CN107769601B - Mid-point voltage control method, device and the photovoltaic generating system of multi-level circuit - Google Patents
Mid-point voltage control method, device and the photovoltaic generating system of multi-level circuit Download PDFInfo
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- CN107769601B CN107769601B CN201711291050.XA CN201711291050A CN107769601B CN 107769601 B CN107769601 B CN 107769601B CN 201711291050 A CN201711291050 A CN 201711291050A CN 107769601 B CN107769601 B CN 107769601B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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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
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Abstract
The embodiment of the invention provides mid-point voltage control method, device and the photovoltaic generating systems of a kind of multi-level circuit, the mid-point voltage control method is applied to multi-level circuit, the voltage value of the first DC side input capacitance and the second DC side input capacitance is obtained first, then judge whether the voltage value is greater than the first preset threshold, if it is, controlling the original levels and establishing circuit stopping is that the flying capacitor charges, and the control multi-level circuit is in chop control state, to reduce the bus mid-point voltage.It can be seen that, mid-point voltage control method provided in this embodiment is when the voltage (bus mid-point voltage) for detecting input capacitance transfinites, control stops being that flying capacitor charges, and chop control is carried out to bus mid-point voltage, bus mid-point voltage is reduced, the phenomenon that DC side input capacitance leads to damage due to unbalance of neutral-point voltage is avoided.
Description
Technical field
The present invention relates to technical field of new energy power generation, and in particular to a kind of mid-point voltage controlling party of multi-level circuit
Method, device and photovoltaic generating system.
Background technique
Multi-level circuit has multiple voltage outputs, can adapt to electric power occasion wider in input voltage, higher.It is logical
Often, it in order to guarantee the output of multiple voltages, needs in advance to charge to flying capacitor.Specifically, as shown in FIG. 1, FIG. 1 is bands
Original levels establish the circuit diagram of five level circuit of ANPC type of device, wherein switch K and charging resistor R form initial electricity
It is flat to establish device, before normal operation circuit, pass through DC side input capacitance C1- switch K- charging resistor R- flying capacitor Cf-
Inversion unit forms charge circuit, charges for flying capacitor Cf, typically for five level circuit, needs the electricity that will suspend
The voltage for holding Cf is charged to (VC1+VC2)/4.
However, to flying capacitor Cf charge when, the conducting circuit of multi-level circuit as shown in heavy black in Fig. 2, by
It charges in the capacitor that DC side input capacitance C1 and C2 and flying capacitor Cf is same magnitude, therefore to flying capacitor Cf
When, the voltage carried on input capacitance C2 is larger, it will usually greater than the safe voltage of input capacitance C2, as shown in figure 3, leading in turn
The damage for causing input capacitance, reduces the reliability of photovoltaic generating system.
Therefore, mid-point voltage control method, device and the photovoltaic generating system of a kind of multi-level circuit how are provided, both
It is able to achieve and charges to flying capacitor, and can guarantee the balance of voltage of midpoint N, be those skilled in the art's big skill urgently to be resolved
Art problem.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of mid-point voltage control method of multi-level circuit, device and
Photovoltaic generating system had not only been able to achieve and had charged to flying capacitor, but also can guarantee the balance of voltage of midpoint N, avoided DC side input
The phenomenon that capacitor leads to damage due to unbalance of neutral-point voltage.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
A kind of mid-point voltage control method of multi-level circuit, is applied to multi-level circuit, and the multi-level circuit includes
First DC side input capacitance, the second DC side input capacitance, inversion unit, flying capacitor, LC filter and original levels
Establish circuit, wherein the first end of the first input end of the inversion unit and the first DC side input capacitance with
Bus positive voltage be connected, the first end of the second input terminal of the inversion unit and the second DC side input capacitance with
Bus negative voltage is connected, and the second of the second end of the first DC side input capacitance and the second DC side input capacitance
End is connected, and as bus midpoint and ground connection, the flying capacitor is attempted by the first output end and second of the inversion unit
Between output end, the original levels establish the first output for being electrically connected to the bus positive voltage and the inversion unit
Between end, the LC filter is electrically connected with the first output end of the inversion unit and the second output terminal of the inversion unit
It connects, the mid-point voltage control method includes:
Obtain the voltage value of the first DC side input capacitance and the second DC side input capacitance；
Judge whether the voltage value is greater than the first preset threshold, stops if so, controlling the original levels and establishing circuit
It only charges for the flying capacitor, and controls the multi-level circuit and be in chop control state, to reduce the bus midpoint
Voltage.
