used for acquiring the line breaking protection action amount of the local end and receiving the line breaking protection action amount of the opposite end, the line breaking protection device judges whether the line breaking protection action amount of the local end and the line breaking protection action amount of the opposite end meet a line breaking protection equation set or not, normal operation and line breaking faults of the power transmission and distribution line can be correctly distinguished, sampling synchronization of the line breaking protection device is not required, line breaking protection is not mistakenly operated when any terminal voltage mutual inductor or current mutual inductor breaks, cutting and isolation of a line breaking section of the power transmission and distribution line can be quickly and reliably completed, and power supply reliability is improved.
Drawings
Fig. 1 is a schematic flow chart of a disconnection protection method according to an embodiment of the present invention;
fig. 2 is a block diagram of a disconnection protection device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a single-ended power supply transmission and distribution circuit according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1:
fig. 1 is a schematic flow chart of a disconnection protection method according to an embodiment of the present invention.
As shown in fig. 1, in a method for protecting a distributed power transmission and distribution line from a disconnection, disconnection protection devices are respectively arranged at two ends of the power transmission and distribution line, and the disconnection protection devices execute the following steps:
acquiring local terminal disconnection protection action quantity, transmitting the local terminal disconnection protection action quantity to an opposite terminal disconnection protection device, and receiving the opposite terminal disconnection protection action quantity transmitted by the opposite terminal disconnection protection device, wherein the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity respectively comprise phase voltage state quantity, phase current state quantity, switch closing position and disconnection protection input state quantity;
judging whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount meet a disconnection protection equation set or not, if so, performing disconnection protection action and opening operation, otherwise, performing disconnection protection;
and if the phase voltage state quantity meets the line break protection equation set, obtaining line break cutting information or line break isolation information according to the phase voltage state quantity, and uploading the line break cutting information or the line break isolation information to a background or a scheduling main station.
In the above embodiment, the line break protection devices are arranged at two ends of the power transmission and distribution line, the line break protection device collects the line break protection action amount of the local end and receives the line break protection action amount of the opposite end, and the line break protection device judges whether the line break protection action amount of the local end and the line break protection action amount of the opposite end meet the line break protection equation set, so that normal operation and line break faults of the power transmission and distribution line can be correctly distinguished, sampling synchronization of the line break protection device is not required, when any terminal voltage transformer or current transformer breaks, line break protection is not mistakenly operated, cutting and isolation of a line break section of the power transmission and distribution line can be quickly and reliably completed, and power supply reliability is improved.
Preferably, the acquiring the local terminal disconnection protection action amount specifically includes:
calculating to obtain the effective value of the phase voltage according to the Fourier algorithm (or the Fuji algorithm)
Figure BDA0003517412950000041
Effective value of sum phase current>
Figure BDA0003517412950000042
If said phase voltage has a valid value>
Figure BDA0003517412950000043
If the voltage is greater than the phase voltage set value (0.8 times of rated voltage), the phase voltage state quantity is greater than or equal to>
Figure BDA0003517412950000044
Otherwise, the phase voltage status quantity->
Figure BDA0003517412950000045
If the phase current has an effective value>
Figure BDA0003517412950000046
If it is greater than the phase current setpoint value (0.04 times rated current), the phase current status quantity is greater than or equal to>
Figure BDA0003517412950000047
Is->
Figure BDA0003517412950000048
Otherwise, the phase current state quantity->
Figure BDA0003517412950000049
Acquiring an input amount, determining whether a switch is in a closed position or not according to the input amount, if so, switching the closed position S =1, and otherwise, switching the closed position S =0;
if the disconnection protection is put in, the disconnection protection putting state quantity C =1, otherwise, the disconnection protection putting state quantity C =0.
In the above embodiment, the effective value of the phase voltage can be obtained
Figure BDA00035174129500000410
Effective value of sum phase current>
Figure BDA00035174129500000411
And obtaining phase voltage state quantity and phase current state quantity in the disconnection protection action quantity through the phase voltage set value and the phase current set value.
