CN106786413A - Current protection method containing distributed photovoltaic power power distribution network - Google Patents
Current protection method containing distributed photovoltaic power power distribution network Download PDFInfo
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- CN106786413A CN106786413A CN201610997679.5A CN201610997679A CN106786413A CN 106786413 A CN106786413 A CN 106786413A CN 201610997679 A CN201610997679 A CN 201610997679A CN 106786413 A CN106786413 A CN 106786413A
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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
Abstract
The present invention provides a kind of current protection method containing distributed photovoltaic power power distribution network, including photovoltaic access point higher level circuit arranges longitudinal differential current protective device and system power supply side configuration I, II, III three-stage adaptive Current Protection device；After power distribution network breaks down, adaptive Current Protection device first determines whether that fault type is line to line fault or three-phase shortcircuit and mutually should determine that fault type COEFFICIENT Kd；Adaptive Current Protection device judges two-phase or three-phase fault and the impedance of protection device dorsal part and dorsal part equivalent source electromotive force；Act setting valve and make corresponding protection act and each longitudinal differential current protective device in line computation I, II, III three section protection and failure judgement direction and make the steps such as corresponding protection act respectively.Guard method of the invention is not influenceed by system operation mode, can ensure that each protection device correct operation, and functional reliability is high.
Description
Technical field
The present invention relates to distribution protection method, and in particular to a kind of suitable for the electricity containing distributed photovoltaic power power distribution network
Stream guard method.
Background technology
Although distributed photovoltaic power grid can improve the stability of system, the use of fossil fuel, meeting are reduced
Existing protection is affected so that current protection traditional in power distribution network occurs malfunction or tripping, therefore, it is right
The hot issue for progressively turning into research both at home and abroad is studied in the protection of the power distribution network accessed containing distributed photovoltaic power.
Parallel network power generation development is very fast, with the access of a large amount of distributed photovoltaic powers so that traditional single supply radiation
Shape power distribution network is changed into the distribution network of many power supplys, and when power distribution network breaks down, the size and Orientation of its short circuit current can occur
Great changes, so as to the current protection mode used to conventional electrical distribution net brings considerable influence so that electricity in conventional electrical distribution net
There is malfunction or tripping in stream protection device, specifically, for the current protective device of distributed power access point upstream, by
In the shunting action of distributed power source, the electric current of inflow current protection device can be reduced, so as to reduce original current protective device
Protection domain, or even make original current protective device that tripping to occur；For the protection in distributed power access point downstream, due to
The increasing that helps of photo-voltaic power supply is acted on, and can increase the electric current for flowing through current protective device, increases its protection domain, it is possible to make protection
Scope extends to next circuit, so that current protective device occurs malfunction.Meanwhile, because photovoltaic generating system does not rotate
Part, hence without the damping action that inertia belt comes, makes it different from the fault characteristic that traditional synchronous motor shows, photovoltaic
Output of the power supply during failure typically remains symmetrical three-phase current, and the capacity of photo-voltaic power supply is smaller than the capacity of system
A lot, this weak mains characteristic can cause the current protective device in conventional electrical distribution net after distributed photovoltaic power is accessed often
It is unable to correct operation.Therefore, the technical problem for existing for the current protection containing distributed photovoltaic power power distribution network, studies and carries
Go out a kind of new more rational current protection method, it appears very necessary.
The content of the invention
The purpose of the present invention is：For the problems of the prior art, there is provided a kind of containing distributed photovoltaic power power distribution network
Current protection method, the method can not be influenceed by system operation mode, it is ensured that current protective device can when breaking down
Correct operation.
