CN106385016A - Power distribution network protection system based on limited wide area protection principle and power distribution network protection method thereof - Google Patents

Power distribution network protection system based on limited wide area protection principle and power distribution network protection method thereof Download PDF

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Publication number
CN106385016A
CN106385016A CN201610983137.2A CN201610983137A CN106385016A CN 106385016 A CN106385016 A CN 106385016A CN 201610983137 A CN201610983137 A CN 201610983137A CN 106385016 A CN106385016 A CN 106385016A
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CN
China
Prior art keywords
protection
module
voltage
wide area
distribution network
Prior art date
Application number
CN201610983137.2A
Other languages
Chinese (zh)
Inventor
韩笑
阮广俊
吉宜月
Original Assignee
南京工程学院
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 南京工程学院 filed Critical 南京工程学院
Priority to CN201610983137.2A priority Critical patent/CN106385016A/en
Publication of CN106385016A publication Critical patent/CN106385016A/en

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/28Sectionalised 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

Abstract

The invention discloses a power distribution network protection system based on a limited wide area protection principle. The power distribution network protection system comprises protection devices which are distributed at nodes in a power grid. Each protection device comprises the components of a master control module, an analog quantity acquisition module which is used for acquiring a voltage/current signal at a power grid node where the protection device exists, an action output module which is used for protection control, and a communication module which is used for performing real-time data transmission with other protection devices. The invention further discloses a power distribution network protection method. The power distribution network protection method comprises the steps of acquiring the voltage/current signal at the power grid node where the master control module exists by the master control module, and simultaneously acquiring the voltage/current signals at other power grid nodes through the communication module; analyzing corresponding three-phase current information according to the voltage/current information, calculating a differential current between two power grid nodes, generating a fault information matrix, positioning the fault information according to characteristics of the fault information matrix, and performing a relay protection action through an action output module. The power distribution network protection system and the power distribution network protection method can realize accurate positioning on single-phase grounding faults and quick inter-phase fault elimination.