Optionally, further includes:
Obtain the voltage value of the first DC side input capacitance and the second DC side input capacitance；
The voltage value is judged whether less than the first preset threshold, if so, controlling the original levels and establishing circuit and be
The flying capacitor charging, and stop the control multi-level circuit and be in chop control state.
Optionally, further includes:
Obtain the voltage value of the flying capacitor；
Judge whether the voltage value of the flying capacitor is greater than default original levels, if so, controlling the original levels
It establishes circuit and stops being that the flying capacitor charges.
Optionally, the chop control state is by path in addition to the flying capacitor and the LC filter pair
The bus mid-point voltage carries out the control of bus neutral balance.
A kind of mid-point voltage control device of multi-level circuit, is applied to multi-level circuit, and the multi-level circuit includes
First DC side input capacitance, the second DC side input capacitance, inversion unit, flying capacitor, LC filter and original levels
Establish circuit, wherein the first end of the first input end of the inversion unit and the first DC side input capacitance with
Bus positive voltage be connected, the first end of the second input terminal of the inversion unit and the second DC side input capacitance with
Bus negative voltage is connected, and the second of the second end of the first DC side input capacitance and the second DC side input capacitance
End is connected, and as bus midpoint and ground connection, the flying capacitor is attempted by the first output end and second of the inversion unit
Between output end, the original levels establish the first output for being electrically connected to the bus positive voltage and the inversion unit
Between end, the LC filter is electrically connected with the first output end of the inversion unit and the second output terminal of the inversion unit
It connects, the mid-point voltage control device includes:
First obtains module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Voltage value；
First judgment module, for judging whether the voltage value is greater than the first preset threshold, if so, control is described just
Beginning level establishes circuit and stops being that the flying capacitor charges, and controls the multi-level circuit and be in chop control state, with
Reduce the bus mid-point voltage.
Optionally, further includes:
Second obtains module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Voltage value；
Second judgment module, for judging the voltage value whether less than the first preset threshold, if so, control is described just
Beginning level establishes circuit as flying capacitor charging, and stops the control multi-level circuit and be in chop control state.
Optionally, further includes:
Third obtains module, for obtaining the voltage value of the flying capacitor；
Third judgment module, for judging whether the voltage value of the flying capacitor is greater than default original levels, if so,
Controlling the original levels and establishing circuit stopping is that the flying capacitor charges.
Optionally, the chop control state is by path in addition to the flying capacitor and the LC filter pair
The bus mid-point voltage carries out the control of bus neutral balance.
A kind of photovoltaic generating system, including the above-mentioned mid-point voltage control device of any one.
