CN109390925A - Inverter lightning-protection method, circuit and device and grid-connected inverters system - Google Patents
Inverter lightning-protection method, circuit and device and grid-connected inverters system Download PDFInfo
- Publication number
- CN109390925A CN109390925A CN201910004479.9A CN201910004479A CN109390925A CN 109390925 A CN109390925 A CN 109390925A CN 201910004479 A CN201910004479 A CN 201910004479A CN 109390925 A CN109390925 A CN 109390925A
- Authority
- CN
- China
- Prior art keywords
- surge protector
- inverter
- surge
- capacitor
- power grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000001012 protector Effects 0.000 claims abstract description 172
- 239000003990 capacitor Substances 0.000 claims abstract description 51
- 230000005611 electricity Effects 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 12
- 208000025274 Lightning injury Diseases 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 102100036683 Growth arrest-specific protein 1 Human genes 0.000 description 1
- 102100036685 Growth arrest-specific protein 2 Human genes 0.000 description 1
- 101001072723 Homo sapiens Growth arrest-specific protein 1 Proteins 0.000 description 1
- 101001072710 Homo sapiens Growth arrest-specific protein 2 Proteins 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/041—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using a short-circuiting device
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Inverter Devices (AREA)
Abstract
Inverter lightning-protection method, circuit and device provided by the invention and grid-connected inverters system, the device being connected between power grid phase line and grid zero line in inverter lightning protection circuit have the first surge protector and the second surge protector；In removing EMC filter circuit in the case where varistor, if since lightning stroke generates high voltage and the bad situation of inverter ground occurs, then power grid phase line flowing through in path to earth-current, because the first surge protector is votage limit type surge protection device, there are conduction voltage drops, and the second surge protector is switch-type surge protector part, conduction voltage drop levels off to zero, so, it is only the conduction voltage drop of a voltage-limiting surge protector part that X capacitor, which needs the residual voltage born, in EMC filter circuit, without increasing performance, and then the problem of avoiding inverter increased costs caused by the performance due to needing to increase X capacitor in the prior art.
Description
Technical field
The present invention relates to power electronics field, in particular to a kind of inverter lightning-protection method, circuit and device
And grid-connected inverters system.
Background technique
Communication lightning-protection topology in Fig. 1 shown in dotted line frame for single-phase inverter in the prior art, including varistor
MOV2 and MOV3 and gas-discharge tube GAS；When generating high voltage due to lightning stroke, the thunder-strike current of power grid phase line L over the ground
Will be via varistor MOV2 and gas-discharge tube GAS to ground, the thunder-strike current of grid zero line N over the ground will be via pressure-sensitive electricity
MOV3 and gas-discharge tube GAS is hindered to ground, and then realizes the communication lightning-protection effect for the single-phase inverter.
Due to single-phase inverter EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) filtered electrical
Lu Zhong, the varistor MOV1 being connected between power grid phase line L and grid zero line N are easy to appear tracking stream and cause to fail
Therefore problem on fire if can remove varistor MOV1, can improve system reliability.
However, after removing varistor MOV1, in the feelings of the single-phase inverter ground resistance bigger (imperfect earth)
Under condition, i.e. when R2 < < R1, if power grid phase line L has thunder-strike current over the ground, the path that flows through of the thunder-strike current will are as follows: L → MOV2
→MOV3→N→R2→PE；The X capacitor C1 in EMC filter circuit needs to bear bigger residual voltage (thunder-strike current process at this time
After varistor, the voltage that is generated on varistor), i.e. the series connection residual voltage of varistor MOV2 and MOV3；General X capacitor
It will burst because so big residual voltage cannot be born, therefore, be intended to increase X capacitor if removing varistor MOV1
Performance, so undoubtedly increase inverter cost.
Summary of the invention
The present invention provides a kind of inverter lightning-protection method, circuit and device and grid-connected inverters system, existing to solve
There is the varistor removed between power grid phase line L and grid zero line N in technology, the increased needs of X capacitive property can be brought, in turn
The problem of leading to inverter increased costs.
