CN110148928A - A kind of dotted network reverse-power protection method containing DERs based on forward-order current phase bit comparison - Google Patents
A kind of dotted network reverse-power protection method containing DERs based on forward-order current phase bit comparison Download PDFInfo
- Publication number
- CN110148928A CN110148928A CN201910462325.4A CN201910462325A CN110148928A CN 110148928 A CN110148928 A CN 110148928A CN 201910462325 A CN201910462325 A CN 201910462325A CN 110148928 A CN110148928 A CN 110148928A
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- Prior art keywords
- inlet wire
- protection
- phase difference
- power
- reverse
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- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/265—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents responsive to phase angle between voltages or between currents
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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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of methods that forward-order current phase comparison expression contains distributed generation resource (Distributed Energy Resources, DERs) dotted network reverse-power protection.This method distinguishes power caused by failure and DERs power output waveform using the jump-value of current in ms grades and send phenomenon, as the standard for judging system running state, starting protection element；Abort situation is identified using forward-order current phase bit comparison, the quick cut-off breaker of energy, isolated fault when upstream is broken down at protection.This method allows system to there is inverse probability under normal operation, can be effectively improved the performance of reverse-power protection and raising can significantly improve the access capacity of DER.
Description
Technical field
The present invention relates to the dotted network relay protection fields containing distributed generation resource, the in particular to method of reverse-power protection.
Background technique
Low pressure multi-source and the dotted network supplied can effectively solve source side event as a kind of special low-voltage distribution structure
Barrier causes persistently with power cut problem in short-term, is the most reliable and the most flexible power supply mode generally acknowledged at present.The dotted net of tradition
Network is the load point for preventing each electric power incoming line due to the voltage of equivalent source, the equivalent impedance difference of electric power incoming line and medium voltage side
There is unbalanced situation of contributing in the reasons such as cloth is uneven, and are configured with reverse-power protection in low-pressure side.When protection detects inverse function
It is acted when rate, tripping short-circuiting device.Traditional reverse-power protection is used as the main protection of upstream generation short trouble simultaneously, according to
The 0.1%-0.5% of power system capacity is adjusted, sensitivity with higher.But with the access of distributed generation resource, since its is defeated
Fluctuation and randomness out, under light load and the biggish situation of distributed generation resource power output, traditional reverse-power protection detection
It can be malfunctioned to due to the larger caused inverse probability of distributed generation resource power output, reduce the reliability of dotted network power supply.Mesh
Before, common counter-measure is to limit the power output of DER, is unfavorable for the development of distributed energy power generation technology.
Set forth herein a kind of forward-order current phase comparison expression dotted network reverse-power protection new methods containing distributed generation resource, can
Power is sent caused by inverse probability caused by correct identification failure and DER power output are larger, and dotted network is allowed to operate normally
Under the case where being sent there are power, improve system to the adaptability of Thief zone DER.
Summary of the invention
Technical problem solved by the present invention is being based on jump-value of current and forward-order current phase, constructs and be suitble to Thief zone DER
The reverse-power protection of dotted network guarantees system not malfunction under normal operating conditions, while having when short trouble occurs
Higher sensitivity is realized and quick and precisely identifies abort situation and be isolated.The technical solution particular content taken is as follows:
1. being affected by a natural, the output pulsation period of usual DER is at s grades or more, and electrical quantity caused by failure
Variation is usually completed within ms grades.For the influence for effectively escaping PV power output randomness, it is based on jump-value of current and forward-order current
The reverse-power protection new method of phase distinguishes electrical quantity caused by failure and DER power output waveform using the jump-value of current in ms grades
Variation, when being more than setting valve as the jump-value of current in ms grades of standard that judge system running state, protection starting.
2. based on the reverse-power protection method of jump-value of current and forward-order current phase by carrying out all electric power incoming lines
Label is, it is specified that the positive direction of protection is to be directed toward the direction of low-voltage bus bar from route, after protection starting, just by a certain electric power incoming line
Sequence current phase is to calculate the phase difference of remaining inlet wire Yu inlet wire 1 with reference to inlet wire as reference value, such as inlet wire 1；Provide Si(1 <
I≤n, n are dotted network electric power into number of lines) indicate inlet wire i and 1 phase difference state of inlet wire, if phase difference is in -90 °~90 ° models
In enclosing, then Si=0, if phase difference within the scope of 90 °~270 °, Si=1, each phase difference state S can be obtained2,…,Sn；If
S2,…,SnIt is 1, then judges that short trouble occurs for 1 upstream of inlet wire, reverse-power protection movement disconnects the breaker of inlet wire 1；If
Si(1 < i≤n, n be dotted network electric power into number of lines) is 1, remaining phase difference state is 0, then judges that the upstream inlet wire i is sent out
Raw short trouble, reverse-power protection act, and the breaker on inlet wire i disconnects；If S2,…,SnIt is 0, then judges that fault point does not exist
On any electric power incoming line, reverse-power protection is failure to actuate.
