CN107769601A - 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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- CN107769601A CN107769601A CN201711291050.XA CN201711291050A CN107769601A CN 107769601 A CN107769601 A CN 107769601A CN 201711291050 A CN201711291050 A CN 201711291050A CN 107769601 A CN107769601 A CN 107769601A
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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
-
- 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
-
- 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
-
- 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]
-
- 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 embodiments of the invention provide mid-point voltage control method, device and the photovoltaic generating system of a kind of multi-level circuit, the mid-point voltage control method is applied to multi-level circuit, the magnitude of voltage of the first DC side input capacitance and the second DC side input capacitance is obtained first, then judge whether the magnitude of voltage is more than the first predetermined threshold value, if, control the original levels to establish circuit to stop charging for the flying capacitor, and the control multi-level circuit is in chop control state, to reduce the bus mid-point voltage.It can be seen that, the mid-point voltage control method that the present embodiment provides is when the voltage (bus mid-point voltage) for detecting input capacitance transfinites, stopping is controlled to be charged for flying capacitor, and chop control is carried out to bus mid-point voltage, bus mid-point voltage is reduced, avoids DC side input capacitance because unbalance of neutral-point voltage causes the phenomenon of damage.
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 technology
Multi-level circuit has multiple voltage outputs, can adapt in wider, the higher electric power occasion of input voltage.It is logical
Often, in order to ensure the output of multiple voltages, it is necessary to be charged in advance to flying capacitor.Specifically, as shown in figure 1, Fig. 1 is band
Original levels establish the circuit diagram of the level circuit of ANPC types five of device, wherein, switch K and charging resistor R forms initial electricity
It is flat to establish device, before normal operation circuit, K- charging resistor R- flying capacitors Cf- is switched by DC side input capacitance C1-
Inversion unit forms charge circuit, is charged for flying capacitor Cf, typically for five level circuit, it is necessary to the electricity that will suspend
The voltage for holding Cf is charged to (VC1+VC2)/4.
However, when being charged to flying capacitor Cf, the conducting loop of its multi-level circuit as shown in heavy black in Fig. 2, by
Charged in the electric capacity 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 more than input capacitance C2 safe voltage, as shown in figure 3, and then leading
The damage of input capacitance is caused, 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 can realize and flying capacitor is charged, and can ensures the midpoint N balance of voltage, is those skilled in the art's big skill urgently to be resolved hurrily
Art problem.
The content of the invention
In view of this, the embodiments of the invention provide a kind of mid-point voltage control method of multi-level circuit, device and
Photovoltaic generating system, it can realize and flying capacitor is charged, and can ensures the midpoint N balance of voltage, avoids DC side input
Electric capacity causes the phenomenon of damage due to unbalance of neutral-point voltage.
To achieve the above object, the embodiment of the present invention provides following technical scheme：
A kind of mid-point voltage control method of multi-level circuit, applied to multi-level circuit, the multi-level circuit includes
First DC side input capacitance, the second DC side input capacitance, inversion unit, flying capacitor, LC wave filters 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 is connected, the first end of the second input 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 wave filters are electrically connected with the first output end of the inversion unit and the second output end of the inversion unit
Connect, the mid-point voltage control method includes：
Obtain the magnitude of voltage of the first DC side input capacitance and the second DC side input capacitance；
Judge whether the magnitude of voltage is more than the first predetermined threshold value, stop if it is, controlling the original levels to establish circuit
Only charged for the flying capacitor, and control the multi-level circuit to be in chop control state, to reduce the bus midpoint
Voltage.
Optionally, in addition to：
Obtain the magnitude of voltage of the first DC side input capacitance and the second DC side input capacitance；
Judge whether the magnitude of voltage is less than the first predetermined threshold value, if it is, controlling the original levels to establish circuit to be
The flying capacitor charging, and stop controlling the multi-level circuit to be in chop control state.
Optionally, in addition to：
Obtain the magnitude of voltage of the flying capacitor；
Judge whether the magnitude of voltage of the flying capacitor is more than default original levels, if it is, controlling the original levels
Circuit is established to stop charging for the flying capacitor.
Optionally, the chop control state is to pass through the path in addition to the flying capacitor and the LC wave filters pair
The bus mid-point voltage carries out bus neutral balance control.
A kind of mid-point voltage control device of multi-level circuit, applied to multi-level circuit, the multi-level circuit includes
First DC side input capacitance, the second DC side input capacitance, inversion unit, flying capacitor, LC wave filters 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 is connected, the first end of the second input 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 wave filters are electrically connected with the first output end of the inversion unit and the second output end of the inversion unit
Connect, the mid-point voltage control device includes：
First acquisition module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Magnitude of voltage；
First judge module, for judging whether the magnitude of voltage is more than the first predetermined threshold value, if it is, control is described just
Beginning level establishes circuit and stops charging for the flying capacitor, and controls the multi-level circuit to be in chop control state, with
Reduce the bus mid-point voltage.