Preferably, the judging whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount satisfy the disconnection protection equation set or not according to the judgment result, if so, performing disconnection protection action opening operation, otherwise, performing disconnection protection without action, specifically:
setting the local end and the opposite end of the power transmission and distribution line as an m end and an n end, and converting the phase voltage state quantity of the m end into a phase voltage state quantity
Figure BDA0003517412950000051
Phase voltage state quantity connected with the n terminal>
Figure BDA0003517412950000052
The sum is taken and the phase current status magnitude of the m terminal is greater than>
Figure BDA0003517412950000053
And phase current state quantity of the n terminal>
Figure BDA0003517412950000054
Summing, summing the switch on-position Sm of the m terminal and the switch on-position Sn of the n terminal, summing the line break protection on-state quantity Cm of the m terminal and the line break protection on-state quantity Cn of the n terminal, wherein>
Figure BDA0003517412950000055
Representing any one of the three phases of the power transmission and distribution line;
if each summation result meets the disconnection protection equation set, performing disconnection protection action and opening operation, otherwise, performing disconnection protection without action, wherein the disconnection protection equation set is as follows:
Figure BDA0003517412950000056
it should be understood that when the state quantities of the phase voltage, the phase current and the like of the m-terminal or n-terminal protection device meet the line break protection equation set, the line break protection action is switched off after 0.5 second delay, and the line break cutting information or the line break isolation information is sent to the line break protection device.
Specifically, the delay time is 0.5 seconds or 1 second.
In the embodiment, normal operation and disconnection faults of the power transmission and distribution line can be correctly distinguished through the disconnection protection equation set, sampling synchronization of the protection device is not required, and disconnection protection is not mistakenly operated when any terminal voltage transformer or current transformer is disconnected.
Preferably, if the line break protection equation set is satisfied, obtaining line break removal information or line break isolation information according to the phase voltage state quantity, and uploading the line break removal information or the line break isolation information to a background or a scheduling master station, specifically:
if the line break protection equation set is satisfied, and the phase voltage state quantity
Figure BDA0003517412950000057
Obtaining the information of the disconnection and the disconnection, and uploading the information of the disconnection and the disconnection to a background or a scheduling master station; />
If the line break protection equation set is satisfied, and the phase voltage state quantity
Figure BDA0003517412950000061
And obtaining the disconnection isolation information and uploading the disconnection isolation information to a background or a scheduling master station.
In the embodiment, the cutting and the isolation of the broken line section of the power transmission and distribution line can be completed quickly and reliably.
The following application description takes a single-ended power supply transmission and distribution line as an example:
the local end and the opposite end of the power transmission and distribution line are set as an m end and an n end. And the m end and the n end are all substations.
When the state quantities of phase voltage, phase current and the like of the m-end or n-end protection device meet the equation set of the invention, the disconnection protection action is switched off after 0.5 second delay, and the protection device sends disconnection cutting or disconnection isolation information.
In this embodiment, the disconnection protection device supports GOOSE services of DL/T860.81 part 8-1 of DL/T860 transformer substation communication network and system.
The two break line protection devices at two ends receive and transmit GOOSE information (phase voltage, phase current state quantity, switch closing position and break line protection input state) through an optical fiber Ethernet.
Fig. 3 is a schematic diagram of a single-ended power supply transmission and distribution circuit according to an embodiment of the present invention.
As shown in fig. 3, the two-end switch is put into on-position and off-line protection:
1) And (4) normal operation:
Figure BDA0003517412950000062
Sm＝1、Cm＝1；
Figure BDA0003517412950000063
Sn＝1、Cn＝1；
the disconnection protection equation set formula (1):
Figure BDA0003517412950000064
the disconnection protection equation set formula (2):
Figure BDA0003517412950000065
both ends do not satisfy the conditions of the broken line protection equation set, and the broken line protection does not act. Wherein the content of the first and second substances,
Figure BDA0003517412950000066
represents any of the three phases A, B, C.
2) If the A phase of the power transmission and distribution line between the m end and the n end has a line break fault:
GmuA＝1、GmiA＝0、Sm＝1、Cm＝1；
GnuA＝0、GniA＝0、Sn＝1、Cn＝1；
the disconnection protection equation set formula (1): gmuA + GnuA =1;
the disconnection protection equation set formula (2): gmiA + GniA =0;
the disconnection protection equation set formula (3): sm + Sn =2;
the disconnection protection equation set formula (4): cm + Cn =2;
the protection devices at the m end and the n end both meet the broken line protection action equation set, and the broken line protection actions at the m end and the n end are separated after 0.5 second delay. Wherein the content of the first and second substances,
Figure BDA0003517412950000071
represents any of the three phases A, B, C.
And (5) sending disconnection and excision information to the protection device at the m end GmuA = 1.
And the n terminal GnuA =0, and the protection device sends disconnection isolation information.
And the phases B and C of the power transmission and distribution line between the m and n of the transformer substation do not meet the broken line protection action equation set at the m end and the n end in normal operation.
Example 2:
fig. 2 is a block diagram of a disconnection protection device according to an embodiment of the present invention.
