CN106786413B - The current protection method of the power distribution network containing distributed photovoltaic power - Google Patents
The current protection method of the power distribution network containing distributed photovoltaic power Download PDFInfo
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- CN106786413B CN106786413B CN201610997679.5A CN201610997679A CN106786413B CN 106786413 B CN106786413 B CN 106786413B CN 201610997679 A CN201610997679 A CN 201610997679A CN 106786413 B CN106786413 B CN 106786413B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003044 adaptive effect Effects 0.000 claims abstract description 101
- 230000001681 protective effect Effects 0.000 claims abstract description 60
- 238000009434 installation Methods 0.000 claims description 18
- 230000003111 delayed effect Effects 0.000 claims description 6
- 230000002441 reversible effect Effects 0.000 claims description 6
- 238000000819 phase cycle Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 2
- 230000001934 delay Effects 0.000 claims 1
- 230000005611 electricity Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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Classifications
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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 of the power distribution network containing distributed photovoltaic power, including longitudinal differential current protective device is arranged for photovoltaic access point higher level's circuit and system power supply side configures 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 accordingly determines fault type COEFFICIENT Kd；Adaptive Current Protection device judges two-phase or three-phase fault and the impedance of protective device back side and back side equivalent source electromotive force；It acts setting valve in line computation I, II, III three section protection and makes corresponding protection act and each longitudinal differential current protective device and failure judgement direction and make corresponding protection act respectively.The guard method of the present invention is not influenced by system operation mode, can ensure that each protective device correctly acts, and functional reliability is high.
Description
Technical field
The present invention relates to distribution protection methods, and in particular to a kind of electricity suitable for the power distribution network containing distributed photovoltaic power
Flow guard method.
Background technology
Although distributed photovoltaic power grid can improve the stability of system, the use of fossil fuel, meeting are reduced
It affects to existing protection so that malfunction or tripping occur for traditional current protection in power distribution network, therefore, right
The hot issue for gradually becoming and studying both at home and abroad is studied in the protection of power distribution network containing distributed photovoltaic power access.
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 becomes the distribution network of more power supplys, and when power distribution network breaks down, the size and Orientation of short circuit current can occur
Great changes, to bring larger impact to current protection mode used by conventional electrical distribution net so that electric in conventional electrical distribution net
It flows protective device and malfunction or tripping occurs, specifically, for the current protective device of distributed power access point upstream, by
It can be reduced in the electric current of the shunting function of distributed generation resource, inflow current protective device, to reduce original current protective device
Protection domain, or even make original current protective device that tripping occur；Protection for distributed power access point downstream, due to
Photo-voltaic power supply helps increasing to act on, and will increase the electric current for flowing through current protective device, so that its protection domain is increased, it is possible to make protection
Range extends to next circuit, so that malfunction occurs for current protective device.Meanwhile because photovoltaic generating system does not rotate
Component keeps the fault characteristic that it shows from traditional synchronous motor different, photovoltaic because of the damping action come without inertia belt
Output of the power supply during failure generally remains symmetrical three-phase current, and the capacity of photo-voltaic power supply is smaller than the capacity of system
Very much, this weak mains characteristic can make the current protective device in conventional electrical distribution net after accessing distributed photovoltaic power often
It cannot correctly act.Therefore, it for the current protection of the power distribution network containing distributed photovoltaic power, studies and carries
Go out a kind of new more rational current protection method, it appears very necessary.
Invention content
The purpose of the present invention is：For the problems of the prior art, a kind of power distribution network containing distributed photovoltaic power is provided
Current protection method, this method can not be influenced by system operation mode, it is ensured that current protective device can when breaking down
Correct action.