To achieve the above object, technical solution provided by the present application is as follows:
A kind of inverter lightning-protection method is applied to inverter lightning protection circuit, the inverter lightning protection electricity
Road includes: the first surge protector and the second surge protector being connected between power grid phase line and grid zero line, and described
One surge protector is votage limit type surge protection device, and second surge protector is switch-type surge protector part；It is described
Inverter lightning-protection method includes:
In the case where inverter ground resistance is greater than the first preset value, if first surge protector and described second
The voltage at surge protector both ends is greater than the sum of the conducting voltage of the two, then first surge protector and second surge
Protector conducting；
Power grid phase line to earth-current, after first surge protector and second surge protector, by
Grid zero line flows into the earth.
Preferably, the inverter lightning protection circuit further includes third surge protector；The inverter lightning protection
Method further include:
In the case where the inverter ground resistance is less than the second preset value, if first surge protector and described
The voltage at third surge protector both ends is greater than the sum of the conducting voltage of the two, then first surge protector and the third
Surge protector conducting；If second surge protector and the voltage at third surge protector both ends are greater than leading for the two
Be powered the sum of pressure, then second surge protector and third surge protector conducting；Second preset value is less than institute
State the first preset value；
Power grid phase line to earth-current, after first surge protector and the third surge protector, by
The inverter ground resistance flows into the earth；Grid zero line to earth-current, by second surge protector and described
After three surge protectors, the earth is flowed by the inverter ground resistance.
A kind of inverter lightning protection circuit, comprising: the first surge protector, the second surge protector and third surge
Protector；Wherein:
One end of first surge protector is connected with power grid phase line；
One end of second surge protector is connected with grid zero line；
The other end of the other end of first surge protector and second surge protector, it is electric with the third
One end of surge protector is connected；
The other end of the third surge protector passes through resistance eutral grounding；
First surge protector is votage limit type surge protection device, and second surge protector is switching mode surge
Protect device.
Optionally, the number of first surge protector is identical as the number of power grid phase line.
Optionally, first surge protector is varistor；Second surge protector is gas-discharge tube.
Optionally, the third surge protector is votage limit type surge protection device, alternatively, switch-type surge protector
Part.
Optionally, the third surge protector is varistor, alternatively, gas-discharge tube.
A kind of inverter lightning protection device, comprising: Electro Magnetic Compatibility EMC filter circuit and inverse as described in any of the above-described
Become device lightning protection circuit.
Optionally, the EMC filter circuit includes: first capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th electricity
Appearance, first fuse, second fuse and common mode inductance；Wherein:
The first capacitor is connected between power grid phase line and grid zero line；
Second capacitance connection is between power grid phase line and ground；
The third capacitance connection is between grid zero line and ground；
The first fuse is set in power grid phase line；And one end of the first fuse and the first capacitor and
Second capacitor is connected, and the other end is connected with one end of the first winding of the common mode inductance；
The second fuse is set in grid zero line；And one end of the second fuse and the first capacitor and
The third capacitor is connected, and the other end is connected with one end of the second winding of the common mode inductance；
The other end of first winding passes through the 4th capacity earth；
The other end of second winding passes through the 5th capacity earth.
A kind of grid-connected inverters system, including inverter lightning protection device as described above.
Inverter lightning-protection method provided by the invention, be connected in inverter lightning protection circuit power grid phase line and
Device between grid zero line has the first surge protector and the second surge protector；The pressure-sensitive electricity in removing EMC filter circuit
In the case where resistance, if power grid phase line is electric over the ground since lightning stroke generates high voltage and inverter ground bad situation occurs
Stream flows through in path, and because the first surge protector is votage limit type surge protection device, there are conduction voltage drops, and the second surge is protected
Shield device is that switch-type surge protector part, conduction voltage drop level off to zero, so, X capacitor needs are born residual in EMC filter circuit
Pressure be only a voltage-limiting surge protector part conduction voltage drop, without increasing performance, so avoid in the prior art due to
The problem of needing to increase inverter increased costs caused by the performance of X capacitor.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the circuit diagram for the inverter lightning protection circuit that the prior art provides；
Fig. 2 is the structural schematic diagram of inverter lightning protection circuit provided in an embodiment of the present invention；
Fig. 3 a is the flow chart of inverter lightning-protection method provided in an embodiment of the present invention；
Fig. 3 b is another flow chart of inverter lightning-protection method provided in an embodiment of the present invention；
Fig. 4 a is an electricity of the inverter lightning protection circuit provided in an embodiment of the present invention applied to single-phase inverter
Road exemplary diagram；
Fig. 4 b is an electricity of the inverter lightning protection circuit provided in an embodiment of the present invention applied to three-phase inverter
Road exemplary diagram；
Fig. 5 a is another electricity of the inverter lightning protection circuit provided in an embodiment of the present invention applied to single-phase inverter
Road exemplary diagram；
Fig. 5 b is another electricity of the inverter lightning protection circuit provided in an embodiment of the present invention applied to three-phase inverter
Road exemplary diagram；
Fig. 6 is the circuit diagram of inverter lightning protection device provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
In order to solve to remove the varistor between power grid phase line L and grid zero line N in the prior art, X capacitor can be brought
The increased needs of performance, and then the problem of lead to inverter increased costs, the present invention provides a kind of inverter lightning-protection method,
The inverter lightning-protection method is applied to inverter lightning protection circuit；The inverter lightning protection circuit is as shown in Fig. 2, packet
It includes: the first surge protector 101 and the second surge protector 102 being connected between power grid phase line and grid zero line, and first
Surge protector 101 is votage limit type surge protection device, and the second surge protector 102 is switch-type surge protector part.