Based on the above-mentioned technical proposal, the embodiment of the invention provides a kind of mid-point voltage control method of multi-level circuit,
Applied to multi-level circuit, which obtains the first DC side input capacitance and described second first
The voltage value of DC side input capacitance, then judges whether the voltage value is greater than the first preset threshold, if so, described in control
Original levels establish circuit and stop being that the flying capacitor charges, and controls the multi-level circuit and be in chop control state,
To reduce the bus mid-point voltage.As it can be seen that mid-point voltage control method provided in this embodiment is detecting input capacitance
When voltage (bus mid-point voltage) transfinites, control stops being that flying capacitor charges, and carries out chop control to bus mid-point voltage,
Bus mid-point voltage is reduced, the phenomenon that DC side input capacitance leads to damage due to unbalance of neutral-point voltage is avoided.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, 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 embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the circuit diagram that five level circuit of ANPC type of device is established with original levels；
Fig. 2 is the current trend figure that five level circuit of ANPC type of device is established with original levels；
Fig. 3 is V diagram when flying capacitor charges；
Fig. 4 is a kind of flow diagram of the mid-point voltage control method of multi-level circuit provided in an embodiment of the present invention；
Fig. 5 is a kind of current trend figure of five level circuits provided in an embodiment of the present invention；
Fig. 6 is the current trend figure of another five level circuit provided in an embodiment of the present invention；
Fig. 7 is the current trend figure of another five level circuit provided in an embodiment of the present invention；
Fig. 8 is the current trend figure of another five level circuit provided in an embodiment of the present invention；
Fig. 9 is the process signal of the mid-point voltage control method of another multi-level circuit provided in an embodiment of the present invention
Figure；
Figure 10 is the process signal of the mid-point voltage control method of another multi-level circuit provided in an embodiment of the present invention
Figure；
Figure 11 is V diagram when being charged using the flying capacitor after the present embodiment.
Specific embodiment
Referring to Fig. 4, Fig. 4 is a kind of mid-point voltage control method of multi-level circuit provided in this embodiment, the midpoint
Voltage control method is applied to multi-level circuit as shown in Figure 1, and the multi-level circuit includes the first DC side input capacitance
C1, the second DC side input capacitance C2, inversion unit 101, flying capacitor Cf, LC filter (shape after inductance L connects with capacitor C
At circuit) and original levels establish circuit 102.
Wherein, the first end of the first input end of the inversion unit 101 and the first DC side input capacitance C1
It is connected with bus positive voltage+Vdc/2, the second input terminal of the inversion unit and the second DC side input capacitance C2
First end be connected with bus negative voltage-Vdc/2, the second end and described second of the first DC side input capacitance C1
The second end of DC side input capacitance C2 is connected, as bus midpoint N and ground connection.
The flying capacitor Cf is attempted by between the first output end and second output terminal of the inversion unit, described first
Beginning level establish circuit 102 be connected to the bus positive voltage+Vdc/2 and the inversion unit 101 the first output end it
Between, the second output terminal electricity of the first output end and the inversion unit 101 of the LC filter and the inversion unit 101
Connection.
The mid-point voltage control method comprising steps of
S41, the voltage value for obtaining the first DC side input capacitance and the second DC side input capacitance；
S42, judge whether the voltage value is greater than the first preset threshold, if so, controlling the original levels establishes electricity
Road stops being that the flying capacitor charges, and controls the multi-level circuit and be in chop control state, to reduce the bus
Mid-point voltage.
Wherein, mid-point voltage control method provided in this embodiment obtains the voltage value of DC side input capacitance first, i.e.,
The voltage value of the voltage value of first DC side input capacitance C1 and the second DC side input capacitance C2, then judgement is got
Whether voltage value meets preset condition, for example, when the voltage value of the first DC side input capacitance C1 and the input of the second DC side
When the voltage value of capacitor C2 is greater than the first preset threshold, stop charging to the flying capacitor.Due at this point, bus mid-point voltage
Greater than the first preset threshold, it is therefore desirable to carry out decompression processing to bus mid-point voltage, i.e. control multi-level circuit is in copped wave
State of a control avoids DC side input capacitance since unbalance of neutral-point voltage leads to damage so that bus mid-point voltage reduces
Phenomenon.
It should be noted that in the present embodiment, not limiting the specific mistake how to be depressured to bus mid-point voltage
Journey, such as can be realized by the state of the switching tube in control multi-level circuit being switched on and off to bus mid-point voltage
It is depressured, it is, of course, also possible to achieve the effect that reduce bus mid-point voltage by way of adding external circuit.
