CN105186901A - Input voltage control method and device of five-level inverter - Google Patents
Input voltage control method and device of five-level inverter Download PDFInfo
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- CN105186901A CN105186901A CN201510560060.3A CN201510560060A CN105186901A CN 105186901 A CN105186901 A CN 105186901A CN 201510560060 A CN201510560060 A CN 201510560060A CN 105186901 A CN105186901 A CN 105186901A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 application provides an input voltage control method and device of a five-level inverter. According to the method, the switch-on state of a bypass diode is judged, an index voltage value of a corresponding Boost converter is pushed up after the action of arbitrary one bypass diode is judged so as to push up the voltage (the voltage on a third capacitor and a fourth capacitor) of a second level DC bus, and the voltage difference between the voltage (the voltage on a first capacitor and a second capacitor) of a first level DC bus and the voltage of the second level DC bus is enlarged. Therefore, the action of triggering the bypass diode is prevented, the situation that the voltage of first level DC bus is continuously oscillated and uncontrolled is further avoided, the symmetry of the input power of the five-level photovoltaic inverter is ensured, and the reliability of normal running of the five-level photovoltaic inverter is improved.
Description
Technical field
The application relates to technical field of photovoltaic power generation, more specifically, relates to a kind of five-electrical level inverter input voltage control method and device.
Background technology
In field of photovoltaic power generation, usually received the output voltage of cell panel by inverter, after inversion, its net side brachium pontis exports through alternating current filter filtering, then is connected with electrical network by transformer boost, and then realizes power supply.
fig. 1be depicted as the applied topology of five level photovoltaic inverters conventional in field of photovoltaic power generation
figure, there are two groups of DC buss in described five level photovoltaic inverters: the first level DC bus that the first electric capacity C1Pos and the second electric capacity C1Neg builds, and the second electrical level DC bus that the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg builds.First level DC busbar voltage, after the boosting of positive and negative two Boost, obtains second electrical level busbar voltage.In addition, cross-over connection positive and negative two diodes (the first diode D1 and the second diode D2) between two groups of DC buss, with ensure when cell panel output voltage higher than during described second electrical level busbar voltage by corresponding Boost bypass, thus to reduce the wastage.
But, when described first level DC busbar voltage and described second electrical level DC bus-bar voltage comparatively close to time, if there is fluctuation in described second electrical level DC bus mid-point voltage, then the just half polygonal voltage V1Pos of described first level DC bus may exceed the just half polygonal voltage V2Pos of described second electrical level DC bus, or the negative half polygonal voltage V1Neg of described first level DC bus may exceed the negative half polygonal voltage V2Neg of described second electrical level DC bus, thus make corresponding bypass diode action, during example V1Pos>V2Pos, first diode D1 action, and now because total described first level DC busbar voltage is still lower than described second electrical level DC bus-bar voltage, thus V1Neg<V2Neg, the second diode D2 can not action.And after the first diode D1 action, by the just half polygonal voltage V2Pos of the just half polygonal voltage V1Pos clamper of described first level DC bus to described second electrical level DC bus; Forward boost converter loses its function owing to being bypassed, and its electric current loop feedback cannot follow command voltage value; Now the second diode D2 is not operating, and thus negative sense boost converter is still controlled is in normal operating conditions.The power asymmetric that positive and negative half of boost converter outputs to described second electrical level DC bus exacerbates the vibration of described second electrical level DC bus mid point, thus cause the alternate conduction of positive and negative half of bypass diode, make described first level DC busbar voltage persistent oscillation not controlled, and then cause the vibration of described five level photovoltaic inverter input powers, described five level photovoltaic inverters cannot normally be run.
Summary of the invention
In view of this, this application provides a kind of five-electrical level inverter input voltage control method and device, in order to solve in prior art two groups of DC bus-bar voltage close to time may there is the problem that five level photovoltaic inverters cannot normally run.