Optionally, in addition to：
Second acquisition module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Magnitude of voltage；
Second judge module, for judging whether the magnitude of voltage is less than the first predetermined threshold value, if it is, control is described just
Beginning level is established circuit and charged for the flying capacitor, and stops controlling the multi-level circuit to be in chop control state.
Optionally, in addition to：
3rd acquisition module, for obtaining the magnitude of voltage of the flying capacitor；
3rd judge module, for judging whether the magnitude of voltage of the flying capacitor is more than default original levels, if it is,
Control the original levels to establish circuit to stop charging for the flying capacitor.
Optionally, the chop control state is to pass through the path in addition to the flying capacitor and the LC wave filters pair
The bus mid-point voltage carries out bus neutral balance control.
A kind of photovoltaic generating system, including the mid-point voltage control device that any one is above-mentioned.
Based on above-mentioned technical proposal, the embodiments of the invention provide a kind of mid-point voltage control method of multi-level circuit,
Applied to multi-level circuit, the mid-point voltage control method obtains the first DC side input capacitance and described second first
The magnitude of voltage of DC side input capacitance, then judges whether the magnitude of voltage is more than the first predetermined threshold value, if it is, described in control
Original levels establish circuit and stop charging for the flying capacitor, and control the multi-level circuit to be in chop control state,
To reduce the bus mid-point voltage.It can be seen that the mid-point voltage control method that the present embodiment provides is detecting input capacitance
When voltage (bus mid-point voltage) transfinites, control stopping to be charged for flying capacitor, and chop control carried out to bus mid-point voltage,
Bus mid-point voltage is reduced, avoids DC side input capacitance because unbalance of neutral-point voltage causes the phenomenon of damage.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, 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.
Fig. 1 is the circuit diagram for the level circuit of ANPC types five that device is established with original levels；
Fig. 2 is the current trend figure for the level circuit of ANPC types five that device is established with original levels；
Fig. 3 is V diagram when flying capacitor charges；
Fig. 4 is a kind of schematic flow sheet 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 flow 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 flow 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.
Embodiment
Referring to Fig. 4, Fig. 4 is a kind of mid-point voltage control method for multi-level circuit that the present embodiment provides, 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 wave filter (shape after inductance L connects with electric capacity C
Into circuit) and original levels establish circuit 102.
Wherein, the first input end of the inversion unit 101 and the first DC side input capacitance C1 first end
It is connected with bus positive voltage+Vdc/2, the second input 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
DC side input capacitance C2 the second end is connected, as bus midpoint N and ground connection.
The flying capacitor Cf is attempted by between the first output end and the second output end 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 LC wave filters and the first output end of the inversion unit 101 and the second output end electricity of the inversion unit 101
Connection.
The mid-point voltage control method includes step：
S41, the magnitude of voltage for obtaining the first DC side input capacitance and the second DC side input capacitance；
S42, judge whether the magnitude of voltage is more than the first predetermined threshold value, if it is, controlling the original levels to establish electricity
Road stops charging for the flying capacitor, and controls the multi-level circuit to be in chop control state, to reduce the bus
Mid-point voltage.
Wherein, the mid-point voltage control method that the present embodiment provides obtains the magnitude of voltage of DC side input capacitance first, i.e.,
The magnitude of voltage of first DC side input capacitance C1 magnitude of voltage and the second DC side input capacitance C2, then judge what is got
Whether magnitude of voltage meets preparatory condition, for example, when the first DC side input capacitance C1 magnitude of voltage and the input of the second DC side
When electric capacity C2 magnitude of voltage is more than the first predetermined threshold value, stop charging to the flying capacitor.Due to now, bus mid-point voltage
More than the first pre-set threshold value, it is therefore desirable to carry out decompression processing to bus mid-point voltage, that is, control multi-level circuit to be in copped wave
State of a control so that bus mid-point voltage reduces, and avoids DC side input capacitance because unbalance of neutral-point voltage causes damage
Phenomenon.
It should be noted that in the present embodiment, do not limit how the specific mistake being depressured to bus mid-point voltage
Journey, such as can be realized by controlling the state being switched on and off of the switching tube in multi-level circuit to bus mid-point voltage
It is depressured, it is, of course, also possible to by way of setting up external circuit, reaches the effect reduced to bus mid-point voltage.
Specifically, in the present embodiment, above-mentioned chop control state is preferably by the path in addition to the flying capacitor
And the LC wave filters carry out bus neutral balance control to the bus mid-point voltage.Fig. 5-Fig. 8 is referred to, with five level
It is illustrated exemplified by circuit, wherein, Fig. 5 and Fig. 6 are 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 requirement (generally for five level circuits, each switch
The withstanding voltage of pipe is less 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 voltages).
