CN109193584A - A kind of current protection method of the power distribution network containing distributed photovoltaic power - Google Patents
A kind of current protection method of the power distribution network containing distributed photovoltaic power Download PDFInfo
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- CN109193584A CN109193584A CN201811130061.4A CN201811130061A CN109193584A CN 109193584 A CN109193584 A CN 109193584A CN 201811130061 A CN201811130061 A CN 201811130061A CN 109193584 A CN109193584 A CN 109193584A
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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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Abstract
The present invention provides a kind of current protection method of power distribution network containing distributed photovoltaic power, including longitudinal differential current protective device is arranged for photovoltaic access point higher level's route 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；Setting valve is acted in line computation I, II, III three section protection and makes corresponding protection act and each longitudinal differential current protective device judges fault direction respectively and makes corresponding protection act.Guard method of the invention is not influenced by system operation mode, can ensure that each protective device correctly acts, and functional reliability is high.
Description
It is on November 14th, 2016 that present patent application, which is application No. is the 201610997679.5, applying date, invents wound
Make the divisional application of the application for a patent for invention of entitled " current protection method of the power distribution network containing distributed photovoltaic power ".
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 technique
Although the stability of system can be improved in distributed photovoltaic power grid, the use of fossil fuel, meeting are reduced
It affects to existing protection, so that malfunction or tripping occur for current protection traditional in power distribution network, it is therefore, right
The protection of power distribution network containing distributed photovoltaic power access, which is studied, gradually becomes the hot issue studied both at home and abroad.
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, so that larger impact is brought 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
In the shunting function of distributed generation resource, the electric current for flowing into current protective device can be reduced, to reduce original current protective device
Protection scope, 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, increases its protection scope, it is possible to make to protect
Range extends to next route, so that malfunction occurs for current protective device.Meanwhile because photovoltaic generating system does not rotate
Component, because of the damping action come without inertia belt, the fault characteristic for showing it from traditional synchronous motor is different, photovoltaic
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 mentions
A kind of new more reasonable current protection method out, it appears very necessary.
Summary of the invention
The purpose of the present invention is: the problems of the prior art are directed to, 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 movement.
The technical scheme is that the current protection method of the power distribution network of the invention containing distributed photovoltaic power, packet
Include following steps:
1. 1 longitudinal differential current protective device is respectively arranged in the upper level route both ends in photo-voltaic power supply access point, in institute
The photovoltaic side for stating the route of upper level again of upper level route and the upper level route 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 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；For adaptive Current Protection dress
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；For self-adaptive current guarantor
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 respectively during the failure of adaptive Current Protection device acquisition at protective device
Voltage, faulted phase current,For A phase, B phase or C phase；
5. adaptive Current Protection device acts setting valve in line computation I, II, III three section protection and makes corresponding protection
Movement:
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. resulting protection back side equivalent source electromotive force；ZsFor step 3. resulting protection back side impedance；ZLFor I sections of protected circuits
Impedance；
If the fault current for flowing through adaptive Current Protection device is greater than calculated I sections of protection act setting valve II Z, then
The exit relay of adaptive Current Protection device instantaneously issues 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
Rapid 4. resulting protection back side equivalent source electromotive force；ZsFor step 3. resulting adaptive Current Protection device back side impedance；
ZL sheetFor this section of line impedance；ZUnder LTo protect next stage circuit impedance；
If the fault current for flowing through adaptive Current Protection device is greater 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 movement, issue 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；IloadFor the real-time load electric current for flowing through adaptive Current Protection device；
If the fault current for flowing through adaptive Current Protection device is greater 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, issues the trip signal breaker administrative to the adaptive Current Protection device, 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 after a failure and acts, and issues tripping
The signal breaker administrative to the adaptive Current Protection device, enables its tripping；
6. the longitudinal differential current protective device that the upper level route both ends of photovoltaic access point are arranged judges failure side respectively
To and communicate exchange judging result；
If 2 longitudinal differential current protective devices judge 7. failure for positive direction failure, executes step simultaneously；If 2 vertical
Joining and being located at the longitudinal differential current protective device judging result of system power supply side in differential current protection is reverse direction failure,
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 to the disconnected of the upper level route two sides of photovoltaic access point
The tripping of road device, isolated fault；
8. 2 longitudinal differential current protective devices judge that failure is located at the upstream line of the upper level route of photovoltaic access point
Road, the upper level route two sides breaker of 2 Unit protection device locking photovoltaic access points, simultaneity factor source side are corresponding
Adaptive Current Protection device control its administrative close photovoltaic side of tripping breaker, cutting photo-voltaic power supply electric current；
9. the upper level route two sides breaker of 2 longitudinal differential current protective device locking photovoltaic access points, photovoltaic connect
Adaptive Current Protection device in the route of upper level again of the upper level route of access point controls its administrative close photovoltaic side
Breaker does not trip；
Above-mentioned step 2. in, adaptive Current Protection device judge fault type and determine fault type COEFFICIENT KdSide
Method are as follows:
Adaptive Current Protection device acquires the system side A phase current after failureWith C phase currentAnd press following rule
Then judged:
IfThen determine BC line to line fault；
IfThen determine AB line to line fault；
IfThen determine AC line to line fault；
If first three formula is not satisfied, three-phase fault is determined；
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；
Above-mentioned step 3. in, the negative phase-sequence false voltage in formula (1)And negative sequence fault currentAnd in formula (2)
Positive sequence fault component 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 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 is higher, and protection scope is 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 route both ends.