The technical scheme is that：Current protection method containing distributed photovoltaic power power distribution network of the invention, its bag
Include following steps：
1. the upper level circuit in photo-voltaic power supply access point sets longitudinal differential current protective device, in the upper level line
The photovoltaic side of the circuit of upper level again of road and the upper level circuit installs breaker additional；In remaining line configuring of system power supply side
I, II, III three-stage adaptive Current Protection device；
2. after power distribution network breaks down, adaptive Current Protection device first determines whether that fault type is line to line fault or three-phase
Short circuit simultaneously mutually should determine that fault type COEFFICIENT Kd；
3. adaptive Current Protection device when adaptive Current Protection device calculates two-phase short-circuit fault using formula (1) is carried on the back
Side impedance Zs；Calculate adaptive Current Protection device dorsal part impedance Z during three phase short circuit fault in real time using formula (2)s：
In formula,It is the negative phase-sequence false voltage of adaptive Current Protection device installation place；For adaptive Current Protection is filled
Put the negative sequence fault current of installation place；
In formula,It is the positive sequence fault component voltage of adaptive Current Protection device installation place；For self-adaptive current is protected
The positive sequence fault component electric current of protection unit installation place；
4. adaptive Current Protection device calculates its dorsal part equivalent source electromotive force using formula (3)
In formula,Failure phase during the failure that respectively adaptive Current Protection device is obtained at protection device
Voltage, faulted phase current,It is A phases, B phases or C phases；
5. adaptive Current Protection device acts setting valve and makes corresponding protection in line computation I, II, III three section protection
Action：
Adaptive Current Protection device is using formula (4) in line computation I sections of protection act setting valve II Z：
In formula：KkIt is safety factor, value 1.1~1.3；KdIt is the fault type coefficient of step 2. middle determination；EsIt is step
4. the protection dorsal part equivalent source electromotive force obtained by；ZsFor step 3. gained protection dorsal part impedance；ZLIt is I sections of protected circuit
Impedance；
If the fault current for flowing through adaptive Current Protection device is more than the I sections of protection act setting valve I for calculatingI Z, then
The exit relay of adaptive Current Protection device instantaneously sends trip signal and breaks to the adaptive Current Protection device is administrative
Road device, makes it trip；
Adaptive Current Protection device is using formula (5) in line computation II sections of protection act setting valve III Z：
In formula,It is safety factor, value 1.1~1.3；KdIt is the fault type coefficient of step 2. middle determination；EsIt is step
The protection dorsal part equivalent source electromotive force of rapid 4. gained；ZsFor step 3. gained protection dorsal part impedance；ZL sheetsIt is this section of circuit resistance
It is anti-；ZUnder LIt is protection next stage circuit impedance；
If the fault current for flowing through adaptive Current Protection device is more than the II sections of setting valve I for calculatingII Z, then self adaptation
The time delay 0.5s actions after a failure of the exit relay of current protective device, send trip signal and are filled to the adaptive Current Protection
Administrative breaker is put, makes it trip；
Adaptive Current Protection device is using formula (6) in line computation III sections of protection act setting valve
In formula,It is safety factor, value 1.1~1.3；KssIt is self-starting coefficient, value 1.2~1.3；KreTo return
Coefficient, value 0.85；IloadTo flow through the Real-time Load electric current of adaptive Current Protection device；
If the fault current for flowing through adaptive Current Protection device is more than the self-adaptive current III sections of setting valve for calculating,
Then the exit relay of adaptive Current Protection device is acted for 0.5 second compared to next level adaptation III sections of time delay after a failure,
Sending trip signal gives the adaptive Current Protection device administrative breaker, makes it trip；If next stage is configured without adaptive
III sections is answered, then time delay 1 second is acted adaptive Current Protection device exit relay after a failure, send trip signal to should be from
The administrative breaker of current protective device is adapted to, makes it trip；
6. each longitudinal differential current protective device difference failure judgement that the upper level circuit two ends of photovoltaic access point arrange
Direction and the exchange judged result that communicates；
If failure judgement is positive direction failure to each longitudinal differential current protective device simultaneously, step is performed 7.；If vertical connection is poor
System power supply side protection device judged result in streaming current protection device is reverse direction failure, performs step 8.；If vertical connection is poor
Photovoltaic electric source protection device failure judgement in streaming current protection device is reverse direction failure, then perform step 9.；
7. the no-delay control of each longitudinal differential current protective device is located at the disconnected of the upper level circuit both sides of photovoltaic access point
Road device tripping operation, isolated fault；
8. each longitudinal differential current protective device failure judgement is located at the lines upstream of the upper level circuit of photovoltaic access point,
The upper level circuit both sides breaker of each Unit protection device locking photovoltaic access point, simultaneity factor mains side is corresponding certainly
The breaker of its administrative close photovoltaic side of current protective device control tripping is adapted to, photo-voltaic power supply electric current is cut off；
9. the upper level circuit both sides breaker of longitudinal differential current protective device locking photovoltaic access point, photovoltaic access point
Upper level circuit the circuit of upper level again in adaptive Current Protection device control the open circuit of its administrative close photovoltaic side
Device does not trip.