Therefore the 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, carry out bus neutral balance control.
Specifically, before flying capacitor original levels are not set up, positive half period, path unrelated with flying capacitor is chosen
Switch combination (current trend of heavy black in Fig. 5 and Fig. 6).Negative half-cycle, choose the switches set 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 can be met, completed simultaneously
Bus midpoint controls.Therefore, during midpoint is balanced, five level circuits work in the state in the unrelated path of flying capacitor.
On the basis of above-described embodiment, the mid-point voltage control method of the present embodiment offer, as shown in figure 9, also including
Step：
S91, the magnitude of voltage for obtaining the first DC side input capacitance and the second DC side input capacitance；
S92, judge whether the magnitude of voltage is less than the first predetermined threshold value, if it is, controlling the original levels to establish electricity
Road is charged for the flying capacitor, and stops controlling the multi-level circuit to be in chop control state.
Because the voltage on flying capacitor Cf is not charged to VC1/4+VC2/4 also, therefore, the present embodiment is reducing input electricity
After voltage in appearance, continue to control original levels to 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 above-described embodiment, the present embodiment provide mid-point voltage control method,
Also include step：
S101, the magnitude of voltage for obtaining the flying capacitor；
S102, judge whether the magnitude of voltage of the flying capacitor is more than default original levels, if it is, control is described initial
Level establishes circuit and stops charging for the flying capacitor.
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 charging for the flying capacitor.
Schematically, as shown in figure 11, the charge and discharge process for the mid-point voltage control method that the present embodiment provides is as follows：
The t0 moment：Begin setting up flying capacitor Cf original levels；
T0~t1 stages：Flying capacitor Cf level is constantly established (increase), and the voltage at bus midpoint is constantly offset；
The t1 moment：Bus mid-point voltage overvoltage given threshold (the first predetermined threshold value) is triggered, flying capacitor Cf level stops
Establish, controlled into bus neutral balance；
T1~t2 stages：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 recovers, and neutral balance control stops, and is again introduced into flying capacitor Cf level and builds
Vertical process；
T2~t5 stages：Level foundation whether is completed according to flying capacitor Cf, control logic repeats above-mentioned t0~t2 stages.
It can be seen that the mid-point voltage control method that the present embodiment provides is detecting voltage (the bus midpoint electricity of input capacitance
Pressure) when transfiniting, control stopping to be charged for flying capacitor, and chop control is carried out to bus mid-point voltage, it is electric to reduce bus midpoint
Pressure, DC side input capacitance is avoided because unbalance of neutral-point voltage causes the phenomenon of damage.
On the basis of above-described embodiment, the present embodiment additionally provides a kind of mid-point voltage control dress of multi-level circuit
Put, 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 wave filters 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 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
Second end and the second end of the second DC side input capacitance are connected, as bus midpoint and ground connection, the flying capacitor
It is attempted by between the first output end and the second output end of the inversion unit, the original levels are established and are electrically connected to institute
State between bus positive voltage and the first output end of the inversion unit, the LC wave filters and the first of the inversion unit
Output end and the electrical connection of the second output end of the inversion unit, the mid-point voltage control device include：
First acquisition module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Magnitude of voltage；
First judge module, for judging whether the magnitude of voltage is more than the first predetermined threshold value, if it is, control is described just
Beginning level establishes circuit and stops charging for the flying capacitor, and controls the multi-level circuit to be in chop control state, with
Reduce the bus mid-point voltage.
Optionally, in addition to：
Second acquisition module, for obtaining the first DC side input capacitance and the second DC side input capacitance
Magnitude of voltage；
Second judge module, for judging whether the magnitude of voltage is less than the first predetermined threshold value, if it is, control is described just
Beginning level is established circuit and charged for the flying capacitor, and stops controlling the multi-level circuit to be in chop control state.
Optionally, in addition to：
3rd acquisition module, for obtaining the magnitude of voltage of the flying capacitor；
3rd judge module, for judging whether the magnitude of voltage of the flying capacitor is more than default original levels, if it is,
Control the original levels to establish circuit to stop charging for the flying capacitor.
Wherein, the chop control state for by the path in addition to the flying capacitor and the LC wave filters to institute
State bus mid-point voltage and carry out bus neutral balance control.
Its operation principle and technique effect refer to the operation principle and technique effect of above method embodiment, herein
Not repeated description.
Except this, the present embodiment additionally provides a kind of photovoltaic generating system, including the mid-point voltage control that any one is above-mentioned
Device.The operation principle and technique effect of the photovoltaic generating system refer to the operation principle of above-mentioned mid-point voltage control device
And technique effect, not repeated description herein.