Fig. 3 a is referred to, which includes:
S101, inverter ground resistance be greater than the first preset value in the case where, if the first surge protector and second electricity
The voltage at surge protector both ends is greater than the sum of the conducting voltage of the two, then the first surge protector and the second surge protector are led
It is logical；
There is situations such as imperfect earth in inverter, inverter ground resistance (the resistance R1 in such as Fig. 2) is caused to be greater than the
One preset value, first preset value can take the value for being much larger than resistance R2 resistance value, at this time R2 < < R1, power grid phase line L and electricity
Pressure difference is more likely to produce between net zero curve N；Originally this pressure difference will will lead in EMC filter circuit be located at power grid phase line L and
Varistor conducting between grid zero line N, and then releasing for lightning stroke energy is realized via grid zero line.However in power grid
After varistor between phase line L and grid zero line N is removed, this pressure difference namely the first surge protector and the second surge
The voltage at protector both ends, it will more than the sum of the conducting voltage of the two, and then the two is connected, generates electric current.
S102, power grid phase line to earth-current, after the first surge protector and the second surge protector, by power grid
Zero curve flows into the earth.
In Fig. 2, if the first surge protector 101 and the conducting of the second surge protector 102, L is to earth-current for power grid phase line
Flow through path will are as follows: L → 101 → 102 → N → R2 → PE；The X capacitor C1 needs in EMC filter circuit are born residual at this time
Pressure is the sum of the conduction voltage drop of the first surge protector 101 and the second surge protector 102.
Since the first surge protector 101 is votage limit type surge protection device, there are conduction voltage drop, and the second surge protection
Device 102 is that switch-type surge protector part, conduction voltage drop level off to zero, so it is only one that X capacitor C1, which needs the residual voltage born,
The conduction voltage drop of voltage-limiting surge protector part without increasing performance, and then avoids in the prior art due to needing to increase X electricity
Caused by the performance of appearance the problem of inverter increased costs.
Preferably, as shown in Fig. 2, the inverter lightning protection circuit further includes third surge protector 103；The inverter
Lightning-protection method is as shown in Figure 3b, on the basis of Fig. 3 a further include:
S103, in the case where inverter ground resistance is less than the second preset value, if the first surge protector and third electricity
The voltage at surge protector both ends is greater than the sum of the conducting voltage of the two, then the first surge protector and third surge protector are led
It is logical；If the second surge protector and the voltage at third surge protector both ends are greater than the sum of the conducting voltage of the two, the second electricity
Surge protector and the conducting of third surge protector；Second preset value is less than the first preset value；
S104, power grid phase line to earth-current, after the first surge protector and third surge protector, by inversion
Device ground resistance flows into the earth；Grid zero line to earth-current, after the second surge protector and third surge protector,
The earth is flowed by inverter ground resistance.
For inverter ground resistance less than the second preset value, which can take one to be much smaller than resistance R2 resistance value
It is worth, at this time R1 < < R2, if power grid phase line L's will protect earth-current by the first surge since lightning stroke generates high voltage
Device 101 and third surge protector 103 are protected to the earth, grid zero line N's will pass through the second surge protector 102 to earth-current
With third surge protector 103 to the earth.