Detailed description of the invention
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 embodiment
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, comprising the following steps:
1. 1 longitudinal differential current protective device is respectively arranged in the upper level route both ends in photo-voltaic power supply access point, at this
The photovoltaic side of the route of upper level again of upper level route and the upper level route installs breaker additional；Remaining route of power distribution network exists
System power supply side configures I, II, III three-stage adaptive Current Protection device.
So-called upper level route and again upper level route refer to the route 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 current after failureWith C phase currentAnd press following rule
Then judged:
IfThen determine BC line to line fault；IfThen determine AB line to line fault；IfThen determine AC line to line fault；If first three formula is not satisfied, three-phase fault is determined；
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 is by positive-sequence component electricity
PressureWith negative sequence component voltageComposition.Power frequency fault component electric current △ i is by positive-sequence component electric currentWith negative sequence component electric currentComposition, i.e.,
When line to line fault, adaptive Current Protection device extracts power frequency failure electricity using the negative-sequence current extractor built in it
Negative sequence component voltage and current in piezoelectricity flow component calculates the impedance of protective device back side:
In formula,For the negative phase-sequence false voltage of adaptive Current Protection device installation place；For adaptive Current Protection dress
Set the negative sequence fault current of installation place.
When three-phase fault, ignore variation of the photo-voltaic power supply output electric current before and after failure, adaptive Current Protection device benefit
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；For self-adaptive current guarantor
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 phase, B
Phase or C phase.
5. in the protection act setting valve of line computation adaptive Current Protection device, adaptive I sections of setting valve II ZAre as follows:
In formula: KkFor safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step
4. resulting protection back side equivalent source electromotive force；ZsFor step 3. resulting adaptive Current Protection device back side impedance；ZLFor
Protected circuit impedance.If the fault current for flowing through protective device is greater than self-adaptive current I sections of setting valve, self-adaptive current is protected
The exit relay of protection unit instantaneously issues the trip signal breaker administrative to the adaptive Current Protection device, enables its jump
Lock.
Adaptive II sections of setting valves are as follows:
In formula,For safety factor, value 1.1~1.3；KdFor step 2. in determine fault type coefficient；EsFor step
Rapid 4. resulting protection back side equivalent source electromotive force；ZsFor step 3. resulting protection back side impedance；ZL sheetIt is hindered for this section of route
It is anti-；ZUnder LTo protect next stage circuit impedance.If the fault current for flowing through protective device is greater than self-adaptive current II sections of protection act
Setting valve, then the exit relay of adaptive Current Protection device be delayed after a failure 0.5s movement, issue trip signal to should
The administrative breaker of adaptive Current Protection device, enables its tripping.
Adaptive III sections of setting valves are as follows:
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 greater 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
III sections of level adaptation act for delay 0.5 second, issue the trip signal breaker administrative to the adaptive Current Protection device, enable
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, issue 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 route both ends of photovoltaic access point are arranged judges failure side respectively
To and communicate exchange judging result；
If 2 longitudinal differential current protective devices judge 7. failure for positive direction failure, executes step simultaneously；If 2 vertical
Joining and being located at the longitudinal differential current protective device judging result of system power supply side in differential current protection is reverse direction failure,
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 to the disconnected of the upper level route two sides of photovoltaic access point
The tripping of road device, isolated fault.
8. 2 longitudinal differential current protective devices judge that failure is located at the upstream line of the upper level route of photovoltaic access point
Road, the upper level route two sides breaker of 2 Unit protection device locking photovoltaic access points, simultaneity factor source side are corresponding
Adaptive Current Protection device control its administrative close photovoltaic side of tripping breaker, cutting photo-voltaic power supply electric current.
9. the upper level route two sides breaker of 2 longitudinal differential current protective device locking photovoltaic access points, photovoltaic connect
Adaptive Current Protection device in the route of upper level again of the upper level route of access point controls its administrative close photovoltaic side
Breaker does not trip.
In abovementioned steps, longitudinal differential current protective device judges fault direction, is carried out using the directional element built in it
Judgement.
Directional element judges fault direction method, by taking A phase as an example, if
Then it is judged as positive direction failure.