For realizing described object, the technical scheme that the application provides is as follows:
A kind of five-electrical level inverter input voltage control method, be applied to photovoltaic inverting system, described photovoltaic inverting system comprises: be series at the first electric capacity between cell panel output and the second electric capacity, five-electrical level inverter, be series at the 3rd electric capacity between described five-electrical level inverter two inputs and the 4th electric capacity, be connected to the first diode between described first electric capacity and described 3rd electric capacity and the first Boost and the second diode be connected between described second electric capacity and described 4th electric capacity and the second Boost; Described first electric capacity is connected with two other input of described five-electrical level inverter with the two ends of the series arm of described second electric capacity, the anode of described first diode is connected with described first electric capacity, the anode of described second diode is connected with described 4th electric capacity, and described first electric capacity is connected with described first Boost, described second Boost, described 3rd electric capacity and the tie point of described 4th electric capacity and the 5th input of described five-electrical level inverter with the tie point of described second electric capacity; Described five-electrical level inverter input voltage control method comprises:
Judge the whether conducting of described first diode and described second diode;
When judging described first diode current flow, the command voltage value controlling described first Boost rises to pre-set limit with default slope;
When judging described second diode current flow, the command voltage value controlling described second Boost rises to described pre-set limit with described default slope.
Preferably, judge that the step of described first diode and described second diode whether conducting comprises:
Judge whether the first difference and the second difference are less than setting threshold; Described first difference is the difference that the voltage on described first electric capacity deducts the voltage on described 3rd electric capacity; Described second difference is the difference that the voltage on described second electric capacity deducts the voltage on described 4th electric capacity;
When described first difference is less than described setting threshold, judge the Voltage loop adjuster of described first Boost or electric current loop adjuster whether saturated; When Voltage loop adjuster or the electric current loop regulator saturation of described first Boost, judge described first diode current flow;
When described second difference is less than described setting threshold, judge the Voltage loop adjuster of described second Boost or electric current loop adjuster whether saturated; When Voltage loop adjuster or the electric current loop regulator saturation of described second Boost, judge described second diode current flow.
Preferably, described photovoltaic inverting system also comprises: with the first current sensor of described first Diode series, and with described and the second current sensor of Diode series; Judge that the step of described first diode and described second diode whether conducting comprises:
Judge whether described first current sensor and described second current sensor detect electric current;
When described first current sensor detects electric current, judge described first diode current flow; When described second current sensor detects electric current, judge described second diode current flow.
Preferably, the command voltage value controlling described first Boost also comprises rise to the step of pre-set limit with default slope after:
Detect and judge whether described first diode turns off;
When judging that described first diode turns off, the command voltage value controlling described first Boost drops to the command voltage value before rising with default slope.
Preferably, the command voltage value controlling described second Boost also comprises rise to the step of pre-set limit with default slope after:
Detect and judge whether described second diode turns off;
When judging that described second diode turns off, the command voltage value controlling described second Boost drops to the command voltage value before rising with default slope.
Preferably, also comprise after judging the step of described first diode current flow:
Record and judge whether the ON time of described first diode is greater than the first Preset Time;
When judging that the ON time of described first diode is greater than described first Preset Time, the command voltage value controlling described first Boost rises to pre-set limit with default slope.
Preferably, also comprise after judging the step of described second diode current flow:
Record and judge whether the ON time of described second diode is greater than the first Preset Time;
When judging that the ON time of described second diode is greater than described first Preset Time, the command voltage value controlling described second Boost rises to pre-set limit with default slope.
Preferably, also comprise after judging the step that described first diode turns off:
Record and judge whether the turn-off time of described first diode is greater than the second Preset Time;
When judging that the turn-off time of described first diode is greater than described first Preset Time, the command voltage value controlling described first Boost drops to the command voltage value before rising with default slope.
Preferably, also comprise after judging the step that described second diode turns off:
Record and judge whether the turn-off time of described second diode is greater than the second Preset Time;
When judging that the turn-off time of described second diode is greater than described second Preset Time, the command voltage value controlling described second Boost drops to the command voltage value before rising with default slope.
A kind of five-electrical level inverter input voltage control device, be applied to photovoltaic inverting system, described photovoltaic inverting system comprises:
Be series at the first electric capacity between cell panel output and the second electric capacity;
Five-electrical level inverter;
Be series at the 3rd electric capacity between described five-electrical level inverter two inputs and the 4th electric capacity;
Be connected to the first diode between described first electric capacity and described 3rd electric capacity and the first Boost;
Be connected to the second diode between described second electric capacity and described 4th electric capacity and the second Boost;
Wherein, described first electric capacity is connected with two other input of described five-electrical level inverter with the two ends of the series arm of described second electric capacity, the anode of described first diode is connected with described first electric capacity, the anode of described second diode is connected with described 4th electric capacity, and described first electric capacity is connected with described first Boost, described second Boost, described 3rd electric capacity and the tie point of described 4th electric capacity and the 5th input of described five-electrical level inverter with the tie point of described second electric capacity;
Described five-electrical level inverter input voltage control device adopts the arbitrary described input voltage of five-electrical level inverter input voltage control method to described five-electrical level inverter of claim 1 to 9 to control.