Setting for first preset value and the second preset value, primarily in phenogram 2 resistance R1 and R2 resistance
It is worth size relation, therefore the specific choosing value of the two can be not specifically limited, depending on its application environment in the application herein
Protection scope in.
Another embodiment of the present invention additionally provides a kind of inverter lightning protection circuit, Fig. 2 is referred to, with single-phase inverter
For be illustrated, the inverter lightning protection circuit include: the first surge protector 101, the second surge protector 102 and
Third surge protector 103；Wherein:
One end of first surge protector 101 is connected with power grid phase line L；
One end of second surge protector 102 is connected with grid zero line N；
The other end of the other end of first surge protector 101 and the second surge protector 102, with third surge protection
One end of device 103 is connected；
The other end of third surge protector 103 is grounded PE by resistance R1；
Grid zero line N also passes through resistance R2 ground connection PE.
First surge protector 101 is votage limit type surge protection device, and the second surge protector 102 is switching mode surge guarantor
Protect device.And third surge protector 103 can choose using voltage-limiting surge protector part, alternatively, can also be using switch
Type surge protection device, is not specifically limited herein.
As shown in Fig. 2, being illustrated by taking single-phase inverter as an example, specific working principle are as follows:
When generating high voltage due to lightning stroke, power grid phase line L's will pass through the first surge protector 101 to earth-current
With third surge protector 103 to the earth, grid zero line N's will pass through the second surge protector 102 and third to earth-current
Surge protector 103 is to greatly.
Remove in EMC filter circuit after varistor, it is bigger in the single-phase inverter ground resistance, such as imperfect earth
In the case where, i.e. when R2 < < R1, if power grid phase line L has thunder-strike current over the ground, the path that flows through of the thunder-strike current will are as follows: and L →
101→102→N→R2→PE；The X capacitor C1 in EMC filter circuit needs the residual voltage born at this time, is the first surge protector
101 and second surge protector 102 conduction voltage drop sum.Since the first surge protector 101 is voltage-limiting surge protector
Part, there are conduction voltage drop, and the second surge protector 102 is that switch-type surge protector part, conduction voltage drop level off to zero, so
It is only the conduction voltage drop of a voltage-limiting surge protector part that X capacitor C1, which needs the residual voltage born, without increasing performance, and then is kept away
The problem of having exempted from inverter increased costs caused by the performance due to needing to increase X capacitor in the prior art.
The inverter lightning protection circuit provided in this embodiment, the connector between power grid phase line L and grid zero line N
Part is the first surge protector 101 and the second surge protector 102, by being votage limit type by the selection of the first surge protector 101
Surge protection device, and by the second surge protector 102 selection be switch-type surge protector part, come reduce power grid phase line L with
Residual voltage between grid zero line N, and then reduce and be connected in parallel on the resistance to of device between power grid phase line L and grid zero line N in late-class circuit
Press grade.That is, can both pass through the first surge protection in the case where inverter ground resistance bigger (such as imperfect earth)
Device 101 and the second surge protector 102 and resistance R2 ground connection, and then remove and be set between power grid phase line L and grid zero line N
, varistor in EMC filter circuit, meanwhile, and because only one device of thunder-strike current circuit forms residual voltage, to rear class device
Part requirement is low, without increasing the performance of X capacitor, improving reliability and reducing system composition cost indirectly.
On the basis of a upper embodiment and Fig. 2, another embodiment of the present invention additionally provides several concrete implementation shapes
Formula, as shown in Fig. 4 a to Fig. 5 b.
Since the first surge protector 101 is votage limit type surge protection device, the second surge protector 102 is switching mode electricity
Surge protector part, and third surge protector 103 can choose using voltage-limiting surge protector part, alternatively, can also use
Switch-type surge protector part；In practical applications, for the type selecting of each surge protector, there are plurality of optional mode, than
Such as:
Optionally, the first surge protector 101 is varistor, the MOV1 as shown in Fig. 4 a to Fig. 5 b.
Optionally, the second surge protector 102 is gas-discharge tube, GAS and Fig. 5 a as shown in figures 4 a and 4b and
GAS1 shown in Fig. 5 b.