As shown in fig. 2, the disconnection protection device for distributed power transmission and distribution lines is arranged at two ends of the power transmission and distribution lines, and comprises an acquisition module and a processing module,
the acquisition module is used for acquiring local terminal disconnection protection action quantity, transmitting the local terminal disconnection protection action quantity to an opposite terminal disconnection protection device and receiving an opposite terminal disconnection protection action quantity transmitted by the opposite terminal disconnection protection device, wherein the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity respectively comprise a phase voltage state quantity, a phase current state quantity, a switch on position and a disconnection protection input state quantity;
the processing module is used for judging whether a line break protection equation set is met or not according to the local terminal line break protection action quantity and the opposite terminal line break protection action quantity, if so, performing line break protection action opening operation, and otherwise, performing line break protection without action;
and if the phase voltage state quantity meets the line break protection equation set, obtaining line break cutting information or line break isolation information according to the phase voltage state quantity, and uploading the line break cutting information or the line break isolation information to a background or a scheduling main station.
Preferably, in the acquisition module, the acquisition of the local terminal disconnection protection action amount specifically includes:
calculating to obtain the effective value of the phase voltage according to the Fourier algorithm
Figure BDA0003517412950000081
Effective value of sum phase current>
Figure BDA0003517412950000082
If said phase voltage has a valid value>
Figure BDA0003517412950000083
If the voltage is greater than the set value of the phase voltage (0.8 times of rated voltage), the phase voltage state quantity is greater than>
Figure BDA0003517412950000084
Otherwise, the phase voltage status amount>
Figure BDA0003517412950000085
If said phase current has an effective value>
Figure BDA0003517412950000086
Greater than the phase current setpoint value (0.04 times the setpoint current), the phase current status quantity->
Figure BDA0003517412950000087
Is->
Figure BDA0003517412950000088
Otherwise, the phase current state quantity->
Figure BDA0003517412950000089
Acquiring an input amount, and determining whether a switch is in a closed position or not according to the input amount, wherein if the switch is in the closed position, the closed position of the switch is S =1, and otherwise, the closed position of the switch is S =0;
if the disconnection protection is put in, the disconnection protection putting state quantity C =1, otherwise, the disconnection protection putting state quantity C =0.
Preferably, in the processing module, according to the judgment whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount satisfy the disconnection protection equation set, if yes, performing disconnection protection action opening operation, otherwise, the disconnection protection does not act, specifically:
setting the local end and the opposite end of the power transmission and distribution line as an m end and an n end, and converting the phase voltage state quantity of the m end into a phase voltage state quantity
Figure BDA00035174129500000810
Phase voltage state quantity connected with the n terminal>
Figure BDA00035174129500000811
The sum is taken and the phase current status magnitude of the m terminal is greater than>
Figure BDA00035174129500000812
And phase current state quantity of the n terminal>
Figure BDA00035174129500000813
Summing, summing the switch on-position Sm at the m end and the switch on-position Sn at the n end, summing the disconnection protection on-state quantity Cm at the m end and the disconnection protection on-state quantity Cn at the n end, wherein, the sum is greater than or equal to>
Figure BDA00035174129500000814
Representing any one of the three phases of the transmission and distribution line;
if each summation result meets the disconnection protection equation set, performing disconnection protection action and opening operation, otherwise, performing disconnection protection without action, wherein the disconnection protection equation set is as follows:
Figure BDA00035174129500000815
preferably, in the processing module, if the line break protection equation set is satisfied, line break removal information or line break isolation information is obtained according to the phase voltage state quantity, and the line break removal information or the line break isolation information is uploaded to a background or a scheduling master station, specifically:
if the line break protection equation set is satisfied and the phase voltage state quantity
Figure BDA0003517412950000091
Obtaining the information of the disconnection and the disconnection, and uploading the information of the disconnection and the disconnection to a background or a scheduling master station;
if the line break protection equation set is satisfied, and the phase voltage state quantity
Figure BDA0003517412950000092
And obtaining the disconnection isolation information and uploading the disconnection isolation information to a background or a scheduling master station.
Preferably, the disconnection protection devices at the two ends of the power transmission and distribution line establish connection through an optical fiber ethernet network, and transmit and receive disconnection protection action amount through the optical fiber ethernet network.
Preferably, the disconnection protection devices at the two ends of the power transmission and distribution line are respectively connected with the designated terminal through an optical fiber Ethernet, and the disconnection cutting information or the disconnection isolation information is uploaded to the background or the dispatching master station through the optical fiber Ethernet.
The data connection relation between the disconnection protection devices and the specified terminal can be established quickly and stably.