Specifically, in the present embodiment, above-mentioned chop control state is preferably by the path in addition to the flying capacitor
And the LC filter carries out the control of bus neutral balance to the bus mid-point voltage.Figure 5-8 is please referred to, with five level
It is illustrated for circuit, wherein Fig. 5 and Fig. 6 is that five level are formed in the different switching tube combinative movements of positive half period
Current path, Fig. 7 and Fig. 8 are the current path that five level are formed in the different switching tube combinative movements of negative half-cycle.
It should be noted that inventor does not set up completion (i.e. on flying capacitor Cf in view of flying capacitor original levels
Voltage is not charged to VC1/4+VC2/4 also) and switching tube voltage stress require (generally for five level circuits, each switch
The withstanding voltage of pipe is lower than direct current maximum input voltage), therefore normal five-level switch magnetic logic, it is likely to result in switching tube
Q1, Q6 voltage stress are exceeded (Q1, Q6 bear voltage stress Vdc-Vcf, and when Vcf is smaller, Q1, Q6 bear nearly whole Vdc voltage).
Therefore chop control state in the present embodiment need to choose it is a kind of can trouble free service including whole switching tube full voltage ranges
Current path carries out the control of bus neutral balance.
Specifically, before flying capacitor original levels are not set up, positive half period chooses path unrelated with flying capacitor
Switch combination (current trend of heavy black in Fig. 5 and Fig. 6).Negative half-cycle chooses the switching group in path unrelated with flying capacitor
(current trend of heavy black in Fig. 7 and Fig. 8) is closed, each switching tube trouble free service in full voltage range is can satisfy, is completed at the same time
The control of bus midpoint.Therefore, during balancing midpoint, five level circuits work in the state in the unrelated path of flying capacitor.
On the basis of the above embodiments, mid-point voltage control method provided in this embodiment, as shown in figure 9, further including
Step:
S91, the voltage value for obtaining the first DC side input capacitance and the second DC side input capacitance；
S92, the voltage value is judged whether less than the first preset threshold, if so, controlling the original levels establishes electricity
Road is flying capacitor charging, and stops the control multi-level circuit and be in chop control state.
Since the voltage on flying capacitor Cf is not charged to VC1/4+VC2/4 also, the present embodiment is reducing input electricity
After voltage in appearance, continues control original levels and establish circuit as flying capacitor charging, also, stop at multilevel circuit
In chop control state.
Except this, as shown in Figure 10, on the basis of the above embodiments, mid-point voltage control method provided in this embodiment,
It further comprises the steps of:
S101, the voltage value for obtaining the flying capacitor；
S102, judge whether the voltage value of the flying capacitor is greater than default original levels, if so, control is described initial
Level establishes circuit and stops being that the flying capacitor charges.
When detecting that the voltage on flying capacitor Cf is charged to default original levels (VC1/4+VC2/4), control described first
Beginning level establishes circuit and stops being that the flying capacitor charges.
Schematically, as shown in figure 11, the charge and discharge process of mid-point voltage control method provided in this embodiment is as follows:
The t0 moment: the original levels of flying capacitor Cf are begun setting up；
T0~t1 stage: the level of flying capacitor Cf constantly establishes (increase), and the voltage at bus midpoint constantly deviates；
The t1 moment: triggering bus mid-point voltage over-voltage given threshold (the first preset threshold), flying capacitor Cf level stop
It establishes, is controlled into bus neutral balance；
T1~t2 stage: DC side input capacitance C1, C2 voltage constantly balances, and flying capacitor Cf level keeps relatively steady
It is fixed；
The t2 moment: bus neutral point voltage balance restores, and neutral balance control stops, and is again introduced into flying capacitor Cf level and builds
Vertical process；
T2~t5 stage: level foundation whether is completed according to flying capacitor Cf, control logic repeats above-mentioned t0~t2 stage.