The technical scheme is that：The current protection method of the power distribution network containing distributed photovoltaic power of the present invention, packet
Include following steps：
1. 1 longitudinal differential current protective device is respectively arranged at the upper level circuit both ends of photo-voltaic power supply access point, in institute
The photovoltaic side for stating the circuit of upper level again of upper level circuit and the upper level circuit installs breaker additional；System power supply side its
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
It is short-circuit and accordingly determine fault type COEFFICIENT Kd；
3. adaptive Current Protection device calculates adaptive Current Protection device back of the body when two-phase short-circuit fault using formula (1)
Side impedance Zs；Calculate adaptive Current Protection device back side impedance Z when three phase short circuit fault in real time using formula (2)s：
In formula,For the negative phase-sequence false voltage of adaptive Current Protection device installation place；It is filled for adaptive Current Protection
Set the negative sequence fault current of installation place；
In formula,For the positive sequence fault component voltage of adaptive Current Protection device installation place；It is protected for self-adaptive current
The positive sequence fault component electric current of protection unit installation place；
4. adaptive Current Protection device calculates its back side equivalent source electromotive force using formula (3)
In formula,Failure phase during the failure that respectively adaptive Current Protection device obtains at protective device
Voltage, faulted phase current,For A phases, B phases or C phases；
5. adaptive Current Protection device acts setting valve in line computation I, II, III three section protection and makes corresponding protection
Action：
Adaptive Current Protection device is using formula (4) in I sections of protection act setting valve I of line computationI Z：
In formula：KkFor safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step
4. the protection back side equivalent source electromotive force of gained；ZsFor step 3. gained protection back side impedance；ZLFor I sections of protected circuits
Impedance；
If the fault current for flowing through adaptive Current Protection device is more than calculated I sections of protection act setting valve II Z, then
The exit relay of adaptive Current Protection device instantaneously sends out trip signal and breaks to the adaptive Current Protection device is administrative
Road device enables its tripping；
Adaptive Current Protection device is using formula (5) in II sections of protection act setting valve I of line computationII Z：
In formula,For safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step
The protection back side equivalent source electromotive force of rapid 4. gained；ZsFor step 3. gained adaptive Current Protection device back side impedance；
ZL sheetsFor this section of line impedance；ZUnder LTo protect next stage circuit impedance；
If the fault current for flowing through adaptive Current Protection device is more than calculated II sections of protection act setting valve III Z,
Then the exit relay of adaptive Current Protection device be delayed after a failure 0.5s action, send out trip signal give the adaptive electricity
The administrative breaker of protective device is flowed, its tripping is enabled；
Adaptive Current Protection device is using formula (6) in III sections of protection act setting valves of line computation
In formula,For safety factor, value 1.1~1.3；KssFor 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 calculated self-adaptive current III sections of protection acts
Setting valveThen the exit relay of adaptive Current Protection device is delayed compared to next level adaptation III sections after a failure
It acts within 0.5 second, sends out trip signal and give the adaptive Current Protection device administrative breaker, enable its tripping；If next stage does not have
There is adaptive III sections of configuration, then adaptive Current Protection device exit relay is delayed 1 second and acts after a failure, sends out tripping
Signal gives the adaptive Current Protection device administrative breaker, enables its tripping；
6. the longitudinal differential current protective device that the upper level circuit both ends of photovoltaic access point are arranged distinguishes failure judgement side
To and communicate exchange judging result；
If failure judgement is positive direction failure to 2 longitudinal differential current protective devices simultaneously, step is executed 7.；If 2 vertical
It is reverse direction failure to join and be located at the longitudinal differential current protective device judging result of system power supply side in differential current protection,
Execute step 8.；If the longitudinal differential current protective device in 2 longitudinal differential current protective devices positioned at photovoltaic electric source is sentenced
Disconnected failure is reverse direction failure, is thened follow the steps 9.；
7. the no-delay control of 2 longitudinal differential current protective devices is set on the disconnected of the upper level circuit both sides of photovoltaic access point
Road device tripping, isolated fault；
8. 2 longitudinal differential current protective device failure judgements are located at the upstream line of the upper level circuit of photovoltaic access point
Road, the upper level circuit both sides breaker of 2 Unit protection device locking photovoltaic access points, simultaneity factor mains side are corresponding
Adaptive Current Protection device control tripping its administrative close photovoltaic side breaker, cut-out photo-voltaic power supply electric current；
9. the upper level circuit both sides breaker of 2 longitudinal differential current protective device locking photovoltaic access points, photovoltaic connect
Adaptive Current Protection device in the circuit of upper level again of the upper level circuit of access point controls its administrative close photovoltaic side
Breaker does not trip.
Further embodiment is, above-mentioned step 2. in, adaptive Current Protection device failure judgement type and determination therefore
Hinder genre modulus KdMethod be：
Adaptive Current Protection device acquires the system side A phase currents after failureWith C phase currentsAnd press 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 for three-phase event
Hinder, then fault type COEFFICIENT KdValue 1.
