CN204349434U - A kind of protective device and from net inverter - Google Patents
A kind of protective device and from net inverter Download PDFInfo
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- CN204349434U CN204349434U CN201520026581.6U CN201520026581U CN204349434U CN 204349434 U CN204349434 U CN 204349434U CN 201520026581 U CN201520026581 U CN 201520026581U CN 204349434 U CN204349434 U CN 204349434U
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- net inverter
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- protective circuit
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Abstract
The utility model provides a kind of protective device and from net inverter, by in tradition from the interchange outlet side crow bar protective circuit in parallel of net inverter and voltage detecting circuit, should from the current output voltage of the interchange outlet side of net inverter by this voltage detecting circuit Real-Time Monitoring, when reducing load suddenly, when this current output voltage will reach pre-set threshold value, crow bar Continuity signal is sent to this crow bar protective circuit, to trigger this crow bar protective circuit conducting, thus make this crow bar protective circuit and Inductor form loop, energy in this inductance is discharged, for reserving regulating time from the control ring of net inverter, by the Voltage Cortrol of AC to normal voltage value, solve traditional from net inverter because himself control ring response speed not causes AC overvoltage, and Inductor produces overvoltage because of afterflow, and cause the technical problem that this is burned from the device of net inverter.
Description
Technical field
The application of the utility model major design photovoltaic off-grid inverter, more particularly relates to a kind of protective device and from net inverter.
Background technology
At present, inverter is a requisite part in photovoltaic generating system, usually combining inverter is divided into and from net inverter two class, with combining inverter unlike, not grid-connected from net inverter ac side, thus, in its practical application, without the need to consider grid-connected after safe operation problem, simplify control operation.
Traditional from the practical application of net inverter, its AC voltage control adopts alternating voltage closed-loop control usually, alternating voltage is controlled especially by traditional PI adjuster, but, because voltage sample postpones, PI control ring postpones, when there is the sudden change from full load condition to Light Condition, the response speed of existing PI control ring cannot meet actual requirement, be easy to cause from net inverter ac side overvoltage; And now owing to being adopt inductor filter from the AC of net inverter, inductive current cannot suddenly change, and also can cause AC overvoltage, thus makes this be burned from the device in net inverter.
Utility model content
In view of this; the utility model provides a kind of protective device and from net inverter; solve traditional from net inverter when there is the sudden change from full load condition to Light Condition, easily cause AC overvoltage, thus make the technical problem that this is burned from the device in net inverter.
A kind of protective device, be applied to from net inverter, described device comprises:
Be connected in parallel on the crow bar protective circuit of the described interchange outlet side from net inverter;
Be connected in parallel on the described interchange outlet side from net inverter, the voltage detecting circuit and output is connected with described crow bar protective circuit control end;
Then when described voltage detecting circuit detects that the described current output voltage from net inverter ac outlet side reaches pre-set threshold value, send crow bar Continuity signal, to trigger the conducting of described crow bar protective circuit to described crow bar protective circuit;
When described voltage detecting circuit detects that the current output voltage of the described interchange outlet side from net inverter is less than pre-set threshold value, send crow bar cut-off signals to described crow bar protective circuit, turn off to trigger described crow bar protective circuit.
Preferably, described voltage detecting circuit comprises:
Be connected in parallel on the voltage detector of the described interchange outlet side from net inverter;
The comparator be connected with described voltage detector, and the output of described comparator is connected with the control end of described crow bar protective circuit.
Preferably, described device also comprises:
The warning circuit be connected with described voltage detecting circuit.
Preferably, described warning circuit is specially indicator light.
Preferably, described warning circuit is specially buzzer.
Preferably, described warning circuit is specially voice module.
Preferably, described warning circuit is specifically positioned at described from the monitoring platform of net inverter.
Preferably, described device also comprises:
The memory be connected with described voltage detecting circuit.
Preferably, the output quantity of described crow bar protective circuit is equal with the number of phases of described transformer, and output one_to_one corresponding each with the AC of described transformer is connected respectively.