In formula,For the BC line voltage for protecting installation place during failure；Value 60o；To flow through guarantor during failure
The A phase current of protection unit, 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 upper level both ends route CD of photovoltaic access point bus D, at this
The photovoltaic side of the upper level route BC of grade route installs breaker BRK additional, when 3 directional elements of protection judge that failure occurs in opposite direction
When, BRK tripping is to cut off the short circuit current that photovoltaic provides.It is adaptively electric that remaining line system side is equipped with I, II, III three-stage
Stream protection 1,2, Z in 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 that, when BC line to line fault occurs on route CD, change position of the fault point f on route BC (is 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 route 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 shortcircuit occurs on route 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 route 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
Barrier occurs when on route 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 back side breaker BRK cutting；When failure occurs in route CD, failure is cut off by pilot protection 3,5, and BRK is failure to actuate；When
Failure occurs in bus D downstream line, and 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 embodiments are the explanations to a specific embodiment of the invention, rather than limitation 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 patent protection model of the invention
It encloses.
Claims (1)
1. a kind of current protection method of power distribution network containing distributed photovoltaic power, which comprises the following steps:
1. 1 longitudinal differential current protective device is respectively arranged in the upper level route both ends in photo-voltaic power supply access point, on described
The photovoltaic side of the route of upper level again of level-one route and the upper level route 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；For adaptive Current Protection device peace
Negative sequence fault current at dress；
In formula,For the positive sequence fault component voltage of adaptive Current Protection device installation place；For adaptive Current Protection dress
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 respectively during the failure that obtains of adaptive Current Protection device at protective device,
Faulted phase current,For A phase, B phase or C phase；
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. resulting 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 greater than calculated I sections of protection act setting valve II Z, then adaptive
The exit relay of current protective device is answered instantaneously to issue the trip signal breaker administrative to the adaptive Current Protection device,
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
Resulting protection back side equivalent source electromotive force；ZsFor step 3. resulting protection back side impedance；ZL sheetFor this section of line impedance；
ZUnder LTo protect next stage circuit impedance；
If the fault current for flowing through adaptive Current Protection device is greater 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 movement, issue 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；KreTo return to system
Number, value 0.85；IloadFor the real-time load electric current for flowing through adaptive Current Protection device；
If the fault current for flowing through adaptive Current Protection device is adjusted greater 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 movement issues the trip signal breaker administrative to the adaptive Current Protection device, enables its tripping；If next stage is not matched
Set III sections adaptive, then adaptive Current Protection device exit relay is delayed 1 second after a failure and acts, and issues trip signal
It gives the adaptive Current Protection device administrative breaker, enables its tripping；
6. the longitudinal differential current protective device that the upper level route both ends of photovoltaic access point are arranged judges fault direction simultaneously respectively
Communication exchange judging result；
If 2 longitudinal differential current protective devices judge 7. failure for positive direction failure, executes step simultaneously；If 2 vertical connection are poor
Longitudinal differential current protective device judging result in streaming current protective device positioned at system power supply side 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 to the breaker of the upper level route two sides of photovoltaic access point
Tripping, isolated fault；
8. 2 longitudinal differential current protective devices judge that failure is located at the lines upstream of the upper level route of photovoltaic access point, 2
Unit protection device is latched the upper level route two sides breaker of photovoltaic access point, and simultaneity factor source side is adaptive accordingly
The breaker for answering current protective device control its administrative close photovoltaic side of tripping, cuts off photo-voltaic power supply electric current；
9. the upper level route two sides breaker of 2 longitudinal differential current protective device locking photovoltaic access points, photovoltaic access point
Upper level route the route of upper level again in adaptive Current Protection device control the open circuit of its administrative close photovoltaic side
Device does not trip；
The step 2. in, adaptive Current Protection device judge fault type and determine fault type COEFFICIENT KdMethod are as follows:
Adaptive Current Protection device acquires the system side A phase current after failureWith C phase currentAnd it is carried out by following rule
Judgement:
IfThen determine BC line to line fault；
IfThen determine AB line to line fault；
IfThen determine AC line to line fault；
If first three formula is not satisfied, three-phase fault is determined；
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；
The step 3. in, the negative phase-sequence false voltage in formula (1)And negative sequence fault currentAnd the positive sequence in formula (2)
Fault component voltageWith positive sequence fault component electric currentIt comes from:
Adaptive Current Protection device obtains power frequency false voltage component △ u and power frequency fault current component △ after failure occurs
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| CN201610997679.5A CN106786413B (en) | 2016-11-14 | 2016-11-14 | The current protection method of the power distribution network containing distributed photovoltaic power |
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| 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 |
| 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 |
| 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 |
| CN113708352A (en) * | 2021-08-23 | 2021-11-26 | 广东电网有限责任公司 | Relay protection method and device |
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