Further embodiment 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 currentIt comes from：
Adaptive Current Protection device obtains the power frequency false voltage component △ u after failure occurs and power frequency fault current point
Measure △ i；Wherein,
Power frequency false voltage component △ u by the adaptive Current Protection device installation place measured voltage umBefore subtracting failure
Voltage u under state[0]And it obtains；
Power frequency fault current component △ i by the adaptive Current Protection device installation place measured electric current imBefore subtracting failure
Electric current i under state[0]And it obtains.
The present invention has the effect of positive：(1) present invention provides for the current protection of the power distribution network containing distributed photovoltaic power
A kind of new method, the guard method are not influenced by system operation mode, can line computation protect setting valve, while with light
Size and the payload for lying prostrate plant-grid connection capacity are unrelated, and when load and the change of photo-voltaic power supply access capacity, the protection is equal
It can correctly act, reliability higher, protection domain bigger；Only set in the transmission line of electricity both ends installation communication of photo-voltaic power supply access
It is standby, reduce the dependence to communication equipment；Simultaneously as traditional power distribution network is the radial networks of single power supply, so one
As only system side install current protective device, the present invention on the basis of traditional distribution network protection in addition to photo-voltaic power supply access it is defeated
Current protective device is installed at electric line both ends, remaining transmission line of electricity is only installed a current protective device in system side, compared
Reduce system configuration cost in configuring traditional pilot protection at each section of upstream circuit both ends.
Description of the drawings
Fig. 1 is the simulation model schematic diagram of the power distribution network containing distributed photovoltaic power employed in embodiment, is also shown in figure
Meaning property shows the plan of establishment of current protective device used by current protection method of the present invention.
Specific implementation mode
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
(embodiment 1)
The current protection method of the power distribution network containing distributed photovoltaic power of the present embodiment, includes the following steps：
1. 1 longitudinal differential current protective device is respectively arranged at the upper level circuit both ends of photo-voltaic power supply access point, at this
The photovoltaic side of the circuit of upper level again of upper level circuit and the upper level circuit installs breaker additional；Remaining circuit of power distribution network exists
System power supply side configures I, II, III three-stage adaptive Current Protection device.
So-called upper level circuit and again upper level circuit refer to the circuit close to and closer to 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 with the corresponding fault type COEFFICIENT K of determinationd：
Adaptive Current Protection device acquires the system side A phase currents after failureWith C phase currentsAnd press 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
Hinder 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 protective device back side impedance Zs, power frequency fault component voltage △ u and power frequency fault component electric current △ i are defined as electric system hair
When raw failure, voltage u that protective device installation place measuresm, electric current imVoltage u under pre-fault status is individually subtracted[0], electric current i[0]Obtained 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.,
When line to line fault, adaptive Current Protection device utilizes the negative-sequence current extractor extraction power frequency failure electricity built in it
Negative sequence component voltage and current in piezoelectricity flow component calculates protective device back side impedance：
In formula,For the negative phase-sequence false voltage of adaptive Current Protection device installation place；It is filled for adaptive Current Protection
Set the negative sequence fault current of installation place.
When three-phase fault, ignore variation of the photo-voltaic power supply output current before and after failure, adaptive Current Protection device profit
With the positive sequence fault component voltage in the forward-order current extractor extraction power frequency false voltage current component built in it, positive sequence failure
Current weight calculates protective device back side impedance Zs：
In formula,For the positive sequence fault component voltage of adaptive Current Protection device installation place；It is protected for self-adaptive current
The positive sequence fault component electric current of protection unit installation place.
4. calculating adaptive Current Protection device back side equivalent source electromotive force
In formula,Faulted phase voltage, faulted phase current respectively during failure at protective device.Refer to A phases, B
Phase or C phases.
5. in the protection act setting valve of line computation adaptive Current Protection device, adaptive I sections of setting valve II ZFor：
In formula：KkFor safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step
4. the protection back side equivalent source electromotive force of gained；ZsFor step 3. gained adaptive Current Protection device back side impedance；ZLFor
Protected circuit impedance.If the fault current for flowing through protective device is more than I sections of setting valves of self-adaptive current, self-adaptive current is protected
The exit relay of protection unit instantaneously sends out trip signal and gives the adaptive Current Protection device administrative breaker, enables its jump
Lock.