Further scheme is, above-mentioned step 2. in, adaptive Current Protection device failure judgement type and determine therefore
Barrier genre modulus KdMethod be：
System side A phase currents after adaptive Current Protection device collection failureWith C phase currentsAnd by following rule
Then judged：
IfThen judge BC line to line fault；
IfThen judge AB line to line fault；
IfThen judge AC line to line fault；
If first three formula is unsatisfactory for, three-phase fault is judged；
Wherein K1Value 0.5；If it is determined that being phase to phase fault, then fault type COEFFICIENT KdValueIf it is determined that being three-phase event
Hinder, then fault type COEFFICIENT KdValue 1.
Further scheme is, above-mentioned step 3. in, the negative phase-sequence false voltage in formula (1)And negative sequence fault currentAnd the positive sequence fault component voltage in formula (2)With positive sequence fault component electric currentCome from：
Adaptive Current Protection device obtains the power frequency false voltage component △ u after failure occurs and power frequency fault current point
Amount △ i；Wherein,
The voltage u of adaptive Current Protection device installation places of the power frequency false voltage component △ u by measuringmBefore subtracting failure
Voltage u under state[0]And obtain；
The electric current i of adaptive Current Protection device installation places of the power frequency fault current component △ i by measuringmBefore subtracting failure
Electric current i under state[0]And obtain.
The present invention has positive effect：(1) it is of the invention for the current protection containing distributed photovoltaic power power distribution network is provided
A kind of new method, the guard method is not influenceed by system operation mode, can line computation protection setting valve, while with light
The size and payload for lying prostrate plant-grid connection capacity are unrelated, and when load and photo-voltaic power supply access capacity change, the protection is equal
Energy correct operation, reliability is higher, and protection domain is bigger；Communication is installed and is set in the transmission line of electricity two ends only accessed in photo-voltaic power supply
It is standby, reduce the dependence to communication equipment；Simultaneously as radial networks of traditional power distribution network for single power supply, so one
As only system side install current protective device, the present invention on the basis of traditional distribution network protection except photo-voltaic power supply access it is defeated
Current protective device is installed at electric line two ends, and remaining transmission line of electricity is only installed a current protective device, compared in system side
System configuration cost is reduced in traditional pilot protection is configured at each section of upstream circuit two ends.
Brief description of the drawings
Fig. 1 is the simulation model schematic diagram containing distributed photovoltaic power power distribution network employed in embodiment, is also shown in figure
Meaning property shows the plan of establishment of the current protective device that current protection method of the present invention is used.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
(embodiment 1)
The current protection method containing distributed photovoltaic power power distribution network of the present embodiment, comprises the following steps：
1. the upper level circuit in photo-voltaic power supply access point sets longitudinal differential current protective device, in the upper level circuit
And the photovoltaic side of the circuit of upper level again of the upper level circuit installs breaker additional；Power distribution network remaining circuit is in system power supply side
Configuration I, II, III three-stage adaptive Current Protection device.
So-called upper level circuit and again upper level circuit, refer near and closer to the circuit of system power supply.
2. after system jam, adaptive Current Protection device first determines whether that fault type is that line to line fault or three-phase are short
Road is determining corresponding fault type COEFFICIENT Kd：
System side A phase currents after adaptive Current Protection device collection failureWith C phase currentsAnd by following rule
Then judged：
IfThen judge BC line to line fault；IfThen judge AB line to line fault；IfThen judge AC line to line fault；If first three formula is unsatisfactory for, three-phase fault is judged；
Wherein K1Value 0.5；If it is determined that being phase to phase fault, then fault type COEFFICIENT KdValueThe event if three-phase fault
Barrier genre modulus KdValue 1.