The advantages of the invention include:
1. the line break protection equation set can correctly distinguish normal operation and line break faults of the power transmission and distribution line.
2. The disconnection protection equation set does not require sampling synchronization of the protection device.
3. When any one of the voltage transformers or the current transformers is disconnected, the disconnection protection is not operated by mistake.
4. The line break protection equation set can rapidly and reliably complete the cutting and isolation of the line break section of the power transmission and distribution line.
The above embodiments are only for illustrating the technical solutions of the present application and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that.
After reading this application, those skilled in the art will be able to make various changes, modifications and equivalents to the embodiments of the application, which are intended to be included within the scope of the present invention.

Claims (8)

1. The method for protecting the broken line of the distributed power transmission and distribution line is characterized in that broken line protection devices are respectively arranged at two ends of the power transmission and distribution line, and the broken line protection devices execute the following steps:
acquiring local terminal disconnection protection action quantity, transmitting the local terminal disconnection protection action quantity to an opposite terminal disconnection protection device, and receiving the opposite terminal disconnection protection action quantity transmitted by the opposite terminal disconnection protection device, wherein the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity respectively comprise phase voltage state quantity, phase current state quantity, switch closing position and disconnection protection input state quantity;
judging whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount meet a disconnection protection equation set or not, if so, performing disconnection protection action and opening operation, otherwise, performing disconnection protection; judging whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount meet the disconnection protection equation set or not according to the judgment, if so, performing disconnection protection action opening operation, otherwise, performing disconnection protection without action, specifically:
setting the local end and the opposite end of the power transmission and distribution line as an m end and an n end, and converting the phase voltage state quantity of the m end into a phase voltage state quantity
Figure FDA0003982490510000011
Phase voltage state quantity of n terminal
Figure FDA0003982490510000012
Summing, and calculating phase current state quantity of m ends
Figure FDA0003982490510000013
Phase current state quantity of n terminal
Figure FDA0003982490510000014
Summing, summing the switch on position Sm of the m end and the switch on position Sn of the n end, summing the disconnection protection on state quantity Cm of the m end and the disconnection protection on state quantity Cn of the n end,
Figure FDA0003982490510000015
representing any one of the three phases of the power transmission and distribution line;
if each summation result meets the disconnection protection equation set, performing disconnection protection action and opening operation, otherwise, performing disconnection protection without action, wherein the disconnection protection equation set is as follows:
Figure FDA0003982490510000016
and if the phase voltage state quantity meets the line break protection equation set, obtaining line break cutting information or line break isolation information according to the phase voltage state quantity, and uploading the line break cutting information or the line break isolation information to a background or a scheduling main station.
2. The disconnection protection method according to claim 1, wherein the collecting of the local terminal disconnection protection action amount specifically comprises:
calculating to obtain the effective value of the phase voltage according to the Fourier algorithm
Figure FDA0003982490510000021
Effective value of sum phase current
Figure FDA0003982490510000022
If the phase voltage has an effective value
Figure FDA0003982490510000023
When the phase voltage is larger than the phase voltage set value, the phase voltage state quantity
Figure FDA0003982490510000024
Otherwise, the phase voltage state quantity
Figure FDA0003982490510000025
If the phase current has an effective value
Figure FDA0003982490510000026
If the phase current state quantity is larger than the phase current set value
Figure FDA0003982490510000027
Is composed of
Figure FDA0003982490510000028
Otherwise, phase current state quantity
Figure FDA0003982490510000029
Acquiring an input amount, determining whether a switch is in a closed position or not according to the input amount, if so, switching the closed position S =1, and otherwise, switching the closed position S =0;
if the disconnection protection is put in, the disconnection protection putting state quantity C =1, otherwise, the disconnection protection putting state quantity C =0.
3. The disconnection protection method according to claim 1 or 2, wherein if the disconnection protection equation set is satisfied, disconnection cutting information or disconnection isolation information is obtained according to the phase voltage state quantity, and the disconnection cutting information or the disconnection isolation information is sent to a background or a scheduling master station, specifically:
if the line break protection equation set is satisfied and the phase voltage state quantity
Figure FDA00039824905100000210
Obtaining the information of the disconnection and the disconnection, and uploading the information of the disconnection and the disconnection to a background or a scheduling master station;
if the line break protection equation set is satisfied, and the phase voltage state quantity
Figure FDA00039824905100000211
And obtaining the disconnection isolation information and uploading the disconnection isolation information to a background or a scheduling master station.