As it can be seen that mid-point voltage control method provided in this embodiment is in voltage (the bus midpoint electricity for detecting input capacitance
Pressure) when transfiniting, control stops being that flying capacitor charges, and carries out chop control to bus mid-point voltage, reduces bus midpoint electricity
Pressure avoids the phenomenon that DC side input capacitance leads to damage due to unbalance of neutral-point voltage.
On the basis of the above embodiments, the present embodiment additionally provides a kind of mid-point voltage control dress of multi-level circuit
Set, be applied to multi-level circuit, the multi-level circuit include the first DC side input capacitance, the second DC side input capacitance,
Inversion unit, flying capacitor, LC filter and original levels establish circuit, wherein the first input end of the inversion unit
And the first end of the first DC side input capacitance is connected with bus positive voltage, the second input terminal of the inversion unit
And the first end of the second DC side input capacitance is connected with bus negative voltage, the first DC side input capacitance
The second end of second end and the second DC side input capacitance is connected, as bus midpoint and ground connection, the flying capacitor
It is attempted by between the first output end and second output terminal of the inversion unit, the original levels foundation is electrically connected to institute
It states between bus positive voltage and the first output end of the inversion unit, the first of the LC filter and the inversion unit
The electrical connection of the second output terminal of output end and the inversion unit, the mid-point voltage control device include:
First obtains module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Voltage value；
First judgment module, for judging whether the voltage value is greater than the first preset threshold, if so, control is described just
Beginning level establishes circuit and stops being that the flying capacitor charges, and controls the multi-level circuit and be in chop control state, with
Reduce the bus mid-point voltage.
Optionally, further includes:
Second obtains module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Voltage value；
Second judgment module, for judging the voltage value whether less than the first preset threshold, if so, control is described just
Beginning level establishes circuit as flying capacitor charging, and stops the control multi-level circuit and be in chop control state.
Optionally, further includes:
Third obtains module, for obtaining the voltage value of the flying capacitor；
Third judgment module, for judging whether the voltage value of the flying capacitor is greater than default original levels, if so,
Controlling the original levels and establishing circuit stopping is that the flying capacitor charges.
Wherein, the chop control state for by path in addition to the flying capacitor and the LC filter to institute
It states bus mid-point voltage and carries out the control of bus neutral balance.
Its working principle and technical effect refer to the working principle and technical effect of above method embodiment, herein
Not repeated description.
Except this, the present embodiment additionally provides a kind of photovoltaic generating system, including the above-mentioned mid-point voltage control of any one
Device.The working principle and technical effect of the photovoltaic generating system refer to the working principle of above-mentioned midpoint voltage-operated device
And technical effect, not repeated description herein.
To sum up, the embodiment of the invention provides mid-point voltage control method, device and the photovoltaics of a kind of multi-level circuit
Electricity generation system, the mid-point voltage control method be applied to multi-level circuit, obtain first the first DC side input capacitance with
And the voltage value of the second DC side input capacitance, then judge whether the voltage value is greater than the first preset threshold, if
It is to control the original levels to establish circuit stopping as flying capacitor charging, and the control multi-level circuit is in and cuts
Wave state of a control, to reduce the bus mid-point voltage.As it can be seen that mid-point voltage control method provided in this embodiment is detecting
When the voltage (bus mid-point voltage) of input capacitance transfinites, control stop be flying capacitor charge, and to bus mid-point voltage into
Row chop control reduces bus mid-point voltage, avoids DC side input capacitance since unbalance of neutral-point voltage leads to showing for damage
As.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of mid-point voltage control method of multi-level circuit, which is characterized in that be applied to multi-level circuit, more level
Circuit include the first DC side input capacitance, the second DC side input capacitance, inversion unit, flying capacitor, LC filter and
Original levels establish circuit, wherein the of the first input end of the inversion unit and the first DC side input capacitance
One end is connected with bus positive voltage, and the of the second input terminal of the inversion unit and the second DC side input capacitance
One end is connected with bus negative voltage, the second end of the first DC side input capacitance and second DC side input electricity
The second end of appearance is connected, and as bus midpoint and ground connection, the flying capacitor is attempted by the first output end of the inversion unit
And between second output terminal, the original levels, which are established, is electrically connected to the bus positive voltage and the inversion unit
Between first output end, the second of the first output end of the LC filter and the inversion unit and the inversion unit is defeated
Outlet electrical connection, the mid-point voltage control method include:
Obtain the voltage value of the first DC side input capacitance and the second DC side input capacitance；
Judge whether the voltage value is greater than the first preset threshold, if so, control the original levels establish circuit stopping be
The flying capacitor charging, and control the multi-level circuit and be in chop control state, to reduce the bus mid-point voltage.