Optionally, third surge protector 103 is varistor, MOV2 as shown in figures 4 a and 4b；Alternatively, the third
Surge protector 103 or gas-discharge tube, GAS2 as shown in figure 5 a and 5b.
Moreover, for voltage-limiting surge protector part, being not limited in varistor in practical application, can also use
Inhibit diode etc.；For switch-type surge protector part, it is also not limited to gas-discharge tube, it can also be using between electric discharge
Gap, silicon controlled rectifier or triacs etc.；It can be depending on its specific application environment, in the protection of the application
In range.
In addition, also it is worth noting that, the number of the first surge protector 101 is identical as the number of power grid phase line.
As shown in Fig. 2, Fig. 4 a and Fig. 5 a, applied to the inverter lightning protection circuit of single-phase inverter, the first surge
The number of protector 101 and the number of power grid phase line L are 1；Inversion as shown in Fig. 4 b and Fig. 5 b, applied to three-phase inverter
Device lightning protection circuit, the number of the first surge protector 101 and the number of power grid phase line (L1, L2, L3) are 3.
It is illustrated for the topology shown in Fig. 4 a:
Power grid phase line L passes through varistor MOV1 and gas-discharge tube GAS to grid zero line N.In inverter ground resistance
In the case where bigger (such as imperfect earth), i.e. when R2 < < R1, if power grid phase line L has thunder-strike current over the ground, and due to resistance
R1 is bigger, then the thunder-strike current will from power grid phase line L by varistor MOV1, gas-discharge tube GAS, grid zero line N with
And resistance R2, to ground PE, the pressure drop after being connected at this time due to gas-discharge tube GAS is almost 0, so power grid phase line L and power grid zero
Residual voltage between line N is the residual voltage of this device of varistor MOV1, and then substantially reduces power grid phase line L and grid zero line N
Between caused due to EMC X capacitor type selecting upgrade and increased costs.
In Fig. 4 a, power grid phase line L passes through varistor MOV1 and MOV2 to the earth PE.In the good situation of inverter ground
Under, i.e. when R1 < < R2, when power grid phase line L has thunder-strike current over the ground, which passes through varistor from power grid phase line L
MOV1 and MOV2 and resistance R1 is to greatly；At this point, the residual voltage of power grid phase line L over the ground is two pressure-sensitive generations of MOV1 and MOV2
Conduction voltage drop；But, since intermediate increased EMC measure generally is Y capacitance (C2 as shown in FIG. 6) to power grid phase line L over the ground,
For X capacitor, Y capacitance can bear very big pulse voltage, therefore not need to increase the performance of Y capacitance generally, even if needing
Increase, is also easily achieved, not will increase too many cost.Also, due to power grid phase line L over the ground between setting there are two pressure-sensitive electricity
Resistance is also unlikely to persistently on fire, plays the role of dual redundant when one of varistor is generated because of ageing failure.
In Fig. 4 a, grid zero line N passes through gas-discharge tube GAS and varistor MOV2 and resistance R1 to the earth PE.When
In the good situation of inverter ground, is i.e. when R1 < < R2, it is equivalent to the distal end grid zero line N and is grounded, if the nearest inversion of grid zero line N
Device has thunder-strike current over the ground, and since resistance R2 is bigger, then the thunder-strike current will pass through gas-discharge tube from grid zero line N
GAS, varistor MOV2 and resistance R1 are also able to achieve protection to ground PE.
It is illustrated for the topology shown in Fig. 4 b:
Its power grid phase line L1 passes through varistor MOV1 and gas-discharge tube GAS to grid zero line N.In inverter ground electricity
Hinder it is bigger in the case where, i.e. when R2 < < R1, if power grid phase line L1 has thunder-strike current over the ground, since resistance R1 is bigger, then
The thunder-strike current will from power grid phase line L1 by varistor MOV1, gas-discharge tube GAS, grid zero line N and resistance R2 to
Ground PE；At this time since the voltage after gas-discharge tube GAS conducting is almost 0, so between power grid phase line L and grid zero line N
Residual voltage is the residual voltage of MOV1 individual devices, and substantially reduce causes X electric in this way due to EMC between power grid phase line L and grid zero line N
The type selecting of appearance upgrades and increased costs.