From a net inverter, describedly to comprise from net inverter:
Inversion unit, be connected with described inversion unit output and filter, and the protective device as above be connected with described filter output.
As can be seen here, the utility model provides a kind of protective device and from net inverter, by in tradition from the interchange outlet side crow bar protective circuit in parallel of net inverter and voltage detecting circuit, should from the current output voltage of the interchange outlet side of net inverter by this voltage detecting circuit Real-Time Monitoring, when reducing load suddenly, when this current output voltage will reach pre-set threshold value, crow bar Continuity signal is sent to this crow bar protective circuit, to trigger this crow bar protective circuit conducting, thus make this crow bar protective circuit and Inductor form loop, energy in this inductance is discharged, for reserving regulating time from the control ring of net inverter, by this Voltage Cortrol from net inverter ac outlet side to normal voltage value, solve traditional from net inverter because himself control ring response speed not causes AC overvoltage, and Inductor produces overvoltage because of afterflow, and cause the technical problem that this is burned from the device of net inverter.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structural representation of a kind of protective device embodiment of the utility model;
Fig. 2 is the structural representation of the another kind of protective device embodiment of the utility model;
Fig. 3 is a kind of structural representation from net inverter embodiment of the utility model;
Fig. 4 is the another kind of structural representation from net inverter embodiment of the utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of protective device and from net inverter, by in tradition from the interchange outlet side crow bar protective circuit in parallel of net inverter and voltage detecting circuit, should from the current output voltage of net inverter ac outlet side by this voltage detecting circuit Real-Time Monitoring, when reducing load suddenly, when this current output voltage will reach pre-set threshold value, crow bar Continuity signal is sent to this crow bar protective circuit, to trigger this crow bar protective circuit conducting, thus make this crow bar protective circuit and Inductor form loop, energy in this inductance is discharged, for reserving regulating time from the control ring of net inverter, by the Voltage Cortrol of AC to normal voltage value, solve traditional from net inverter because himself control ring response speed not causes AC overvoltage, and Inductor produces overvoltage because of afterflow, and cause the technical problem that this is burned from the device of net inverter.
The structural representation of a kind of protective device embodiment of the utility model shown in composition graphs 1 and Fig. 2; this protective device can be applied to from net inverter; this device that then the present embodiment provides specifically can comprise: crow bar protective circuit 110 and voltage detecting circuit 120, wherein:
This crow bar protective circuit 110 is connected in parallel on the interchange outlet side from net inverter, as shown in Figure 1, when this interchange from net inverter output is provided with isolating transformer, this crow bar protective circuit 110 is connected in parallel on the high-pressure side of this isolating transformer, now, in actual applications, the quantity of the lead-out wire of this crow bar protective circuit 110 is determined according to the number of phases of this transformer, three-phase is as shown in Figure 1 from the structural representation of net inverter, and three lead-out wires of crow bar protective circuit 110 are connected with the on high-tension side three-phase one_to_one corresponding of three-phase transformer respectively; The single-phase structural representation from net inverter as shown in Figure 2, now, the input of crow bar protective circuit 110 is connected with the high-pressure side output one_to_one corresponding of this single-phase transformer respectively with output.
It should be noted that; if do not comprise isolating transformer in net inverter; this crow bar protective circuit 110 only need be connected with the filter output of AC, its function and the course of work similar, the utility model at this only to include being described from net inverter of isolated inverter.
Wherein, the concrete structure of the crow bar protective circuit 110 that the present embodiment is used can refer to existing crow bar protective circuit, and the utility model is not described in detail in this.
Voltage detecting circuit 120 is connected in parallel on the interchange outlet side from net inverter, and its output is connected with the control end of this crow bar protective circuit 110, to trigger this crow bar protective circuit 110 conducting or shutoff by the signal exported.
In the practical application of the present embodiment, this voltage detecting circuit 120 can be used for detecting in real time this current output voltage from the interchange outlet side of net inverter, and when it reaches pre-set threshold value, crow bar Continuity signal is sent to this crow bar protective circuit 110, to trigger crow bar protective circuit 110 conducting, thus make the resistance incoming transport side in this crow bar protective circuit, loop is formed with the inductance from net inverter ac side, energy in inductance is discharged, overvoltage can not be produced because of the afterflow of the electric current in inductance, now, to should adjust AC voltage from self control ring of net inverter, normal voltage value is adjusted back to make it.