Description

Distribution protection system based on limited wide area protection principle and its guard method
Technical field
The present invention relates to power protection technology field, protect particularly to a kind of power distribution network based on limited wide area protection principle Protecting system and its guard method.
Background technology
With the development of the every subjects such as communication, computer and intelligent instrument, the wide area relay protection technology of a new generation is just In exploitation and formation.WAMS (WAMS) provides for relay protection and can gather the multiple nodal information of full electric network simultaneously Effective means, thus for realize fault carry out quick, reliable, accurately excise and provide possibility.And conventional electrical distribution net is joined at present Electrical network branch line is numerous, complex structure, though the protective relaying device being configured updates through multiple, does not still enable single-phase earthing Being accurately positioned of fault, nor fully achieve the quick excision of phase-to phase fault, therefore cannot meet security of distribution network and confession The demand of electric reliability.
Content of the invention
It is an object of the invention to overcoming deficiency of the prior art, provide a kind of joining based on limited wide area protection principle Electric network protection system, solving protective relaying device in prior art can not be accurately positioned to fault, nor realizes alternate The technical problem of the quick excision of fault.
What the present invention provided be employed technical scheme comprise that based on the distribution protection system of limited wide area protection principle:Bag Include:It is distributed in the protection device at each node in electrical network;Described protection device includes:Main control module, it is used for gathering protection device The analogue collection module of voltage and current signal, the action output module for protection control, Yi Jiyong at residing grid nodes In the communication module carrying out real-time Data Transmission with other protection devices;Described analogue collection module gathers electrical network residing for itself Voltage and current signal at node, and transmit to main control module, main control module collects other each electrical networks by communication module simultaneously Voltage and current signal at node;Go out corresponding three-phase current information according to voltage x current information analysis, calculate grid nodes two-by-two Between difference current, generate fault message matrix, according to the feature location fault message of fault message matrix, and pass through action Output module executes relay protection action.
Described action output module passes through intake module respectively, the amount of outputing module is connected with main control module, main control module Protection act instruction is issued to action output module by the amount of outputing module, its finger sending is judged by the detection of intake module Whether order is executed.
Described intake module, the amount of outputing module are divided on two circuit boards.
Described analogue collection module sequentially passes through transformator, low-pass filter circuit and AD conversion module and main control module connects Connect.
It is also associated with human-computer interaction module on described main control module.
Present invention also offers a kind of guard method of the distribution protection system based on limited wide area protection principle, bag Include:So that the protection device real-time Communication for Power being distributed at each node of electrical network is connected, set up local communication network;
Protection device gathers the voltage x current information at own node, and collects other protection device institutes by local communication network Voltage x current information at place's node;
Described voltage x current information is parsed, obtains corresponding three-phase current information, calculate respectively two-by-two grid nodes it Between difference current, and generate fault message matrix;
Fault is judged whether according to fault message matrix:If there is no fault, continue to the voltage at each grid nodes Current information carries out Real-time Collection;If there is fault, then the feature location abort situation according to fault message matrix, executes event Barrier protection act.
Before described voltage x current information is parsed, need to carry out half-wave integration calculating to current signal.
Described voltage x current information is according to improvement DL/T667-1999(IEC60870-5-103)Stipulations are parsed.
Compared with prior art, the beneficial effect that the present invention is reached is:By to the voltage electricity in residing distribution line The Real-time Collection of stream signal, and carry out the communications between protection device, judgement is carried out to the signal collecting and makes accordingly Protection act, realize the back-up protection function of power distribution network, and be capable of being accurately positioned and alternate of singlephase earth fault The quick excision of fault.The present invention is applied to the back-up protection of the power distribution network of 10kV electric pressure.
Brief description
Fig. 1 is the circuit of the protection device of the distribution protection system based on limited wide area protection principle that the present invention provides Theory diagram.
Fig. 2 is the main journey of the guard method of the distribution protection system based on limited wide area protection principle that the present invention provides Program flow diagram.
Fig. 3 is to communicate in the guard method of the distribution protection system based on limited wide area protection principle that the present invention provides Flow chart.
Fig. 4 is fault in the guard method of the distribution protection system based on limited wide area protection principle that the present invention provides Positioning flow figure.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention Technical scheme, and can not be limited the scope of the invention with this.
It is around what wide area protection functional realiey was carried out based on the distribution protection system of limited wide area protection principle, except biography Outside the function such as measurement, control, communication in blanket insurance protection unit, also it is integrated with a road RS-485 and controls carrier communication interface, be wide area Communication system provides physical support.The distribution protection system that the present invention provides mainly includes:It is distributed at each node in electrical network Protection device, between each protection device, local area communication network is set up by communication module, constitutes locality protection net.
As shown in figure 1, being the schematic block circuit diagram of protection device, including:Main control module, it is used for gathering residing grid nodes Place voltage and current signal analogue collection module, for protection control action output module and for and other protection Device carries out the communication module of real-time Data Transmission.
Analogue collection module is sequentially passed through transformator, low-pass filter circuit and AD conversion module and is connected with main control module, Analogue collection module gathers the voltage and current signal at itself residing grid nodes, through transformer pressure-reducing, low-pass filtering electricity After the low-pass filtering of road, be converted to the power frequency weak electric signal in the convertible scope of AD conversion module, based on AD conversion module conversion The digital signal that control module can read.
Action output module is passed through intake module, the amount of outputing module respectively and is connected with main control module, intake module, opens Output module is divided on two circuit boards, constitutes a circulation of relay protection action executing, main control module is by the amount of outputing Module issues protection act instruction to action output module, judges whether the instruction that it sends obtains by the detection of intake module Execution.
Human-computer interaction module is also associated with main control module, for parameter setting and presentation of information.
The Machine Design of protection device adopts inserter structure, and shell is aluminum alloy material, and screen is using the completely very color Chinese Change Display Technique, man machine interface is friendly, there is dust-proof, anti-vibration design, be adapted for mount to the environmental conditions such as switch cubicle and more dislike Bad site environment.
The Kinetis 60 that main control module can be released using Freescale company(K60)The micro- place of serial MK60FN1M0VLQ15 Reason device, analogue collection module is used the acp chip as analog digital conversion for the AD7656 of ADI company of the U.S., extends external storage The CY7C1011CV33 external static memorizer being produced using Cypress Semiconductor Co., Ltd, the development system of software section be Under the translation and compiling environment of CodeWarrior Development Studio using C language the MQX operating system based on Freescale Complete.
During the distribution protection system work that the present invention provides, analogue collection module gathers at grid nodes residing for itself Voltage and current signal, after blood pressure lowering, filtering and AD conversion, transmit to main control module, simultaneously main control module pass through communication module Collect the voltage and current signal at other each grid nodes;Go out corresponding three-phase current information according to voltage x current information analysis, meter Calculate the difference current two-by-two between grid nodes, generate fault message matrix, according to the feature location fault of fault message matrix Information, and relay protection action is executed by action output module.
The distribution protection method that the present invention provides is to be realized based on above-mentioned protection system.It is the present invention as shown in Figure 2 The main program flow chart of the guard method providing.After upper electricity, start real time operating system MQX first, and internal clocking, IO are connect Mouth, intervalometer etc. initialize, and check whether a functional module is normally run, and create main task, and complete each in mastery routine The establishment of task process, subsequently into the entirety circulation of task scheduling, specific as follows:
The guard method of the distribution protection system based on limited wide area protection principle, including:
Make the protection device being distributed at each node of electrical network keep real-time Communication for Power to connect, set up local communication network.Main control module Detect whether GPS communication is normal before electric quantity information collection always, if GPS can be believed according to pulse per second (PPS) with proper communication Number gathered data simultaneously receives time scale information, data is stamped markers and transmits wide-area data through RS-485, abnormal in GPS communication In the case of, when mode during standby school that enables is pingpong theory school.As shown in figure 3, being the communication flow diagram of the present invention.
Protection device gathers the voltage x current information at own node, and collects other protection dresses by local communication network Put the voltage x current information at residing node.Consider for the speed that protection act is executed, during algorithms selection, to electricity of being sampled The precise requirements of stream will not be too high, and basic demand is:The process to gathered current signal can quickly be realized calculate.
Voltage x current information is parsed, obtains corresponding three-phase current information, calculate respectively two-by-two grid nodes it Between difference current, and generate fault message matrix.In the present invention, voltage x current information is according to improvement DL/T667-1999 (IEC60870-5-103)Stipulations are parsed, and improve DL/T667-1999(IEC60870-5-103)Stipulations come from existing skill Art books《IEC60870-5 serial protocols application guide》, Wang Shouding chief editor, China Electric Power Publishing House publishes, at the beginning of 2008 5 months Version, including tetra- agreement applications of IEC60870-5-101, IEC60870-5-102, IEC60870-5-103, IEC60870-5-04 Guide.
Fault is judged whether according to fault message matrix:If there is no fault, continue to each grid nodes Voltage x current information carries out Real-time Collection;If there is fault, then the feature location abort situation according to fault message matrix, holds Row fault protection.As shown in figure 4, being the flow chart of fault location of the present invention, in figure main website is to be chosen according to power distribution network A certain protection device in the protection system that position is specified, is mainly used in gather information, and slave station refers to remaining protection in protection system Device, sends information to main website.
In addition it is also necessary to situation be put into according to the pressing plate of protection device determine how protection should dispose event after fault location Barrier.If the protection of protection device wide area differential puts into, after positioning failure, can directly send trip signal, by Fault Isolation, such as The protection of fruit wide area differential does not put into, then display module can be controlled to show fault message, play the purpose of alarm.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art For member, on the premise of without departing from the technology of the present invention principle, some improvement can also be made and deform, these improve and deform Also should be regarded as protection scope of the present invention.