3. adaptive Current Protection device is counted in real time using power frequency false voltage component △ u, power frequency fault current component △ i
Calculate protection device dorsal part impedance Zs, power frequency fault component voltage △ u and power frequency fault component electric current △ i be defined as power system hair
During raw failure, the voltage u that protection device installation place measuresm, electric current imIt is individually subtracted voltage u under pre-fault status[0], electric current i[0]Resulting voltage, the magnitude of current；.In isolated neutral power distribution network, power frequency fault component voltage △ u are by positive-sequence component electricity
PressureWith negative sequence component voltageComposition.Power frequency fault component electric current △ i are by positive-sequence component electric currentWith negative sequence component electric currentComposition, i.e.,
During line to line fault, adaptive Current Protection device extracts power frequency failure electricity using its built-in negative-sequence current extractor
Negative sequence component voltage x current in piezoelectricity flow component calculates protection device dorsal part impedance：
In formula,It is the negative phase-sequence false voltage of adaptive Current Protection device installation place；For adaptive Current Protection is filled
Put the negative sequence fault current of installation place.
During three-phase fault, ignore change of the photo-voltaic power supply output current before and after failure, adaptive Current Protection device profit
Positive sequence fault component voltage, the positive sequence failure in power frequency false voltage current component are extracted with its built-in forward-order current extractor
Current weight calculates protection device dorsal part impedance Zs：
In formula,It is the positive sequence fault component voltage of adaptive Current Protection device installation place；For self-adaptive current is protected
The positive sequence fault component electric current of protection unit installation place.
4. adaptive Current Protection device dorsal part equivalent source electromotive force is calculated
In formula,Faulted phase voltage, faulted phase current respectively during failure at protection device.Refer to A phases, B
Phase or C phases.
5. in the protection act setting valve of line computation adaptive Current Protection device, self adaptation I sections of setting valve II ZFor：
In formula：KkIt is safety factor, value 1.1~1.3；KdIt is the fault type coefficient of step 2. middle determination；EsIt is step
4. the protection dorsal part equivalent source electromotive force obtained by；ZsFor step 3. gained protection dorsal part impedance；ZLFor protected circuit hinders
It is anti-.If flowing through the fault current of protection device more than self-adaptive current I sections of setting valve, the outlet of adaptive Current Protection device
Relay instantaneously sends trip signal and gives the adaptive Current Protection device administrative breaker, makes it trip.
Self adaptation II sections of setting valve be：
In formula,It is safety factor, value 1.1~1.3；KdIt is the fault type coefficient of step 2. middle determination；EsIt is step
The protection dorsal part equivalent source electromotive force of rapid 4. gained；ZsFor step 3. gained protection dorsal part impedance；ZL sheetsIt is this section of circuit resistance
It is anti-；ZUnder LIt is protection next stage circuit impedance.If flowing through the fault current of protection device more than self-adaptive current II sections of setting valve,
The then exit relay of adaptive Current Protection device time delay 0.5s actions after a failure, send trip signal and give self adaptation electricity
The administrative breaker of stream protection device, makes it trip.
Self adaptation III sections of setting valve be：
In formula,It is safety factor, value 1.1~1.3；KssIt is self-starting coefficient, value 1.2~1.3；KreTo return
Coefficient, value 0.85；IloadTo flow through the Real-time Load electric current of protection, if the fault current for flowing through protection device is more than self adaptation
Electric current III sections of setting valve, then the exit relay of adaptive Current Protection device is after a failure compared to next level adaptation III
Section time delay is acted for 0.5 second, is sent trip signal and is given the adaptive Current Protection device administrative breaker, makes it trip；If under
One-level is configured without self adaptation III sections, then time delay is acted the exit relay of adaptive Current Protection device for 1 second after a failure,
Sending trip signal gives the adaptive Current Protection device administrative breaker, makes it trip；.
6. each longitudinal differential current protective device difference failure judgement that the upper level circuit two ends of photovoltaic access point arrange
Direction and the exchange judged result that communicates；
If failure judgement is positive direction failure to each longitudinal differential current protective device simultaneously, step is performed 7.；If vertical connection is poor
System power supply side protection device judged result in streaming current protection device is reverse direction failure, performs step 8.；If vertical connection is poor
Photovoltaic electric source protection device failure judgement in streaming current protection device is reverse direction failure, then perform step 9..
7. the no-delay control of each longitudinal differential current protective device is located at the disconnected of the upper level circuit both sides of photovoltaic access point
Road device tripping operation, isolated fault.