Compared with prior art the beneficial effects of the present invention are:
The dotted network reverse-power protection new method containing distributed generation resource of forward-order current comparison expression disclosed in the invention patent,
Compared with traditional reverse-power protection, there is significant difference:
1. traditional reverse-power protection acts when detecting the 0.1%-0.5% inverse probability of power system capacity.Inverse probability
Appearance the case where being affected by load fluctuation, being easy to appear malfunction when DER access capacity is larger, load is lighter, power supply
Reliability reduces.Reverse-power protection method of this patent based on jump-value of current and forward-order current phase be not by load fluctuation shadow
It rings, it is relatively stable.
2. traditional reverse-power protection is adjusted according to the 0.1%-0.5% of power system capacity, do not consider DER access capacity with
Quantitative relationship between maximum inverse probability.This patent is protected based on the reverse-power protection method of jump-value of current and forward-order current phase
There is biggish inverse probability operation in shield permission system, can significantly improve the access capacity of DER under normal operation.
Detailed description of the invention
Attached drawing 1 is the structure chart of the dotted network containing distributed generation resource
Attached drawing 2 is reverse-power protection action logic figure
Attached drawing 3 is that the dotted network reverse-power protection containing distributed generation resource based on jump-value of current and forward-order current phase is new
The motion characteristic figure of method.
Specific embodiment
The present invention proposes a kind of cable distributor track network fault positioning method based on forward-order current fault component phase bit comparison,
The present invention is described in detail below with reference to the dotted network example and attached drawing of three electric power incoming lines.
1, jump-value of current starts
The structure of the dotted network containing distributed generation resource is as shown in Fig. 1.Jump-value of current in ms grades of protection detection, usually
Jump-value of current of the output pulsation period of DER in s grades or more, ms grades is smaller, is less than setting valve, and protection does not start；And therefore
The variation of electrical quantity caused by hindering usually is completed within ms grades, and jump-value of current is larger, is more than setting valve, protection starting；For row
Except the interference of biggish load starting current, protecting the setting valve mentality of designing of starting is the electricity for escaping maximum threephase load starting
Flow Sudden Changing Rate.
2, electric power incoming line breaks down
The positive direction of regulation protection is that the direction of low-voltage bus bar is directed toward from route, i.e.,WithTo three electricity
Source inlet wire is numbered, and using the forward-order current phase of inlet wire 1 as reference value, calculates the phase of remaining inlet wire with the electric power incoming line
Potential difference is, it is specified that Si(1 i≤3 <) indicate inlet wire i and 1 phase difference state of inlet wire, if phase difference within the scope of -90 °~90 °, Si
=0, if phase difference within the scope of 90 °~270 °, Si=1, a certain electric power incoming line of dotted network can be obtained and break down yes
Forward-order current phase difference feature between other inlet wires and reference inlet wire, i.e. S2,S3.Reverse-power protection action logic figure such as attached drawing 2
It is shown, it is contemplated that communication and forward-order current phase difference calculating need the regular hour, therefore relay starts in jump-value of current
Later, starting state is kept within the regular hour, waits the logical signal of forward-order current phase judgement, time t1By electric current
The start-up criterion algorithm of Sudden Changing Rate influences.2 it can determine whether abort situation, faulty line protection act, isolated fault with reference to the accompanying drawings.
Such as when short trouble occurs for reference inlet wire inlet wire 1, S2=1, S3=1,2 reverse-power protections act with reference to the accompanying drawings
Logic diagram analysis can obtain, 1 reverse-power protection of inlet wire movement, breaker tripping, isolated fault.Inlet wire 2 and inlet wire 3 are non-faulting
Route, protection are failure to actuate, auto-returned after a period of time.
When non-reference inlet wire breaks down, such as when inlet wire 2 breaks down, S2=1, S3=0,2 inverse probability with reference to the accompanying drawings
Protection act logic diagram analysis can obtain, 2 reverse-power protection of inlet wire movement, breaker tripping, isolated fault.Inlet wire 1 and inlet wire 3
For non-fault line, protection is failure to actuate, auto-returned after a period of time.
3, low-voltage bus bar breaks down
When short trouble occurs for low-voltage bus bar, S2=0, S3=0,2 reverse-power protection action logic map analysis can with reference to the accompanying drawings
, low-voltage bus bar breaks down, and reverse-power protection is failure to actuate.