4. The broken line protection device of the distributed power transmission and distribution line is characterized in that the broken line protection devices are respectively arranged at two ends of the power transmission and distribution line and comprise an acquisition module and a processing module,
the acquisition module is used for acquiring local terminal disconnection protection action quantity, transmitting the local terminal disconnection protection action quantity to an opposite terminal disconnection protection device and receiving an opposite terminal disconnection protection action quantity transmitted by the opposite terminal disconnection protection device, wherein the local terminal disconnection protection action quantity and the opposite terminal disconnection protection action quantity respectively comprise a phase voltage state quantity, a phase current state quantity, a switch on position and a disconnection protection input state quantity;
the processing module is used for judging whether a line break protection equation set is met or not according to the local terminal line break protection action quantity and the opposite terminal line break protection action quantity, if so, performing line break protection action opening operation, and otherwise, performing line break protection without action; in the processing module, according to the judgment, whether the local terminal disconnection protection action amount and the opposite terminal disconnection protection action amount meet a disconnection protection equation set, if so, performing disconnection protection action opening operation, otherwise, performing disconnection protection without action, specifically:
setting the local end and the opposite end of the power transmission and distribution line as an m end and an n end, and converting the phase voltage state quantity of the m end into a phase voltage state quantity
Figure FDA0003982490510000031
Phase voltage state quantity of n terminal
Figure FDA0003982490510000032
Summing, and measuring the phase current state quantities of m terminals
Figure FDA0003982490510000033
Phase current state quantity of n terminal
Figure FDA0003982490510000034
Summing, summing the switch on position Sm at the m end and the switch on position Sn at the n end, summing the disconnection protection on-state quantity Cm at the m end and the disconnection protection on-state quantity Cn at the n end, wherein,
Figure FDA0003982490510000035
representing any one of the three phases of the transmission and distribution line;
if each summation result meets the disconnection protection equation set, performing disconnection protection action and opening operation, otherwise, performing disconnection protection without action, wherein the disconnection protection equation set is as follows:
Figure FDA0003982490510000036
and if the phase voltage state quantity meets the line break protection equation set, obtaining line break cutting information or line break isolation information according to the phase voltage state quantity, and uploading the line break cutting information or the line break isolation information to a background or a scheduling main station.
5. The disconnection protection device according to claim 4, wherein the acquisition module acquires a local disconnection protection action amount, and specifically includes:
calculating to obtain the effective value of the phase voltage according to the Fourier algorithm
Figure FDA0003982490510000037
Effective value of sum phase current
Figure FDA0003982490510000038
If the phase voltage has an effective value
Figure FDA0003982490510000039
When the phase voltage is larger than the phase voltage set value, the phase voltage state quantity
Figure FDA00039824905100000310
Otherwise, the phase voltage state quantity
Figure FDA00039824905100000311
If the phase current effective value
Figure FDA00039824905100000312
If the phase current state quantity is larger than the phase current set value
Figure FDA0003982490510000041
Is composed of
Figure FDA0003982490510000042
Otherwise, phase current state quantity
Figure FDA0003982490510000043
Acquiring an input amount, determining whether a switch is in a closed position or not according to the input amount, if so, switching the closed position S =1, and otherwise, switching the closed position S =0;
if the disconnection protection is put in, the disconnection protection putting state quantity C =1, otherwise, the disconnection protection putting state quantity C =0.
6. The disconnection protection device according to claim 4 or 5, wherein in the processing module, if a disconnection protection equation set is satisfied, disconnection cutting information or disconnection isolation information is obtained according to the phase voltage state quantity, and the disconnection cutting information or the disconnection isolation information is uploaded to a background or a scheduling master station, specifically:
if the system of line break protection equations is satisfied,and the phase voltage state quantities
Figure FDA0003982490510000044
Obtaining the information of the disconnection and the disconnection, and uploading the information of the disconnection and the disconnection to a background or a scheduling master station;
if the line break protection equation set is satisfied, and the phase voltage state quantity
Figure FDA0003982490510000045
And obtaining the disconnection isolation information and uploading the disconnection isolation information to a background or a scheduling master station.
7. The disconnection protection device of claim 4 or 5, wherein the disconnection protection devices at both ends of the power transmission and distribution line are connected through an optical fiber Ethernet network, and perform transmission and reception of the disconnection protection operation amount through the optical fiber Ethernet network.
8. The disconnection protection device of claim 4 or 5, wherein the disconnection protection devices at two ends of the power transmission and distribution line are respectively connected with the designated terminal through the optical fiber Ethernet, and the disconnection cutting information or the disconnection isolation information is uploaded to the background or the dispatching master station through the optical fiber Ethernet.
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