As known from the above, the described five-electrical level inverter input voltage control method that the application provides, by judging the conducting off state of bypass diode, after judging arbitrary bypass diode action, 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), first level DC busbar voltage (voltage on the first electric capacity and the second electric capacity) and the pressure reduction of described second electrical level DC bus-bar voltage are widened, avoids triggering bypass diode action; And then avoid the not controlled situation generation of described first level DC busbar voltage persistent oscillation, ensure that the symmetry of described five level photovoltaic inverter input powers, improve the normal reliability of operation of described five level photovoltaic inverter.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to use to required in embodiment or description of the prior art below
accompanying drawingbe briefly described, apparently, in the following describes
accompanying drawingonly the embodiment of the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, can also according to providing
accompanying drawingobtain other
accompanying drawing.
fig. 1for the applied topology of five level photovoltaic inverters that prior art provides
figure;
fig. 2for the five-electrical level inverter input voltage control method flow process that the embodiment of the present application provides
figure;
fig. 3for the five-electrical level inverter input voltage control method flow process that another embodiment of the application provides
figure;
fig. 4for the five-electrical level inverter input voltage control method flow process that another embodiment of the application provides
figure;
fig. 5for the five-electrical level inverter input voltage control method flow process that another embodiment of the application provides
figure;
fig. 6for the five-electrical level inverter input voltage control method flow process that another embodiment of the application provides
figure.
Embodiment
Below in conjunction with in the embodiment of the present application
accompanying drawing, be clearly and completely described the technical scheme in the embodiment of the present application, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, 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 application's protection.
This application provides a kind of five-electrical level inverter input voltage control method and device, in order to solve in prior art two groups of DC bus-bar voltage close to time may there is the problem that five level photovoltaic inverters cannot normally run.
Concrete, described five-electrical level inverter input voltage control method, is applied to photovoltaic inverting system, described photovoltaic inverting system
as Fig. 1shown in, comprising: be series at the first electric capacity C1Pos between cell panel output and the second electric capacity C1Neg, five-electrical level inverter, be series at the 3rd electric capacity C2Pos between described five-electrical level inverter two inputs and the 4th electric capacity C2Neg, be connected to the first diode D1 between the first electric capacity C1Pos and the 3rd electric capacity C2Pos and the first Boost and the second diode D2 be connected between the second electric capacity C1Neg and the 4th electric capacity C2Neg and the second Boost; First electric capacity C1Pos is connected with two other input of described five-electrical level inverter with the two ends of the series arm of the second electric capacity C1Neg, the anode of the first diode D1 is connected with the first electric capacity C1Pos, the anode of the second diode D2 is connected with the 4th electric capacity C2Neg, and the first electric capacity C1Pos is connected with described first Boost, described second Boost, the 3rd electric capacity C2Pos and the tie point of the 4th electric capacity C2Neg and the 5th input of described five-electrical level inverter with the tie point of the second electric capacity C1Neg; Described five-electrical level inverter input voltage control method
as Fig. 2shown in, comprising:
S101, judge the first diode D1 and the second diode D2 whether conducting;
S102, when the D1 conducting of judgement first diode, the command voltage value controlling described first Boost rises to pre-set limit with default slope;
S103, when the D2 conducting of judgement second diode, the command voltage value controlling described second Boost rises to described pre-set limit with described default slope.
fig. 1shown five-electrical level inverter is at MPPT (MaximumPowerPointTracking, maximum work point is followed the tracks of) under pattern, work in five level modes, the first switching tube S2Pos wherein, second switch pipe S1Pos, the 3rd switching tube S0, the 4th switching tube S1Neg and the 5th switching tube S2Neg alternation, export five level: V2Pos, V1Pos, 0 ,-V1Neg and V2Neg.
Cross-over connection bypass diode is distinguished at the two ends of described first Boost and described second Boost, can when the first level DC busbar voltage (voltage on the first electric capacity C1Pos and the second electric capacity C1Neg) exceeds second electrical level DC bus-bar voltage (voltage on the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg) by corresponding Boost bypass, to reduce the wastage.
Described first Boost and described second Boost control positive and negative described first level DC busbar voltage respectively and follow MPPT voltage instruction, and control described second electrical level d-c bus voltage value according to net side inverter modulation degree dynamic conditioning.