4, the determination method of protection scope
In actual moving process, the phase difference of forward-order current will not strictly observe the principle of 0 ° or 180 °.Current Mutual Inductance
When device electric current side-draw, after static 10% error requirements selection load, two sides secondary current worst error is no more than 7 °；Protection
The angular error of sequence filter and transmitting-receiving letter operation circuit in device is no more than 15 °；Furthermore measurement error, line impedance are unbalanced
Etc. factors can also make the phase difference of forward-order current between inlet wire generate deviation therefore need to set certain nargin, [90 °, 270 °] are
Section is acted, [- 90 °, 90 °] are area of being failure to actuate, as shown in Fig. 3.
Claims (3)
1. a kind of forward-order current comparison expression dotted network reverse-power protection method containing DERs, it is characterised in that: by all power supplys into
Line carry out label, it is specified that protection positive direction be from route be directed toward low-voltage bus bar direction, protection starting after, by a certain power supply into
The forward-order current phase of line is to calculate the phase difference of remaining inlet wire Yu inlet wire 1 with reference to inlet wire as reference value, such as inlet wire 1；Regulation
Si(1 < i≤n, n are dotted network electric power into number of lines) indicates inlet wire i and 1 phase difference state of inlet wire, if phase difference is at -90 °
Within the scope of~90 °, then Si=0, if phase difference within the scope of 90 °~270 °, Si=1, each phase difference state S can be obtained2,…,
Sn；If S2,…,SnIt is 1, then judges that short trouble occurs for 1 upstream of inlet wire, reverse-power protection movement disconnects the open circuit of inlet wire 1
Device；If Si(1 < i≤n, n be dotted network electric power into number of lines) is 1, remaining phase difference state is 0, then judges on inlet wire i
Short trouble occurs for trip, and reverse-power protection acts, and the breaker on inlet wire i disconnects；If S2,…,SnIt is 0, then judges fault point
Not on any electric power incoming line, reverse-power protection is failure to actuate.
2. according to the method described in claim 1, it is characterized by: when short trouble occurs for inlet wire, at failure incoming relay-protection just
Sequence current direction is to flow to fault point from voltage bus, and the forward-order current direction at non-faulting incoming relay-protection is therefrom to press feeder line stream
To low-voltage bus bar；When short trouble occurs with reference to inlet wire 1, the phase difference of remaining inlet wire and inlet wire 1 is in 90 °~270 ° ranges
It is interior；When short trouble occurs for inlet wire i, the phase difference of failure inlet wire i and inlet wire 1 is within the scope of 90 °~270 °, and remaining non-faulting
The phase difference of inlet wire and inlet wire 1 is within the scope of -90 °~90 °.
3. according to the method described in claim 1, it is characterized by: low-voltage bus bar occur short trouble when, remaining inlet wire with into
The phase difference of line 1 within the scope of -90 °~90 °, be failure to actuate by reverse-power protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910462325.4A CN110148928A (en) | 2019-05-30 | 2019-05-30 | A kind of dotted network reverse-power protection method containing DERs based on forward-order current phase bit comparison |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910462325.4A CN110148928A (en) | 2019-05-30 | 2019-05-30 | A kind of dotted network reverse-power protection method containing DERs based on forward-order current phase bit comparison |
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| CN110148928A true CN110148928A (en) | 2019-08-20 |
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| CN201910462325.4A Pending CN110148928A (en) | 2019-05-30 | 2019-05-30 | A kind of dotted network reverse-power protection method containing DERs based on forward-order current phase bit comparison |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780221A (en) * | 2012-07-20 | 2012-11-14 | 上海交通大学 | System and method for controlling online type photovoltaic power generation microgrid without storage device |
| CN103185846A (en) * | 2011-12-31 | 2013-07-03 | 阳光电源股份有限公司 | Countercurrent detection method, anti-countercurrent control method and device and anti-countercurrent system |
| CN109787202A (en) * | 2019-03-21 | 2019-05-21 | 中国石油大学(华东) | A kind of dotted network reverse-power protection method containing DERs in relatively forward-order current direction |
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2019
- 2019-05-30 CN CN201910462325.4A patent/CN110148928A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103185846A (en) * | 2011-12-31 | 2013-07-03 | 阳光电源股份有限公司 | Countercurrent detection method, anti-countercurrent control method and device and anti-countercurrent system |
| CN102780221A (en) * | 2012-07-20 | 2012-11-14 | 上海交通大学 | System and method for controlling online type photovoltaic power generation microgrid without storage device |
| CN109787202A (en) * | 2019-03-21 | 2019-05-21 | 中国石油大学(华东) | A kind of dotted network reverse-power protection method containing DERs in relatively forward-order current direction |
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Application publication date: 20190820 |