As can be seen here, when from net inverter ac lateral load anticlimax, the timely access of crow bar protective circuit 110, for leaving the time from the adjustment of self control ring of net inverter to AC voltage, avoids the generation causing the situation of AC overvoltage because himself control ring response speed is inadequate; Simultaneously; because this crow bar protective circuit 110 forms loop with Inductor; make the afterflow of the electric current on this inductance can not cause AC overvoltage; thus avoid because this causes damage from net inverter ac side overtension to its device used, and then increase this maintenance cost from net inverter.
Wherein, carrying out in adjustment process from self control ring of net inverter to AC voltage; if voltage detecting circuit 120 detects that this current voltage from the interchange outlet side of net inverter gets back to normal voltage value; when being namely less than above-mentioned pre-set threshold value; this voltage detecting circuit 120 can send crow bar cut-off signals to the control end of crow bar protective circuit 110; turn off to trigger this crow bar protective circuit 110, now, should namely can be load normal power supply from net inverter.
Known based on above-mentioned analysis, when normal from net inverter ac outlet side voltage, crow bar protective circuit 110 is in off state, can not affect this normal work from net inverter; Once detect that this is from net inverter ac outlet side overtension, by this crow bar protective circuit 110 conducting of triggering, to ensure that this carries out in adjustment process from net inverter control ring to AC voltage, its device used can not be burned.Visible, the protective device that the utility model adopts is not changed the structure of tradition from net inverter, only needs incoming transport side, very convenient, and is easy to realize.
It should be noted that, the crow bar cut-off signals that voltage detecting circuit 120 is exported and crow bar Continuity signal, it is specifically as follows high level signal or low level signal, this will determine according to the concrete structure of crow bar protective circuit 110, even the control end of this crow bar protective circuit 110 needs a high level signal, just can make the effectively conducting of this crow bar protective circuit 110, then this crow bar Continuity signal can be high level signal; Otherwise, as long as send low level signal to the control end of this crow bar protective circuit 110, can trigger conducting.The utility model does not do concrete restriction to this, and those skilled in the art can set according to the concrete structure feature of adopted crow bar protective circuit 110, and the utility model is not described in detail in this.
Optionally, the utility model voltage detecting circuit 120 used can determine set position according to from net inverter working site situation, and as being arranged in other on-the-spot electric equipments, the utility model does not do concrete restriction to this.For the concrete composition of this voltage detecting circuit 120, it can comprise:
Be connected in parallel on the voltage detector of the interchange outlet side from net inverter.
Wherein, this voltage detector can be voltage sample device, voltage sensor etc., and the utility model does not do concrete restriction to this.
The comparator be connected with this voltage detector, and the output of this comparator is connected with the control end of crow bar protective circuit 110.
In actual applications; this comparator one input receive be pre-set threshold value; another input is connected with this voltage detector output; be used for the current voltage of the interchange outlet side from net inverter that this voltage detector of real-time reception detects; and itself and pre-set threshold value are compared; comparative result is delivered to the control end of crow bar protective circuit 110 with crow bar Continuity signal or crow bar cut-off signals form, to trigger this crow bar protective circuit 110 conducting or shutoff.
Optionally; on the basis of the various embodiments described above; this protective device can also comprise: the warning circuit be connected with voltage detecting circuit 120, when the current flow for detecting from the interchange outlet side of net inverter at this voltage detecting circuit 120 is greater than pre-set threshold value, and output alarm information.
Wherein, this warning circuit is specifically as follows indicator light, buzzer or voice module etc., and the utility model does not do concrete restriction to this.
In actual applications, this warning circuit specifically can be arranged on from the monitoring platform of net inverter, so that during its output alarm information, the staff at monitoring platform place can understand this present behavior from net inverter in time.Wherein, this monitoring platform can be the monitoring equipment in middle control, usually can be used for monitoring multiple stage from the work of net inverter.