8. each longitudinal differential current protective device failure judgement is located at the lines upstream of the upper level circuit of photovoltaic access point,
The upper level circuit both sides breaker of each Unit protection device locking photovoltaic access point, simultaneity factor mains side is corresponding certainly
The breaker of its administrative close photovoltaic side of current protective device control tripping is adapted to, photo-voltaic power supply electric current is cut off.
9. the upper level circuit both sides breaker of longitudinal differential current protective device locking photovoltaic access point, photovoltaic access point
Upper level circuit the circuit of upper level again in adaptive Current Protection device control the open circuit of its administrative close photovoltaic side
Device does not trip.
In abovementioned steps, longitudinal differential current protective device failure judgement direction is carried out using its built-in directional element
Judge.
Directional element failure judgement direction method, by taking A phases as an example, if
Then it is judged as positive direction failure.
In formula,The BC line voltages of installation place are protected during for failure；60 ° of value；Guarantor is flowed through during for failure
The A phase currents of protection unit, walking direction is prior art, is no longer described in detail.
To verify the validity of the current protection method containing distributed photovoltaic power power distribution network of the present embodiment, the present embodiment
It is middle to use the simulation model schematic diagram containing distributed photovoltaic power power distribution network as shown in Figure 1, the present invention is done further in detail
Explanation.
As shown in figure 1, directional pilot protection 3,5 is configured at the upper level circuit CD two ends of photovoltaic access point bus D, at this
The photovoltaic side of the upper level circuit BC of level circuit installs breaker BRK additional, occurs in opposite direction when 3 directional element failure judgements are protected
When, BRK trips to cut off the short circuit current of photovoltaic offer.Remaining line system side is equipped with I, II, III three-stage self adaptation electricity
Z in stream protection 1,2,4, Fig. 1L1To ZL4It is the impedance of respective lines.
The related simulation parameter containing distributed photovoltaic power power distribution network shown in Fig. 1 is shown in Table 1.
The simulation parameter of table 1
1. assuming when there is BC line to line fault on circuit CD, changing positions of the trouble point f on circuit BC and (being represented with α
Ratio of the trouble point away from distance the line is busy the road CD length of protection 5), the dorsal part impedance Z of each adaptive guard 1,2s, dorsal part electromotive force
Es, I sections of setting valve and action situation it is as shown in table 2.Whether pilot protection 3,5 walking direction results, action situation and BRK jump
Lock is as shown in table 3.
Self-adaptive current fast tripping protection 1, the 2I section setting valve of table 2 and action situation
Whether the pilot protection 3 of table 3,5 walking direction results and action situation, BRK trip
When 2. assuming BC line to line fault occurs on circuit BC, the dorsal part impedance of adaptive Current Protection 1,2, dorsal part are equivalent
Electromotive force of source, I section setting valve and action situation are as shown in table 4.Pilot protection 3,5 walking direction results, action situation with
And whether BRK trips as shown in table 5.
Self-adaptive current fast tripping protection 1, the 2I section setting valve of table 4 and action situation
Whether the pilot protection 3 of table 5,5 walking direction results and action situation, BRK trip
3. assume ABC three-phase shortcircuits on circuit CD, the position for changing trouble point f (represents trouble point from protection 5 with α
Distance the line is busy road CD length ratio), the dorsal part impedance of adaptive Current Protection 1,2, dorsal part equivalent source electromotive force, I sections
Whether setting valve, action situation and BRK trip as shown in table 6.
Whether self-adaptive current fast tripping protection 1, the 2I section setting valve of table 6 and action situation, BRK trip
4. assume three-phase shortcircuit on circuit BC, the dorsal part impedance of adaptive Current Protection 1,2, dorsal part equivalent source
Electromotive force, I section setting valve and action situation are as shown in table 7.
Whether self-adaptive current fast tripping protection 1, the 2I section setting valve of table 7 and action situation, BRK trip
Simulation result shows that relaying configuration method of the invention can quickly judge fault section after a failure.When event
Barrier occurs when on circuit AC, and system side failure electric current is cut off by adaptive Current Protection 1,2, and photovoltaic side fault current is by protecting
3 dorsal part breaker BRK cut off；When failure occurs in circuit CD, failure is cut off by pilot protection 3,5, and BRK is failure to actuate；When
Failure occurs in bus D downstream lines, and failure is cut off by adaptive Current Protection 4.Protection act is not accessed by photovoltaic substantially
Influence.Feeder line each position failure can quickly be cut off.Therefore the relaying configuration method has stronger practicality.