To sum up, the embodiments of the invention provide mid-point voltage control method, device and the photovoltaic of a kind of multi-level circuit
Electricity generation system, the mid-point voltage control method are applied to multi-level circuit, obtain first the first DC side input capacitance with
And the magnitude of voltage of the second DC side input capacitance, then judge whether the magnitude of voltage is more than the first predetermined threshold value, if
It is to control the original levels to establish circuit to stop charging for the flying capacitor, and controls the multi-level circuit to be in and cut
Ripple state of a control, to reduce the bus mid-point voltage.It can be seen that the mid-point voltage control method that the present embodiment provides is detecting
When the voltage (bus mid-point voltage) of input capacitance transfinites, stopping is controlled to be charged for flying capacitor, and enter to bus mid-point voltage
Row chop control, bus mid-point voltage is reduced, avoid DC side input capacitance because unbalance of neutral-point voltage causes showing for damage
As.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.For device disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Professional further appreciates that, with reference to the unit of each example of the embodiments described herein description
And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software, the composition and step of each example are generally described according to function in the above description.These
Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical scheme.Specialty
Technical staff can realize described function using distinct methods to each specific application, but this realization should not
Think beyond the scope of this invention.
Directly it can be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor
Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), internal 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, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for 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, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (9)
- A kind of 1. mid-point voltage control method of multi-level circuit, it is characterised in that 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 wave filters 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 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 held is connected, and as bus midpoint and ground connection, the flying capacitor is attempted by the first output end of the inversion unit And second between output end, the original levels, which are established, is electrically connected to the bus positive voltage and the inversion unit Between first output end, the first output end of the LC wave filters and the inversion unit and the second of the inversion unit defeated Go out end electrical connection, the mid-point voltage control method includes：Obtain the magnitude of voltage of the first DC side input capacitance and the second DC side input capacitance；Judge whether the magnitude of voltage is more than the first predetermined threshold value, if it is, control the original levels establish circuit stop be The flying capacitor charging, and control the multi-level circuit to be in chop control state, to reduce the bus mid-point voltage.
- 2. mid-point voltage control method according to claim 1, it is characterised in that also include：Obtain the magnitude of voltage of the first DC side input capacitance and the second DC side input capacitance；Judge whether the magnitude of voltage is less than the first predetermined threshold value, if it is, it is described to control the original levels to establish circuit Flying capacitor charges, and stops controlling the multi-level circuit to be in chop control state.
- 3. mid-point voltage control method according to claim 2, it is characterised in that also include：Obtain the magnitude of voltage of the flying capacitor；Judge whether the magnitude of voltage of the flying capacitor is more than default original levels, if it is, controlling the original levels to establish Circuit stops charging for the flying capacitor.
- 4. mid-point voltage control method according to claim 3, it is characterised in that the chop control state be by except Path and the LC wave filters outside the flying capacitor carry out bus neutral balance control to the bus mid-point voltage.
- A kind of 5. mid-point voltage control device of multi-level circuit, it is characterised in that 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 wave filters 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 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 held is connected, and as bus midpoint and ground connection, the flying capacitor is attempted by the first output end of the inversion unit And second between output end, the original levels, which are established, is electrically connected to the bus positive voltage and the inversion unit Between first output end, the first output end of the LC wave filters and the inversion unit and the second of the inversion unit defeated Go out end electrical connection, the mid-point voltage control device includes：First acquisition module, for obtaining the electricity of the first DC side input capacitance and the second DC side input capacitance Pressure value；First judge module, for judging whether the magnitude of voltage is more than the first predetermined threshold value, if it is, the control initial electricity Flat circuit of establishing stops charging for the flying capacitor, and controls the multi-level circuit to be in chop control state, to reduce The bus mid-point voltage.
- 6. mid-point voltage control device according to claim 5, it is characterised in that also include：Second acquisition module, for obtaining the electricity of the first DC side input capacitance and the second DC side input capacitance Pressure value；Second judge module, for judging whether the magnitude of voltage is less than the first predetermined threshold value, if it is, the control initial electricity Flat circuit of establishing charges for the flying capacitor, and stops controlling the multi-level circuit to be in chop control state.
- 7. mid-point voltage control device according to claim 6, it is characterised in that also include：3rd acquisition module, for obtaining the magnitude of voltage of the flying capacitor；3rd judge module, for judging whether the magnitude of voltage of the flying capacitor is more than default original levels, if it is, control The original levels establish circuit and stop charging for the flying capacitor.
- 8. mid-point voltage control device according to claim 7, it is characterised in that the chop control state be by except Path and the LC wave filters outside the flying capacitor carry out bus neutral balance control to the bus mid-point voltage.
- 9. a kind of photovoltaic generating system, it is characterised in that including the mid-point voltage control as described in any one in claim 5-8 Device processed.
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