In Fig. 4 b, power grid phase line L1 passes through varistor MOV1 and MOV2 to the earth PE.In the good feelings of inverter ground
Under condition, i.e. when R1 < < R2, if power grid phase line L1 has thunder-strike current over the ground, thunder-strike current L by varistor MOV1 and
MOV2 and resistance R1 to the earth PE；At this point, the residual voltage of power grid phase line L1 over the ground is leading for MOV1 and two pressure-sensitive generations of MOV2
Logical pressure drop；But, since intermediate increased EMC measure generally is Y capacitance to power grid phase line L over the ground, for X capacitor, Y
Capacitor can bear very big pulse voltage, therefore the performance for not needing to increase Y capacitance generally is also easily achieved even if needing to increase,
Too many cost is not will increase.Also, due to power grid phase line L1 over the ground between setting there are two varistor, when one of them is pressure-sensitive
When resistance is because of ageing failure, also it is unlikely to persistently on fire, plays the role of dual redundant.
In Fig. 4 b, grid zero line N passes through gas-discharge tube GAS and varistor MOV2 and resistance R1 to the earth PE.When
In the good situation of inverter ground, is i.e. when R1 < < R2, it is equivalent to the distal end grid zero line N and is grounded, if the nearest inversion of grid zero line N
Device has thunder-strike current over the ground, and since resistance R2 is bigger, then the thunder-strike current will pass through gas-discharge tube from grid zero line N
GAS, varistor MOV2 and resistance R1 are also able to achieve protection to ground PE.
Power grid phase line L2 is over the ground and power grid phase line L3 lightning stroke over the ground is released the lightning stroke in principle and Fig. 5 a and Fig. 5 b
It releases principle, principle of releasing with the above-mentioned lightning stroke of power grid phase line L1 over the ground is identical, no longer repeats one by one herein.
Remaining structure and principle are same as the previously described embodiments, and details are not described herein again.
Another embodiment of the present invention additionally provides a kind of inverter lightning protection device, as shown in Figure 6, comprising: EMC filtering
Circuit 200 and the inverter lightning protection circuit 100 as described in above-mentioned any embodiment.
Optionally, which includes: first capacitor C1, the second capacitor C2, third capacitor C3, the 4th capacitor
C4, the 5th capacitor C5, first fuse F1, second fuse F2 and common mode inductance L1；Wherein:
First capacitor C1 is connected between power grid phase line L and grid zero line N；
Second capacitor C2 is connected between power grid phase line L and ground；
Third capacitor C3 is connected between grid zero line N and ground；
First fuse F1 is set on power grid phase line L；And one end of first fuse F1 and first capacitor C1 and second
Capacitor C2 is connected, and the other end is connected with one end of the first winding of common mode inductance L1；
Second fuse F2 is set on grid zero line N；And one end of second fuse F2 and first capacitor C1 and third
Capacitor C3 is connected, and the other end is connected with one end of the second winding of common mode inductance L1；
The other end of first winding is grounded by the 4th capacitor C4；
The other end of second winding is grounded by the 5th capacitor C5.
In practical application, fuse is can be selected in first fuse F1 and second fuse F2.
By the inverter lightning protection circuit 100, it is set to electricity originally so that can remove in EMC filter circuit 200
Varistor between net phase line L and grid zero line N, save the cost；The specific works of the inverter lightning protection circuit 100 are former
Reason no longer repeats one by one herein as described in above-described embodiment.
Another embodiment of the present invention additionally provides a kind of grid-connected inverters system, including the inversion as described in above-described embodiment
Device lightning protection device.
The inverter lightning protection device is set between inverter and power grid, in the tool of the inverter lightning protection device
Body structure and working principle is same as the previously described embodiments, no longer repeats one by one herein.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. a kind of inverter lightning-protection method, which is characterized in that be applied to inverter lightning protection circuit, the inverter is anti-
It includes: the first surge protector and the second surge protector being connected between power grid phase line and grid zero line that thunder, which protects circuit,
And first surge protector is votage limit type surge protection device, second surge protector is switch-type surge protector
Part；The inverter lightning-protection method includes:
In the case where inverter ground resistance is greater than the first preset value, if first surge protector and second surge
The voltage at protector both ends is greater than the sum of the conducting voltage of the two, then first surge protector and second surge protection
Device conducting；
Power grid phase line to earth-current, after first surge protector and second surge protector, by power grid
Zero curve flows into the earth.