Claims (8)

1. the distribution protection system based on limited wide area protection principle is it is characterised in that include:It is distributed in each node in electrical network The protection device at place;
Described protection device includes:Main control module, the mould for gathering voltage and current signal at grid nodes residing for protection device Analog quantity acquisition module, the action output module controlling for protection and for carrying out real time data biography with other protection devices Defeated communication module;
Described analogue collection module gathers the voltage and current signal at grid nodes residing for itself, and transmits to main control module, Main control module collects the voltage and current signal at other each grid nodes by communication module simultaneously;According to voltage x current information solution Separate out corresponding three-phase current information, calculate the difference current between grid nodes two-by-two, generate fault message matrix, according to fault The feature location fault message of information matrix, and relay protection action is executed by action output module.
2. the distribution protection system based on limited wide area protection principle according to claim 1 is it is characterised in that described Action output module passes through intake module respectively, the amount of outputing module is connected with main control module, and main control module is by the amount of outputing mould Block issues protection act instruction to action output module, judges whether the instruction that it sends is held by the detection of intake module OK.
3. the distribution protection system based on limited wide area protection principle according to claim 2 is it is characterised in that described Intake module, the amount of outputing module are divided on two circuit boards.
4. the distribution protection system based on limited wide area protection principle according to claim 1 is it is characterised in that described Analogue collection module is sequentially passed through transformator, low-pass filter circuit and AD conversion module and is connected with main control module.
5. the distribution protection system based on limited wide area protection principle according to claim 1 is it is characterised in that described Human-computer interaction module is also associated with main control module.
6. the distribution protection system based on limited wide area protection principle any one of a kind of employing claim 1 to 5 Guard method is it is characterised in that include:
So that the protection device real-time Communication for Power being distributed at each node of electrical network is connected, set up local communication network;
Protection device gathers the voltage x current information at own node, and collects other protection device institutes by local communication network Voltage x current information at place's node;
Described voltage x current information is parsed, obtains corresponding three-phase current information, calculate respectively two-by-two grid nodes it Between difference current, and generate fault message matrix;
Fault is judged whether according to fault message matrix:If there is no fault, continue to the voltage at each grid nodes Current information carries out Real-time Collection;If there is fault, then the feature location abort situation according to fault message matrix, executes event Barrier protection act.
7. the guard method of the distribution protection system based on limited wide area protection principle according to claim 6, it is special Levy and be, before described voltage x current information is parsed, need to carry out half-wave integration calculating to current signal.
8. the guard method of the distribution protection system based on limited wide area protection principle according to claim 6, it is special Levy and be, described voltage x current information is according to improvement DL/T667-1999(IEC60870-5-103)Stipulations are parsed.
CN201610983137.2A 2016-11-09 2016-11-09 Power distribution network protection system based on limited wide area protection principle and power distribution network protection method thereof CN106385016A (en)

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Application publication date: 20170208

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