CN110190586A - It is a kind of to cross method of flow control, equipment and system - Google Patents
It is a kind of to cross method of flow control, equipment and system Download PDFInfo
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- CN110190586A CN110190586A CN201910501516.7A CN201910501516A CN110190586A CN 110190586 A CN110190586 A CN 110190586A CN 201910501516 A CN201910501516 A CN 201910501516A CN 110190586 A CN110190586 A CN 110190586A
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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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—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 for converters; for rectifiers for static converters or rectifiers for DC-DC converters
-
- 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
- H02H7/10—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 for converters; for rectifiers
- H02H7/12—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 for converters; for rectifiers for static converters or rectifiers
- H02H7/122—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 for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1227—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 for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the output circuit, e.g. short circuit
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- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Method of flow control, equipment and system are crossed the invention discloses a kind of, method includes: when receiving level-one over-current signal for the first time, timer starts to carry out timing, locking pulse driving signal simultaneously, at the end of judging level-one over-current signal, delay preset time period is lifted a blockade pulse drive signal again, while indicating overcurrent number using the count value of counter.Next time is when receiving level-one over-current signal again, locking pulse driving signal, and at the end of judge level-one over-current signal again, the preset time period that is delayed is lifted a blockade pulse drive signal again, and so on.When time when judging timer is greater than preset threshold or judges that the count value of counter is greater than preset value N, determine that reactance occurs continuing overcurrent, continue locking pulse driving signal within a preset period of time no longer to release, thus the risk that switching device fails by persistent fever can be reduced.
Description
Technical field
The present invention relates to power electronics field more particularly to a kind of method of flow control, equipment and systems excessively.
Background technique
Converter be it is a kind of input power can be converted according to certain purpose after the device that exports, in converter
It would generally include reactance and switching device.
When the electric current of reactance excessive (hereinafter referred to as overcurrent), excessive electric current may be such that the component in circuit loses
Effect, such as switching device may be made to fail due to generating heat serious, thus at present would generally the reactance to converter carried out flow control
System, it is specific to cross flow control scheme are as follows: and setting level-one overcurrent value and second level overcurrent value, second level overcurrent value are greater than level-one overcurrent value,
Think that overcurrent occurs in reactive current when the electric current of reactance is more than level-one overcurrent value.When the electric current of reactance is greater than level-one overcurrent value
And when being less than second level overcurrent value, the corresponding pulse drive signal of switching device of the of short duration block converter of the controller of converter,
The block to pulse drive signal is released again when reactive current is lower than primary current value, when the electric current of reactance is greater than second level overcurrent
When value, the thorough locking pulse driving signal of the controller of converter is no longer released.
But reactive current is caused to be continuously in greater than level-one overcurrent value and less than second level when the load of circuit occurs abnormal
When overcurrent value, it can then lead to electricity by the current control of reactance near level-one overcurrent value using above-mentioned flow control scheme excessively
Device heating is serious in road, and there are the risks of failure.
Summary of the invention
In order to solve above-mentioned technical problem of the existing technology, method of flow control, equipment are crossed this application provides a kind of
And system, when judging that overcurrent occurs continuing in reactance, persistently locking pulse driving signal is no longer released within a preset period of time, drop
Low switching device seriously generates heat due to the risk of component failure because continuing.
The embodiment of the present application provides a kind of method of flow control excessively, is applied to converter, the converter includes reactance and opens
Close device；This method comprises:
When receiving level-one over-current signal for the first time, timer T starts to carry out timing, while locking pulse driving signal；
At the end of judging the level-one over-current signal, delay preset time period is lifted a blockade the pulse drive signal again, counter
It is started counting from 0 and counter adds 1；
When next time receives level-one over-current signal again, the pulse drive signal is blocked；The level-one overcurrent letter is judged again
At the end of number, the preset time period that is delayed is lifted a blockade the pulse drive signal again, and counter adds 1；And so on；
The electric current that the level-one over-current signal corresponds to the reactance is greater than default level-one overcurrent value；
Until judging that the time of the T timing is greater than preset threshold or judges that the count value of the counter is greater than preset value
When N, the pulse drive signal is persistently blocked in default blocking time section and is no longer released；Otherwise the timer and the counting
Device is reset.
Preferably, the preset time period increases with the increase of the count value of the counter.
Preferably, further includes: when receiving second level over-current signal, persistently block the pulse in default blocking time section and drive
Dynamic signal no longer releases；The electric current that the second level over-current signal corresponds to the reactance is greater than default second level overcurrent value, described default
Second level overcurrent value is greater than the default level-one overcurrent value.
Preferably, the converter is DC-DC converter or DC-AC converter；
The switching device is insulated gate bipolar transistor IGBT.
The application also provides a kind of flow control device excessively, is applied to converter, the converter includes reactance and derailing switch
Part；The equipment includes: current sensor, the first comparison circuit and controller；
The current sensor, for detecting the electric current of the reactance；
First comparison circuit, for the electric current of the reactance to be compared with default level-one overcurrent value, when described
The electric current of reactance exports the level-one over-current signal to the controller when being greater than the default level-one overcurrent value；
The controller, for when receiving level-one over-current signal for the first time, timer T starts to carry out timing, seals simultaneously
Lock pulse drive signal；At the end of judging the level-one over-current signal, delay preset time period is lifted a blockade the pulse again
Driving signal, counter is started counting from 0 and counter adds 1；When next time receives level-one over-current signal again, blocks the pulse and drive
Dynamic signal；At the end of next time judges the level-one over-current signal, the preset time period that is delayed is lifted a blockade the pulse again
Driving signal, and counter adds 1；And so on；Until judging the time of the T timing greater than preset threshold or judging the meter
When the count value of number device is greater than preset value N, the pulse drive signal is persistently blocked in default blocking time section and is no longer released；Instead
The timer and the counter reset.
Preferably, the preset time period increases with the increase of the count value of the counter.
Preferably, further includes: the second comparison circuit；
Second comparison circuit, for the electric current of the reactance to be compared with default second level overcurrent value, when described
The electric current of reactance exports second level over-current signal to the controller when being greater than the default second level overcurrent value；
The controller, for persistently blocking the pulse in default blocking time section when receiving second level over-current signal
Driving signal no longer releases；The default second level overcurrent value is greater than the default level-one overcurrent value.
The application also provides a kind of photovoltaic generating system, comprising: converter and excessively flow control device；The converter includes
Reactance and switching device；
It is described to cross flow control device, for detecting the electric current of the reactance；When the electric current of the reactance is greater than default level-one
Level-one over-current signal is exported when overcurrent value, when receiving the level-one over-current signal for the first time, timer T starts to carry out timing,
Locking pulse driving signal simultaneously；At the end of judging the level-one over-current signal, delay preset time period is lifted a blockade institute again
Pulse drive signal is stated, counter is started counting from 0 and counter adds 1；When next time receives level-one over-current signal again, described in block
Pulse drive signal；At the end of next time judges the level-one over-current signal, the preset time period that is delayed is lifted a blockade institute again
Pulse drive signal is stated, and counter adds 1；And so on；Until judging that the time of the T timing is greater than preset threshold or judgement
When the count value of the counter is greater than preset value N, the pulse drive signal is persistently blocked no longer in default blocking time section
It releases；Otherwise the timer and the counter are reset.
Preferably, the preset time increases with the increase of the count value of the counter.
Preferably, described to cross flow control device, it is also used to compare in the electric current of the reactance and default second level overcurrent value
Compared with the output second level over-current signal when the electric current of the reactance is greater than the default second level overcurrent value is believed when receiving second level overcurrent
Number when, persistently block the pulse drive signal in default blocking time section and no longer release；The default second level overcurrent value is greater than
The default level-one overcurrent value.
Preferably, the converter is DC-DC converter or DC-AC converter；
The switching device is insulated gate bipolar transistor IGBT.
Preferably, when the converter is DC-DC converter, the DC-DC converter is Boost circuit, and being used for will
The voltage of photovoltaic module output exports after being boosted；
When the converter is DC-AC converter, the DC-AC converter, for export the photovoltaic module
DC inverter is that alternating current is exported.
Compared with prior art, the application has at least the following advantages:
Method provided by the present application, when receiving level-one over-current signal for the first time, locking pulse driving signal, due to switch
The pulse drive signal of device is blocked, and electric current decline, MOS switch dissipation is alleviated；When judging that level-one over-current signal terminates
When, delay preset time period is lifted a blockade pulse drive signal again, provides the time for the decline of electric current, and counter is since 0
It counts and counter adds 1, the i.e. number of counters count overcurrent；Next time is when receiving level-one over-current signal again, again locking pulse
Driving signal, at the end of judging level-one over-current signal again, delay preset time period is lifted a blockade pulsed drive letter again
Number, and counter adds 1；And so on, circulation proceeds as described above.It is greater than preset threshold when the time for judging timer T timing
Or when judging that the count value of counter is greater than preset value N, characterization reactive current, which continues overcurrent, can not drop to default level-one overcurrent
Value is hereinafter, there are the risks of component failure, and lasting locking pulse driving signal no longer releases in default blocking time section at this time.
It can be seen that using method provided by the present application, it can reduce what the switching device of converter failed due to continuing and seriously generating heat
Risk.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of flow chart for crossing method of flow control that the embodiment of the present application one provides；
Fig. 2 is a kind of schematic diagram for crossing flow control device that the embodiment of the present application two provides；
Fig. 3 is another schematic diagram for crossing flow control device that the embodiment of the present application two provides；
Fig. 4 is a kind of schematic diagram for photovoltaic generating system that the embodiment of the present application three provides.
Specific embodiment
Flow control scheme is crossed using current, leads to reactive current one when abnormal or other reasons occurs in the load of circuit
When being directly persistently greater than level-one overcurrent value and being less than second level overcurrent value, existing scheme will not thorough locking pulse driving signal, but
Of short duration locking pulse driving signal releases the block to pulse drive signal, at this time when reactive current is lower than level-one overcurrent value
Reactive current can be greater than level-one overcurrent value again again, then again after of short duration locking pulse driving signal ... so circulation, meeting
Cause the size of the electric current of reactance to be continuously near level-one overcurrent value, then cause device heating in circuit serious, there is mistake
The risk of effect.
In order to solve the above-mentioned technical problem, method of flow control, equipment and system are crossed this application provides a kind of, when for the first time
When receiving level-one over-current signal, timer starts to carry out timing, while locking pulse driving signal, when judging level-one over-current signal
At the end of, delay preset time period is lifted a blockade pulse drive signal again, while indicating overcurrent time using the count value of counter
Number.When next time receives level-one over-current signal again, locking pulse driving signal, at the end of judging level-one over-current signal again, delay
Preset time period is lifted a blockade pulse drive signal again, and so on.Time when judging timer is greater than default
Threshold value or judge counter count value be greater than preset value N when, determine reactance occur continue overcurrent, within a preset period of time continue
Locking pulse driving signal no longer releases, thus reduces the risk to fail due to switching device seriously generates heat because continuing.
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only this
Invention a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall within the protection scope of the present invention.
Embodiment one:
The embodiment of the present application provides a kind of method of flow control excessively, illustrates with reference to the accompanying drawing.
Referring to Fig. 1, which is a kind of flow chart for crossing method of flow control that the embodiment of the present application one provides.
Method includes the following steps:
S101: when receiving level-one over-current signal for the first time, timer T starts to carry out timing, while locking pulse drives
Signal；At the end of judging level-one over-current signal, delay preset time period is lifted a blockade the pulse drive signal again, counter
It is started counting from 0 and counter adds 1.
Overcurrent in the embodiment of the present application refers to the reactance overcurrent of converter, the converter can for DC-DC converter or
DC-AC converter.When converter is DC-DC converter, overcurrent can refer to the reactance that the Boost circuit of converter includes
Stream.When converter is DC-AC converter, overcurrent can refer to the reactance that the compensation circuit of DC-AC converter output terminal includes
Stream.
The switching device that converter includes can be IGBT (Insulated Gate Bipolar Transistor, insulation
Grid bipolar junction transistor).
Default level-one overcurrent value is set, when the electric current of reactance is greater than the default level-one overcurrent value, it is believed that reactance occurred
Stream, the electric current of current reactance is characterized with level-one over-current signal, i.e., the electric current that level-one over-current signal corresponds to reactance is greater than default level-one
Overcurrent value.
When receiving level-one over-current signal for the first time, timer T starts timing, while locking pulse driving signal.The arteries and veins
Switch state of the driving signal for driving transducer switching device is rushed, blocking the pulse drive signal makes the derailing switch of converter
Part stops working, and the electric current of reactance at this time is gradually reduced.
At the end of judging level-one over-current signal, i.e., the electric current of reactance is less than default level-one overcurrent value, does not solve at once at this time
Except locking pulse driving signal, the pulse drive signal but preset time period that is delayed is lifted a blockade again, the preset time period
Conventional is microsecond rank, such as can be set to 10 μ s, and the application is not especially limited the preset time period, can by delay
Sufficient fall time is provided with the electric current for reactance.
When reactive current is lower than default level-one overcurrent value, pulse drive signal of lifting a blockade.It lifts a blockade arteries and veins for the first time
When rushing driving signal, counter is started counting from 0 and counter adds 1, and the count value of counter is to receive level-one over-current signal
Number, also be locking pulse driving signal and release locking pulse driving signal number.
S102: when next time receives level-one over-current signal again, locking pulse driving signal；Level-one over-current signal knot is judged again
Shu Shi, delay preset time period is lifted a blockade pulse drive signal again, and counter adds 1, and so on.
When being received again by level-one over-current signal, execution and identical treatment process in S101, and so on, i.e., each time
When detecting level-one over-current signal, first locking pulse driving signal, at the end of judging level-one over-current signal, when delay is default
Between Duan Houzai lift a blockade pulse drive signal, and counter adds 1.
S103: until judging that the time of T timing is greater than preset threshold or judges that the count value of counter is greater than preset value N
When, it presets lasting locking pulse driving signal in blocking time section and no longer releases；Otherwise timer and the counter are reset.
The preset threshold can be set to the working time that switching device is resistant in reactance overcurrent, default more than this
After threshold value, switching device may fail due to generating heat serious.When the time of timer T timing being greater than preset threshold, characterization
Within the time of preset threshold, circuit has been likely to occur failure and the electric current of reactance is caused to continue overcurrent, in order to prevent derailing switch
Part failure continues locking pulse driving signal in default blocking time section and no longer releases.
Preset value N can be set for the count value of counter, and N indicates to receive the maximum allowable number of level-one over-current signal.
When the count value of counter is greater than preset value N, i.e., there is the number of overcurrent beyond the maximum time allowed in the electric current of current reactance
Number, characterization are lifted a blockade every time after pulse drive signal, and the electric current of reactance always increases to greater than default level-one overcurrent value again,
Illustrate that circuit has been likely to occur failure and has caused reactive current lasting larger at this time, switching device fails in order to prevent, default
Continue locking pulse driving signal in blocking time section no longer to release.
When the time for judging T timing is less than or equal to preset threshold and judges that the count value of counter is less than or equal to preset value N
When, the overcurrent of characterization reactance at this time is effectively controlled processing, and switching device is dangerous without component failure, can be by timer and meter
Number device is reset.
The method that the prior art provides only just continues locking pulse driving letter when the electric current of reactance is higher than second level overcurrent value
Number, and when the electric current of reactance is greater than level-one overcurrent value and is less than second level overcurrent value, locking pulse driving signal can't be continued,
Therefore the switching device that may cause in circuit fails because seriously generating heat.And method provided by the embodiments of the present application, work as reactance
Electric current when being greater than default level-one overcurrent value, if the time for meeting timer T timing is greater than the counting of preset threshold or counter
Value is greater than preset value N, then default level-one overcurrent value can not be dropped to hereinafter, switching device at this time by characterizing reactive current and continuing overcurrent
There are the risks of failure, continue locking pulse driving signal no longer solution in default blocking time section at this time divided by protection converter
Switching device.
In conclusion using method provided by the embodiments of the present application, it, can be pre- when judging that overcurrent occurs continuing in reactance
If continuing locking pulse driving signal in the period no longer to release, the wind to fail due to switching device seriously generates heat because continuing is reduced
Danger.In one possible implementation, preset time period increases with the increase of the count value of counter, i.e., is sentencing every time
The delay carried out at the end of disconnected level-one over-current signal be longer than it is last judge the delay carried out at the end of level-one over-current signal, citing
It is described as follows:
At the end of judging level-one over-current signal for the first time, pulse drive signal of lifting a blockade after the 10 μ s that are delayed；Sentence for the second time
At the end of disconnected level-one over-current signal, pulse drive signal of lifting a blockade after the 20 μ s that are delayed, and so on, each preset time period increases
Add 10 μ s.
Certainly, only for convenience of understanding, the specific method of determination of preset time period is carried out matching according to the actual situation and be installed upper example
Fixed, the embodiment of the present application is not especially limited this.
By constantly increasing preset time period, sufficient fall time can be provided for the electric current of reactance, so that reactance is electric
Stream can be lower than default level-one overcurrent value, while also alleviating switching device persistent fever.Therefore, after extending preset time period
When the electric current of reactance continues to be more than default level-one overcurrent value, persistently there is overcurrent, derailing switch in the electric current of characterization reactance at this time
There is the risk of failure in part.
Further, default second level overcurrent value can also be set for reactance, which is greater than default level-one
Overcurrent value, when the electric current of reactance is greater than the default second level overcurrent value, it is believed that serious overcurrent, the electric current mistake of reactance occurs in reactance
May cause the switching device of converter greatly to fail rapidly, it is therefore desirable to locking pulse driving signal, at this time this method further include
Following steps:
When receiving second level over-current signal, continues locking pulse driving signal in default blocking time section and no longer release.
The electric current of current reactance is characterized with second level over-current signal, i.e., the electric current that second level over-current signal corresponds to reactance is greater than default
Second level overcurrent value.
It should be noted that the step of judging second level overcurrent in the judgement of level-one overcurrent while can carry out, i.e., with
S101-S103 can be carried out simultaneously, not have sequencing relationship.
The method of the embodiment of the present application additionally provides treatment measures when serious overcurrent occurs in reactance, by being arranged default two
Grade overcurrent value locking pulse driving signal can no longer be released when reactive current is greater than default second level overcurrent value, further be dropped
A possibility that low switching device failure.
Embodiment two:
What is provided based on the above embodiment crosses method of flow control, and the embodiment of the present application also provides the overcurrents of application this method
Equipment is controlled, is illustrated with reference to the accompanying drawing.
Referring to fig. 2, which is a kind of schematic diagram for crossing flow control device that the embodiment of the present application two provides.
This crosses flow control device 200 applied to converter 201, which includes reactance and switching device (in Fig. 2
It is not shown), converter 201 can be DC-DC converter or DC-AC converter.It includes: that electric current passes that this, which crosses flow control device 200,
Sensor 202, the first comparison circuit 203 and controller 204.
Current sensor 202 is used to detect the electric current of reactance, and the electric current of the reactance is specifically as follows what Boost circuit included
Reactive current can also be the reactive current that converter output terminal (such as compensation circuit of inverter) includes.
First comparison circuit 203 is for the electric current of reactance to be compared with default level-one overcurrent value, when the electric current of reactance
Level-one over-current signal is exported when greater than default level-one overcurrent value to controller 204.
When 204 first time of controller receiving level-one over-current signal, timer T starts to carry out timing, while locking pulse
Driving signal, since the pulse drive signal of switching device is blocked, electric current decline, MOS switch dissipation is alleviated.Work as control
At the end of device 204 processed judges level-one over-current signal, delay preset time period is lifted a blockade pulse drive signal again, and counter is from 0
It starts counting and counter adds 1.Wherein, pulse drive signal is used for the switch state of driving switch device.
When controller 204 is received again by level-one over-current signal, locking pulse driving signal again, when judging level-one again
At the end of over-current signal, delay preset time period is lifted a blockade pulse drive signal again, and counter adds 1.
And so on, controller 204 repeats above-mentioned process flow.
In one possible implementation, preset time period can be set to increase with the increase of counter, pass through increasing
Long preset time period provides enough fall time for reactive current, while avoiding reactive current continually and steadily default
Near level-one overcurrent value.
Until controller 204 judges the time of timer T timing greater than preset threshold or judges that the count value of counter is big
When preset value N, continues locking pulse driving signal in default blocking time section and no longer release；Otherwise the control meter of controller 204
When device and counter reset.
Flow control device is crossed using provided by the embodiments of the present application, can be sealed in time when level-one overcurrent persistently occurs in reactance
Pulse drive signal is locked, a possibility that switching device seriously generates heat because continuing and fails is thereby reduced.
Referring to Fig. 3, which is another schematic diagram for crossing flow control device that the embodiment of the present application two provides.
It crosses flow control device 300 shown in the figure to further comprise: the second comparison circuit 205.
Second comparison circuit 205 is for the electric current of reactance to be compared with default second level overcurrent value, when the electric current of reactance
Second level over-current signal is exported when greater than default second level overcurrent value to controller 204.
Controller 204 is preset in blocking time section when receiving second level over-current signal and continues locking pulse driving signal not
It releases again.Wherein, it presets second level overcurrent value and is greater than default level-one overcurrent value.
The device can block arteries and veins when reactive current is greater than default second level overcurrent value by the way that default second level overcurrent value is arranged
It rushes driving signal no longer to release, further reduced a possibility that switching device fails when serious overcurrent occurs in reactance.
Embodiment three:
The method of flow control excessively and mistake flow control device provided based on the above embodiment, the embodiment of the present application also provides one
Kind photovoltaic generating system, illustrates with reference to the accompanying drawing.
Referring to fig. 4, which is a kind of schematic diagram for photovoltaic generating system that the embodiment of the present application three provides.
The photovoltaic generating system 400 includes: converter 401 and flow control device 402 excessively.Wherein, converter 401 includes electricity
Anti- and switching device (not shown).
Flow control device 402 is crossed for detecting the electric current of reactance, when the electric current of reactance is defeated greater than when presetting level-one overcurrent value
Level-one over-current signal out, when receiving level-one over-current signal for the first time, timer T starts to carry out timing, while locking pulse drives
Dynamic signal；At the end of judging level-one over-current signal, delay preset time period is lifted a blockade pulse drive signal again, counter from
0 starts counting and counter adds 1, and pulse drive signal is used for the switch state of driving switch device.
Flow control device 402 is crossed when receiving level-one over-current signal again next time, locking pulse driving signal；One is judged again
At the end of grade over-current signal, delay preset time period is lifted a blockade pulse drive signal again, and counter adds 1, and so on.
In one possible implementation, preset time period can be set to increase with the increase of counter.By not
It is disconnected to increase preset time period, enough fall time is provided for reactive current, while avoiding reactive current continually and steadily pre-
If near level-one overcurrent value.
Flow control device 402 is crossed to be greater than preset threshold until judging the time of timer T timing or judge the meter of counter
When numerical value is greater than preset value N, continues locking pulse driving signal in default blocking time section and no longer release；Otherwise timer and meter
Number device is reset.
The mistake flow control device that photovoltaic generating system provided by the embodiments of the present application includes can persistently occur in reactance
When stream continue locking pulse driving signal no longer release, thereby reduce switching device because continue seriously generate heat due to fail can
Energy.
Further, crossing flow control device 402 can also be compared the electric current of reactance with default second level overcurrent value, when
The electric current of reactance exports second level over-current signal when being greater than default second level overcurrent value, when receiving second level over-current signal, presets block
The pulse drive signal is persistently blocked in period no longer to release.Wherein, it presets second level overcurrent value and is greater than default level-one overcurrent
Value.
The mistake flow control device of the system can be greater than default second level in reactive current by the way that default second level overcurrent value is arranged
Locking pulse driving signal no longer releases when overcurrent value, further reduced switching device mistake when serious overcurrent occurs in reactance
The possibility of effect.
Optionally, the converter 401 that photovoltaic generating system 400 includes can be DC-DC converter or DC-AC converter,
Wherein the switching device in converter 401 can be IGBT, or other kinds of switching device.
When converter is DC-DC converter, which is Boost circuit, for export photovoltaic module
Voltage exports after being boosted.
When converter is DC-AC converter, the DC inverter that DC-AC converter can export photovoltaic module is to hand over
Galvanic electricity is exported.
In addition, photovoltaic generating system can include simultaneously DC-DC converter and DC-AC converter, i.e., photovoltaic module is defeated
Outlet connects DC-DC converter, and the output end of DC-DC converter connects DC-AC converter.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
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 (12)
1. a kind of cross method of flow control, which is characterized in that be applied to converter, the converter includes reactance and switching device；
This method comprises:
When receiving level-one over-current signal for the first time, timer T starts to carry out timing, while locking pulse driving signal；When sentencing
Break at the end of the level-one over-current signal, delay preset time period is lifted a blockade the pulse drive signal again, and counter is opened from 0
Begin to count and counter adds 1；
When next time receives level-one over-current signal again, the pulse drive signal is blocked；The level-one over-current signal knot is judged again
Shu Shi, the preset time period that is delayed are lifted a blockade the pulse drive signal again, and counter adds 1；And so on；It is described
The electric current that level-one over-current signal corresponds to the reactance is greater than default level-one overcurrent value；
When judging that the time of the T timing is greater than preset threshold or judges the count value of the counter greater than preset value N,
The pulse drive signal is persistently blocked in default blocking time section no longer to release；Otherwise the timer and the counter are equal
It resets.
2. the method according to claim 1, wherein count value of the preset time period with the counter
Increase and increases.
3. method according to claim 1 or 2, which is characterized in that further include: when receiving second level over-current signal, preset
The pulse drive signal is persistently blocked in blocking time section no longer to release；The second level over-current signal corresponds to the electricity of the reactance
Stream is greater than default second level overcurrent value, and the default second level overcurrent value is greater than the default level-one overcurrent value.
4. method according to claim 1 or 2, which is characterized in that the converter is that DC-DC converter or DC-AC become
Parallel operation；
The switching device is insulated gate bipolar transistor IGBT.
5. a kind of cross flow control device, which is characterized in that be applied to converter, the converter includes reactance and switching device；
The equipment includes: current sensor, the first comparison circuit and controller；
The current sensor, for detecting the electric current of the reactance；
First comparison circuit, for the electric current of the reactance to be compared with default level-one overcurrent value, when the reactance
Electric current export the level-one over-current signal to the controller when being greater than the default level-one overcurrent value；
The controller, for when receiving level-one over-current signal for the first time, timer T to start to carry out timing, while blocking arteries and veins
Rush driving signal；At the end of judging the level-one over-current signal, delay preset time period is lifted a blockade the pulsed drive again
Signal, counter is started counting from 0 and counter adds 1；When next time receives level-one over-current signal again, the pulsed drive letter is blocked
Number；At the end of next time judges the level-one over-current signal, the preset time period that is delayed is lifted a blockade the pulsed drive again
Signal, and counter adds 1；And so on；Until judging the time of the T timing greater than preset threshold or judging the counter
Count value when being greater than preset value N, persistently block the pulse drive signal in default blocking time section and no longer release；Otherwise institute
It states timer and the counter is reset.
6. equipment according to claim 5, which is characterized in that the preset time period with the counter count value
Increase and increases.
7. equipment according to claim 5 or 6, which is characterized in that further include: the second comparison circuit；
Second comparison circuit, for the electric current of the reactance to be compared with default second level overcurrent value, when the reactance
Electric current export second level over-current signal to the controller when being greater than the default second level overcurrent value；
The controller, for persistently blocking the pulsed drive in default blocking time section when receiving second level over-current signal
Signal no longer releases；The default second level overcurrent value is greater than the default level-one overcurrent value.
8. a kind of photovoltaic generating system characterized by comprising converter and excessively flow control device；The converter includes electricity
Anti- and switching device；
It is described to cross flow control device, for detecting the electric current of the reactance；When the electric current of the reactance is greater than default level-one overcurrent
Level-one over-current signal is exported when value, when receiving the level-one over-current signal for the first time, timer T starts to carry out timing, simultaneously
Locking pulse driving signal；At the end of judging the level-one over-current signal, delay preset time period is lifted a blockade the arteries and veins again
Driving signal is rushed, counter is started counting from 0 and counter adds 1；When next time receives level-one over-current signal again, the pulse is blocked
Driving signal；At the end of next time judges the level-one over-current signal, the preset time period that is delayed is lifted a blockade the arteries and veins again
Driving signal is rushed, and counter adds 1；And so on；Until judging that the time of the T timing is greater than described in preset threshold or judgement
When the count value of counter is greater than preset value N, the pulse drive signal is persistently blocked in default blocking time section and is no longer released；
Otherwise the timer and the counter are reset.
9. system according to claim 8, which is characterized in that the preset time with the count value of the counter increasing
Add and increases.
10. system according to claim 8, which is characterized in that it is described to cross flow control device, it is also used to the reactance
Electric current is compared with default second level overcurrent value, exports second level when the electric current of the reactance is greater than the default second level overcurrent value
Over-current signal persistently blocks the pulse drive signal in default blocking time section and no longer solves when receiving second level over-current signal
It removes；The default second level overcurrent value is greater than the default level-one overcurrent value.
11. system according to claim 8, which is characterized in that the converter is that DC-DC converter or DC-AC are converted
Device；
The switching device is insulated gate bipolar transistor IGBT.
12. system according to claim 8, which is characterized in that when the converter is DC-DC converter, the DC-
DC converter is Boost circuit, and the voltage for exporting photovoltaic module exports after being boosted；
When the converter is DC-AC converter, the DC-AC converter, the direct current for exporting the photovoltaic module
Electric inversion is that alternating current is exported.
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| CN201910501516.7A CN110190586A (en) | 2019-06-11 | 2019-06-11 | It is a kind of to cross method of flow control, equipment and system |
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| CN201910501516.7A CN110190586A (en) | 2019-06-11 | 2019-06-11 | It is a kind of to cross method of flow control, equipment and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111987696A (en) * | 2020-08-06 | 2020-11-24 | 哈尔滨工程大学 | Overcurrent protection method for inductive current of digital control switching power supply |
| CN113328411A (en) * | 2021-05-27 | 2021-08-31 | 中国石油天然气股份有限公司 | Method and device for automatically cutting off power supply of power supply overhead line |
| CN116780478A (en) * | 2023-07-25 | 2023-09-19 | 深圳市正浩创新科技股份有限公司 | Overload protection method of inverter circuit and electronic equipment |
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