Adaptively II sections of setting valves are：
In formula,For safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step
The protection back side equivalent source electromotive force of rapid 4. gained；ZsFor step 3. gained protection back side impedance；ZL sheetsIt is hindered for this section of circuit
It is anti-；ZUnder LTo protect next stage circuit impedance.If the fault current for flowing through protective device is more than II sections of protection acts of self-adaptive current
Setting valve, then the exit relay of adaptive Current Protection device be delayed after a failure 0.5s action, send out trip signal to should
The administrative breaker of adaptive Current Protection device, enables its tripping.
Adaptively III sections of setting valves are：
In formula,For safety factor, value 1.1~1.3；KssFor 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 protective device is more than adaptively
III sections of protection act setting valves of electric currentThen the exit relay of adaptive Current Protection device is after a failure compared to next
The delay 0.5 second of III sections of level adaptation acts, and sends out trip signal and gives the adaptive Current Protection device administrative breaker, enables
It trips；If next stage does not configure III sections adaptive, the exit relay of adaptive Current Protection device prolongs after a failure
When act within 1 second, send out trip signal and give the adaptive Current Protection device administrative breaker, enable its tripping；.
6. the longitudinal differential current protective device that the upper level circuit both ends of photovoltaic access point are arranged distinguishes failure judgement side
To and communicate exchange judging result；
If failure judgement is positive direction failure to 2 longitudinal differential current protective devices simultaneously, step is executed 7.；If 2 vertical
It is reverse direction failure to join and be located at the longitudinal differential current protective device judging result of system power supply side in differential current protection,
Execute step 8.；If the longitudinal differential current protective device in 2 longitudinal differential current protective devices positioned at photovoltaic electric source is sentenced
Disconnected failure is reverse direction failure, is thened follow the steps 9..
7. the no-delay control of 2 longitudinal differential current protective devices is set on the disconnected of the upper level circuit both sides of photovoltaic access point
Road device tripping, isolated fault.
8. 2 longitudinal differential current protective device failure judgements are located at the upstream line of the upper level circuit of photovoltaic access point
Road, the upper level circuit both sides breaker of 2 Unit protection device locking photovoltaic access points, simultaneity factor mains side are corresponding
Adaptive Current Protection device control tripping its administrative close photovoltaic side breaker, cut-out photo-voltaic power supply electric current.
9. the upper level circuit both sides breaker of 2 longitudinal differential current protective device locking photovoltaic access points, photovoltaic connect
Adaptive Current Protection device in the circuit of upper level again of the upper level circuit of access point controls its administrative close photovoltaic side
Breaker does not trip.
In abovementioned steps, longitudinal differential current protective device failure judgement direction is carried out using the directional element built in it
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,To protect the BC line voltages of installation place during failure；Value 60o；To flow through protection during failure
The A phase currents of device, walking direction are the prior art, are no longer described in detail.
For verify the present embodiment the power distribution network containing distributed photovoltaic power current protection method validity, the present embodiment
The middle simulation model schematic diagram using the power distribution network containing distributed photovoltaic power as shown in Figure 1 does further in detail the present invention
Explanation.
As shown in Figure 1, directional pilot protection 3,5 is configured at the both ends upper level circuit CD of photovoltaic access point busbar D, at this
The photovoltaic side of the upper level circuit BC of grade circuit installs breaker BRK additional, and negative direction is happened at when protecting 3 directional element failure judgements
When, BRK trippings are to cut off the short circuit current of photovoltaic offer.It is adaptively electric that remaining line system side is equipped with I, II, III three-stage
Z in stream protection 1,2,4, Fig. 1L1To ZL4For the impedance of respective lines.
The related simulation parameter of the power distribution network shown in FIG. 1 containing distributed photovoltaic power is shown in Table 1.
1 simulation parameter of table
1. assuming, when BC line to line fault occurs on circuit CD, to change positions of the fault point f on circuit BC and (indicated with α
The ratio of distance the line is busy road CD length of the fault point away from protection 5), the back side impedance Z of each adaptive guard 1,2s, back side electromotive force
Es, I sections of setting valves 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.