In concrete practical application, described pre-set limit is: the higher limit of described second electrical level DC bus-bar voltage during normal work.
The described five-electrical level inverter input voltage control method that the present embodiment provides, for avoid described first level DC busbar voltage and described second electrical level DC bus-bar voltage close to time, reasons such as the two or two level bus mid-point voltage (voltage at the tie point place of the 3rd electric capacity C2Pos and the 4th electric capacity C2Neg) fluctuation and to trigger the described first level DC busbar voltage vibration that bypass diode (the first diode D1 and the second diode D2) action causes out of control, continue to monitor and judge bypass diode conducting off state, if monitor arbitrary bypass diode action, then by raising the command voltage value of corresponding Boost, raise described second electrical level DC bus-bar voltage, the pressure reduction of described first level DC busbar voltage and described second electrical level DC bus-bar voltage is widened, avoid triggering bypass diode action, and then avoid the not controlled situation generation of described first level DC busbar voltage persistent oscillation, ensure that the symmetry of described five level photovoltaic inverter input powers, improve the normal reliability of operation of described five level photovoltaic inverter.
Preferably,
as Fig. 3shown in, step S101 comprises:
S201, judge whether the first difference and the second difference are less than setting threshold; Described first difference is the difference that the voltage on the first electric capacity C1Pos deducts the voltage on the 3rd electric capacity C2Pos; Described second difference is the difference that the voltage on the second electric capacity C1Neg deducts the voltage on the 4th electric capacity C2Neg;
S202, when described first difference is less than described setting threshold, judge the Voltage loop adjuster of described first Boost or electric current loop adjuster whether saturated; When Voltage loop adjuster or the electric current loop regulator saturation of described first Boost, judge the first diode D1 conducting;
S203, when described second difference is less than described setting threshold, judge the Voltage loop adjuster of described second Boost or electric current loop adjuster whether saturated; When Voltage loop adjuster or the electric current loop regulator saturation of described second Boost, judge the second diode D2 conducting.
fig. 3the determination methods of the first shown diode D1 and the second diode D2 whether conducting is realized by software programming, or also can be realized by signal wiring, now described photovoltaic inverting system also comprises: first current sensor of connecting with the first diode D1, and with described and the second current sensor of Diode series; Step S101 comprises:
Judge whether described first current sensor and described second current sensor detect electric current;
When described first current sensor detects electric current, judge the first diode D1 conducting; When described second current sensor detects electric current, judge the second diode D2 conducting.
The determination methods of the first diode D1 and the second diode D2 whether conducting can select above-mentioned two kinds of any one methods, and concrete selecting depending on its applied environment, can be not specifically limited herein.
Preferably,
as Fig. 4shown in, also comprise after step S102:
S104, detection judge whether the first diode D1 turns off;
S105, when judgement first diode D1 turns off, the command voltage value controlling described first Boost drops to the command voltage value before rising with default slope.
Preferably,
as Fig. 4shown in, also comprise after step S103:
S106, detection judge whether the second diode D2 turns off;
S107, when judgement second diode D2 turns off, the command voltage value controlling described second Boost drops to the command voltage value before rising with default slope.
The pressure reduction of described first level DC busbar voltage and described second electrical level DC bus-bar voltage is being widened, is avoiding and trigger bypass diode action; To be monitored to described bypass diode all not operating within a period of time after, command voltage value again by controlling corresponding Boost drops to the command voltage value before rising with default slope, controls described second electrical level DC bus-bar voltage and gets back to the value before raising.Make described first level DC busbar voltage and described second electrical level DC bus-bar voltage return to normal condition, and the conducting off state of monitoring two bypass diodes can be continued, improve the normal reliability of operation of described five level photovoltaic inverter.
Preferably,
as Fig. 5shown in, also comprise after step S101:
S401, record judge whether the ON time of the first diode D1 is greater than the first Preset Time;
When the ON time of judgement first diode D1 is greater than described first Preset Time, then perform step S102, the command voltage value controlling described first Boost rises to pre-set limit with default slope.
Preferably,
as Fig. 5shown in, also comprise after step S101:
S402, record judge whether the ON time of the second diode D2 is greater than described first Preset Time;
When the ON time of judgement second diode D2 is greater than described first Preset Time, then perform step S103, the command voltage value controlling described second Boost rises to pre-set limit with default slope.