2. mid-point voltage control method according to claim 1, which is characterized in that further include:
Obtain the voltage value of the first DC side input capacitance and the second DC side input capacitance；
The voltage value is judged whether less than the first preset threshold, if so, it is described for controlling the original levels to establish circuit
Flying capacitor charging, and stop the control multi-level circuit and be in chop control state.
3. mid-point voltage control method according to claim 2, which is characterized in that further include:
Obtain the voltage value of the flying capacitor；
Judge whether the voltage value of the flying capacitor is greater than default original levels, is established if so, controlling the original levels
Circuit stops being that the flying capacitor charges.
4. mid-point voltage control method according to claim 3, which is characterized in that the chop control state is by removing
Path and the LC filter outside the flying capacitor carry out the control of bus neutral balance to the bus mid-point voltage.
5. a kind of mid-point voltage control device of multi-level circuit, which is characterized in that be applied to multi-level circuit, more level
Circuit include the first DC side input capacitance, the second DC side input capacitance, inversion unit, flying capacitor, LC filter and
Original levels establish circuit, wherein the of the first input end of the inversion unit and the first DC side input capacitance
One end is connected with bus positive voltage, and the of the second input terminal of the inversion unit and the second DC side input capacitance
One end is connected with bus negative voltage, the second end of the first DC side input capacitance and second DC side input electricity
The second end of appearance is connected, and as bus midpoint and ground connection, the flying capacitor is attempted by the first output end of the inversion unit
And between second output terminal, the original levels, which are established, is electrically connected to the bus positive voltage and the inversion unit
Between first output end, the second of the first output end of the LC filter and the inversion unit and the inversion unit is defeated
Outlet electrical connection, the mid-point voltage control device include:
First obtains module, for obtaining the electricity of the first DC side input capacitance and the second DC side input capacitance
Pressure value；
First judgment module, for judging whether the voltage value is greater than the first preset threshold, if so, the control initial electricity
Flat circuit of establishing stops charging for the flying capacitor, and controls the multi-level circuit and be in chop control state, to reduce
The bus mid-point voltage.
6. mid-point voltage control device according to claim 5, which is characterized in that further include:
Second obtains module, for obtaining the electricity of the first DC side input capacitance and the second DC side input capacitance
Pressure value；
Second judgment module, for judging the voltage value whether less than the first preset threshold, if so, the control initial electricity
Flat circuit of establishing stops the control multi-level circuit and is in chop control state for flying capacitor charging.
7. mid-point voltage control device according to claim 6, which is characterized in that further include:
Third obtains module, for obtaining the voltage value of the flying capacitor；
Third judgment module, for judging whether the voltage value of the flying capacitor is greater than default original levels, if so, control
The original levels establish circuit and stop being that the flying capacitor charges.
8. mid-point voltage control device according to claim 7, which is characterized in that the chop control state is by removing
Path and the LC filter outside the flying capacitor carry out the control of bus neutral balance to the bus mid-point voltage.
9. a kind of photovoltaic generating system, which is characterized in that including the mid-point voltage control as described in any one of claim 5-8
Device processed.
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