Above example is the explanation to specific embodiment of the invention, rather than limitation of the present invention, relevant technology
The technical staff in field without departing from the spirit and scope of the present invention, can also make various conversion and change and obtain
To corresponding equivalent technical scheme, therefore all equivalent technical schemes should be included into patent protection model of the invention
Enclose.
Claims (3)
1. a kind of current protection method containing distributed photovoltaic power power distribution network, it is characterised in that comprise the following steps：
1. photo-voltaic power supply access point upper level circuit set longitudinal differential current protective device, the upper level circuit with
And the photovoltaic side of the circuit of upper level again of the upper level circuit installs breaker additional；System power supply side remaining line configuring I,
II, III three-stage adaptive Current Protection device；
2. after power distribution network breaks down, adaptive Current Protection device first determines whether that fault type is line to line fault or three-phase shortcircuit
And mutually should determine that fault type COEFFICIENT Kd；
3. adaptive Current Protection device dorsal part when adaptive Current Protection device calculates two-phase short-circuit fault using formula (1) hinders
Anti- Zs；Calculate adaptive Current Protection device dorsal part impedance Z during three phase short circuit fault in real time using formula (2)s：
In formula,It is the negative phase-sequence false voltage of adaptive Current Protection device installation place；For adaptive Current Protection device is pacified
Negative sequence fault current at dress；
In formula,It is the positive sequence fault component voltage of adaptive Current Protection device installation place；For adaptive Current Protection is filled
Put the positive sequence fault component electric current of installation place；
4. adaptive Current Protection device calculates its dorsal part equivalent source electromotive force using formula (3)
In formula,Faulted phase voltage during the failure that respectively adaptive Current Protection device is obtained at protection device,
Faulted phase current,It is A phases, B phases or C phases；
5. adaptive Current Protection device acts setting valve and makes corresponding protection act in line computation I, II, III three section protection：
Adaptive Current Protection device is using formula (4) in line computation I sections of protection act setting valve II Z：
In formula：KkIt is safety factor, value 1.1~1.3；KdIt is the fault type coefficient of step 2. middle determination；EsIt is step 4. institute
The protection dorsal part equivalent source electromotive force for obtaining；ZsFor step 3. gained protection dorsal part impedance；ZLIt is I sections of protected circuit impedance；
If the fault current for flowing through adaptive Current Protection device is more than the I sections of protection act setting valve I for calculatingI Z, then it is adaptive
The exit relay of induced current protection device instantaneously sends trip signal and gives the adaptive Current Protection device administrative breaker,
It is made trip；
Adaptive Current Protection device is using formula (5) in line computation II sections of protection act setting valve III Z：
In formula,It is safety factor, value 1.1~1.3；KdIt is the fault type coefficient of step 2. middle determination；EsFor step 4.
The protection dorsal part equivalent source electromotive force of gained；ZsFor step 3. gained protection dorsal part impedance；ZL sheetsIt is this section of line impedance；
ZUnder LIt is protection next stage circuit impedance；
If the fault current for flowing through adaptive Current Protection device is more than the II sections of setting valve I for calculatingII Z, then self-adaptive current
The time delay 0.5s actions after a failure of the exit relay of protection device, send trip signal to the adaptive Current Protection device institute
The breaker of linchpin, makes it trip；
Adaptive Current Protection device is using formula (6) in line computation III sections of protection act setting valve
In formula,It is safety factor, value 1.1~1.3；KssIt is self-starting coefficient, value 1.2~1.3；KreIt is to return
Number, value 0.85；IloadTo flow through the Real-time Load electric current of adaptive Current Protection device；
If the fault current for flowing through adaptive Current Protection device is more than the self-adaptive current III sections of setting valve for calculating, from
The exit relay for adapting to current protective device is acted for 0.5 second compared to next level adaptation III sections of time delay after a failure, is sent
Trip signal gives the adaptive Current Protection device administrative breaker, makes it trip；If next stage is configured without self adaptation III
Section, then time delay is acted adaptive Current Protection device exit relay for 1 second after a failure, is sent trip signal and is given self adaptation electricity
The administrative breaker of stream protection device, makes it trip；
6. each longitudinal differential current protective device difference failure judgement direction that the upper level circuit two ends of photovoltaic access point arrange
And the exchange judged result that communicates；
If failure judgement is positive direction failure to each longitudinal differential current protective device simultaneously, step is performed 7.；If longitudinal differential is electric
System power supply side protection device judged result in stream protection device is reverse direction failure, performs step 8.；If longitudinal differential is electric
Photovoltaic electric source protection device failure judgement in stream protection device is reverse direction failure, then perform step 9.；
7. the no-delay control of each longitudinal differential current protective device is located at the breaker of the upper level circuit both sides of photovoltaic access point
Tripping operation, isolated fault；
8. each longitudinal differential current protective device failure judgement is located at the lines upstream of the upper level circuit of photovoltaic access point, each vertical
Join the upper level circuit both sides breaker of high-frequency orientation protector locking photovoltaic access point, the corresponding self adaptation of simultaneity factor mains side
The breaker of its administrative close photovoltaic side of current protective device control tripping, cuts off photo-voltaic power supply electric current；
9. the upper level circuit both sides breaker of longitudinal differential current protective device locking photovoltaic access point, photovoltaic access point it is upper
Adaptive Current Protection device in the circuit of upper level again of one-level circuit controls the breaker of its administrative close photovoltaic side not
Tripping operation.
2. the current protection method containing distributed photovoltaic power power distribution network according to claim 1, it is characterised in that described
The step of 2. in, adaptive Current Protection device failure judgement type and determine fault type COEFFICIENT KdMethod be：
System side A phase currents after adaptive Current Protection device collection failureWith C phase currentsAnd enter by following rule
Row judges：
IfThen judge BC line to line fault；
IfThen judge AB line to line fault；
IfThen judge AC line to line fault；
If first three formula is unsatisfactory for, three-phase fault is judged；
Wherein K1Value 0.5；If it is determined that being phase to phase fault, then fault type COEFFICIENT KdValueIf it is determined that be three-phase fault, then
Fault type COEFFICIENT KdValue 1.
3. the current protection method containing distributed photovoltaic power power distribution network according to claim 1, it is characterised in that described
The step of 3. in, the negative phase-sequence false voltage in formula (1)And negative sequence fault currentAnd the positive sequence fault component in formula (2)
VoltageWith positive sequence fault component electric currentCome from：
Adaptive Current Protection device obtains power frequency false voltage component △ u and power frequency fault current component △ after failure occurs
i；Wherein,
The voltage u of adaptive Current Protection device installation places of the power frequency false voltage component △ u by measuringmSubtract pre-fault status
Under voltage u[0]And obtain；
The electric current i of adaptive Current Protection device installation places of the power frequency fault current component △ i by measuringmSubtract pre-fault status
Under electric current i[0]And obtain.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997679.5A CN106786413B (en) | 2016-11-14 | 2016-11-14 | The current protection method of the power distribution network containing distributed photovoltaic power |