2 self-adaptive current fast tripping protection 1 of table, 2I sections of setting valves and action situation
Whether 3 pilot protection 3 of table, 5 walking direction results and action situation, BRK trip
2. assuming that the back side impedance of adaptive Current Protection 1,2, back side are equivalent when BC line to line fault occurs on circuit BC
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.
4 self-adaptive current fast tripping protection 1 of table, 2I sections of setting valves and action situation
Whether 5 pilot protection 3 of table, 5 walking direction results and action situation, BRK trip
3. assuming that ABC three-phase shortcircuits occur on circuit CD, the position for changing fault point f (indicates fault point from protection 5 with α
Distance the line is busy road CD length ratio), the back side impedance of adaptive Current Protection 1,2, back side equivalent source electromotive force, I sections
Whether setting valve, action situation and BRK trip as shown in table 6.
Whether 6 self-adaptive current fast tripping protection 1 of table, 2I sections of setting valves and action situation, BRK trip
4. assuming that three-phase shortcircuit occurs on circuit BC, the back side impedance of adaptive Current Protection 1,2, back side equivalent source
Electromotive force, I section setting valve and action situation are as shown in table 7.
Whether 7 self-adaptive current fast tripping protection 1 of table, 2I sections of setting valves and action situation, BRK trip
Simulation result shows relaying configuration method of the invention, can quickly judge fault section after a failure.When event
When barrier is happened on circuit AC, system side failure electric current is cut off by adaptive Current Protection 1,2, and photovoltaic side fault current is by protecting
3 back side breaker BRK cut-outs；When failure is happened in circuit CD, failure is cut off by pilot protection 3,5, and BRK is failure to actuate；When
When failure is happened at busbar D downstream lines, failure is cut off by adaptive Current Protection 4.Protection act is not accessed substantially by photovoltaic
Influence.Feeder line each position failure can be quickly cut off.Therefore the relaying configuration method has stronger practicability.
Above example is the explanation rather than limitation of the present invention to the specific implementation mode of the present invention, related technology
The technical staff in field without departing from the spirit and scope of the present invention, can also make various transformation and variation and obtain
To corresponding equivalent technical solution, therefore all equivalent technical solutions should be included into the patent protection model of the present invention
It encloses.
Claims (3)
1. a kind of current protection method of power distribution network containing distributed photovoltaic power, which is characterized in that include the following steps：
1. 1 longitudinal differential current protective device is respectively arranged at the upper level circuit both ends of photo-voltaic power supply access point, on described
The photovoltaic side of the circuit of upper level again of level-one circuit and the upper level circuit installs breaker additional；In remaining line of system power supply side
Road configures 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 accordingly determine fault type COEFFICIENT Kd；
3. adaptive Current Protection device calculates adaptive Current Protection device back side resistance when two-phase short-circuit fault using formula (1)
Anti- Zs；Calculate adaptive Current Protection device back side impedance Z when three phase short circuit fault in real time using formula (2)s：
In formula,For the negative phase-sequence false voltage of adaptive Current Protection device installation place；Pacify for adaptive Current Protection device
Negative sequence fault current at dress；
In formula,For the positive sequence fault component voltage of adaptive Current Protection device installation place；It is filled for adaptive Current Protection
Set the positive sequence fault component electric current of installation place；
4. adaptive Current Protection device calculates its back side equivalent source electromotive force using formula (3)
In formula,Faulted phase voltage during the failure that respectively adaptive Current Protection device obtains at protective device,
Faulted phase current,For A phases, B phases or C phases；
5. adaptive Current Protection device acts setting valve in line computation I, II, III three section protection and makes corresponding protection act：
Adaptive Current Protection device is using formula (4) in I sections of protection act setting valve I of line computationI Z：
In formula：KkFor safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step 4. institute
The protection back side equivalent source electromotive force obtained；ZsFor step 3. gained adaptive Current Protection device back side impedance；ZLIt is I sections
Protected circuit impedance；
If the fault current for flowing through adaptive Current Protection device is more than calculated I sections of protection act setting valve II Z, then adaptive
The exit relay of induced current protective device instantaneously sends out trip signal and gives the adaptive Current Protection device administrative breaker,
Enable its tripping；
Adaptive Current Protection device is using formula (5) in II sections of protection act setting valve I of line computationII Z：
In formula,For safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；Es4. for step