2. inverter lightning-protection method according to claim 1, which is characterized in that the inverter lightning protection circuit
It further include third surge protector；The inverter lightning-protection method further include:
In the case where the inverter ground resistance is less than the second preset value, if first surge protector and the third
The voltage at surge protector both ends is greater than the sum of the conducting voltage of the two, then first surge protector and the third surge
Protector conducting；If second surge protector and the voltage at third surge protector both ends are greater than the electric conduction of the two
The sum of pressure, then second surge protector and third surge protector conducting；Second preset value is less than described the
One preset value；
Power grid phase line to earth-current, after first surge protector and the third surge protector, by described
Inverter ground resistance flows into the earth；Grid zero line to earth-current, by second surge protector and third electricity
After surge protector, the earth is flowed by the inverter ground resistance.
3. a kind of inverter lightning protection circuit characterized by comprising the first surge protector, the second surge protector with
And third surge protector；Wherein:
One end of first surge protector is connected with power grid phase line；
One end of second surge protector is connected with grid zero line；
The other end of the other end of first surge protector and second surge protector is protected with the third surge
The one end for protecting device is connected；
The other end of the third surge protector passes through resistance eutral grounding；
First surge protector is votage limit type surge protection device, and second surge protector is switching mode surge protection
Device.
4. inverter lightning protection circuit according to claim 3, which is characterized in that of first surge protector
Number is identical as the number of power grid phase line.
5. inverter lightning protection circuit according to claim 3, which is characterized in that first surge protector is pressure
Quick resistance；Second surge protector is gas-discharge tube.
6. inverter lightning protection circuit according to claim 3, which is characterized in that the third surge protector is limited
Die mould surge protection device, alternatively, switch-type surge protector part.
7. inverter lightning protection circuit according to claim 6, which is characterized in that the third surge protector is pressure
Quick resistance, alternatively, gas-discharge tube.
8. a kind of inverter lightning protection device characterized by comprising Electro Magnetic Compatibility EMC filter circuit and as right is wanted
Seek any inverter lightning protection circuit of 3-7.
9. inverter lightning protection device according to claim 8, which is characterized in that the EMC filter circuit includes:
One capacitor, the second capacitor, third capacitor, the 4th capacitor, the 5th capacitor, first fuse, second fuse and common mode inductance；
Wherein:
The first capacitor is connected between power grid phase line and grid zero line；
Second capacitance connection is between power grid phase line and ground；
The third capacitance connection is between grid zero line and ground；
The first fuse is set in power grid phase line；And one end of the first fuse and the first capacitor and described
Second capacitor is connected, and the other end is connected with one end of the first winding of the common mode inductance；
The second fuse is set in grid zero line；And one end of the second fuse and the first capacitor and described
Third capacitor is connected, and the other end is connected with one end of the second winding of the common mode inductance；
The other end of first winding passes through the 4th capacity earth；
The other end of second winding passes through the 5th capacity earth.
10. a kind of grid-connected inverters system, which is characterized in that filled including inverter lightning protection as claimed in claim 8 or 9
It sets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910004479.9A CN109390925B (en) | 2019-01-03 | 2019-01-03 | Inverter lightning protection method, circuit and device and inverter grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910004479.9A CN109390925B (en) | 2019-01-03 | 2019-01-03 | Inverter lightning protection method, circuit and device and inverter grid-connected system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109390925A true CN109390925A (en) | 2019-02-26 |
| CN109390925B CN109390925B (en) | 2020-08-28 |
Family