Record for bypass diode ON time can realize by introducing diode current flow timer; When judging that the ON time of bypass diode is greater than described first Preset Time, the command voltage value just controlling corresponding Boost rises to pre-set limit with default slope, object increases the judgement time, prevent the erroneous judgement to bypass diode conducting state, so avoid because of transient state cause bypass diode of short duration open trigger described second electrical level DC bus-bar voltage instruction lifting control.
In concrete practical application, described first Preset Time is set as 10ms; Also can by described first Preset Time be set as that 0 is cancelled.
Preferably,
as Fig. 6shown in, also comprise after step S104:
S501, record judge whether the turn-off time of the first diode D1 is greater than the second Preset Time;
When the turn-off time of judgement first diode D1 is greater than described first Preset Time, then perform step S105, the command voltage value controlling described first Boost drops to the command voltage value before rising with default slope.
Preferably,
as Fig. 6shown in, also comprise after step S106:
S502, record judge whether the turn-off time of the second diode D2 is greater than described second Preset Time;
When the turn-off time of judgement second diode D2 is greater than described second Preset Time, then perform step S107, the command voltage value controlling described second Boost drops to the command voltage value before rising with default slope.
Record for the bypass diode turn-off time can realize by introducing diode shutoff timer, when judging that the turn-off time of bypass diode is greater than described second Preset Time, the command voltage value just controlling corresponding Boost drops to the command voltage value before rising with default slope, its objective is the erroneous judgement prevented bypass diode off state, and just reduce described second electrical level busbar voltage and the bypass diode caused recovers conducting again because bypass diode has just been deactivated.
In concrete practical application, described second Preset Time is set as 20ms; Also can by described second Preset Time be 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, is applied to photovoltaic inverting system, described photovoltaic inverting system
as Fig. 1shown in, comprising:
Be series at the first electric capacity C1Pos between cell panel output and the second electric capacity C1Neg;
Five-electrical level inverter;
Be series at the 3rd electric capacity C2Pos between described five-electrical level inverter two inputs and the 4th electric capacity C2Neg;
Be connected to the first diode D1 between the first electric capacity C1Pos and the 3rd electric capacity C2Pos and the first Boost;
Be connected to the second diode D2 between the second electric capacity C1Neg and the 4th electric capacity C2Neg and the second Boost;
Wherein, first electric capacity C1Pos is connected with two other input of described five-electrical level inverter with the two ends of the series arm of the second electric capacity C1Neg, the anode of the first diode D1 is connected with the first electric capacity C1Pos, the anode of the second diode D2 is connected with the 4th electric capacity C2Neg, and the first electric capacity C1Pos is connected with described first Boost, described second Boost, the 3rd electric capacity C2Pos and the tie point of the 4th electric capacity C2Neg and the 5th input of described five-electrical level inverter with the tie point of the second electric capacity C1Neg;
Described five-electrical level inverter input voltage control device adopts the arbitrary described input voltage of five-electrical level inverter input voltage control method to described five-electrical level inverter of Fig. 2 to Fig. 6 to control.
Concrete step and principle same as the previously described embodiments, repeat no more herein.
It should be noted that, each embodiment in this specification all 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 part mutually see.
Also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more limit values, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising above-mentioned key element and also there is other identical element.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.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 the spirit or scope of the application, can realize in other embodiments.Therefore, the application by limit value in these embodiments shown in this article, but can not will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a five-electrical level inverter input voltage control method, it is characterized in that, be applied to photovoltaic inverting system, described photovoltaic inverting system comprises: be series at the first electric capacity between cell panel output and the second electric capacity, five-electrical level inverter, be series at the 3rd electric capacity between described five-electrical level inverter two inputs and the 4th electric capacity, be connected to the first diode between described first electric capacity and described 3rd electric capacity and the first Boost and the second diode be connected between described second electric capacity and described 4th electric capacity and the second Boost; Described first electric capacity is connected with two other input of described five-electrical level inverter with the two ends of the series arm of described second electric capacity, the anode of described first diode is connected with described first electric capacity, the anode of described second diode is connected with described 4th electric capacity, and described first electric capacity is connected with described first Boost, described second Boost, described 3rd electric capacity and the tie point of described 4th electric capacity and the 5th input of described five-electrical level inverter with the tie point of described second electric capacity; Described five-electrical level inverter input voltage control method comprises:
Judge the whether conducting of described first diode and described second diode;
When judging described first diode current flow, the command voltage value controlling described first Boost rises to pre-set limit with default slope;
When judging described second diode current flow, the command voltage value controlling described second Boost rises to described pre-set limit with described default slope.