| CN201811130061.4A CN109193584B (en) | 2016-11-14 | 2016-11-14 | A kind of current protection method of the power distribution network containing distributed photovoltaic power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610997679.5A CN106786413B (en) | 2016-11-14 | 2016-11-14 | The current protection method of the power distribution network containing distributed photovoltaic power |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811130061.4A Division CN109193584B (en) | 2016-11-14 | 2016-11-14 | A kind of current protection method of the power distribution network containing distributed photovoltaic power |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453337A (en) * | 2017-09-04 | 2017-12-08 | 湖南长高思瑞自动化有限公司 | A kind of distributed photovoltaic and network protection method and device |
| CN107607822A (en) * | 2017-10-27 | 2018-01-19 | 南方电网科学研究院有限责任公司 | A kind of power distribution network adaptive Current Protection Performance Test System and method |
| CN107919646A (en) * | 2017-10-19 | 2018-04-17 | 广东电网有限责任公司电力科学研究院 | The current protection setting method and device of a kind of power distribution network containing photovoltaic |
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| CN112255567A (en) * | 2020-10-16 | 2021-01-22 | 西安石油大学 | Method for quickly determining short-circuit current of power distribution network containing photovoltaic power supply |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101515715A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | WAN-based method for protecting feeder line containing distributed power |
| CN101552461A (en) * | 2009-01-09 | 2009-10-07 | 天津大学 | Method for protecting power distribution network containing distributed generation |
| CN103812095A (en) * | 2014-02-27 | 2014-05-21 | 国家电网公司 | Directional pilot protection method for power distribution network containing distributed generation |
| CN104810809A (en) * | 2015-04-21 | 2015-07-29 | 国家电网公司 | Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access |
| CN104852362A (en) * | 2015-04-20 | 2015-08-19 | 平高集团有限公司 | Overcurrent protection method and grid structure applicable to power distribution network with distributed generation (DG) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872665B (en) * | 2014-03-26 | 2017-01-18 | 国家电网公司 | Power distribution network integrated protection method suitable for access of distributed power supplies |
| CN105098741A (en) * | 2014-05-07 | 2015-11-25 | 国家电网公司 | Relay protection configuration method of distribution network to which distributed generation gets access |
| CN104242273A (en) * | 2014-09-24 | 2014-12-24 | 天津大学 | Self-adaptation positive sequence current quick breaking protection method for power grid containing inverter-based DG (distributed generation) |
| CN104779591B (en) * | 2015-03-30 | 2017-09-19 | 天津大学 | A kind of longitudinal differential protection scheme after inverse distributed power T links |
| CN106058830B (en) * | 2016-07-26 | 2018-05-18 | 华北电力大学 | A kind of current protection system of power distribution network containing DG and method |
-
2016
- 2016-11-14 CN CN201811130061.4A patent/CN109193584B/en active Active
- 2016-11-14 CN CN201610997679.5A patent/CN106786413B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101552461A (en) * | 2009-01-09 | 2009-10-07 | 天津大学 | Method for protecting power distribution network containing distributed generation |
| CN101515715A (en) * | 2009-04-03 | 2009-08-26 | 天津大学 | WAN-based method for protecting feeder line containing distributed power |
| CN103812095A (en) * | 2014-02-27 | 2014-05-21 | 国家电网公司 | Directional pilot protection method for power distribution network containing distributed generation |
| CN104852362A (en) * | 2015-04-20 | 2015-08-19 | 平高集团有限公司 | Overcurrent protection method and grid structure applicable to power distribution network with distributed generation (DG) |
| CN104810809A (en) * | 2015-04-21 | 2015-07-29 | 国家电网公司 | Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access |
Non-Patent Citations (2)
| Title |
|---|
| 杨义等: "含分布式电源的配电网继电保护配置改进", 《电力建设》 * |
| 鞠非 等: "含分布式ＰＶ的配电网功率方向纵联保护方案", 《合肥工业大学学报（自然科学版）》 * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107453337A (en) * | 2017-09-04 | 2017-12-08 | 湖南长高思瑞自动化有限公司 | A kind of distributed photovoltaic and network protection method and device |
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| CN107919646A (en) * | 2017-10-19 | 2018-04-17 | 广东电网有限责任公司电力科学研究院 | The current protection setting method and device of a kind of power distribution network containing photovoltaic |
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| CN110165637B (en) * | 2019-03-08 | 2022-09-20 | 中国电力科学研究院有限公司 | Line protection method, system and device for inverter type power supply access |
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| CN110649581A (en) * | 2019-10-30 | 2020-01-03 | 中国南方电网有限责任公司 | Protection method for closed-loop power distribution network containing distributed power supply |
| CN112255567A (en) * | 2020-10-16 | 2021-01-22 | 西安石油大学 | Method for quickly determining short-circuit current of power distribution network containing photovoltaic power supply |
| CN112255567B (en) * | 2020-10-16 | 2023-05-09 | 西安石油大学 | Short-circuit current rapid determination method for power distribution network containing photovoltaic power supply |
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| CN109193584B (en) | 2019-11-05 |
| CN106786413B (en) | 2018-10-30 |
| CN109193584A (en) | 2019-01-11 |
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