In addition, in the utility model, the memory be connected with voltage detecting circuit 120 can also be provided with, for recording this working condition from net inverter, specifically each moment of collecting of recording voltage detector can exchange magnitude of voltage of outlet side etc., for inquiring about from now on.
With reference to shown in Fig. 3 and Fig. 4, this practicality is novel additionally provide a kind of from net inverter embodiment, what the present embodiment provided comprises protective device described by above-described embodiment from net inverter, and each device that tradition comprises from net inverter, as DC bus, inversion unit and filter etc., certainly, as above shown in Fig. 1 and 2, the isolating transformer with filter output two-phase should can also be comprised from net inverter, the utility model does not do concrete restriction to this, about connection and the function thereof of these devices, belong to general knowledge known in this field, the utility model is not described in detail in this.
Wherein, the composition structure from the protective device in net inverter provided about the present embodiment can refer to the description of the embodiment corresponding part of above-mentioned protective device, and the utility model does not repeat them here.
It should be noted that, about above-described embodiment provide from net inverter, respectively circuit breaker can also be set in DC side and AC except each device of above-mentioned record, namely the DC circuit breaker DF in Fig. 1 and AC circuit breaker AF, and for link of connecting each device etc., the utility model describes in detail no longer one by one at this.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a protective device, is characterized in that, be applied to from net inverter, described device comprises:
Be connected in parallel on the crow bar protective circuit of the described interchange outlet side from net inverter;
Be connected in parallel on the described interchange outlet side from net inverter, the voltage detecting circuit and output is connected with described crow bar protective circuit control end;
Then when described voltage detecting circuit detects that the current output voltage of the described interchange outlet side from net inverter reaches pre-set threshold value, send crow bar Continuity signal, to trigger the conducting of described crow bar protective circuit to described crow bar protective circuit;
When described voltage detecting circuit detects that the current output voltage of the described interchange outlet side from net inverter is less than pre-set threshold value, send crow bar cut-off signals to described crow bar protective circuit, turn off to trigger described crow bar protective circuit.
2. device according to claim 1, is characterized in that, described voltage detecting circuit comprises:
Be connected in parallel on the voltage detector of the described interchange outlet side from net inverter;
The comparator be connected with described voltage detector, and the output of described comparator is connected with the control end of described crow bar protective circuit.
3. device according to claim 1 and 2, is characterized in that, described device also comprises:
The warning circuit be connected with described voltage detecting circuit.
4. device according to claim 3, is characterized in that, described warning circuit is specially indicator light.
5. device according to claim 3, is characterized in that, described warning circuit is specially buzzer.
6. device according to claim 3, is characterized in that, described warning circuit is specially voice module.
7. device according to claim 3, is characterized in that, described warning circuit is specifically positioned at described from the monitoring platform of net inverter.
8. device according to claim 1 and 2, is characterized in that, described device also comprises:
The memory be connected with described voltage detecting circuit.
9. device according to claim 1 and 2, is characterized in that, the output quantity of described crow bar protective circuit is equal with the described number of phases from net inverter, and is connected with the described each output one_to_one corresponding of outlet side that exchanges from net inverter respectively.
10. from a net inverter, it is characterized in that, describedly to comprise from net inverter:
Inversion unit;
The filter be connected with described inversion unit output;
The protective device as described in any one of claim 1-7 be connected with described filter output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520026581.6U CN204349434U (en) | 2015-01-14 | 2015-01-14 | A kind of protective device and from net inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520026581.6U CN204349434U (en) | 2015-01-14 | 2015-01-14 | A kind of protective device and from net inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349434U true CN204349434U (en) | 2015-05-20 |
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ID=53232677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520026581.6U Active CN204349434U (en) | 2015-01-14 | 2015-01-14 | A kind of protective device and from net inverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349434U (en) |
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2015
- 2015-01-14 CN CN201520026581.6U patent/CN204349434U/en active Active
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| GR01 | Patent grant |