2. five-electrical level inverter input voltage control method according to claim 1, is characterized in that, judges that the step of described first diode and described second diode whether conducting comprises:
Judge whether the first difference and the second difference are less than setting threshold; Described first difference is the difference that the voltage on described first electric capacity deducts the voltage on described 3rd electric capacity; Described second difference is the difference that the voltage on described second electric capacity deducts the voltage on described 4th electric capacity;
When described first difference is less than described setting threshold, judge the Voltage loop adjuster of described first Boost or electric current loop adjuster whether saturated; When Voltage loop adjuster or the electric current loop regulator saturation of described first Boost, judge described first diode current flow;
When described second difference is less than described setting threshold, judge the Voltage loop adjuster of described second Boost or electric current loop adjuster whether saturated; When Voltage loop adjuster or the electric current loop regulator saturation of described second Boost, judge described second diode current flow.
3. five-electrical level inverter input voltage control method according to claim 1, it is characterized in that, described photovoltaic inverting system also comprises: with the first current sensor of described first Diode series, and with described and the second current sensor of Diode series; Judge that the step of described first diode and described second diode whether conducting comprises:
Judge whether described first current sensor and described second current sensor detect electric current;
When described first current sensor detects electric current, judge described first diode current flow; When described second current sensor detects electric current, judge described second diode current flow.
4. five-electrical level inverter input voltage control method according to claim 1, is characterized in that, the command voltage value controlling described first Boost also comprises rise to the step of pre-set limit with default slope after:
Detect and judge whether described first diode turns off;
When judging that described first diode turns off, the command voltage value controlling described first Boost drops to the command voltage value before rising with default slope.
5. five-electrical level inverter input voltage control method according to claim 1, is characterized in that, the command voltage value controlling described second Boost also comprises rise to the step of pre-set limit with default slope after:
Detect and judge whether described second diode turns off;
When judging that described second diode turns off, the command voltage value controlling described second Boost drops to the command voltage value before rising with default slope.
6. five-electrical level inverter input voltage control method according to claim 1, is characterized in that, also comprises after judging the step of described first diode current flow:
Record and judge whether the ON time of described first diode is greater than the first Preset Time;
When judging that the ON time of described first diode is greater than described first Preset Time, the command voltage value controlling described first Boost rises to pre-set limit with default slope.
7. five-electrical level inverter input voltage control method according to claim 1, is characterized in that, also comprises after judging the step of described second diode current flow:
Record and judge whether the ON time of described second diode is greater than the first Preset Time;
When judging that the ON time of described second diode is greater than described first Preset Time, the command voltage value controlling described second Boost rises to pre-set limit with default slope.
8. five-electrical level inverter input voltage control method according to claim 4, is characterized in that, also comprises after judging the step that described first diode turns off:
Record and judge whether the turn-off time of described first diode is greater than the second Preset Time;
When judging that the turn-off time of described first diode is greater than described first Preset Time, the command voltage value controlling described first Boost drops to the command voltage value before rising with default slope.
9. five-electrical level inverter input voltage control method according to claim 5, is characterized in that, also comprises after judging the step that described second diode turns off:
Record and judge whether the turn-off time of described second diode is greater than the second Preset Time;
When judging that the turn-off time of described second diode is greater than described second Preset Time, the command voltage value controlling described second Boost drops to the command voltage value before rising with default slope.
10. a five-electrical level inverter input voltage control device, is characterized in that, is applied to photovoltaic inverting system, and described photovoltaic inverting system comprises:
Be series at the first electric capacity between cell panel output and the second electric capacity;
Five-electrical level inverter;
Be series at the 3rd electric capacity between described five-electrical level inverter two inputs and the 4th electric capacity;
Be connected to the first diode between described first electric capacity and described 3rd electric capacity and the first Boost;
Be connected to the second diode between described second electric capacity and described 4th electric capacity and the second Boost;
Wherein, described first electric capacity is connected with two other input of described five-electrical level inverter with the two ends of the series arm of described second electric capacity, the anode of described first diode is connected with described first electric capacity, the anode of described second diode is connected with described 4th electric capacity, and described first electric capacity is connected with described first Boost, described second Boost, described 3rd electric capacity and the tie point of described 4th electric capacity and the 5th input of described five-electrical level inverter with the tie point of described second electric capacity;
Described five-electrical level inverter input voltage control device adopts the arbitrary described input voltage of five-electrical level inverter input voltage control method to described five-electrical level inverter of claim 1 to 9 to control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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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 |
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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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