The protection back side equivalent source electromotive force of gained；ZsFor step 3. gained protection back side impedance；ZL sheetsFor this section of line impedance；
ZUnder LTo protect next stage circuit impedance；
If the fault current for flowing through adaptive Current Protection device is more than calculated II sections of protection act setting valve III Z, then certainly
Adapt to current protective device exit relay be delayed after a failure 0.5s action, send out trip signal to the self-adaptive current guarantor
The administrative breaker of protection unit, enables its tripping；
Adaptive Current Protection device is using formula (6) in III sections of protection act setting valves of line computation
In formula,For safety factor, value 1.1~1.3；KssFor 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 adjusted more than calculated self-adaptive current III sections of protection acts
ValueThe then exit relay of adaptive Current Protection device compared to next level adaptation III sections delays 0.5 after a failure
Second action sends out trip signal and gives the adaptive Current Protection device administrative breaker, enables its tripping；If next stage is not matched
Set III sections adaptive, then adaptive Current Protection device exit relay is delayed 1 second and acts after a failure, sends out trip signal
It gives the adaptive Current Protection device administrative breaker, enables its tripping；
6. the longitudinal differential current protective device difference failure judgement direction that the upper level circuit both ends of photovoltaic access point are arranged is simultaneously
Communication exchanges judging result；
If failure judgement is positive direction failure to 2 longitudinal differential current protective devices simultaneously, step is executed 7.；If 2 vertical connection are poor
The longitudinal differential current protective device judging result for being located at system power supply side in streaming current protective device is reverse direction failure, is executed
Step is 8.；If judging event positioned at the longitudinal differential current protective device of photovoltaic electric source in 2 longitudinal differential current protective devices
Barrier is reverse direction failure, is thened follow the steps 9.；
7. the no-delay control of 2 longitudinal differential current protective devices is set on the breaker of the upper level circuit both sides of photovoltaic access point
Tripping, isolated fault；
8. 2 longitudinal differential current protective device failure judgements are located at the lines upstream of the upper level circuit of photovoltaic access point, 2
Unit protection device is latched the upper level circuit both sides breaker of photovoltaic access point, and simultaneity factor mains side is adaptive accordingly
Induced current protective device controls the breaker of its administrative close photovoltaic side of tripping, cuts off photo-voltaic power supply electric current；
9. the upper level circuit both sides breaker of 2 longitudinal differential current protective device locking photovoltaic access points, 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.
2. the current protection method of the power distribution network according to claim 1 containing distributed photovoltaic power, which is characterized in that described
The step of 2. in, adaptive Current Protection device failure judgement type and determine fault type COEFFICIENT KdMethod be：
Adaptive Current Protection device acquires the system side A phase currents after failureWith C phase currentsAnd by it is following rule into
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 being three-phase fault, then
Fault type COEFFICIENT KdValue 1.
3. the current protection method of the power distribution network according to claim 1 containing distributed photovoltaic power, which is characterized 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 currentIt comes from：
Adaptive Current Protection device obtains the power frequency false voltage component △ u after failure occurs and power frequency fault current component △
i；Wherein,
Power frequency false voltage component △ u by the adaptive Current Protection device installation place measured voltage umSubtract pre-fault status
Under voltage u[0]And it obtains；
Power frequency fault current component △ i by the adaptive Current Protection device installation place measured electric current imSubtract pre-fault status
Under electric current i[0]And it obtains.
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| CN107919646B (en) * | 2017-10-19 | 2019-04-26 | 广东电网有限责任公司电力科学研究院 | A kind of the current protection setting method and device of the power distribution network containing photovoltaic |
| CN107607822B (en) * | 2017-10-27 | 2019-08-27 | 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 |
| CN108933438B (en) * | 2018-06-29 | 2021-10-08 | 河海大学 | Distribution network distributed power supply online control device and method based on system operation mode |
| CN109286202B (en) * | 2018-07-28 | 2020-05-22 | 国网江苏省电力有限公司电力科学研究院 | Large-scale inversion type power supply grid-connected tie line current differential protection method, device and system |
| CN109361200B (en) * | 2018-11-26 | 2020-09-01 | 广东电网有限责任公司 | Fault fast switching positioning method and related device and fault isolation system |
| 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 |
| CN110416981B (en) * | 2019-07-31 | 2020-07-31 | 华北电力大学 | Electric automobile access distribution network area current protection method and system |
| 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 |
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