ID=65430916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910004479.9A Active CN109390925B (en) | 2019-01-03 | 2019-01-03 | Inverter lightning protection method, circuit and device and inverter grid-connected system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109390925B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113438785A (en) * | 2021-06-18 | 2021-09-24 | 浙江国研智能电气有限公司 | Power supply for bulb tube filament of high-voltage X-ray machine |
| CN113872433A (en) * | 2021-10-15 | 2021-12-31 | 青岛鼎信通讯股份有限公司 | Topology for improving anti-surge capacity of LCL type grid-connected inverter |
| US11855449B2 (en) | 2021-04-09 | 2023-12-26 | Huawei Digital Power Technologies Co., Ltd. | Lightning protection apparatus and photovoltaic power generation system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201048288Y (en) * | 2007-03-12 | 2008-04-16 | 叶林 | Simple earthing 220V 2-port 3-module power supply surge protector |
| KR100941962B1 (en) * | 2008-09-03 | 2010-02-12 | 유)엔텍코리아 | Surge protector |
| CN103199516A (en) * | 2013-03-20 | 2013-07-10 | 华为技术有限公司 | Alternating current protection circuit and system lightning-protection circuit |
| CN104882870A (en) * | 2015-03-03 | 2015-09-02 | 华为技术有限公司 | Lightning protection circuit |
| US20160087424A1 (en) * | 2014-09-23 | 2016-03-24 | Nidec Motor Corporation | Powerline surge protection |
| CN207124454U (en) * | 2017-09-14 | 2018-03-20 | 广东海明晖电子科技有限公司 | A kind of surge protection circuit |
-
2019
- 2019-01-03 CN CN201910004479.9A patent/CN109390925B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201048288Y (en) * | 2007-03-12 | 2008-04-16 | 叶林 | Simple earthing 220V 2-port 3-module power supply surge protector |
| KR100941962B1 (en) * | 2008-09-03 | 2010-02-12 | 유)엔텍코리아 | Surge protector |
| CN103199516A (en) * | 2013-03-20 | 2013-07-10 | 华为技术有限公司 | Alternating current protection circuit and system lightning-protection circuit |
| US20160087424A1 (en) * | 2014-09-23 | 2016-03-24 | Nidec Motor Corporation | Powerline surge protection |
| CN104882870A (en) * | 2015-03-03 | 2015-09-02 | 华为技术有限公司 | Lightning protection circuit |
| CN207124454U (en) * | 2017-09-14 | 2018-03-20 | 广东海明晖电子科技有限公司 | A kind of surge protection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11855449B2 (en) | 2021-04-09 | 2023-12-26 | Huawei Digital Power Technologies Co., Ltd. | Lightning protection apparatus and photovoltaic power generation system |
| CN113438785A (en) * | 2021-06-18 | 2021-09-24 | 浙江国研智能电气有限公司 | Power supply for bulb tube filament of high-voltage X-ray machine |
| CN113872433A (en) * | 2021-10-15 | 2021-12-31 | 青岛鼎信通讯股份有限公司 | Topology for improving anti-surge capacity of LCL type grid-connected inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109390925B (en) | 2020-08-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3128633B1 (en) | Transient over voltage and lightning protection of power connected equipment | |
| CN109390925A (en) | Inverter lightning-protection method, circuit and device and grid-connected inverters system | |
| CN103795045A (en) | Protective device | |
| CN106505842B (en) | Airborne DC power supply | |
| CN103023003A (en) | Over-voltage absorption circuit and over-voltage absorption device | |
| CN201663544U (en) | Filter module with electromagnetic interference resistance and transient suppression functions | |
| CN203180510U (en) | Combined overvoltage protector of resistance capacitance lightening arrester | |
| CN102148498A (en) | Digital subscriber line (DSL) protection circuit | |
| CN201066763Y (en) | Combined arrester for compound resistance capacitance | |
| CN107979273A (en) | Power filter protects circuit | |
| CN204578080U (en) | A kind of surge protection circuit | |
| CN208580145U (en) | Controller operating voltage management system | |
| JP5192002B2 (en) | Surge energy conversion circuit | |
| CN111064172A (en) | Protection circuit and variable pitch system | |
| RU2459333C1 (en) | Device to protect equipment against pulse overloads | |
| CN202586325U (en) | Lightning-protection surge-proof power source protection device | |
| CN108803766A (en) | Controller operating voltage manages system | |
| KR100981787B1 (en) | One chip surge arrester with selector switch | |
| CN206117147U (en) | Interface protective circuit | |
| CN2590234Y (en) | Microcomputer arc extinguishing, wire selecting and excess voltage comprehensive protector | |
| CN109066636A (en) | A kind of circuit of Anti-surging | |
| CN2836019Y (en) | Circuit of electrical measuring instrument for power supply protection | |
| CN106505545B (en) | A kind of surge protecting circuit and surge protector | |
| CN106532673B (en) | A kind of surge protecting circuit and surge protector | |
| CN208479473U (en) | A kind of DC-DC power module inhibiting booting surge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |