CN105186901B - A kind of five-electrical level inverter input voltage control method and device - Google Patents
A kind of five-electrical level inverter input voltage control method and device Download PDFInfo
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- CN105186901B CN105186901B CN201510560060.3A CN201510560060A CN105186901B CN 105186901 B CN105186901 B CN 105186901B CN 201510560060 A CN201510560060 A CN 201510560060A CN 105186901 B CN105186901 B CN 105186901B
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The five-electrical level inverter input voltage control method and device that the application is provided, by the conducting off state for judging bypass diode, after any bypass diode action is judged, then by raising the command voltage value of corresponding Boost, raise second electrical level DC bus-bar voltage (voltage on the 3rd electric capacity and the 4th electric capacity), the pressure difference of first level DC busbar voltage (voltage on the first electric capacity and the second electric capacity) and the second electrical level DC bus-bar voltage is widened, it is to avoid triggering bypass diode action；And then avoid the uncontrolled situation of the first level DC busbar voltage persistent oscillation and occur, it is ensured that the five level photovoltaic inverters input power it is symmetrical, improve the normal reliability of operation of five level photovoltaic inverters.
Description
Technical field
The application is related to technical field of photovoltaic power generation, is controlled more particularly, to a kind of five-electrical level inverter input voltage
Method and device.
Background technology
In field of photovoltaic power generation, the output voltage of cell panel, its net side bridge after inversion are generally received by inverter
Arm output is filtered through alternating current filter, then is connected by transformer boost with power network, and then realizes power supply.
Fig. 1 show the applied topology figure for five level photovoltaic inverters commonly used in field of photovoltaic power generation, five level
There are two groups of dc bus in photovoltaic DC-to-AC converter：The first level DC that first electric capacity C1Pos and the second electric capacity C1Neg is built is female
Line, and the second electrical level dc bus that the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg is built.First level DC bus electricity
Press after the boosting Jing Guo positive and negative two Boosts, obtain second electrical level busbar voltage.In addition, in two groups of dc bus
Between bridged positive and negative two diodes (the first diode D1 and the second diode D2), with ensure when cell panel output voltage
Corresponding Boost is bypassed during higher than the second electrical level busbar voltage, so as to reduce loss.
But, when the first level DC busbar voltage and the second electrical level DC bus-bar voltage are closer to,
If there is fluctuation, just half polygonal voltage of the first level DC bus in the second electrical level dc bus mid-point voltage
V1Pos may exceed the just half polygonal voltage V2Pos of the second electrical level dc bus, or the first level DC bus
Minus half polygonal voltage V1Neg may exceed the minus half polygonal voltage V2Neg of the second electrical level dc bus, so that corresponding other
Road diode action, example V1Pos>During V2Pos, the first diode D1 actions；And now due to total first level DC
Busbar voltage is still less than the second electrical level DC bus-bar voltage, thus V1Neg<V2Neg, the second diode D2 will not be moved
Make.And after the first diode D1 actions, by the just half polygonal voltage V1Pos clampers of the first level DC bus to described second
The just half polygonal voltage V2Pos of level DC bus；Positive boost converters lose its function due to being bypassed, and its electric current loop is anti-
Feedback can not follow command voltage value；Now the second diode D2 is not operating, thus negative sense boost converters are still controlled in normal
Working condition.The power asymmetric that positive and negative half of boost converters are output to the second electrical level dc bus exacerbates described
The vibration at second electrical level dc bus midpoint, so as to cause the alternate conduction of positive and negative half of bypass diode so that described first
Level DC busbar voltage persistent oscillation is uncontrolled, has in turn resulted in the vibration of the five level photovoltaic inverters input power,
So that five level photovoltaic inverter can not normally be run.
The content of the invention
In view of this, this application provides a kind of five-electrical level inverter input voltage control method and device, to solve
The problem of five level photovoltaic inverters can not normally be run is likely to occur when two groups of DC bus-bar voltages are close in the prior art.
To realize the purpose, the technical scheme that the application is provided is as follows：
A kind of five-electrical level inverter input voltage control method, applied to photovoltaic inverting system, the photovoltaic inverting system
Including：The first electric capacity and the second electric capacity that are series between cell panel output end, five-electrical level inverter, it is series at five level
The 3rd electric capacity and the 4th electric capacity between two inputs of inverter, it is connected between first electric capacity and the 3rd electric capacity
The first diode and the first Boost and the two or two pole that is connected between second electric capacity and the 4th electric capacity
Pipe and the second Boost；The two ends of the series arm of first electric capacity and second electric capacity and five level are inverse
Two other input for becoming device is connected, and the anode of first diode is connected with first electric capacity, the two or two pole
The anode of pipe is connected with the 4th electric capacity, the tie point of first electric capacity and second electric capacity and the first Boost
Converter, second Boost, the tie point and five level inverse conversion of the 3rd electric capacity and the 4th electric capacity
5th input of device is connected；The five-electrical level inverter input voltage control method includes：
Judge whether first diode and second diode turn on；
When judging first diode current flow, the command voltage value of first Boost is controlled with default
Slope rises to pre-set limit；
When judging second diode current flow, the command voltage value of second Boost is controlled with described
Default slope rises to the pre-set limit.
It is preferred that, judge that the step of whether first diode and second diode turn on includes：
Judge whether the first difference is less than given threshold with the second difference；First difference is on first electric capacity
Voltage subtracts the difference of the voltage on the 3rd electric capacity；Second difference subtracts described for the voltage on second electric capacity
The difference of voltage on 4th electric capacity；
When first difference is less than the given threshold, the Voltage loop regulation of first Boost is judged
Device or electric current loop adjuster whether saturation；When the Voltage loop adjuster or electric current loop of first Boost are adjusted
During device saturation, first diode current flow is judged；
When second difference is less than the given threshold, the Voltage loop regulation of second Boost is judged
Device or electric current loop adjuster whether saturation；When the Voltage loop adjuster or electric current loop of second Boost are adjusted
During device saturation, second diode current flow is judged.
It is preferred that, the photovoltaic inverting system also includes：With the first current sensor of first Diode series, and
With described and the second current sensor of Diode series；Judge whether first diode and second diode lead
Logical step includes：
Judge whether first current sensor and second current sensor detect electric current；
When first current sensor detects electric current, first diode current flow is judged；When the described second electricity
When flow sensor detects electric current, second diode current flow is judged.
It is preferred that, control the command voltage value of first Boost to rise to pre-set limit with default slope
Also include after step：
Detect and judge whether first diode turns off；
When judging the first diode shut-off, the command voltage value of first Boost is controlled with default
The command voltage value that slope is dropped to before rising.
It is preferred that, control the command voltage value of second Boost to rise to pre-set limit with default slope
Also include after step：
Detect and judge whether second diode turns off；
When judging the second diode shut-off, the command voltage value of second Boost is controlled with default
The command voltage value that slope is dropped to before rising.
It is preferred that, also include after the step of judging first diode current flow：
Record and judge whether the ON time of first diode is more than the first preset time；
When the ON time for judging first diode is more than first preset time, control described first
The command voltage value of Boost rises to pre-set limit with default slope.
It is preferred that, also include after the step of judging second diode current flow：
Record and judge whether the ON time of second diode is more than the first preset time；
When the ON time for judging second diode is more than first preset time, control described second
The command voltage value of Boost rises to pre-set limit with default slope.
It is preferred that, judge also to include after the step of first diode is turned off：
Record and judge whether the turn-off time of first diode is more than the second preset time；
When the turn-off time for judging first diode being more than first preset time, control described first
The command voltage value that the command voltage value of Boost is dropped to before rising with default slope.
It is preferred that, judge also to include after the step of second diode is turned off：
Record and judge whether the turn-off time of second diode is more than the second preset time；
When the turn-off time for judging second diode being more than second preset time, control described second
The command voltage value that the command voltage value of Boost is dropped to before rising with default slope.
A kind of five-electrical level inverter input voltage control device, applied to photovoltaic inverting system, the photovoltaic inverting system
Including：
It is series at the first electric capacity and the second electric capacity between cell panel output end；
Five-electrical level inverter；
It is series at the 3rd electric capacity and the 4th electric capacity between described two inputs of five-electrical level inverter；
The first diode being connected between first electric capacity and the 3rd electric capacity and the first Boost；
The second diode being connected between second electric capacity and the 4th electric capacity and the second Boost；
Wherein, the two ends of the series arm of first electric capacity and second electric capacity and the five-electrical level inverter is another
Outer two inputs are connected, and the anode of first diode is connected with first electric capacity, the anode of second diode
It is connected with the 4th electric capacity, the tie point of first electric capacity and second electric capacity and first Boost, institute
State the 5th of the second Boost, the tie point of the 3rd electric capacity and the 4th electric capacity and the five-electrical level inverter
Input is connected；
The five-electrical level inverter input voltage control device is using any five described level inverse conversions of claim 1 to 9
Device input voltage control method is controlled to the input voltage of the five-electrical level inverter.
As known from the above, the five-electrical level inverter input voltage control method that the application is provided, by judging to bypass
The conducting off state of diode, after any bypass diode action is judged, then by raising corresponding Boost
Command voltage value, raises second electrical level DC bus-bar voltage (voltage on the 3rd electric capacity and the 4th electric capacity), and the first level is straight
The pressure difference of stream busbar voltage (voltage on the first electric capacity and the second electric capacity) and the second electrical level DC bus-bar voltage is widened, and is kept away
Exempt from triggering bypass diode action；And then avoid the uncontrolled situation hair of the first level DC busbar voltage persistent oscillation
It is raw, it is ensured that the five level photovoltaic inverters input power it is symmetrical, improve five level photovoltaic inverter and normally transport
Capable reliability.
Brief description of the drawings
, below will be to embodiment or existing in order to illustrate more clearly of the embodiment of the present application or technical scheme of the prior art
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of application, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
The applied topology figure for five level photovoltaic inverters that Fig. 1 provides for prior art；
The five-electrical level inverter input voltage control method flow chart that Fig. 2 provides for the embodiment of the present application；
The five-electrical level inverter input voltage control method flow chart that Fig. 3 provides for another embodiment of the application；
The five-electrical level inverter input voltage control method flow chart that Fig. 4 provides for another embodiment of the application；
The five-electrical level inverter input voltage control method flow chart that Fig. 5 provides for another embodiment of the application；
The five-electrical level inverter input voltage control method flow chart that Fig. 6 provides for another embodiment of the application.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
This application provides a kind of five-electrical level inverter input voltage control method and device, to solve in the prior art
Two groups of DC bus-bar voltages are likely to occur the problem of five level photovoltaic inverters can not normally be run when close.
Specifically, the five-electrical level inverter input voltage control method, applied to photovoltaic inverting system, the photovoltaic is inverse
Change system as shown in figure 1, including：It is series at the first electric capacity C1Pos and the second electric capacity C1Neg, five between cell panel output end
Electrical level inverter, the 3rd electric capacity C2Pos and the 4th electric capacity being series between described two inputs of five-electrical level inverter
C2Neg, the first diode D1 being connected between the first electric capacity C1Pos and the 3rd electric capacity C2Pos and the first Boost and
The second diode D2 being connected between the second electric capacity C1Neg and the 4th electric capacity C2Neg and the second Boost；First electricity
The two ends of series arm for holding C1Pos and the second electric capacity C1Neg are connected with two other input of the five-electrical level inverter,
First diode D1 anode is connected with the first electric capacity C1Pos, and the second diode D2 anode is connected with the 4th electric capacity C2Neg,
First electric capacity C1Pos and the second electric capacity C1Neg tie point are converted with first Boost, the 2nd Boost
5th input of device, the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg tie point and the five-electrical level inverter is connected；Institute
State five-electrical level inverter input voltage control method as shown in Fig. 2 including：
S101, judge whether the first diode D1 and the second diode D2 turn on；
S102, when judging the first diode D1 conductings, control the command voltage value of first Boost with pre-
If slope rises to pre-set limit；
S103, when judging the second diode D2 conductings, control the command voltage value of second Boost with institute
State default slope and rise to the pre-set limit.
Five-electrical level inverter shown in Fig. 1 is in MPPT (Maximum Power Point Tracking, the tracking of maximum work point)
Under pattern, five level modes, first switch pipe S2Pos therein, second switch pipe S1Pos, the 3rd switching tube S0, are worked in
Four switching tube S1Neg and the 5th switching tube S2Neg alternations, export five level：V2Pos, V1Pos, 0 ,-V1Neg and
V2Neg。
The two ends of first Boost and second Boost have bridged bypass diode respectively, can
It is straight to exceed second electrical level in the first level DC busbar voltage (voltage on the first electric capacity C1Pos and the second electric capacity C1Neg)
Corresponding Boost is bypassed during stream busbar voltage (voltage on the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg), with
Reduction loss.
First Boost and second Boost control positive and negative first level DC respectively
Busbar voltage follows MPPT voltage instructions, and controls the second electrical level d-c bus voltage value according to net side inverter modulation degree
Dynamic adjustment.
In specific practical application, the pre-set limit is：Second electrical level DC bus-bar voltage during normal work
Higher limit.
The five-electrical level inverter input voltage control method that the present embodiment is provided, to avoid first level DC
When busbar voltage and the close second electrical level DC bus-bar voltage, the two or two level bus mid-point voltage (the 3rd electric capacity C2Pos
With the voltage at the 4th electric capacity C2Neg tie point) fluctuation etc. reason and trigger bypass diode (the first diode D1 and second
Diode D2) action cause the first level DC busbar voltage vibration it is out of control, continue to monitor and judge that bypass diode is led
Logical off state, if any bypass diode action is monitored, by the command voltage for raising corresponding Boost
Value, raises the second electrical level DC bus-bar voltage, by the first level DC busbar voltage and the second electrical level direct current
The pressure difference of busbar voltage is widened, it is to avoid triggering bypass diode action；And then avoid the first level DC busbar voltage
The uncontrolled situation of persistent oscillation occurs, it is ensured that the five level photovoltaic inverters input power it is symmetrical, improve described
The normal reliability of operation of five level photovoltaic inverters.
It is preferred that, as shown in figure 3, step S101 includes：
S201, judge whether the first difference and the second difference are less than given threshold；First difference is the first electric capacity
Voltage on C1Pos subtracts the difference of the voltage on the 3rd electric capacity C2Pos；Second difference is on the second electric capacity C1Neg
Voltage subtracts the difference of the voltage on the 4th electric capacity C2Neg；
S202, when first difference be less than the given threshold when, judge the Voltage loop of first Boost
Adjuster or electric current loop adjuster whether saturation；When the Voltage loop adjuster or electric current loop of first Boost
During adjuster saturation, judge that the first diode D1 is turned on；
S203, when second difference be less than the given threshold when, judge the Voltage loop of second Boost
Adjuster or electric current loop adjuster whether saturation；When the Voltage loop adjuster or electric current loop of second Boost
During adjuster saturation, judge that the second diode D2 is turned on.
The determination methods whether the first diode D1 and the second diode D2 shown in Fig. 3 turn on be by software programming come
Realize, or can also be realized by hardware connection, now the photovoltaic inverting system also includes：With the first diode D1
First current sensor of series connection, and with described the and the second current sensor of Diode series；Step S101 includes：
Judge whether first current sensor and second current sensor detect electric current；
When first current sensor detects electric current, judge that the first diode D1 is turned on；When second electric current
When sensor detects electric current, judge that the second diode D2 is turned on.
The determination methods whether the first diode D1 and the second diode D2 turn on can from above two any one
Method, specific selection can be herein not specifically limited depending on its application environment.
It is preferred that, as shown in figure 4, also including after step S102：
S104, detect and judge whether the first diode D1 turns off；
S105, when judging the first diode D1 shut-offs, control the command voltage value of first Boost with pre-
If the command voltage value that slope is dropped to before rising.
It is preferred that, as shown in figure 4, also including after step S103：
S106, detect and judge whether the second diode D2 turns off；
S107, when judging the second diode D2 shut-offs, control the command voltage value of second Boost with pre-
If the command voltage value that slope is dropped to before rising.
Widened by the pressure difference of the first level DC busbar voltage and the second electrical level DC bus-bar voltage, it is to avoid
The action of triggering bypass diode；It is to be monitored it is not operating within a period of time to the bypass diode after, then pass through and control
The command voltage value of corresponding Boost controls described second to preset the command voltage value that slope is dropped to before rising
The value that level DC busbar voltage is returned to before raising.So that the first level DC busbar voltage and the second electrical level direct current
Busbar voltage returns to normal condition, and can continue to monitor the conducting off state of two bypass diodes, improves described
The normal reliability of operation of five level photovoltaic inverters.
It is preferred that, as shown in figure 5, also including after step S101：
Whether S401, the ON time for recording and judging the first diode D1 are more than the first preset time；
When the ON time for judging the first diode D1 is more than first preset time, then step S102 is performed, controlled
Make the command voltage value of first Boost and pre-set limit is risen to default slope.
It is preferred that, as shown in figure 5, also including after step S101：
Whether S402, the ON time for recording and judging the second diode D2 are more than first preset time；
When the ON time for judging the second diode D2 is more than first preset time, then step S103 is performed, controlled
Make the command voltage value of second Boost and pre-set limit is risen to default slope.
It can be realized for the record of bypass diode ON time by introducing diode current flow timer；Work as judgement
When the ON time of bypass diode is more than first preset time, the command voltage of corresponding Boost is just controlled
Value rises to pre-set limit with default slope, it is therefore an objective to increases the judgement time, prevents the erroneous judgement to bypass diode conducting state,
And then avoid bypass diode is of short duration caused by transient state from opening the instruction lifting control for triggering the second electrical level DC bus-bar voltage
System.
In specific practical application, first preset time is set as 10ms；Can also be by pre- by described first
If the time is set as that 0 is cancelled.
It is preferred that, as shown in fig. 6, also including after step S104：
Whether S501, the turn-off time for recording and judging the first diode D1 are more than the second preset time；
When the turn-off time for judging the first diode D1 being more than first preset time, then step S105 is performed, controlled
The command voltage value of first Boost is made to preset the command voltage value that slope is dropped to before rising.
It is preferred that, as shown in fig. 6, also including after step S106：
Whether S502, the turn-off time for recording and judging the second diode D2 are more than second preset time；
When the turn-off time for judging the second diode D2 being more than second preset time, then step S107 is performed, controlled
The command voltage value of second Boost is made to preset the command voltage value that slope is dropped to before rising.
It can be realized for the record of bypass diode turn-off time by introducing diode shut-off timer, work as judgement
When the turn-off time of bypass diode is more than second preset time, the command voltage of corresponding Boost is just controlled
Value is to preset the command voltage value that slope is dropped to before rising, the purpose is to prevent the erroneous judgement to bypass diode off state,
With because bypass diode just exited work just reduce the second electrical level busbar voltage and caused by bypass diode recover to lead again
It is logical.
In specific practical application, second preset time is set as 20ms；Can also be by pre- by described second
If the time is set as that 0 is cancelled.
Another embodiment of the present invention additionally provides a kind of five-electrical level inverter input voltage control device, inverse applied to photovoltaic
Change system, the photovoltaic inverting system as shown in figure 1, including：
It is series at the first electric capacity C1Pos and the second electric capacity C1Neg between cell panel output end；
Five-electrical level inverter；
It is series at the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg between described two inputs of five-electrical level inverter；
The first diode D1 being connected between the first electric capacity C1Pos and the 3rd electric capacity C2Pos and the first Boost conversion
Device；
The second diode D2 being connected between the second electric capacity C1Neg and the 4th electric capacity C2Neg and the 2nd Boost conversion
Device；
Wherein, the two ends of the first electric capacity C1Pos and the second electric capacity C1Neg series arm and the five-electrical level inverter
Two other input be connected, the first diode D1 anode is connected with the first electric capacity C1Pos, the second diode D2 anode and
4th electric capacity C2Neg is connected, the first electric capacity C1Pos and the second electric capacity C1Neg tie point and first Boost,
Second Boost, the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg tie point and the five-electrical level inverter
5th input is connected；
The five-electrical level inverter input voltage control device is defeated using any described five-electrical level inverters of Fig. 2 to Fig. 6
Enter voltage control method to be controlled the input voltage of the five-electrical level inverter.
Specific step and principle is same as the previously described embodiments, and here is omitted.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation be all between difference with other embodiment, each embodiment identical similar part mutually referring to.
It should also be noted that, herein, such as first and second or the like relational terms are used merely to one
Entity or operation make a distinction with another entity or operation, and not necessarily require or imply between these entities or operation
There is any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to contain
Lid nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the case of not more limit values, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including above-mentioned key element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the application.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from spirit herein or scope.Therefore, the application
Will not be by limit value in the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
1. a kind of five-electrical level inverter input voltage control method, it is characterised in that applied to photovoltaic inverting system, the photovoltaic
Inversion system includes：The first electric capacity and the second electric capacity that are series between cell panel output end, five-electrical level inverter, it is series at institute
State the 3rd electric capacity and the 4th electric capacity between two inputs of five-electrical level inverter, be connected in parallel in first electric capacity and described
The first diode and the first Boost between 3rd electric capacity and it is connected in parallel in second electric capacity and the 4th electricity
The second diode and the second Boost between appearance；The two of the series arm of first electric capacity and second electric capacity
End is connected with two other input of the five-electrical level inverter, the anode of first diode and first electric capacity
Anode is connected, and the anode of second diode is connected with the negative terminal of the 4th electric capacity, first electric capacity and described second
The tie point of electric capacity and first Boost, second Boost, the 3rd electric capacity and the described 4th
5th input of the tie point of electric capacity and the five-electrical level inverter is connected；The five-electrical level inverter input voltage controlling party
Method includes：
Judge whether first diode and second diode turn on；
When judging first diode current flow, control the command voltage value of first Boost to preset slope
Rise to pre-set limit；
When judging second diode current flow, the command voltage value of second Boost is controlled with described default
Slope rises to the pre-set limit.
2. five-electrical level inverter input voltage control method according to claim 1, it is characterised in that judge described first
The step of whether diode and second diode turn on includes：
Judge whether the first difference is less than given threshold with the second difference；First difference is the voltage on first electric capacity
Subtract the difference of the voltage on the 3rd electric capacity；Second difference is that the voltage on second electric capacity subtracts the described 4th
The difference of voltage on electric capacity；
When first difference be less than the given threshold when, judge first Boost Voltage loop adjuster or
Person's electric current loop adjuster whether saturation；When the Voltage loop adjuster or electric current loop adjuster of first Boost are satisfied
And when, judge first diode current flow；
When second difference be less than the given threshold when, judge second Boost Voltage loop adjuster or
Person's electric current loop adjuster whether saturation；When the Voltage loop adjuster or electric current loop adjuster of second Boost are satisfied
And when, judge second diode current flow.
3. five-electrical level inverter input voltage control method according to claim 1, it is characterised in that the photovoltaic inversion
System also includes：With the first current sensor of first Diode series, and second with second Diode series
Current sensor；Judge that the step of whether first diode and second diode turn on includes：
Judge whether first current sensor and second current sensor detect electric current；
When first current sensor detects electric current, first diode current flow is judged；When second electric current is passed
When sensor detects electric current, second diode current flow is judged.
4. five-electrical level inverter input voltage control method according to claim 1, it is characterised in that control described first
Also include after the step of command voltage value of Boost rises to pre-set limit with default slope：
Detect and judge whether first diode turns off；
When judging the first diode shut-off, control the command voltage value of first Boost to preset slope
The command voltage value dropped to before rising.
5. five-electrical level inverter input voltage control method according to claim 1, it is characterised in that control described second
Also include after the step of command voltage value of Boost rises to pre-set limit with default slope：
Detect and judge whether second diode turns off；
When judging the second diode shut-off, control the command voltage value of second Boost to preset slope
The command voltage value dropped to before rising.
6. five-electrical level inverter input voltage control method according to claim 1, it is characterised in that judge described first
Also include after the step of diode current flow：
Record and judge whether the ON time of first diode is more than the first preset time；
When the ON time for judging first diode is more than first preset time, the first Boost is controlled to become
The command voltage value of parallel operation rises to pre-set limit with default slope.
7. five-electrical level inverter input voltage control method according to claim 1, it is characterised in that judge described second
Also include after the step of diode current flow：
Record and judge whether the ON time of second diode is more than the first preset time；
When the ON time for judging second diode is more than first preset time, the 2nd Boost is controlled to become
The command voltage value of parallel operation rises to pre-set limit with default slope.
8. five-electrical level inverter input voltage control method according to claim 4, it is characterised in that judge described first
Also include after the step of diode is turned off：
Record and judge whether the turn-off time of first diode is more than the second preset time；
When the turn-off time for judging first diode being more than second preset time, the first Boost is controlled to become
The command voltage value that the command voltage value of parallel operation is dropped to before rising with default slope.
9. five-electrical level inverter input voltage control method according to claim 5, it is characterised in that judge described second
Also include after the step of diode is turned off：
Record and judge whether the turn-off time of second diode is more than the second preset time；
When the turn-off time for judging second diode being more than second preset time, the 2nd Boost is controlled to become
The command voltage value that the command voltage value of parallel operation is dropped to before rising with default slope.
10. a kind of five-electrical level inverter input voltage control device, it is characterised in that applied to photovoltaic inverting system, the light
Volt inversion system includes：
It is series at the first electric capacity and the second electric capacity between cell panel output end；
Five-electrical level inverter；
It is series at the 3rd electric capacity and the 4th electric capacity between described two inputs of five-electrical level inverter；
The first diode being connected between first electric capacity and the 3rd electric capacity and the first Boost；
The second diode being connected between second electric capacity and the 4th electric capacity and the second Boost；
Wherein, the two ends of the series arm of first electric capacity and second electric capacity and other the two of the five-electrical level inverter
Individual input is connected, and the anode of first diode is connected with first electric capacity, the anode of second diode and institute
State the 4th electric capacity to be connected, the tie point of first electric capacity and second electric capacity and first Boost, described the
5th input of two Boosts, the tie point of the 3rd electric capacity and the 4th electric capacity and the five-electrical level inverter
End is connected；
The five-electrical level inverter input voltage control device is defeated using any described five-electrical level inverter of claim 1 to 9
Enter voltage control method to be controlled the input voltage of the five-electrical level inverter.
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Citations (3)
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|---|---|---|---|---|
| EP2053732A2 (en) * | 2007-06-06 | 2009-04-29 | REFU Elektronik GmbH | Switch assembly and actuating method for an inverter with boost converter |
| CN101902145A (en) * | 2009-05-28 | 2010-12-01 | 通用电气公司 | Solar inverter and control method |
| CN102510234A (en) * | 2011-11-10 | 2012-06-20 | 珠海天兆新能源技术有限公司 | Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter |
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| US9413268B2 (en) * | 2012-05-10 | 2016-08-09 | Futurewei Technologies, Inc. | Multilevel inverter device and method |
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|---|---|---|---|---|
| EP2053732A2 (en) * | 2007-06-06 | 2009-04-29 | REFU Elektronik GmbH | Switch assembly and actuating method for an inverter with boost converter |
| CN101902145A (en) * | 2009-05-28 | 2010-12-01 | 通用电气公司 | Solar inverter and control method |
| CN102510234A (en) * | 2011-11-10 | 2012-06-20 | 珠海天兆新能源技术有限公司 | Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter |
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